Home » Public Forums » GMCnet » Proper/Optimal fuel grade for GMC
| Proper/Optimal fuel grade for GMC [message #357928] |
Sat, 22 August 2020 00:16  |
NextGenGMC
Messages: 146
Registered: December 2017
Location: Washington State
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Hello All,
Just wondering what is the proper fuel grade to use on our GMCs. My understanding is that the 455 engine was originally built/tuned to run on high octane leaded fuel. What is a proper grade of modern fuel to use on these engines? I'm referring to the gasoline which likely have Ethanol added to it, i.e. plain regular vanilla variety gas station fuel. In my area there is no Ethanol free gas available, unless I go and siphon some from the airplanes at the local airport  Let me know what you all fill up with.
Thanks.
Vadim Jitkov
'76 Glenbrook 26'
Pullman, WA
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| Re: [GMCnet] Proper/Optimal fuel grade for GMC [message #357931 is a reply to message #357929] |
Sat, 22 August 2020 08:34  |
stu@97381.com, Emery
Messages: 232
Registered: June 2020
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Emery
> On Aug 21, 2020, at 11:23 PM, James Hupy via Gmclist wrote:
>
> Chevron 87 octane swill gas. (Alcohol) or Top tier Costco 87 octane
> regular. Buy from a busy station on major routes. Not some backwater
> station. Fresher is better than aging on gasoline.
> Jim Hupy
> Salem, Oregon
>
>> On Fri, Aug 21, 2020, 10:17 PM Vadim Jitkov via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>> Hello All,
>> Just wondering what is the proper fuel grade to use on our GMCs. My
>> understanding is that the 455 engine was originally built/tuned to run on
>> high
>> octane leaded fuel. What is a proper grade of modern fuel to use on these
>> engines? I'm referring to the gasoline which likely have Ethanol added to
>> it, i.e. plain regular vanilla variety gas station fuel. In my area there
>> is no Ethanol free gas available, unless I go and siphon some from the
>> airplanes at the local airport :d Let me know what you all fill up with.
>> Thanks.
>> --
>> Vadim Jitkov
>> '76 Glenbrook 26'
>> Pullman, WA
>>
>> __________
Vadim
There are different ways to measure the Octane rating of gasoline. The Research Method and the Motor Method. There are even more methods but these are currently used. When the GMC Motorhomes were built the Research method was used. The Owners manual Octane requirement was based on this. And, the gasoline pumps showed that number. This is about 8 points higher than the Motor Method. Some time after the manuals were printed (I don’t remember the year) gasoline producers changed their published Octane number to the average of the two methods. On the gasoline pumps there is a yellow sticker that shows the Octane number and reads (R + M) /2. (The average of the two methods).
So an Octane rating of 87 used to be listed as 91.
It is the same fuel it is just the method of measuring the Octane . So it is just fine to burn 87 Octane (Regular) in your GMC.
You can find a lot of information about this on the Internet.
Emery Stora
77 Kingsley
Frederick CO
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| Re: [GMCnet] Proper/Optimal fuel grade for GMC [message #357932 is a reply to message #357929] |
Sat, 22 August 2020 08:41 |
powwerjon
Messages: 849
Registered: March 2013
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Back when the GMC was built the formulations of gasoline were much more robust. Todays gasoline is somewhat less, with the addition of ethanol (10% +/-) to the gas and it is true that the 10% addition of ethanol results in a drop in fuel mileage. I have driven almost 110K miles over the last 20 year and noticed the different. Out West you can find more gas station that sell “Real” gas without the added ethanol and would sometime run it when we were going into the mountains, but be careful a lot of rural gas station sell an 85 octane Farm Gas. You do not want to buy that! You can find “Real Gas” at boat marinas and at some gas station that are around lakes and waterways but expect to pay a premium for it. My brother on occasion used to use regular pump gas in his boat, but found out that was not a good idea. The ethanol is hydroscopic and absorbs water and because of that he had his fuel filters plug up and fill with water. Do a search for “real gas near me” and you will find a listing of gas station that do carry ethanol free gas.
Back to what grade you can run? 87 octane is the correct for you GMC and will run without issues. If gasoline gets down on price I sometimes put some Mid-grade, typically 89 octane.
Believe what Jim H says on backwater gas station and only buy a high volume stations. One other thing is if a stations tanks are low you could possibly get some water and trash that will play havoc with your fuel filters. When most station stick their tanks for level that also have a chemical that indicates possible water at the bottom of their tanks, this is typical with low volume stations. The stations in tank pumps do not pick the fuel up at the bottom of the tanks. The newer tank systems have a water sensor installed along with electronic level gauges.
Regards,
J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan
> On Aug 22, 2020, at 1:22 AM, James Hupy via Gmclist wrote:
>
> Chevron 87 octane swill gas. (Alcohol) or Top tier Costco 87 octane
> regular. Buy from a busy station on major routes. Not some backwater
> station. Fresher is better than aging on gasoline.
> Jim Hupy
> Salem, Oregon
>
> On Fri, Aug 21, 2020, 10:17 PM Vadim Jitkov via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Hello All,
>> Just wondering what is the proper fuel grade to use on our GMCs. My
>> understanding is that the 455 engine was originally built/tuned to run on
>> high
>> octane leaded fuel. What is a proper grade of modern fuel to use on these
>> engines? I'm referring to the gasoline which likely have Ethanol added to
>> it, i.e. plain regular vanilla variety gas station fuel. In my area there
>> is no Ethanol free gas available, unless I go and siphon some from the
>> airplanes at the local airport :d Let me know what you all fill up with.
>> Thanks.
>> --
>> Vadim Jitkov
>> '76 Glenbrook 26'
>> Pullman, WA
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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> _______________________________________________
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| Re: Proper/Optimal fuel grade for GMC [message #357935 is a reply to message #357928] |
Sat, 22 August 2020 10:08 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
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I have found the quest for ethanol free gas to be a complete waste of time. E10 87 is fine at sea level or moderate altitudes. If you travel out west to the mountains you will find 86 and 85 octane due to thinner air effectively lowering the cylinder pressure when compressed. Everyone poo poo’s ethanol but it is a great antiknock agent as it has an octane rating of about 113 and smooths the burn process. It replaced other toxic anitknock chemicals, which is good. I find I can run more timing than with pure gas, recovering most of the mileage from the lower calorie content of E10
John Lebetski
Woodstock, IL
77 Eleganza II
[Updated on: Sat, 22 August 2020 10:14] Report message to a moderator |
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| Re: [GMCnet] Proper/Optimal fuel grade for GMC [message #357941 is a reply to message #357931] |
Sat, 22 August 2020 11:12 |
NextGenGMC
Messages: 146
Registered: December 2017
Location: Washington State
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stu@97381.com, Emery wrote on Sat, 22 August 2020 06:34
So an Octane rating of 87 used to be listed as 91.
It is the same fuel it is just the method of measuring the Octane . So it is just fine to burn 87 Octane (Regular) in your GMC.
This clarifies things. I was wrongly thinking that it was the other way around - what used to be lower octane rating is now listed under higher (premium). I'm glad to be wrong on this one and it puts my mind to rest. Just use fresh fuel and make sure to add some Sta-Bil to the tanks before storage for prolonged time.
Appreciate clarification.
Vadim Jitkov
'76 Glenbrook 26'
Pullman, WA
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| Re: [GMCnet] Proper/Optimal fuel grade for GMC [message #357952 is a reply to message #357944] |
Sat, 22 August 2020 13:34 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
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Octane varies from elevation. Higher, the air is less dense so the rating
can go down to 85 at places.
On Sat, Aug 22, 2020 at 9:31 AM John Wright via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Just a short comment, the addition of Sta-bil to your fuel system at last
> fill up before storage. A lot of you store your coaches during the winter
> months and this will help the gasoline.
>
> JR Wright
> Michigan
>> On Aug 22, 2020, at 12:12 PM, Vadim Jitkov via Gmclist gmclist@list.gmcnet.org> wrote:
>>
>> stu@97381.com, Emery wrote on Sat, 22 August 2020 06:34
>>> So an Octane rating of 87 used to be listed as 91.
>>> It is the same fuel it is just the method of measuring the Octane . So
> it is just fine to burn 87 Octane (Regular) in your GMC.
>>
>> This clarifies things. I was wrongly thinking that it was the other way
> around - what used to be lower octane rating is now listed under higher
>> (premium). I'm glad to be wrong on this one and it puts my mind to
> rest. Just use fresh fuel and make sure to add some Sta-Bil to the tanks
> before
>> storage for prolonged time.
>> Appreciate clarification.
>> --
>> Vadim Jitkov
>> '76 Glenbrook 26'
>> Pullman, WA
>>
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>> GMCnet mailing list
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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www.appliedgmc.com
1-800-752-7502
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| Re: Proper/Optimal fuel grade for GMC [message #357955 is a reply to message #357928] |
Sat, 22 August 2020 17:38 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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Vadin,
Unless your engine has been seriously modified, it will run just fine on 87 pump octane.
I have had cars that really cared and let me assure you, if you got it wrong they let you know.
Recently, I finished a major on my engine and I did the clearance volume measurement to verify that it was 8.5. As built, the coach engines were a little less than that because they had more dish in the piston, but they also had a steel shim head gasket, and that thickness matters in the final compression volume.
The pump number is RON+MON/2. If I felt like staying at the keyboard that long, I could explain the difference and why the current advertised is a good thing, but not today.
What I do think is interesting is that I knew from the years of engine testing that I did that alcohol in motor fuel does not good for anything except the alcohol market. If an engine is somewhat out of tune, it may help the final emissions a little. If it is in proper tune, there is no measurable improvement. What is also interesting to me, is that it has a negative effect on fuel economy that pretty much matches the ethanol concentration. When we started traveling with the coach, I would sample and record every fill up and since any fill up was within a few gallons of fifty, things were pretty stable. In short, the coach treated the ethanol as a useless filler. As it was all 87 pump, even correcting the timing (easier on my coach than most) for that tank, did not make a repeatable difference.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Proper/Optimal fuel grade for GMC [message #357956 is a reply to message #357952] |
Sat, 22 August 2020 17:52 |
Fipp
Messages: 26
Registered: December 2017
Location: Aledo, Illinois
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I agree with Jim Hupy, when I bought my Royale a few years ago, I was warned to use Ethanol free gas and I have METICULOUSLY followed those instructions to this day. Too my knowledge, no ethanol has ever been added to it. My 455 runs like a top, I am lucky to have a regional supplier locally that delivers non ethanol gas to gas stations. I use an app called "Pure Gas" which I find to be helpful when we are away from our area. I realize its more money but thats inconsequential to me given the fact that I believe ethanol causes problems.... just sayin.
Scott D. Fippinger
Aledo, Illinois
1976 Royale
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| Re: [GMCnet] Proper/Optimal fuel grade for GMC [message #357963 is a reply to message #357956] |
Sun, 23 August 2020 08:31 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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Fipp wrote on Sat, 22 August 2020 18:52I agree with Jim Hupy, when I bought my Royale a few years ago, I was warned to use Ethanol free gas and I have METICULOUSLY followed those instructions to this day. Too my knowledge, no ethanol has ever been added to it. My 455 runs like a top, I am lucky to have a regional supplier locally that delivers non ethanol gas to gas stations. I use an app called "Pure Gas" which I find to be helpful when we are away from our area. I realize its more money but thats inconsequential to me given the fact that I believe ethanol causes problems.... just sayin.
Scott,
While that is laudable effort, if one travels very far in a year, trying to locate ethanol free fuel within your tank range can be a real challenge. While Michigan is easy this way because of the ag demand and plentiful marinas that is not always the case.
It is not really that difficult to make the fuel system alcohol tolerant. Granted it took me more tries than it should have, but that was finally complete about 10 years ago and it has not been an issue since.
What should be noted is that when anything is done to the fuel system, the correct materials and parts are used. This is not all that difficult. Carburetor kits all contain the correct materials. New fuel pumps are tolerant. If barrier hose is used for the flexible parts, you have that covered. My fuel sending units went bad, but that was mostly corrosion from a lack of use by the PO.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Proper/Optimal fuel grade for GMC [message #357964 is a reply to message #357928] |
Sun, 23 August 2020 08:53 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
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Leaving the Amana rally the gas station and country store just outside the fair grounds had pure gas so I filled up for the ride home. No improved performance, in fact light tip in pinging and flat spot that was never there and since has not come back on E10 from totally random sources during travels.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Proper/Optimal fuel grade for GMC [message #357968 is a reply to message #357928] |
Sun, 23 August 2020 09:57 |
6cuda6
Messages: 975
Registered: June 2019
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I agree with JimH....ethanol blended fuel is crap. It is true that alcohol fuel makes good power but it requires 2 times more per volume to make it compared to gasoline so by adding 10% ethynol to gas all your doing is watering it down really.....does it work to reduce knock....i think a qualified answer may come from Matt but in my experience one has to change the motor adjustments (mixture, spark timing, compression etc) to be able to make it work properly. The GMC motor stock is a pretty lame beast when we look at compression ratios, timing etc so it runs well on todays crap fuels.....put some real timing numbers into it and see how bad the fuel really is. JMHO
Rich Mondor,
Brockville, ON
77 Hughes 2600
[Updated on: Sun, 23 August 2020 09:58] Report message to a moderator |
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| Re: [GMCnet] Proper/Optimal fuel grade for GMC [message #357971 is a reply to message #357968] |
Sun, 23 August 2020 12:56 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Some of you are too young to have lived through the 50's, and never lusted
after cars that didn't look like Camry's, which I compare to refrigerators
more than cars. We couldn't wait to turn 15 so we could get my driver's
permit.
It was a very special period in our American Automakers history,
starting with the high compression Oldsmobiles and Cadillacs and early
Chrysler Hemi's.
Gasoline blenders had to keep pace with changes in compression ratios
by creating Ethyl or Premium fuels. You could drive up to a CHEVRON white
pump and pump in some 105 octane tetra-ethyl fuel. That worked peachy keen
in 10.5 to 1 compression ratio engines.
That gasoline did make a huge difference in how they ran. You could
bump up the ignition timing, change the advance curves in the distributor
and make em run right.
About this time, I moved to Seattle, made friends with a guy whose
father belonged to the Seattle Yacht Club. The club sponsored Unlimited
Hydroplanes known as the SLO-MO-SHUN boats. They were powered by airplane
engines most notably the Allison and the engines from the British Spitfire
fighter, the Rolls Royce Merlin. They burned high test aviation fuels as
high an octane as 120. That stuff smelled wonderful to a 16 year old engine
nut. Through my friends father, we gained access to the pits during the
Gold Cup races on lake Washington. Just hearing those unmuffled aircraft
engines up close and smelling the exhaust was an experience I carry with me
to this day. Absolutely loved it. Still do. So, that's my perspective on
what came later. Sad days ahead, my friends. Cookie cutter cars, no lead
fuels. Nuff said.
Jim Hupy
Salem, Oregon
On Sun, Aug 23, 2020, 7:57 AM 6cuda6--- via Gmclist
wrote:
> I agree with JimH....ethanol blended fuel is crap. It is true that alcohol
> fuel makes good power but it requires 2 times more per volume to make it
> compared to gasoline so by adding 10% ethynol to gas all your doing is
> watering it down really.....does it work to reduce knock....i think a
> qualified
> answer may come from Matt but in my experience one has to change the motor
> adjustments (mixture, spark timing, compression etc) to be able to make it
> work properly. The GMC motor stock is a pretty lame beast when we look at
> compression ratios, timing etc so it runs well on todays crap fuels.....lut
> some timing into it and see how bad the fuel really is. JMHO
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Proper/Optimal fuel grade for GMC [message #357981 is a reply to message #357971] |
Sun, 23 August 2020 16:12 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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I cross the country at least twic a year and more.
I feel it is a waste of time and worry thinking about the blend.
Yes you can run in to some poor blend, but just burn it off as the next
tank will possibly good.
Same goes for Carburetors, if in good shape you will not have issues . I
know as I run a stock Carb on my 403 Kingsly.
Yes I have electric pump.
On Sun, Aug 23, 2020 at 10:57 AM James Hupy via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Some of you are too young to have lived through the 50's, and never lusted
> after cars that didn't look like Camry's, which I compare to refrigerators
> more than cars. We couldn't wait to turn 15 so we could get my driver's
> permit.
> It was a very special period in our American Automakers history,
> starting with the high compression Oldsmobiles and Cadillacs and early
> Chrysler Hemi's.
> Gasoline blenders had to keep pace with changes in compression ratios
> by creating Ethyl or Premium fuels. You could drive up to a CHEVRON white
> pump and pump in some 105 octane tetra-ethyl fuel. That worked peachy keen
> in 10.5 to 1 compression ratio engines.
> That gasoline did make a huge difference in how they ran. You could
> bump up the ignition timing, change the advance curves in the distributor
> and make em run right.
> About this time, I moved to Seattle, made friends with a guy whose
> father belonged to the Seattle Yacht Club. The club sponsored Unlimited
> Hydroplanes known as the SLO-MO-SHUN boats. They were powered by airplane
> engines most notably the Allison and the engines from the British Spitfire
> fighter, the Rolls Royce Merlin. They burned high test aviation fuels as
> high an octane as 120. That stuff smelled wonderful to a 16 year old engine
> nut. Through my friends father, we gained access to the pits during the
> Gold Cup races on lake Washington. Just hearing those unmuffled aircraft
> engines up close and smelling the exhaust was an experience I carry with me
> to this day. Absolutely loved it. Still do. So, that's my perspective on
> what came later. Sad days ahead, my friends. Cookie cutter cars, no lead
> fuels. Nuff said.
> Jim Hupy
> Salem, Oregon
>
> On Sun, Aug 23, 2020, 7:57 AM 6cuda6--- via Gmclist gmclist@list.gmcnet.org>
> wrote:
>
>> I agree with JimH....ethanol blended fuel is crap. It is true that
> alcohol
>> fuel makes good power but it requires 2 times more per volume to make it
>> compared to gasoline so by adding 10% ethynol to gas all your doing is
>> watering it down really.....does it work to reduce knock....i think a
>> qualified
>> answer may come from Matt but in my experience one has to change the
> motor
>> adjustments (mixture, spark timing, compression etc) to be able to make
> it
>> work properly. The GMC motor stock is a pretty lame beast when we look at
>> compression ratios, timing etc so it runs well on todays crap
> fuels.....lut
>> some timing into it and see how bad the fuel really is. JMHO
>> --
>> Rich Mondor,
>>
>> Brockville, ON
>>
>> 77 Hughes 2600
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Proper/Optimal fuel grade for GMC [message #357999 is a reply to message #357928] |
Mon, 24 August 2020 08:01 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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" E10 87 is fine at sea level or moderate altitudes" I'd modify that to 'except in the Southeast in July and August' without a push pump in back. The symptom is, the engine quits when you stop at the bottom of the freeway off ramp. There you sit till things cool down. 'Boat gas' is easily found in the Southeast, not so much out West. Look at pure-gas.org for locations by state. I note, in my Kia and Town n Country pure gas gives a bit better mileage, albeit not enough to make the cost difference. My 23' was box stock, I always ran it on pure gas. My 26' has injection, so I run whatever's there. When it comes home to sit a bit, I fill it with pure gas. JimH, we used to run up to Guntersville back then and watch the Unlimiteds every year. The slo-mo-shuns and everybody else usually got shut down by the various Miss Budweisers. The recips were way more fun to watch than the current whistle-boats, even though they're slower.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Proper/Optimal fuel grade for GMC [message #358006 is a reply to message #357999] |
Mon, 24 August 2020 09:59 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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That's why we don't use reciprocating engines in fighter aircraft anymore.
We tried that in Korea vs Mig 15's. Didn't work.
Those jet hydroplanes are generations ahead of those old piston
powered boats. But, one fact still remains true. Those hand built hulls
were works of art with all that teak and mahogany. The fiberglass hulls do
not come close to beautiful, some of the hand laidup carbon fiber boats are
kinda neat.
Those early jet powered boats were on the order of twice as expensive
to build, though, and when they injested a snootful of water, bad stuff
happened.
But, you can't out race cubic money.
Jim Hupy
Salem, Oregon
On Mon, Aug 24, 2020, 6:03 AM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> " E10 87 is fine at sea level or moderate altitudes" I'd modify that to
> 'except in the Southeast in July and August' without a push pump in back.
> The symptom is, the engine quits when you stop at the bottom of the
> freeway off ramp. There you sit till things cool down. 'Boat gas' is
> easily
> found in the Southeast, not so much out West. Look at pure-gas.org for
> locations by state. I note, in my Kia and Town n Country pure gas gives a
> bit
> better mileage, albeit not enough to make the cost difference. My 23' was
> box stock, I always ran it on pure gas. My 26' has injection, so I run
> whatever's there. When it comes home to sit a bit, I fill it with pure
> gas. JimH, we used to run up to Guntersville back then and watch the
> Unlimiteds every year. The slo-mo-shuns and everybody else usually got
> shut down by the various Miss Budweisers. The recips were way more fun to
> watch than the current whistle-boats, even though they're slower.
>
> --johnny
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> I forgive them all, save those who hurt the dogs. They must answer to me
> in hell
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] Proper/Optimal fuel grade for GMC [message #358009 is a reply to message #358006] |
Mon, 24 August 2020 11:14 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
|
Senior Member |
|
|
Coolest place i've ever been is the Hydroplane Museum in Seattle....got a one on one tour plus got to hang out in the back to watch a group of guys working on one....very special!!
Nitromethane...top fuel dragsters/funny cars....time in Burnsteins pits with the engine guys at Maple Grove Winter Nationals....now that was incredible!!!
James Hupy wrote on Mon, 24 August 2020 10:59That's why we don't use reciprocating engines in fighter aircraft anymore.
We tried that in Korea vs Mig 15's. Didn't work.
Those jet hydroplanes are generations ahead of those old piston
powered boats. But, one fact still remains true. Those hand built hulls
were works of art with all that teak and mahogany. The fiberglass hulls do
not come close to beautiful, some of the hand laidup carbon fiber boats are
kinda neat.
Those early jet powered boats were on the order of twice as expensive
to build, though, and when they injested a snootful of water, bad stuff
happened.
But, you can't out race cubic money.
Jim Hupy
Salem, Oregon
On Mon, Aug 24, 2020, 6:03 AM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> " E10 87 is fine at sea level or moderate altitudes" I'd modify that to
> 'except in the Southeast in July and August' without a push pump in back.
> The symptom is, the engine quits when you stop at the bottom of the
> freeway off ramp. There you sit till things cool down. 'Boat gas' is
> easily
> found in the Southeast, not so much out West. Look at pure-gas.org for
> locations by state. I note, in my Kia and Town n Country pure gas gives a
> bit
> better mileage, albeit not enough to make the cost difference. My 23' was
> box stock, I always ran it on pure gas. My 26' has injection, so I run
> whatever's there. When it comes home to sit a bit, I fill it with pure
> gas. JimH, we used to run up to Guntersville back then and watch the
> Unlimiteds every year. The slo-mo-shuns and everybody else usually got
> shut down by the various Miss Budweisers. The recips were way more fun to
> watch than the current whistle-boats, even though they're slower.
>
> --johnny
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> I forgive them all, save those who hurt the dogs. They must answer to me
> in hell
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
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Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: [GMCnet] Proper/Optimal fuel grade for GMC [message #358011 is a reply to message #358009] |
Mon, 24 August 2020 11:23 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
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Garlits said it best, I think. Gasoline goes in the tow truck, Alcohol
mixes with ice and goes in the driver, Nitromethane goes in the race car.
The fumes from that stuff are addictive. Ask me how I know over an adult
beverage sometime.
Jim Hupy
Salem, Oregon
On Mon, Aug 24, 2020, 9:15 AM 6cuda6--- via Gmclist
wrote:
> Coolest place i've ever been is the Hydroplane Museum in Seattle....got a
> one on one tour plus got to hang out in the back to watch a group of guys
> working on one....very special!!
>
> Nitromethane...top fuel dragsters/funny cars....time in Burnsteins pits
> with the engine guys at Maple Grove Winter Nationals....now that was
> incredible!!!
>
> James Hupy wrote on Mon, 24 August 2020 10:59
>> That's why we don't use reciprocating engines in fighter aircraft
> anymore.
>> We tried that in Korea vs Mig 15's. Didn't work.
>> Those jet hydroplanes are generations ahead of those old piston
>> powered boats. But, one fact still remains true. Those hand built hulls
>> were works of art with all that teak and mahogany. The fiberglass hulls
> do
>> not come close to beautiful, some of the hand laidup carbon fiber boats
> are
>> kinda neat.
>> Those early jet powered boats were on the order of twice as
> expensive
>> to build, though, and when they injested a snootful of water, bad stuff
>> happened.
>> But, you can't out race cubic money.
>> Jim Hupy
>> Salem, Oregon
>>
>> On Mon, Aug 24, 2020, 6:03 AM Johnny Bridges via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> " E10 87 is fine at sea level or moderate altitudes" I'd modify that
> to
>>> 'except in the Southeast in July and August' without a push pump in
> back.
>>> The symptom is, the engine quits when you stop at the bottom of the
>>> freeway off ramp. There you sit till things cool down. 'Boat gas'
> is
>>> easily
>>> found in the Southeast, not so much out West. Look at pure-gas.org
> for
>>> locations by state. I note, in my Kia and Town n Country pure gas
> gives a
>>> bit
>>> better mileage, albeit not enough to make the cost difference. My
> 23' was
>>> box stock, I always ran it on pure gas. My 26' has injection, so I
> run
>>> whatever's there. When it comes home to sit a bit, I fill it with
> pure
>>> gas. JimH, we used to run up to Guntersville back then and watch the
>>> Unlimiteds every year. The slo-mo-shuns and everybody else usually
> got
>>> shut down by the various Miss Budweisers. The recips were way more
> fun to
>>> watch than the current whistle-boats, even though they're slower.
>>>
>>> --johnny
>>> --
>>> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
>>> Braselton, Ga.
>>> I forgive them all, save those who hurt the dogs. They must answer
> to me
>>> in hell
>>>
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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