Home » Public Forums » GMCnet » [GMCnet] Oil Usage Issue
| [GMCnet] Oil Usage Issue [message #259402] |
Tue, 19 August 2014 21:11  |
Arthur Mansfield
Messages: 290
Registered: April 2010
Karma: 0
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I just got back from about a 2k trip. My oil consumption was ok most of the time. If I had to pull a serious grade I would drop 2 quarts of oil real fast. 50 miles after it checked full at the fill up I was down 2 quarts when I parked for the nite. On another leg on I 81 in Virgin were I pulled some long grades and ran it hard holding speed all the way up the grades, when I stopped I was 2 quarts low again. On the last 400 miles I ran easy on the few hills I did not use any oil. It was still at the same mark as when I had refilled it after I added the 2 quarts. I hate the problems that seem to come and go depending on how you drive. Anyone have any idea as to what the problem might be.
I drive at 65 and pull a GEO Tracker. I use 20 50 oil and the engine has about 15k on it since it was rebuilt. The oil pressure reads 40 psi and did not change when I lost the oil. When I lost the oil I was running up the hills with Q jet secondaries open and vacuum reading near zero. On the early leg I dropped to 45 mph and shifted into second gear for a while and pushed it to 50 mph before shifting back to high. Stock rear end ratio on my RV.
Art & Doris
76 EL
Decatur AL
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| Re: [GMCnet] Oil Usage Issue [message #259411 is a reply to message #259402] |
Tue, 19 August 2014 22:38  |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Arthur Mansfield wrote on Tue, 19 August 2014 20:11I just got back from about a 2k trip. My oil consumption was ok most of the time. If I had to pull a serious grade I would drop 2 quarts of oil real fast. 50 miles after it checked full at the fill up I was down 2 quarts when I parked for the nite. On another leg on I 81 in Virgin were I pulled some long grades and ran it hard holding speed all the way up the grades, when I stopped I was 2 quarts low again. On the last 400 miles I ran easy on the few hills I did not use any oil. It was still at the same mark as when I had refilled it after I added the 2 quarts. I hate the problems that seem to come and go depending on how you drive. Anyone have any idea as to what the problem might be.
I drive at 65 and pull a GEO Tracker. I use 20 50 oil and the engine has about 15k on it since it was rebuilt. The oil pressure reads 40 psi and did not change when I lost the oil. When I lost the oil I was running up the hills with Q jet secondaries open and vacuum reading near zero. On the early leg I dropped to 45 mph and shifted into second gear for a while and pushed it to 50 mph before shifting back to high. Stock rear end ratio on my RV.
Art & Doris
76 EL
Decatur AL
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Art--one possibility is that when you climb, you also go down at some point. Worn valve seals can suck a lot of oil going downhill. They are very easy to replace with the engine in the coach and may be worth a try with very low cost and effort.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Oil Usage Issue [message #259415 is a reply to message #259411] |
Tue, 19 August 2014 23:21 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Replace the PCV valve. It is a $5.00 and 5 minute fix. That might not be it but you are not out much trying it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Oil Usage Issue [message #259417 is a reply to message #259402] |
Tue, 19 August 2014 23:29 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
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Not sure what is going on,but you might run the engine oil level one quart
lo and e if that will resolve some of your usage.
Majority of the coaches run on full mark and blow out the first quart
rapidly.
On Tue, Aug 19, 2014 at 7:11 PM, 1104agm wrote:
> I just got back from about a 2k trip. My oil consumption was ok most of
> the time. If I had to pull a serious grade I would drop 2 quarts of oil
> real fast. 50 miles after it checked full at the fill up I was down 2
> quarts when I parked for the nite. On another leg on I 81 in Virgin were I
> pulled some long grades and ran it hard holding speed all the way up the
> grades, when I stopped I was 2 quarts low again. On the last 400 miles I
> ran easy on the few hills I did not use any oil. It was still at the same
> mark as when I had refilled it after I added the 2 quarts. I hate the
> problems that seem to come and go depending on how you drive. Anyone have
> any idea as to what the problem might be.
>
> I drive at 65 and pull a GEO Tracker. I use 20 50 oil and the engine has
> about 15k on it since it was rebuilt. The oil pressure reads 40 psi and
> did not change when I lost the oil. When I lost the oil I was running up
> the hills with Q jet secondaries open and vacuum reading near zero. On the
> early leg I dropped to 45 mph and shifted into second gear for a while and
> pushed it to 50 mph before shifting back to high. Stock rear end ratio on
> my RV.
>
> Art & Doris
> 76 EL
> Decatur AL
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Oil Usage Issue [message #259420 is a reply to message #259402] |
Tue, 19 August 2014 23:47 |
cbryan
Messages: 451
Registered: May 2012
Location: Ennis, Texas
Karma: 3
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Arthur Mansfield wrote on Tue, 19 August 2014 21:11I just got back from about a 2k trip. My oil consumption was ok most of the time. If I had to pull a serious grade I would drop 2 quarts of oil real fast. 50 miles after it checked full at the fill up I was down 2 quarts when I parked for the nite. On another leg on I 81 in Virgin were I pulled some long grades and ran it hard holding speed all the way up the grades, when I stopped I was 2 quarts low again. On the last 400 miles I ran easy on the few hills I did not use any oil. It was still at the same mark as when I had refilled it after I added the 2 quarts. I hate the problems that seem to come and go depending on how you drive. Anyone have any idea as to what the problem might be.
I drive at 65 and pull a GEO Tracker. I use 20 50 oil and the engine has about 15k on it since it was rebuilt. The oil pressure reads 40 psi and did not change when I lost the oil. When I lost the oil I was running up the hills with Q jet secondaries open and vacuum reading near zero. On the early leg I dropped to 45 mph and shifted into second gear for a while and pushed it to 50 mph before shifting back to high. Stock rear end ratio on my RV.
Art & Doris
76 EL
Decatur AL
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Art, I'm not sure about this, others may be better at it. I have noticed that one of our vehicle fleet uses oil when low on coolant, not enough to cause overheating, but it goes from no oil consumption to quite a lot. Maybe do an oxalic acid flush, neutralize the system with sodium carbonate, replace the thermostat, use 180 degree thermostat, make sure the cooling system is in top shape, cooling fan works fine, it isn't overheating at any time.
Otherwise, maybe something like the valve covers may be from a Toronado engine with excessive oil feed through into the PVC system and sucks blowby oil through the crankcase ventilation system, not through the PCV valve. Check the gauze filter in the air cleaner from the valve cover and see if it is soaked with oil. Maybe a PCV valve stuck open, but not likely. If it rattles it's probably OK.
Good luck with this. It's a prescription for disaster to be pulling hard with low oil in a 455, I think.
Best,
Carey
Carey from Ennis, Texas
78 Royale, 500 Cadillac, Rance Baxter EFI.
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| Re: [GMCnet] Oil Usage Issue [message #259421 is a reply to message #259415] |
Wed, 20 August 2014 00:52 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Ken Burton wrote on Tue, 19 August 2014 21:21Replace the PCV valve. It is a $5.00 and 5 minute fix. That might not be it but you are not out much trying it.
Good idea, and while you are at it, pull the hose at the carburetor and see if it has oil in it.
Wide Open Throttle (WOT) will increase blow-by and cause reduced PCV suction. This will cause pressure to build in the crankcase. The only exit is the breather on the left valve cover. It was suggested to check where it goes into the air cleaner to see if it is burping oil at WOT.
When loafing, the engine normally has negative pressure in the crankcase. WOT causes positive pressure. Look closely at the front and back of the engine at the "china wall" where the intake manifold rests against the block. Crankcase vacuum with suck any oil trying to escape into the engine. A leak there will be pronounced when there is positive pressure.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] Oil Usage Issue [message #259457 is a reply to message #259417] |
Wed, 20 August 2014 10:42 |
Arthur Mansfield
Messages: 290
Registered: April 2010
Karma: 0
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Senior Member |
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Thanks JIm. I already run a quart low. Any other ideas.
On Aug 19, 2014, at 11:29 PM, Jim Kanomata wrote:
> Not sure what is going on,but you might run the engine oil level one quart
> lo and e if that will resolve some of your usage.
> Majority of the coaches run on full mark and blow out the first quart
> rapidly.
>
>
>
> On Tue, Aug 19, 2014 at 7:11 PM, 1104agm wrote:
>
>> I just got back from about a 2k trip. My oil consumption was ok most of
>> the time. If I had to pull a serious grade I would drop 2 quarts of oil
>> real fast. 50 miles after it checked full at the fill up I was down 2
>> quarts when I parked for the nite. On another leg on I 81 in Virgin were I
>> pulled some long grades and ran it hard holding speed all the way up the
>> grades, when I stopped I was 2 quarts low again. On the last 400 miles I
>> ran easy on the few hills I did not use any oil. It was still at the same
>> mark as when I had refilled it after I added the 2 quarts. I hate the
>> problems that seem to come and go depending on how you drive. Anyone have
>> any idea as to what the problem might be.
>>
>> I drive at 65 and pull a GEO Tracker. I use 20 50 oil and the engine has
>> about 15k on it since it was rebuilt. The oil pressure reads 40 psi and
>> did not change when I lost the oil. When I lost the oil I was running up
>> the hills with Q jet secondaries open and vacuum reading near zero. On the
>> early leg I dropped to 45 mph and shifted into second gear for a while and
>> pushed it to 50 mph before shifting back to high. Stock rear end ratio on
>> my RV.
>>
>> Art & Doris
>> 76 EL
>> Decatur AL
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Fremont,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Oil Usage Issue [message #259459 is a reply to message #259457] |
Wed, 20 August 2014 10:59 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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High oil consumption under periods of heavy throttle are usually an
indicator of poor fit on pistons, or rings that are not seated. If original
pistons were used in worn bores that were cross hatched but slightly out of
round or tapered, this could be a cause. Perhaps another cause might be
worn ring lands on the pistons. I don't know what kind of a rebuild you
have, so I am just throwing out possible conditions that MIGHT exist. Worn
valve guides will usually use oil at a consistent rate, and are more likely
to use oil on closed throttle, higher rpm use like long downgrades. Two
different sets of conditions. One heavy piston loading, with fairly wide
open throttle. The other one is light piston loading, closed throttle, high
engine vacuum. Another cause might be a cracked intake manifold or poorly
fitted one. A cylinder balance test using shop air should uncover the
culprit. Lacking the proper tools for a cylinder balance test, a wet/dry
standard compression test will shed some light on your problems as well.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Wed, Aug 20, 2014 at 8:42 AM, 1104agm wrote:
> Thanks JIm. I already run a quart low. Any other ideas.
>
> On Aug 19, 2014, at 11:29 PM, Jim Kanomata wrote:
>
>> Not sure what is going on,but you might run the engine oil level one
> quart
>> lo and e if that will resolve some of your usage.
>> Majority of the coaches run on full mark and blow out the first quart
>> rapidly.
>>
>>
>>
>> On Tue, Aug 19, 2014 at 7:11 PM, 1104agm wrote:
>>
>>> I just got back from about a 2k trip. My oil consumption was ok most of
>>> the time. If I had to pull a serious grade I would drop 2 quarts of oil
>>> real fast. 50 miles after it checked full at the fill up I was down 2
>>> quarts when I parked for the nite. On another leg on I 81 in Virgin
> were I
>>> pulled some long grades and ran it hard holding speed all the way up the
>>> grades, when I stopped I was 2 quarts low again. On the last 400 miles
> I
>>> ran easy on the few hills I did not use any oil. It was still at the
> same
>>> mark as when I had refilled it after I added the 2 quarts. I hate the
>>> problems that seem to come and go depending on how you drive. Anyone
> have
>>> any idea as to what the problem might be.
>>>
>>> I drive at 65 and pull a GEO Tracker. I use 20 50 oil and the engine
> has
>>> about 15k on it since it was rebuilt. The oil pressure reads 40 psi and
>>> did not change when I lost the oil. When I lost the oil I was running
> up
>>> the hills with Q jet secondaries open and vacuum reading near zero. On
> the
>>> early leg I dropped to 45 mph and shifted into second gear for a while
> and
>>> pushed it to 50 mph before shifting back to high. Stock rear end ratio
> on
>>> my RV.
>>>
>>> Art & Doris
>>> 76 EL
>>> Decatur AL
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>
>>
>>
>>
>> --
>> Jim Kanomata
>> Applied/GMC, Fremont,CA
>> jimk@appliedairfilters.com
>> http://www.appliedgmc.com
>> 1-800-752-7502
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
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> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Oil Usage Issue [message #259467 is a reply to message #259459] |
Wed, 20 August 2014 11:40 |
Arthur Mansfield
Messages: 290
Registered: April 2010
Karma: 0
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Senior Member |
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Thanks. The engine was bored to 40 over when rebuilt. It may be the rings not seat real good or the ring grove worn. The pistons were not knew. When first assemble the engine used oil at rate of 1 quart per 100 or so miles. It took nearly 5k miles before it quit using oil. The motor has about 18k on it now. I used chrome rings … mistake.
My oil pressure is a little lower than I like. It runs 40 lbs at 2350 rpm which is a little with 20 50 oil.
Art
On Aug 20, 2014, at 10:59 AM, James Hupy wrote:
> High oil consumption under periods of heavy throttle are usually an
> indicator of poor fit on pistons, or rings that are not seated. If original
> pistons were used in worn bores that were cross hatched but slightly out of
> round or tapered, this could be a cause. Perhaps another cause might be
> worn ring lands on the pistons. I don't know what kind of a rebuild you
> have, so I am just throwing out possible conditions that MIGHT exist. Worn
> valve guides will usually use oil at a consistent rate, and are more likely
> to use oil on closed throttle, higher rpm use like long downgrades. Two
> different sets of conditions. One heavy piston loading, with fairly wide
> open throttle. The other one is light piston loading, closed throttle, high
> engine vacuum. Another cause might be a cracked intake manifold or poorly
> fitted one. A cylinder balance test using shop air should uncover the
> culprit. Lacking the proper tools for a cylinder balance test, a wet/dry
> standard compression test will shed some light on your problems as well.
> Jim Hupy
> Salem, OR
> 78 GMC Royale 403
>
>
> On Wed, Aug 20, 2014 at 8:42 AM, 1104agm wrote:
>
>> Thanks JIm. I already run a quart low. Any other ideas.
>>
>> On Aug 19, 2014, at 11:29 PM, Jim Kanomata wrote:
>>
>>> Not sure what is going on,but you might run the engine oil level one
>> quart
>>> lo and e if that will resolve some of your usage.
>>> Majority of the coaches run on full mark and blow out the first quart
>>> rapidly.
>>>
>>>
>>>
>>> On Tue, Aug 19, 2014 at 7:11 PM, 1104agm wrote:
>>>
>>>> I just got back from about a 2k trip. My oil consumption was ok most of
>>>> the time. If I had to pull a serious grade I would drop 2 quarts of oil
>>>> real fast. 50 miles after it checked full at the fill up I was down 2
>>>> quarts when I parked for the nite. On another leg on I 81 in Virgin
>> were I
>>>> pulled some long grades and ran it hard holding speed all the way up the
>>>> grades, when I stopped I was 2 quarts low again. On the last 400 miles
>> I
>>>> ran easy on the few hills I did not use any oil. It was still at the
>> same
>>>> mark as when I had refilled it after I added the 2 quarts. I hate the
>>>> problems that seem to come and go depending on how you drive. Anyone
>> have
>>>> any idea as to what the problem might be.
>>>>
>>>> I drive at 65 and pull a GEO Tracker. I use 20 50 oil and the engine
>> has
>>>> about 15k on it since it was rebuilt. The oil pressure reads 40 psi and
>>>> did not change when I lost the oil. When I lost the oil I was running
>> up
>>>> the hills with Q jet secondaries open and vacuum reading near zero. On
>> the
>>>> early leg I dropped to 45 mph and shifted into second gear for a while
>> and
>>>> pushed it to 50 mph before shifting back to high. Stock rear end ratio
>> on
>>>> my RV.
>>>>
>>>> Art & Doris
>>>> 76 EL
>>>> Decatur AL
>>>> _______________________________________________
>>>> GMCnet mailing list
>>>> Unsubscribe or Change List Options:
>>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>>
>>>
>>>
>>>
>>> --
>>> Jim Kanomata
>>> Applied/GMC, Fremont,CA
>>> jimk@appliedairfilters.com
>>> http://www.appliedgmc.com
>>> 1-800-752-7502
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
> _______________________________________________
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| Re: [GMCnet] Oil Usage Issue [message #259561 is a reply to message #259467] |
Thu, 21 August 2014 00:02 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Using exotic rings is not wise unless the machine shop has proper stones to
hone the bore properly.
Dick Patterson and I discuss engines frequently ans share lot of stories,
good and bad.
As much stuff as I have in my CAD 540cid, I am using the standard rings.
On Wed, Aug 20, 2014 at 9:40 AM, 1104agm wrote:
> Thanks. The engine was bored to 40 over when rebuilt. It may be the
> rings not seat real good or the ring grove worn. The pistons were not
> knew. When first assemble the engine used oil at rate of 1 quart per 100
> or so miles. It took nearly 5k miles before it quit using oil. The motor
> has about 18k on it now. I used chrome rings … mistake.
>
> My oil pressure is a little lower than I like. It runs 40 lbs at 2350 rpm
> which is a little with 20 50 oil.
>
> Art
> On Aug 20, 2014, at 10:59 AM, James Hupy wrote:
>
>> High oil consumption under periods of heavy throttle are usually an
>> indicator of poor fit on pistons, or rings that are not seated. If
> original
>> pistons were used in worn bores that were cross hatched but slightly out
> of
>> round or tapered, this could be a cause. Perhaps another cause might be
>> worn ring lands on the pistons. I don't know what kind of a rebuild you
>> have, so I am just throwing out possible conditions that MIGHT exist.
> Worn
>> valve guides will usually use oil at a consistent rate, and are more
> likely
>> to use oil on closed throttle, higher rpm use like long downgrades. Two
>> different sets of conditions. One heavy piston loading, with fairly wide
>> open throttle. The other one is light piston loading, closed throttle,
> high
>> engine vacuum. Another cause might be a cracked intake manifold or poorly
>> fitted one. A cylinder balance test using shop air should uncover the
>> culprit. Lacking the proper tools for a cylinder balance test, a wet/dry
>> standard compression test will shed some light on your problems as well.
>> Jim Hupy
>> Salem, OR
>> 78 GMC Royale 403
>>
>>
>> On Wed, Aug 20, 2014 at 8:42 AM, 1104agm wrote:
>>
>>> Thanks JIm. I already run a quart low. Any other ideas.
>>>
>>> On Aug 19, 2014, at 11:29 PM, Jim Kanomata
> wrote:
>>>
>>>> Not sure what is going on,but you might run the engine oil level one
>>> quart
>>>> lo and e if that will resolve some of your usage.
>>>> Majority of the coaches run on full mark and blow out the first quart
>>>> rapidly.
>>>>
>>>>
>>>>
>>>> On Tue, Aug 19, 2014 at 7:11 PM, 1104agm wrote:
>>>>
>>>> > I just got back from about a 2k trip. My oil consumption was ok most
> of
>>>> > the time. If I had to pull a serious grade I would drop 2 quarts of
> oil
>>>> > real fast. 50 miles after it checked full at the fill up I was down 2
>>>> > quarts when I parked for the nite. On another leg on I 81 in Virgin
>>> were I
>>>> > pulled some long grades and ran it hard holding speed all the way up
> the
>>>> > grades, when I stopped I was 2 quarts low again. On the last 400
> miles
>>> I
>>>> > ran easy on the few hills I did not use any oil. It was still at the
>>> same
>>>> > mark as when I had refilled it after I added the 2 quarts. I hate the
>>>> > problems that seem to come and go depending on how you drive. Anyone
>>> have
>>>> > any idea as to what the problem might be.
>>>> >
>>>> > I drive at 65 and pull a GEO Tracker. I use 20 50 oil and the engine
>>> has
>>>> > about 15k on it since it was rebuilt. The oil pressure reads 40 psi
> and
>>>> > did not change when I lost the oil. When I lost the oil I was running
>>> up
>>>> > the hills with Q jet secondaries open and vacuum reading near zero.
> On
>>> the
>>>> > early leg I dropped to 45 mph and shifted into second gear for a while
>>> and
>>>> > pushed it to 50 mph before shifting back to high. Stock rear end
> ratio
>>> on
>>>> > my RV.
>>>> >
>>>> > Art & Doris
>>>> > 76 EL
>>>> > Decatur AL
>>>> > _______________________________________________
>>>> > GMCnet mailing list
>>>> > Unsubscribe or Change List Options:
>>>> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>> >
>>>>
>>>>
>>>>
>>>> --
>>>> Jim Kanomata
>>>> Applied/GMC, Fremont,CA
>>>> jimk@appliedairfilters.com
>>>> http://www.appliedgmc.com
>>>> 1-800-752-7502
>>>> _______________________________________________
>>>> GMCnet mailing list
>>>> Unsubscribe or Change List Options:
>>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Oil Usage Issue [message #259601 is a reply to message #259561] |
Thu, 21 August 2014 11:47 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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jimk wrote on Wed, 20 August 2014 22:02Using exotic rings is not wise unless the machine shop has proper stones to
hone the bore properly.
Dick Patterson and I discuss engines frequently ans share lot of stories,
good and bad.
As much stuff as I have in my CAD 540cid, I am using the standard rings.
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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I once rebuilt a 350 in a '69 Chevy 3/4 ton and made the mistake of using chrome faced piston rings. That engine always used oil, especially at highway speeds. It didn't use much around town, but at any speed over 60, it used a quart in 100 miles. No smoke or leakage either. It was strange, but I'm guessing it had something to do with the chrome rings. Subsequent engines that I have rebuilt, I have used moly filled rings and they have never had oil consumption issues at all.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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