Home » Public Forums » GMCnet » Low pro carb hat. What's a good lowpro hat? Want my hatch flush again
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| Re: [GMCnet] Low pro carb hat. What's a good lowpro hat? Want my hatch flush again [message #362498 is a reply to message #362497] |
Tue, 23 February 2021 13:40   |
stu@97381.com, Emery
Messages: 232
Registered: June 2020
Karma: 2
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Senior Member |
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I determined years ago that the air horn from my 1993 Jeep Grand Cherokee would work. It may look small to some people but the intake had the same cross section area as the original hose to the 455 air filter.
I have used it for years and it works fine. You have to remove the metal insert in it to get it to fit over the throttle body (or carb).
Many people are now using it after I suggested it.
Emery Stora
emerystora@mac.com
> On Feb 23, 2021, at 12:03 PM, Keith V via Gmclist wrote:
>
> There's a Jeep one that people use, it requires an external air filter.
> Personally it looks really small, I just use the stock air cleaner and the stock manifold. If you have a non stock manifold I guess you're stuck
> ________________________________
> From: Gmclist on behalf of Shan Rose via Gmclist
> Sent: Tuesday, February 23, 2021 11:50 AM
> To: gmclist@list.gmcnet.org
> Cc: Shan Rose
> Subject: [GMCnet] Low pro carb hat. What's a good lowpro hat? Want my hatch flush again
>
> Question is in the title
> --
> 73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
>
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| Re: [GMCnet] Low pro carb hat. What's a good lowpro hat? Want my hatch flush again [message #362499 is a reply to message #362497] |
Tue, 23 February 2021 13:52 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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I'm using the Jeep snorkel, per Emery's suggestion. There are 3/4"-1"
spacer rings which can be used between the snorkel and the carb (or
throttle body) to provide a little larger air passage into the throat.
I use a heavily rubber coated corrugated hose (called "picker hose" at the
local John Deere dealer) to connect to a large conically shaped paper
filter behind the left headlight. Some use air cleaner housings from other
vehicles.
HTH,
Ken H.
On Tue, Feb 23, 2021 at 2:41 PM Emery Stora via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I determined years ago that the air horn from my 1993 Jeep Grand Cherokee
> would work. It may look small to some people but the intake had the same
> cross section area as the original hose to the 455 air filter.
>
> I have used it for years and it works fine. You have to remove the metal
> insert in it to get it to fit over the throttle body (or carb).
>
> Many people are now using it after I suggested it.
>
> Emery Stora
> emerystora@mac.com
>
>
>
>> On Feb 23, 2021, at 12:03 PM, Keith V via Gmclist gmclist@list.gmcnet.org> wrote:
>>
>> There's a Jeep one that people use, it requires an external air filter.
>> Personally it looks really small, I just use the stock air cleaner and
> the stock manifold. If you have a non stock manifold I guess you're stuck
>> ________________________________
>> From: Gmclist on behalf of Shan Rose
> via Gmclist
>> Sent: Tuesday, February 23, 2021 11:50 AM
>> To: gmclist@list.gmcnet.org
>> Cc: Shan Rose
>> Subject: [GMCnet] Low pro carb hat. What's a good lowpro hat? Want my
> hatch flush again
>>
>> Question is in the title
>> --
>> 73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
>>
>> _______________________________________________
>> 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
>
>
> _______________________________________________
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Low pro carb hat. What's a good lowpro hat? Want my hatch flush again [message #362502 is a reply to message #362496] |
Tue, 23 February 2021 15:12 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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if I was still running a carb, I would stick with a stock intake. Some people want big $$, but there is enough people switching to efi and remote air filters, I am sure a deal can be found...
I have a jeep snorkle in the garage, I would sell, but I really am bad at boxing things and shipping in a timely manner, so have been hoping someone needs it local. if not local, you are probably better sourcing it local. The reason I have jeep snorkle in the garage rather then the coach, is I really like the spectre low profile one much better:
https://www.amazon.com/Spectre-Performance-Polished-Profile-Single/dp/B004AJ6GIC/ref=sr_1_4?dchild=1&keywords=spectre+intake+low+profile&qid=1 614114349&sr=8-4
i know I did not pay that much 2 years ago, so maybe summit or somewhere has a better price. it does take the right spacer(ebay or amazon), to make it fit right on whatever carb you have. it needs to be spaced almost to the deck of the engine hatch in order for it to properly clear the valve cover.
I have a spectre hose, and fabricated mount for the air cleaner on my efi setup.
https://3.bp.blogspot.com/-VF-DEj7gl74/XNTPT_X8ZjI/AAAAAAAAliI/5n3PuzDNLeoLc-079bqFOPunywr6yOMZwCKgBGAs/s1600/IMG_6010.JPG
https://3.bp.blogspot.com/-HNGTqBhjmXo/XNTPT95fllI/AAAAAAAAliI/eUG8Q9dS_M4OECPBqCObRGUJoD2eDbZeQCKgBGAs/s1600/IMG_6076.JPG
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] Low pro carb hat. What's a good lowpro hat? Want my hatch flush again [message #362504 is a reply to message #362503] |
Tue, 23 February 2021 15:54 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Any abrupt turn in an inlet tract will SEVERELY negatively effect
horsepower production at high airflow. As will right angle turns in the
inlet. The seemingly inconsequential "flow bumps" in small block chev 202
heads were developed after endless flow bench and dyno testing. They
account for a significant boost in flow at certain rpms when coupled with
the correct compatible carbs, intake manifolds, compression ratios, cam
shaft profiles, gaskets, and header diameter and tube shapes.
When we drag raced small block chevs back in the late '50s and early
'60s, we kept 302 cubic inch motors alive at 9000 rpms, when no one else
seemed to be able to keep one alive for long much over 7500. Had lots of
guys peeking over my shoulders any time I had an engine apart to learn how
we did it. Hard earned secrets, kept mostly in my head, now as then.
Jim Hupy
Salem, Oregon
On Tue, Feb 23, 2021, 1:30 PM Larry via Gmclist
wrote:
> Thinking back on this Jeep snorkel, someone out there had it on their 455
> and ran it on a chassis dyno. Above 3K rpm it fell flat on its face. Whoever
> it was running the dyno speculated that the Jeep snorkel was the cause.
> The air coming in at 3K did not have time to straighten out after making the
> right angle turn and the turbulence of the flow was interrupting the
> effectiveness of the venturi effecting the FA mixture. They placed a 1"
> spacer
> between the snorkel and the carb to give the air time to straighten out.
> That took care of the problem, and engine pulled strong to 4K. Wish I could
> remember who that was, but might be worth considering that you have an
> extra 1" there in case you have power issues. JMHO
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
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| Re: [GMCnet] Low pro carb hat. What's a good lowpro hat? Want my hatch flush again [message #362505 is a reply to message #362504] |
Tue, 23 February 2021 16:19 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Many years ago, when I first put a snorkel on the 455, I used a
"corrugated" rubber hose, taken off of something in the junkyard 'cause it
looked good and fit where I needed it. May have been off of some 2L
engine, for all I know. It really worked out nicely -- until the first
time I was doing about 50 mph and stepped into "passing gear". Suddenly,
beside the passee, my engine died! After that happened a few times, I
tried it with the hatch open. When that 455 ci air demand went high at
full throttle, that convoluted rubber collapsed, acting like a fully
closed choke!
Now I use "picker hose", designed to suck cotton bolls out of their shells
and deliver them to the baler. :-)
Ken H.
On Tue, Feb 23, 2021 at 4:55 PM James Hupy via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Any abrupt turn in an inlet tract will SEVERELY negatively effect
> horsepower production at high airflow. As will right angle turns in the
> inlet. The seemingly inconsequential "flow bumps" in small block chev 202
> heads were developed after endless flow bench and dyno testing. They
> account for a significant boost in flow at certain rpms when coupled with
> the correct compatible carbs, intake manifolds, compression ratios, cam
> shaft profiles, gaskets, and header diameter and tube shapes.
> When we drag raced small block chevs back in the late '50s and early
> '60s, we kept 302 cubic inch motors alive at 9000 rpms, when no one else
> seemed to be able to keep one alive for long much over 7500. Had lots of
> guys peeking over my shoulders any time I had an engine apart to learn how
> we did it. Hard earned secrets, kept mostly in my head, now as then.
> Jim Hupy
> Salem, Oregon
>
> On Tue, Feb 23, 2021, 1:30 PM Larry via Gmclist
> wrote:
>
>> Thinking back on this Jeep snorkel, someone out there had it on their 455
>> and ran it on a chassis dyno. Above 3K rpm it fell flat on its face.
> Whoever
>> it was running the dyno speculated that the Jeep snorkel was the cause.
>> The air coming in at 3K did not have time to straighten out after making
> the
>> right angle turn and the turbulence of the flow was interrupting the
>> effectiveness of the venturi effecting the FA mixture. They placed a 1"
>> spacer
>> between the snorkel and the carb to give the air time to straighten out.
>> That took care of the problem, and engine pulled strong to 4K. Wish I
> could
>> remember who that was, but might be worth considering that you have an
>> extra 1" there in case you have power issues. JMHO
>> --
>> Larry
>> 78 Royale w/500 Caddy
>> Menomonie, WI.
>>
>> _______________________________________________
>> 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
>
_______________________________________________
GMCnet mailing list
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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