Question for Offy users
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Question for Offy users
I have read many threads and individual posts concerning those who heat the intake either with the plate some have made for the bottom or the spacer between the carb and intake.
My question: is anyone using an Offenhauser intake and not heating it? Why or why not?
I have the Offy dp, Hedman headers, edelbrock 500cfm, yet to be installed.
Thanks
Russ
My question: is anyone using an Offenhauser intake and not heating it? Why or why not?
I have the Offy dp, Hedman headers, edelbrock 500cfm, yet to be installed.
Thanks
Russ
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Joined: Dec 2006
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From: Spokane, WA
Why not run without is because without heating the intake, atomization of the fuel/air mix is poor with the fuel dropping out and puddling on the floor of the intake resulting in poor driveability and performance.
Lead Driver
Joined: Mar 2008
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Ford used exhaust to heat it. I wonder if by using the coolant we are giving first warmth, and then actually cooling the 'sweet spot'.
It seems an ideal product would be one of steel tubing that maybe clamped onto a header tube on either side, and had a steel plate which bolted to the bottom of the intake, replicating, in a way, what Ford had.
When I interviewed the present owner of Clifford Performance, he mentioned how Jack, at a drag race, had wrapped copper wire around his exhaust and stuffed it up under the intake. Of course he ran a great time. So maybe added heat is needed. But then Clifford used the coolant too.
It seems an ideal product would be one of steel tubing that maybe clamped onto a header tube on either side, and had a steel plate which bolted to the bottom of the intake, replicating, in a way, what Ford had.
When I interviewed the present owner of Clifford Performance, he mentioned how Jack, at a drag race, had wrapped copper wire around his exhaust and stuffed it up under the intake. Of course he ran a great time. So maybe added heat is needed. But then Clifford used the coolant too.
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I didn't have heat plumbed to my C-Series for the first couple of years I had it.
Once I plumbed heat to the bottom a flat spot at WOT I'd been chasing went away. You'd think the exhaust manifolds would heat the intake enough, maybe with the stock log manifold it would, EFI exhaust/headers don't.
Once I plumbed heat to the bottom a flat spot at WOT I'd been chasing went away. You'd think the exhaust manifolds would heat the intake enough, maybe with the stock log manifold it would, EFI exhaust/headers don't.
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From: Spokane, WA
The water heat/coolant actually provides a stable operating temperature range/window for the A/F to operate in. Carbed engines 'like' that. And what BVA said. For as long as I have been reading this Forum and FSP the bog-flat spot-stutter-hesitate-stumble monster has consistently reared it's head when someone uses an intake without heating it...and that cannot be adjusted out by means of the carb.
Lead Driver
Joined: Mar 2008
Posts: 7,173
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From: Near Los Angeles
The water heat/coolant actually provides a stable operating temperature range/window for the A/F to operate in. Carbed engines 'like' that. And what BVA said. For as long as I have been reading this Forum and FSP the bog-flat spot-stutter-hesitate-stumble monster has consistently reared it's head when someone uses an intake without heating it...and that cannot be adjusted out by means of the carb.
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Thank you for the responses. It is much clearer to me now. Since no one spoke up in favor of going without, I will probably go for the heated spacer route. It seems easy enough to purchase one as opposed to trying to make the plate hose adapter for the bottom of the offy. Even though there are very good pics and such on the forum, I do not have a welder.
I have been lurking and studying here for a while. I must say, this is quite a body of knowledge. An enormous resource for those of us looking to learn.
Thanks again
Russ
I have been lurking and studying here for a while. I must say, this is quite a body of knowledge. An enormous resource for those of us looking to learn.
Thanks again
Russ
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run'n the heated spacer here and have tested it down to the low teens outside with no issues
mid to late 60's v8 had them and work just fine for this setup so a cheap way to go. check ebay or junk yard for them
if ya run a holly 390 on the offy a spacer is needed anyways for linkage clearance so why not have a heated one
mid to late 60's v8 had them and work just fine for this setup so a cheap way to go. check ebay or junk yard for themif ya run a holly 390 on the offy a spacer is needed anyways for linkage clearance so why not have a heated one
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From: Spokane, WA
@Kevin: Actually I think the stock OEM heat set-up is superior in one area...the time it takes to get the manifold up to temp. After that I don't know that there is an advantage or disadvantage to be held by either method.
Lead Driver
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