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08-03-2007 06:43 AM #1
Dave S,
From what I have read, step headers will, in some cases be worth a few Hp - but not necessarily in a street driven car/engine. Stahl is not a big fan of them and this guy, the second listed, not sure of his credits, also does't feel that a step header is a real benefit - see #5. It makes sense to me.
I went to college with Jere Stahl - and he was developing interesting stuff w-a-a-a-y back then and was the class car geek.
http://www.stahlheaders.com/JpgFiles/issue3.pdf
http://www.x-pipe.com/Scavenge.html
Methinks(I know - archaic, but I'm an OF) that step headers need to be developed with a certain airflow - camshaft and head design and an RPM range that the engine will turn most of the time and that just welding up a set of pipes at arbitrary lengths without airflow/dyno tests wont do it and that Hp might suffer

If you do build them, please make sure that you keep the forum updated as I hope you can prove these guys wrong
.
Dave

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08-03-2007 07:15 AM #2
Some very interesting reading on Stahl's site, seems the other guy was just pedaling some new gimmick... Guess I'll go with Stahl's suggestions, he sure does seem to know his way around an engine, especially the exhaust side of it!!! The items on velocity are certainly true, can't argue with basic science!!!!! Gentle bends (didn't that used to be a TV show) and properly sized tubes and collector's still seem to be the best answer to cleaning out the exhaust. Maybe I was just hoping for a magic bullet!!!!!!!
Originally Posted by Irelands child
Yesterday is history, tomorrow is a mystery, Live for Today!
Carroll Shelby
Learning must be difficult for those who already know it all!!!!
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08-03-2007 07:27 AM #3
Originally Posted by Dave Severson
Dave S.
We've (almost) agreed on something - finally
!!!!!!!
Probably was a TV show - I just have never been addicted to the 1 eyed monster(except for car races). My wife is regularly saying "Isn't that (a name) from the TV show (a name)". My standard answer is that I was too busy earning a living in some faraway land to have watched that drivel.
Stahl headers have always seemed to be the Cadillac (now Lexus?
) in headers and he has been doing them for a long time for a lot of the 'name' racers, so his credibility, to me, is way up there.
Dave

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08-03-2007 07:43 AM #4
Dang, I just realized that!!!! I must be getting soft, heck it was 3 years before Uncle Bob and I ever agreed on anything!!!!!!!!!!!
Originally Posted by Irelands child
Gotta go do a little work, then it's off to another Friday afternoon at my favorite junkyard!!!!Yesterday is history, tomorrow is a mystery, Live for Today!
Carroll Shelby
Learning must be difficult for those who already know it all!!!!
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08-03-2007 08:18 AM #5
I do recall a few of the spears that you and Uncle Bob lobbed back and forth - maybe I'm more quietly opinionated
Originally Posted by Dave Severson
Happy pickin's - my big thing today is the lawn(about finished) and find some good 500 wet & dry to final sand so maybe, just possibly, I can put some color on some of my project parts next week.
Friday early disappearances are called POETS = (P*$$ Off Early Tomorrow's Saturday)Dave

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08-03-2007 06:58 PM #6
Methinks(I know - archaic, but I'm an OF) that step headers need to be developed with a certain airflow - camshaft and head design and an RPM range that the engine will turn most of the time and that just welding up a set of pipes at arbitrary lengths without airflow/dyno tests wont do it and that Hp might suffer

If you do build them, please make sure that you keep the forum updated as I hope you can prove these guys wrong
.[/QUOTE] well air flow and length has alot to do with any set of headders and heat get out of the tubing is power to more heat going out the tube and not threw it and how long has alot alot to do with were the engine is and where the tube needs to exit some times they get abit longer am i jerry stall NO but i build alot of headers and jerry is not me i do ok
shame less plug why not. i did build a set of step headders on here and posted all of it
well ok i am not jerry S or david V
Last edited by pat mccarthy; 08-03-2007 at 07:14 PM.
Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
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08-03-2007 07:37 PM #7
That was gonna be my suggestion Pat. Just get a compressor & push the air through the engine.
My theory is big exhaust & force the air through.
"PLAN" your life like you will live to 120.
"LIVE" your life like you could die tomorrow.
John 3:16
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08-03-2007 07:54 PM #8
you are a very smart man
Originally Posted by pro70z28
Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
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08-03-2007 07:56 PM #9
Thanks Pat. Check is in the mail.
"PLAN" your life like you will live to 120.
"LIVE" your life like you could die tomorrow.
John 3:16
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08-03-2007 08:03 PM #10
I topped 'em off with 4" collectors
"PLAN" your life like you will live to 120.
"LIVE" your life like you could die tomorrow.
John 3:16
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08-03-2007 08:07 PM #11
that looks good i would show you mine but.. some one may be looking there is a city bus missing the EX
Originally Posted by pro70z28
Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip






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