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Header info, right or wrong ?


 
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honesT
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Joined: 12 Nov 2010
Location: Coquitlam B.C. Canada

PostPosted: Thu Dec 09, 2010 11:17 am    Post subject: Header info, right or wrong ? Reply with quote

My 2cents from a newbie that only has research on his side tool

From what I have read the best set up is a header that flows from 3 to 2 to 1 like this one http://rustysoffroad.com/mm5/merchant.mvc?Screen=PROD&Store_Code=rustys&Product_Code=FD409&Category_Code=headers

As far as going to a larger than 2.5 diameter pipe it has been stated that all is good with longer pipes to improve exhuasting the spent combustion chamber gasses thus allowing more fresh air into the combustion chamber giving a better explosion, BUT the larger than 2.5 diameter pipes are said to effect the back pressure of the system ( I`m guessing it has something to do with the compression like a vaccum cleaner going to big will only cause a tornato affect instead of a straight flow ) and rob the engine of it`s good gass mileage due to the combustion chamber still being full of gasses from the last explosion...

This is just what I can gather from what I have read, Myself I have decided not to go with a header as my stock manifold is still in good condition and my 96 cherokee is only a stock engine and the only noticable gain I would get is a louder growl... I have up graded my exhuast system to a 2.5 high flow from the bottom of the stock manifold to the tail pipe and this setup will help my engine breath better and improve my gas mileage a little, My next upgrade is a cold air intake and larger throttle body to better improve the clean air flow into the combustion chamber, of course after I has researched the crap out of everything I hate waisting time and money Finger
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FARMER
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Joined: 29 May 2007
Location: Benicia Ca.

PostPosted: Thu Dec 09, 2010 4:28 pm    Post subject: Reply with quote

I use the Gibson 6:1 header, I bought as a replacement for a cracked stock manifold, the thing I noticed right off is that it didn't kick down from O.D. on freeway overpasses anymore. The header provided enough top end horsepower to keep the RPM's up and slightly increased the gas mileage. A cold air intake will most likely do the same thing.
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honesT
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Joined: 12 Nov 2010
Location: Coquitlam B.C. Canada

PostPosted: Thu Dec 09, 2010 5:49 pm    Post subject: Reply with quote

FARMER wrote:
I use the Gibson 6:1 header, I bought as a replacement for a cracked stock manifold, the thing I noticed right off is that it didn't kick down from O.D. on freeway overpasses anymore. The header provided enough top end horsepower to keep the RPM's up and slightly increased the gas mileage. A cold air intake will most likely do the same thing.



What year is your jeep ?

And do you have a high flow exhuast or just the header upgrade ?
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honesT
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Joined: 12 Nov 2010
Location: Coquitlam B.C. Canada

PostPosted: Thu Dec 09, 2010 6:00 pm    Post subject: Reply with quote

Maybe it does not kick out of OD right away because the engine is running smoother, ( the combustion chamber has more fresh air on each explosion giving it more power on each stroke ) allowing it to keep power with less throttle, so same peddle position as you always had but just smoother deeper breaths for the engine ?


Just an educated guess I could be way off but this seems to make sense in my head, for now...
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FARMER
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Joined: 29 May 2007
Location: Benicia Ca.

PostPosted: Mon Dec 13, 2010 9:29 am    Post subject: Reply with quote

It's a "95" ZJ with a FLOWMASTER 50 on the stock 2" exhaust, I had the muffler long before the header. I noticed it with the cruise control on, it would kick down about 3/4 of the way up the overpass, after the header it would climb it with no hesitation. The better flow from the header most likely gave it about 5 more horses at freeway speeds. The gas mileage increase is most likely from not having the throttle kick down as much.
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