Log header vs truck manifolds
09-08-2005, 09:20 PM
#1
09-08-2005, 10:39 PM
#5
A log header is one pipe if you will going from one end of the exhaust ports to the other with short pipes going to the ports. Not sure if they're all like that but that's what i think of when someone sais log header.A manifold has 4 longer pipes going into 1 bigger opening. Or collector if you have headers.
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09-08-2005, 10:45 PM
#8
Well I will say the factory manifolds will hold up better that is for sure the thin material that is used in making most of these log manifolds are made of cracks with the constant expansion from heating and cooling etc... The cast manifolds will last longer without to much problems. I am no expert I am just stating what I have herd from a few others so take it for what it is worth although I am installing Robs old kit on a car as we speak and 3 out of the 4 primaries were cracked. High bost levels will make this problem worse and more abundant LOL!
09-08-2005, 10:47 PM
#9
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John, the truck manifolds can flow quite a bit, and are cast, so there is no cracking issues, and the factory already took into account the exhaust pulse/scavenging issues when the designed the manifold. As well, cheaper.
So from my understanding, the truck manifolds are:
Cheaper
Durable
High Flowing
pulse timing efficient
So from my understanding, the truck manifolds are:
Cheaper
Durable
High Flowing
pulse timing efficient
09-08-2005, 10:54 PM
#10
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the stock manifolds do flow well for what they are, thats why you dont see any gains when you step up to shorties you have to go for long tubes to get any gain at all over the stock manifolds.
If you need a set of stock manifolds let me know Im lettin em go cheap with the heat shields. Less than 2k on them.
If you need a set of stock manifolds let me know Im lettin em go cheap with the heat shields. Less than 2k on them.
09-09-2005, 01:12 AM
#14
Originally Posted by Pro Stock John
I'm missing something here, why is a truck manifold much better than a log manifold? They look pretty similar to me./generalization
cause smokinhawk said so..he is building a nice single turbo set up useing these.
casted gm has gone to extensive limits testing these manifolds. taking them to highest extreme temps
there strong like the old cas kits the manifolds where great just didnt leave to much room for upgraded turbo's
stenod racings white forumla twin is useing these manifolds. and also w2w has a crazy single turbo car running these..both are well over the 1000 hp mark.
09-09-2005, 05:38 AM
#15
Originally Posted by Pro Stock John
I'm missing something here, why is a truck manifold much better than a log manifold? They look pretty similar to me./generalization
the exhaust pulses main fall back is cracking manafolds. they heat and contract at an uneven rate which will overtime crack about any steel manafold.
now the cast truck manafolds are basically a log style manafold, but being made out of a casting you do not have to worry about them cracking cause they are extremely strong, so the main fall back of uneven exhaust pulses do not apply.
typically a equal length header system is more effient then a log set up.
another thing to consider truck headers verses the tti / stainlessworks log is that on the tti / SW log the exhaust gasses from the other bank flows threw the common point of the log, causing a restriction and causing even worse uneven exhaust pulses. the truck header set up will flow almost evenly from each bank and the robustness of the material it will be able to stand up to the uneven exhaust pulses so that its not an issue.
09-09-2005, 07:32 AM
#18
hold up guys...
the reason people hate on the log manifold on this site is because of the ttech street kit and Q M P kit cracking and having a lower performance potential.
the reason its potential is lower is because they flow BOTH banks through the drivers log. If the drivers log only had to carry the drivers exhaust there would be no problem.
lots of cars make lots of horsepower with log headers.
the reason people hate on the log manifold on this site is because of the ttech street kit and Q M P kit cracking and having a lower performance potential.
the reason its potential is lower is because they flow BOTH banks through the drivers log. If the drivers log only had to carry the drivers exhaust there would be no problem.
lots of cars make lots of horsepower with log headers.
09-09-2005, 08:36 AM
#19
Originally Posted by MIGHTYMOUSE
hold up guys...
the reason people hate on the log manifold on this site is because of the ttech street kit and Q M P kit cracking and having a lower performance potential.
the reason its potential is lower is because they flow BOTH banks through the drivers log. If the drivers log only had to carry the drivers exhaust there would be no problem.
lots of cars make lots of horsepower with log headers.
the reason people hate on the log manifold on this site is because of the ttech street kit and Q M P kit cracking and having a lower performance potential.
the reason its potential is lower is because they flow BOTH banks through the drivers log. If the drivers log only had to carry the drivers exhaust there would be no problem.
lots of cars make lots of horsepower with log headers.
