I've access to all the equipment I need for fabing a manifold. Trying to gather as much info as possible before I begin.
Making a log style manifold would be simpler than an equal length manifold.
As it appliest to boost, what are the differeneces between them.
It would appear that a log style manifold would not flow as well as equal length? Are there any negative affects from running log style?
thx
Log Style vs Equal Lenth Turbo Mani
the only negative effect from running a log manifold would be waste gate problems(where to put it), and the loss of power due to odd distribution of exhaust piping length. idealth, equal length pipes evenly distribute exhaust backpressure and velocity resulting in smoother power and, soemtimes, more power..
god I hope thats right or K is gonna ream me.
-chet
god I hope thats right or K is gonna ream me.
-chet
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TrunkMonkey
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Exar-Kun: Cracking: They are more prone to cracking as the length of the piping is obviously longer (duh to me), but companies often use a thinner gauge to create the curved manifolds. The constant vibration from a daily driven car can cause manifolds which havent been braced properly to crack. To check out a sweet EL manifold, look at http://www.full-race.comThey only sell honda manifolds now, but i believe they are working on one for the FWD sr20det.heat: The longer tubing results in a much greater surface area, which allows more heat to dissipate to the engine bay. This also causes a reduction in velocity.
EL manifolds are great if your plan on making big numbers, but is a waste of time on a 5-7psi setup.
EL manifolds are great if your plan on making big numbers, but is a waste of time on a 5-7psi setup.
see, I would figure that most EQ style turbo manifols would be less prone to cracking, simply because the construction is usually of tubular steel with a ceramic coating, wheres as log style is usually a casting which can have weak spots in the casting(grain) of the material, allong with cinosistencies in thickeness, etc...
also, a ceramic coating on the EQ styles removes the problem of greater surface area of the manifold radiating more heat, and Im not so sure about that recuting velocity, considering if a log style had greater velocity it would spool better, but it does not.
-chetIm not, like K, at all authorative about this subject, Im just posting theories..
also, a ceramic coating on the EQ styles removes the problem of greater surface area of the manifold radiating more heat, and Im not so sure about that recuting velocity, considering if a log style had greater velocity it would spool better, but it does not.
-chetIm not, like K, at all authorative about this subject, Im just posting theories..
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TrunkMonkey
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you're more correct than Mattew is.
most equal length manifolds are stronger than logs. they're usually constructed with better materials. heat isn't that big of a problem since there are tons of coatings and wraps that can be usedQuote »The longer tubing results in a much greater surface area, which allows more heat to dissipate to the engine bay. This also causes a reduction in velocity.[/quote] the tubing's diameter is what affects gas velocities, not length. the smaller the diameter the better.
most equal length manifolds are stronger than logs. they're usually constructed with better materials. heat isn't that big of a problem since there are tons of coatings and wraps that can be usedQuote »The longer tubing results in a much greater surface area, which allows more heat to dissipate to the engine bay. This also causes a reduction in velocity.[/quote] the tubing's diameter is what affects gas velocities, not length. the smaller the diameter the better.
Yes! Yes! no we are talking. That's exactly what I need.
Sonic Boom powered Turbo manifold. w/ leds too!
This is going to be a difficult decision, especiall for a guy who has logged a grand total of 0 hours behind a welder Sure I'll have ppl their who can weld far better than I, but satisfaction from a mediocre job done right.
Bare in mind, with .5bar boost goals, how negative will the affects of a log style be?
and..
Any one with experience in making a manifold, is it that much harder to fab an EL manifold?
tks all.
Sonic Boom powered Turbo manifold. w/ leds too!
This is going to be a difficult decision, especiall for a guy who has logged a grand total of 0 hours behind a welder Sure I'll have ppl their who can weld far better than I, but satisfaction from a mediocre job done right.
Bare in mind, with .5bar boost goals, how negative will the affects of a log style be?
and..
Any one with experience in making a manifold, is it that much harder to fab an EL manifold?
tks all.
Check out this webpage. If you go to sds' tech page on their website, there are great articles for the DIY'er.
http://www.sdsefi.com/techheader.htm
-john
http://www.sdsefi.com/techheader.htm
-john
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TrunkMonkey
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i really don't feel like typing tonite, so think about this...george wrote:demcj,
lenght of the EL manifold effects gas velocities too. if the manifold is too long the gases accelerate to the speed of sound and create a sort of sonic boom within the manifold. this also contributes to the cracking of the mani and poor spool up of the turbo.
if what your saying is true, then why do tri-y and 4 into 1 headers make so much power?
sonic boom? sheesh!
look at the cosworth formula 1 turbo manifolds...note the design. they have unrestricted space constrants and the manis are long and twisty guiding the exhaust gases to maximum velocity. lenght is very much a factor as is diameter and material. these are all contributing factors to optimum mani design. often certain mani designs crack even when made of high quality stainless steel. heat is not the culprit but some thing called sonic boom. it causes violent movement of the exhaust gases which cause the mani to crack.
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TrunkMonkey
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TrunkMonkey
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TrunkMonkey
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