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equal length mani
is it neccessary for a mani to be equal length, if so why?
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Re: equal length mani
i don't think so, i think if it is equal lenght it flows the exhaust better. my .02
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Re: equal length mani
I think the turbo will spool faster because of the exhaust pulse rythm.
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Re: equal length mani
Neccessary, No. Better, yes.
Look at how many people arnt running equal lengths. Im guessing they are sporting a little bit slower spool and a little bit fatter wallet. ;) |
Re: equal length mani
of course it will spool faster, otherwise they wouldn't make them.
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Re: equal length mani
Originally Posted by daubleaaron
Neccessary, No. Better, yes.
Look at how many people arnt running equal lengths. Im guessing they are sporting a little bit slower spool and a little bit fatter wallet. ;) |
Re: equal length mani
im not a genius but id guess its more the length of the runners that you should worry about then them being equal length
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Re: equal length mani
actually a ramhorn will spool tghe turbo a bit slower.....
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Re: equal length mani
Originally Posted by hotrex
actually a ramhorn will spool tghe turbo a bit slower.....
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Re: equal length mani
dont roll your eyes at me noob, you want proof??
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Re: equal length mani
people its not that hard to understand. equal length = longer runners which will have a slightly slower spool time. is it that much of a differnce. not really. is it worth all the money. definately not. id take a log mani and save all that other money for other turbo goodies.
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Re: equal length mani
Originally Posted by hotrex
dont roll your eyes at me noob, you want proof??
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Re: equal length mani
Originally Posted by raprazant
people its not that hard to understand. equal length = longer runners which will have a slightly slower spool time. is it that much of a differnce. not really. is it worth all the money. definately not. id take a log mani and save all that other money for other turbo goodies.
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Re: equal length mani
Well the FR test a saw between the log and equal was a big difference
I think it all about budget. I say crawl before walk. |
Re: equal length mani
well the log mani will allow you to max out the output of your stock block
thats all u want anyways but for a budget d series build no maybe when your running 25 psi yes. |
Re: equal length mani
i haven't seen a ram horn style manifold yet that is a "true equal length" manifold. sure the 1 and 4 runners are the same length and the 2 and 3 runners are the same length, but all 4 are not the same length in all the ramhorns i've seen. the 2 and 3 runners always tend to be a bit longer. the advantage of a ramhorn over something like a log manifold is the way the collector merges all the runners together into a funnel directing the exhaust into the turbo. but having all 4 runners the same length i would think would be most optimal. i am trying to design a manifold that will have all 4 runners the same length but it isn't easy. first i'm going to build a short runner manifold based on the design of the manifold that is on the top fuel civic.
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Re: equal length mani
Originally Posted by weirRacing
i haven't seen a ram horn style manifold yet that is a "true equal length" manifold. sure the 1 and 4 runners are the same length and the 2 and 3 runners are the same length, but all 4 are not the same length in all the ramhorns i've seen. the 2 and 3 runners always tend to be a bit longer. the advantage of a ramhorn over something like a log manifold is the way the collector merges all the runners together into a funnel directing the exhaust into the turbo. but having all 4 runners the same length i would think would be most optimal. i am trying to design a manifold that will have all 4 runners the same length but it isn't easy. first i'm going to build a short runner manifold based on the design of the manifold that is on the top fuel civic.
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Re: equal length mani
or run twin seqential turbos, one to spool the other. i dunno if that would be any faster though
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Re: equal length mani
Originally Posted by MAJORAHOLE
or run twin seqential turbos, one to spool the other. i dunno if that would be any faster though
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Re: equal length mani
Equal length is marginally more efficient because of it equalizing backpressure between each cylinder. Tubular manifolds in general will flow better. This creates less reversion and allows your turbo to maintain boost at high rpm's where boost might start dropping off with a log mani. The downside is that the larger(I'm generalizing about the tons off different configurations) physical volume and surface area of a tubular mani will cause more lag.
Manifolds are (like anything else) a compromise between cost/effort and performance. Is it worth the extra time/money to build/buy that fancy tubular manifold? IMO build a tubular with a 4-1 collector that keeps the runners as short as possible. If you had a twin-entry CT26 you could pair cylinders 1-3 and 2-4 so they fired into seperate inlets. The ultimate setup for high boost would be JR supercharger and a large turbo. The extra exhaust volume from the supercharger would help spool the turbo very quickly. You would need a serious motor to take advantage of this though. |
Re: equal length mani
No you should pair 1-4 and 2-3
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