manifold length question
 

I am wanting to fab my own top mount manifold an i was wondering if anyone could give me info on distance of exhaust runners?Meaning is there a length that you dont want to exceed ?Is shorter better or longer?

I think shorter runners is the way to go. I mean unless you're doing some full blown out drag racing, no need for long runners.

no it's a d/d just want to keep a/c

you dont need a top mount to keep a/c

I know an correct me if i am wrong but top mounts perform better an they just look nasty as hell.I also like the ramhorn style but the top mount seems to me like your turbo is easier to get to an maintence.

Get or make a log top mount, those stainless ramshorns are prone to cracking, how good do you think you'd look then. lol

+1 log manifold are the way to go. ramhorn such as obx manifolds are def prone to cracking. log manifolds = bulletproof for the most part.

can you reach 5 to 600 hp with a log?

well the type of car an type of motor your talking about will limit that. what 600hp d/d do you want. def not a honda. maybe an s2000 but thats still a bit much for a dd.

What motor did i mention or did you do some jedi mind trick an read my mind ? an you can pull 500 hp out a 2.0 b-series just as well as a s2k motor thanks for your opinion anyways.---15lbs on 93 oct. d/d----25+lbs on track with a secondary fuel system either c16 or e/85 haven't talk to the turner about that yet?I don't plan on driving around all day like that an i only drive maybe 5000 miles a year at the most.

you never did mention a motor thats why i said the type of motor/car will limit how much you can make on a log manifold. you said it was a d/d then you said you will only drive maybe 5,000 miles?i never said those numbers cant be had i was just saying ---- trying to drive around a civic with 500hp. if you have ever driven a 500hp civic you will know what i mean.

the post i made is for a top mount i think i stated that.anyone who has a boosted car does not drive around at max psi .i work out of town so my d/d only goes a max of 5000 miles a year but its my d/d.

ok well have fun with that you obviously dont get my point do your top mount and have fun with it. and i was not talking about the horse power for a shitty dd i was talking about the heavy ass clutch,poor idle, shitty bumpy ass suspension, and ---- breaking

i don't need to get your piont an all those issues you stated have nothing to do with my question so please find somewhere else to give your advice . Thank anyways !

well heres some advice stop being a jerk off and asking dumb ass questions. i highly doubt your going to build a 500hp "d/d" if you dont know ---- about how ---- works so you might as well end this thread becuase its going nowhere just like your awsome 500-600 hp car
so in summation ---- off and goto honda-tech they will have all the answers ricers like you need

I don't see how a runner length question is stupid when wanting to fab your own manifold instead of buying one for a grand.Please get out my thread . An listen here you little punk I have been workin on these cars since 98 when you were still in middle school .An if you wanna see some 500 hp d/d go to phearable.net or hdm motorsports .Oh yeah an I work for the NHRA so I think I all the parts covered to make a reliable car .I sent you a pm if this continues i will report you.

then why cant you post in the right section (ex. fabrication section) if you are the almighty god of racing? report me for what exactly? if you have been doinng this for 11 years you should know that runner length is different for every engine, head, purpose, turbo, ect.
you should know this ---- already. you should know to search for an answer douche bag

raysekturbo: Internet Tough Guy.

By the way, raysek, you didn't send him a PM, you made a public visitor message.

"if you dont get out of my thread i will report you thanks an have a nice day."

Learn how an internet forum works. Noob.

I'd also like to point out that when asked what engine you'd be trying to push 500-600HP through a log manifold with, you respond with "What motor did i mention or did you do some jedi mind trick an read my mind ? an you can pull 500 hp out a 2.0 b-series just as well as a s2k motor thanks for your opinion anyways." Exactly, dumbass, you didn't mention a motor. That's why he asked to see how hard it'd be to make that kind of power with a log manifold.

He never asked he assumed first of all . And yes I only use the comp. once in a while so I am not a idiot box junkie .I don't see the problem here I have a question if you can not awnser it why are you on my thread ? I used to come on this forum years ago and it was very helpful but young kids like yourself screw it all up .

Young kids? How old am I? How old is anyone on this forum? You don't know.

And for the 9000th time, he didn't assume anything. Read what you quoted.

here is me asking what you were working with. is that not clear? i was trying to help and your started to be a jerk off and made everyone realize that you are not going to make anything. you are some ricer loser that just talks about what they "are" going to do to thier car. it happens all the time

why is your join date sep 2009? every one says that but i know for a fact hotrex,jd,bdvt, and all the other ogs would tear you a new -------. and funny thing is i was here years ago too the only thing ruining it now is how all the new people (i.e. YOU) ask stupid ------- questions and then gets pisssed when people try to help them.

QFT

------- wrong, through and through. This test shows a gain of 50-70whp on a 250whp motor. That is ------- astonishing, to have a 20-30% power gain with just a header, and only lose 250-300rpm of spool time (And that's without the wrapped header, I'd venture it'd spool faster than the log if it was wrapped).

http://www.full-race.com/articles/Bs...st_writeup.pdf

It's not the manifold's fault it's prone to cracking, it's the builder's/designer's. A true header can be just as dependable. Mine has been going strong for 10,000 miles, and it has much more stress on it than the Honda manifolds do. They are just poorly designed.

It is a stupid question. First of all, you ask the people here. Not that the people here aren't the brightest bulbs in the box, but most homebrew manifolds here are half-assed, and focus more on just getting the exhaust to the turbine than doing so in the most efficient manner. Secondly, you ask someone. So if I tell you 41" is the best primary length, are you going to build it? I sure as ---- hope not. Run the calculations yourself, and figure it out, I did. Lastly, you asked a question that requires a lot of very specific details. You didn't provide a single ------- one.

Now, to contradict most of what I just said. Headers are pretty easy for turbo cars, as test after test has shown that most like a primary length between 16-24". Between this range, it's motor specific, but every motor tested by Bell in his book "Forced Induction Performance Tuning" liked a header in that range. So his advice was to build them at 16", and re-dyno by adding an inch at a time to find out what your motor likes best. He further said that the differences between a 16" header and a 24" header were largely negligible, unless you are in a restricted class, where every 2 tenths of a horsepower count. So since most of us don't have the time, resources, money, or engine bay space to add and test 8 different header configurations, he said just shoot somewhere in that range, and it will be good enough. I personally went right in the middle, and used 20s.

I found a top mount thats a/c compatiable but i search around and a ram horn design is the best bet for what car an motor i am building . but if anyone is interested the guy said seven hundred bucks.my length question refered to i didn't want to defeat the purpose of a top mount by making it to short but thanks for the info guys .

wow, you're an idiot.

did you ever mention what car you are planning on turboing?
if you are indeed trying to go 2.0 b series you better sleeve it,

but you're not, in fact you don't know ---- about turbos.
and 500-600whp in any fwd is just way too ------- much, there aren't many rear drive cars that have 500+whp

---- off your an idiot feel free to migrate to honda-tech you ------- douche bag faggot

no hes not an idiot he knows way more than every one here he is so cool and he is going to gangster as ---- driving around in his 600000hp d/d even though he probably doesnt know the first thing on how an engine works let alone how forced induction works