Guys what do you think about this sheetmetal intake manifold is it worth it?

[dsmrunaway1]

this might sounds stupid cause i really don't post my own thread ever really...but how do u post a new thread ...sry to take off subject.

 

[na90dsm]

go into say engine performance. where they list threads, up top youll see a new thread tab just liek it sayd post reply. there ya go

 

[Stapl3]

and yes with rods and pistons it will produce slightly higher numbers.

Unreal. Stop before I pee on my monitor.

 

[na90dsm]

id pay to see you do that

but your not gonna gain like 100hp from pistons dude. youll get a gain if you do just both but its liek any other mod. every other mod you do before and after it effects it and makes it more effecient. say you run a stock bottom end on a stock motor but used 2g pistons instead of 1g's, youll get a gain but not as much as if you did other mods previous, afterwards.

i dont knwo what to tell you man think what you want.

 

[thekellbeast]

The only way pistons would make any sort of difference is if they changed the compression ratio. Simply getting "pistons" isn't going to do a damn thing.

 

[na90dsm]

yea thats why i said 2g's instead of 1g's. 1g 7:8:1 2g is 8:5:1

 

[Stapl3]

yea thats why i said 2g's instead of 1g's. 1g 7:8:1 2g is 8:5:1

What? You are making no sense at all.

 

[na90dsm]

you need more ocmpression to make more power if you ptu in new pistons. using the same compression wont do shit.

the 95 2g pistons use a 8:5:1 compression ratio vs the 1g stock pistons that use a 7:8:1 compression ratio. you can mate 95 pistons to 1g big rods and its called a big rod/2g bottom end. or 1g/2g bottom end. that setup has held 500whp and then some.

just changing the compression will make a difference but not a lot. barely noticable. the motor will behave more responsive and all but the power gains from pistons alone will only give a few hp. this is without other mods of course. if you have head work, cams, intake, all ths effect that gain and makes it bigger.

 

[92redman]

I don't mean to rain on your parade, but changing your compression ratio won't change volumetric efficiency, only thermal efficiency.

 

[na90dsm]

wouldnt the higher compression lower the volumetric. liek dome pistons vs dish would change right. i dotn knwo that much abotu compression changes

 

[Scrymerr]

wouldnt the higher compression lower the volumetric. liek dome pistons vs dish would change right. i dotn knwo that much abotu compression changes

I think you mean to say that a manifold with a greater vol. efficiency has the POTENTIAL to make more power on a motor that is moving more air (which is not caused by the internals themselves, but is from increasing the boost over the point that stock internals can handle).

I think this whole thing in general could be compared to an exhaust. Take a stock DSM, and throw a 3" turboback on it. It will experience a gain in power. Take a DSM pushing 400hp (and using stock exhaust) and slap the 3" turboback on there; you will see a much larger gain from that exhaust.

Everyone is right when they say pistons wont due anything. They just have the potential to support more power and flow more air, better utilizing the characteristics of a SMIM.

It is all a matter of where your bottleneck in the system is. For most, it is definately not the intake mani.

--Dan

 

[na90dsm]

very very well said. thats beutiful man

yea thats what i was gettin at

 

[coltboostin]

You made a blanket statement that you could gain 20 h/p from THIS manifold by answering the question the way you did (go see post #10 in this thread).

Your answer "yes, and much more" implies you have knowledge of this specific manifold and it's performance characteristics.

I'm sure that I am not the only one that read it that way.

Hal

I definatly was not talking about the manifold in question, that thing looks to be a real POS

 

[BoostinAWD]

Post whores

 

[gixrman]

I don't mean to rain on your parade, but changing your compression ratio won't change volumetric efficiency, only thermal efficiency.

True but higher compression pistons also have better throttle respounce and better fuel mileage. It has been argued and proven that high compression/low boost motors have some advantages. For example a CART 2.5lt v8 running high compression and 3-5 psi. making 900hp. Heat is #1 enemy with a turbo and turning up the boost turns up the heat.

 

[na90dsm]

is this the same theory with the 9:1 4g63 motors. and the 9:1 4g64/63 hybrid motors.

 

[Mirage2LTurbo]

Funny how there are about 2, maybe 3 people in this thread that actually know what their talking about, and the rest of you shoot them down and tell them their wrong. I've read a lot about different designs, and I don't have all the answers, but it's not hard to spot the dumbass(es).

 

[na90dsm]

 

[Stapl3]

You are not one of the 2 or 3.

 

[na90dsm]

nice to see your opinion. how am i a dumbass for askin serious questions

 

[Stapl3]

It's not your questions, rather the false statements you attempt to pass as factual.

 

[na90dsm]

where abouts? show me and ill correct if im wrong.

 

[turbotalon92]

I like this rule

#3 - No Guesses - if you don't know, don't reply - don't spread misinformation (no "I think" or "I guess" or "I've heard").

 

[na90dsm]

there is a thread on here called head flow that someone did specs on how much the 4g63 head flows and all. polk performed all the tests and he did it with different type manifolds as well. non tappered runners, tapered runners, different chamber sizes and tb bores the whoel 9 yards. it showed many differences between the 2 designs and the ones without tappered runners and all didnt flow nearly as much. WARNING: itsa long


http://www.dsmtuners.com/forums/showthread.php?t=53893

thats why i posted with a link to actual information.

 

[turbotalon92]

Originally posted by na90dsm:
wouldnt the higher compression lower the volumetric. liek dome pistons vs dish would change right. i dotn knwo that much abotu compression changes

Sounds like guessing to me

just changing the compression will make a difference but not a lot. barely noticable. the motor will behave more responsive and all but the power gains from pistons alone will only give a few hp. this is without other mods of course. if you have head work, cams, intake, all ths effect that gain and makes it bigger.

Whats "not a lot", how much HP did you gain when you changed your pistons?

the jm mani is good. awesome manifold from what i have heard everywhere.

Guessing again, you heard it was good is not sufficent, you are spreading misinformation. Unless you can point us to some real numbers, don't claim you heard it everywhere?

the ebay manifold is junk. so is everything else on ebay.

So everything on Ebay is junk? I think this guy might be offended to hear you say that?
http://stores.ebay.com/Forced-Performance_W0QQsspagenameZl2QQtZkm

Shall I dig back further in this thread? Please don't just hack away at the keyboard, it really shows when you do.