Custom Intake Manifold

[2.8/3400 1985 Camaro]

If there's two things I never got about the 60/6 its that GM gave all the love to the fwd cars when all they had to do was change the pistons to a lower dish to give the RWD cars a much needed performance boost, esp considering firebirds and camaros are GMs 2nd notch in the performance sector after the corvette.....the other being the 3.4 intake design.....they could have made it so much better...it would actually be relatively easy to adapt the 3.4 rwd UIM to a dual TB setup, and give it more volume, I would probably do it if I weren't planning to go hybrid.

[ericjon262]

yeah, but long bent up runners are no good...

[2.8/3400 1985 Camaro]

Well long runners aren't necessarily bad, I can never remember which gives more torque and which gives more hp, but I'm wanting to say that longer runners give more torque, while shorter runners and more plenum volume give more top end power. Headers have the same effect, but once again, can't remember if longer is more torque or shorter is....but I think its longer=more torque.

[ericjon262]

did I mention the neck that leads to the plenum is super tiny too?

[ericjon262]

whoops you're right, I'm using new math...

the 3x00 intakes also eliminate more than half of the runner, have much more plenum, and larger ports.

[2.8/3400 1985 Camaro]

the owner claimed it made a huge improvement, but I don't remember anything measurable.



to this, I dissagee 110%, a 300* bend in an intake manifold like that is never good.

[ATTACH=CONFIG]5530[/ATTACH]

I'ts a 180* bend, not 300....the problem is more the sharpness of it and the small ports, 3x00s make the bend/transition much more smoothly

[ericjon262]

do gen 1 intakes bolt to gen 2 heads?

[ericjon262]

But if it performs, who the FFFF cares
http://ratednfornasty.wordpress.com/...-street-racer/

this is true, but at the same time, if ugly was fast, these would suck

http://www.marcellamanifolds.net/images/Images.html

[ericjon262]

Would love to know how much that intake on the fiero is flowing...or dyno before and after results or 1/4 times or something.

the owner claimed it made a huge improvement, but I don't remember anything measurable.

Oh and I'm not saying the stock intakes are good, but they aren't terrible

to this, I dissagee 110%, a 300* bend in an intake manifold like that is never good.

[2.8/3400 1985 Camaro]

I kind of agree since the biggest bottleneck on a gen 1 is the heads, aluminum heads could better make use of that flow, the gen 3 manifolds are a much better design to begin with though, so I guess it winds up about the same gain in the end...

[bob442]

But if it performs, who the FFFF cares

http://ratednfornasty.wordpress.com/2008/05/06/guide-to-how-to-be-a-street-racer/

[ericjon262]

hmm.... why not on a gen3? they can use the extra airflow capabilities better than a gen1 or 2...

well, the gen 3's have way better intakes available to them already, for alot less work input, and for me, it's also a looks thing, this looks better to me on a gen 1 than a 3, I just don't think it would look right, I kinda like the "superram" look of the 3500 intake.

[2.8/3400 1985 Camaro]

I've thought about dual Tbs as well, would be easier than ITBs, and I plan to twincharge eventually, which makes ITBs a no go. Would love to know how much that intake on the fiero is flowing...or dyno before and after results or 1/4 times or something.
Oh and I'm not saying the stock intakes are good, but they aren't terrible, or the biggest bottleneck, biggest bottle neck is the stock iron heads, also the 3.4 intake on camaros, that intake is a poor design, falls on its face at 5k, 2.8 and 3.1 rwd intakes can go to about 6k with some work to them. But the fwd stuff takes the cake of course....can't wait to hybrid swap, I've decided to put my car on hold atm, it just needs to much crap and I have no job or money atm, going to save up and fix everything at once and build it the way I've been wanting to, between the small cracks I discovered on my intake manifolds and the bad piston rings, I may as well go all out on the thing.....just wish I could find a gd job, going to cost me $2k probably just to get my engine back to good order, and another $1k for the rest of the car.../sigh
And the part I don't get is that it ran great for 2 weeks till the fuel pump died, then the new pump brought it back, but with a terrible idle(but revs fine?) and something loose internally, and a good bit of oil on the plugs, top end is newly rebuilt, but the bottom end has 160k, and of course I discovered the cracks on the intake manifolds when I had to reseal it after the rebuild(overlooked that I had to use RTV as an actual gasket because of the LIM gasket design......

[robertisaar]

hmm.... why not on a gen3? they can use the extra airflow capabilities better than a gen1 or 2...

[ericjon262]

i was kind of wondering about doing a dual intake like this, but was scared to ask.
the Q4 cover is a neet idea though...

on an iron head motor, I'd be all for it, but I'm not sure there would be enough benefit with it on a gen III motor.