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Which year(s)/model(s) have the new plastic intake manifolds?

I was thinking about buying those Grimmspeed intake plenum spacers that are supposed to substantially reduce heat transfer form the heads to intake manifold. Then I thought, maybe I could just use a plastic manifold and that might work similarly.

I've seen someone on here with the plastic manifold.

What are your thoughts on the plastic manifold and the phenolic spacers?

Here's a cool article on the phenolic intake spacers.

http://autospeed.com/cms/A_110474/article.html

Alright, I orderd the 8mm thick grimmspeed phenolic spacers. Hopefully there's no clearance issues.

It says 02-07 WRX/STi, will it work on 97JDM DOHC forester heads?

I guess I'll find out.

screw plastic manifolds. The spacers should work just fine.

plastic manifold get heatsoak more than the metal ones.

Seriously? How is that? I thought plastic was an insulator and a poor heat conductor therefore, wouldn't it resist the heat more?

Why would they go to plastic intake manifolds then?

Those won't work. Your motor is a phase 1 with the manifold mounting bolts in-line. The EJ205 has them staggered.

Great. I was pumped on those too. Now what do I do? They don't make them for phase 1 motors? Everything is WRX this and WRX that...I swear.

Now what do I do?

Now you need the manifold to match the spacers,oh and the heads to match the manifold,might as well get a bunch of forged internals and a vf-11 while your at it.Perhaps a 6MT? I hear Wolf makes a great standalone you may need to think about as well.

Funny stuff.

...damnit
I meant vf-39,my joke sucked

Yeah that part did confuse me. I was thinking, I already have 2 of them and why would I use them on that kind of build lol.

I've seen spacers w/ the mounting holes in-line to fit our manifolds. Can't remember where, though. If I find it, I'll post a link here.

Shouldnt be too hard of a thing to make.Just need to source some non heat conducting material and cut out the spacers.

Airgne wrote:plastic manifold get heatsoak more than the metal ones.

Not really.

There's more mass in the metal manifolds, therefore you will have to input more heat into it, and alternately, you will need more to cool them.

The plastic manifold will not retain much heat, and therefore any changes in actual intake charge air temps will not change as much compared to the metal manifolds.

those plastic manifolds are going to suck down the road. i can already see hairline fractures, cracks, leaks, nipples breaking.

maybe even some of the desert guys having them melt on race day...

What type of plastic is it? Might be weldable. As for nipples breaking ... they apparently don't grow back. I knew a kid who, on a bet when high, pierced his nipples with safety pins. Pissed off a little while later and high again, he ripped them out. One took a nipple with it. As of 3 years later, it hadn't grown back. If he's still alive today, I'd bet it's still MIA. Don't do drugs, kids, men may not need nipples, but we look a lot funnier without them.

Sick.

I know what a bitch it is to break nipples...plastic nipples. I broke 2 of them off that stupid EJ22T coolant filler tank. It's fucking worthless once one snaps off, there's nothing you can do. At least I couldn't think of anything to fix it with. It was old and snapped off sooo easily.

I found phase 1 spacers from grimmspeed.

Will these fit?

Applications:
Impreza '98 2.5L N/A Phase 1 engines
Legacy '96-'99 2.5L N/A Phase 1 engines

http://www.grimmspeed.com/catalog/produ ... q6koj99vt7

Does it matter that it says N/A? Aren't the heads the same for turbo and non turbo?

Those look right.

If it's weldable plastic, you could weld them back on, but you'd have to carefully redrill the holes.

Those would be the correct spacers.

You might have to port match them, but that should be pretty easy.

Grimmspeed says those are the right ones for phase 1 heads.

Awesome. I'm ordering them as soon as I get a response from modern automotive performance. They don't list them on the MAPerformance website but they said they can get me anything grimmspeed sells.

Here's the MAPerformance site if anyone wants to buy the spacers, just email them about them.

http://www.maperformance.com/grimmspeed/index2.html

They're about ten minutes part, lol.

I don't understand what you're saying. ¿Ten minutes part?