Plastic intake manifold/Phenolic Intake Spacers

kimokalihi · Post by **kimokalihi** » Fri Aug 07, 2009 11:58 pm

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?

kimokalihi · Post by **kimokalihi** » Sat Aug 08, 2009 2:05 am

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

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

kimokalihi · Post by **kimokalihi** » Sat Aug 08, 2009 2:51 am

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.

ericem · Post by **ericem** » Sat Aug 08, 2009 6:08 am

screw plastic manifolds. The spacers should work just fine.

Airgne · Post by **Airgne** » Sat Aug 08, 2009 6:58 am

plastic manifold get heatsoak more than the metal ones.

kimokalihi · Post by **kimokalihi** » Sat Aug 08, 2009 12:55 pm

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?

PhyrraM · Post by **PhyrraM** » Sat Aug 08, 2009 2:56 pm

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

kimokalihi · Post by **kimokalihi** » Sat Aug 08, 2009 3:09 pm

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.

gijonas · Post by **gijonas** » Sat Aug 08, 2009 4:11 pm

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.

kimokalihi · Post by **kimokalihi** » Sat Aug 08, 2009 11:36 pm

Funny stuff.

gijonas · Post by **gijonas** » Sun Aug 09, 2009 12:12 am

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

kimokalihi · Post by **kimokalihi** » Sun Aug 09, 2009 1:07 am

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.

epicfail · Post by **epicfail** » Sun Aug 09, 2009 8:01 pm

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.

gijonas · Post by **gijonas** » Sun Aug 09, 2009 8:13 pm

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

Post by **Legacy777** » Sun Aug 09, 2009 10:07 pm

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.

RJ93SS · Post by **RJ93SS** » Mon Aug 10, 2009 4:53 am

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...

evolutionmovement · Post by **evolutionmovement** » Mon Aug 10, 2009 5:05 am

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.

kimokalihi · Post by **kimokalihi** » Mon Aug 10, 2009 3:27 pm

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.

kimokalihi · Post by **kimokalihi** » Mon Aug 10, 2009 3:32 pm

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?

gijonas · Post by **gijonas** » Mon Aug 10, 2009 4:45 pm

Those look right.

evolutionmovement · Post by **evolutionmovement** » Mon Aug 10, 2009 4:55 pm

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

PhyrraM · Post by **PhyrraM** » Mon Aug 10, 2009 9:07 pm

Those would be the correct spacers.

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

kimokalihi · Post by **kimokalihi** » Tue Aug 11, 2009 12:52 am

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

93forestpearl · Post by **93forestpearl** » Tue Aug 11, 2009 2:43 am

They're about ten minutes part, lol.

kimokalihi · Post by **kimokalihi** » Tue Aug 11, 2009 4:06 pm

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

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Plastic intake manifold/Phenolic Intake Spacers

Plastic intake manifold/Phenolic Intake Spacers