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Old 10-31-2002, 11:51 PM   #1
Tattoo Collector
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Member#: 19364
Join Date: May 2002
Location: Pennsylvania
Vehicle:
1998 Impreza RS
Black Mica Pearl

Default Everyone......Look.........Pistons!!!!!

I guess I made you look. Now that I have your attention. I need to know everywhere I can find higher compression pistons for my car. I emailed ION so they're getting back to me and JE only makes lowered compression ones unless I want to get custom ones. I don't want to pay crazy amounts of money, but I do realize it's going to cost me. If anybody has info on where to get these things, please let me know. Maybe if you give me a good lead, I'll give you a ride when I get it done.........


Planned Mods:
-Higher compression pistons
-Lightweight connecting rods (need somewhere to get these too)
-I am balancing the crank myself
-I am doing 2 angle valve job on the valves and 3 in the head (myself)
-port and polish
-Fidanza 9.5 lb flywheel
-Vitek stage 4 clutch (or cobb, haven't decided)
-STI motor & tranny mounts
-ProECM
-Extrude Hone Intake (possibly)
-New fuel pump and injectors if I need it



Can anyone think of anything else that I might need to do, or should do while I have the engine apart?

Thanks.

Nathan
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Old 11-01-2002, 01:15 AM   #2
dcoty
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Join Date: Dec 2000
Location: montreal quebec
Vehicle:
01 V7 GC/R32 sky

Default

Id be interested in purchasing these pistons with you as well since you are on your way to where I want to be. Heres my mods:

borla headers
randon tec hi flow cat
strommung cat back
cobb cai
unorthodox ud pulley
custom ported and polished cylinder heads
cobb racer camshafts
custom ported and polished intake manifold
cobb springs
cobb retainers
custom matched vavles
ACT street clutch
lightend stock flywheel (14 lbs)
upgraded fuel pump
STi motor mounts
STi tranny mounts

I have the unichip and rev module to do the fuel timing and raise my redline to 7,500 rpm, it will be installed on the 11th this month.

Pistons are my next wish, but not anytime soon, however, i would still like to find some. I also need new fuel injectors to be on the safe side.

Nice mod list, let me know if you find anything! Did you try J&E pistons? My brother has a set for his turbo audi 90, I dont know if they offer for us. Anyway, good luck!

Dan
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Old 11-01-2002, 02:47 AM   #3
HndaTch627
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Location: Carol Stream, IL
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'09 Concours 14 ABS Black

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TWE has custom forge 11.0:1 pistons.

jeremy
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Old 11-01-2002, 09:38 AM   #4
PeterJ
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2002 impreza RS

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Paeco industries http://www.paeco.com These guys do all sorts of things for 4 cylinder engines. You can just about get any compression you want. I don't think they list all prices on the site but you can ask for a catalog, which has loads of more information anyway.
Edit: piston sets $380
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Old 11-01-2002, 10:34 AM   #5
EJ25
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Location: Canada... bent and broken 2000RS Rally
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On the side, thin metal gaskets are a cheap way to raise your compression a bit... I am interested in hight compression pistons as well. 11:1 at least... maybe 12:1 if there is enough clearance...
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Old 11-01-2002, 01:19 PM   #6
stimpy
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Cobb Tuning has the option to have them do a fully built NA block with 11:1 compression. You might want to try and give them a ring.

-Jon
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Old 11-01-2002, 01:43 PM   #7
Pinochle
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pat + nat

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Sounds great! Lemme know when you find something! I'd totally be interested in checking them out!
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Old 11-01-2002, 06:10 PM   #8
moogooob
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00RS -Dumb all over
A little ugly on the side

Default educate me please.

Just for a comparison to demonstrate the effect of different pistons.
Say we had identical cars with the exception of compresion ratios(due to different pistons). What would be the characteristics of each car if they were:
8:1
9:1
10:1
11:1
12:1
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Old 11-01-2002, 09:56 PM   #9
obyone
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Yes, but what octane would you need to run to keep your engine from destroying itself?
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Old 11-02-2002, 10:50 AM   #10
Pinochle
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pat + nat

Default Re: educate me please.

Quote:
Originally posted by moogooob
Just for a comparison to demonstrate the effect of different pistons.
Say we had identical cars with the exception of compresion ratios(due to different pistons). What would be the characteristics of each car if they were:
8:1
9:1
10:1
11:1
12:1
This is a great question. Anyone want to tackle this one? I'm too tired. Haha!
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Old 11-04-2002, 10:53 AM   #11
stimpy
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If you search back a ways, there was a compression ratio vs boost thread done. While it is forced induction, a lot of the same principles may apply. From what I recall, anything much over 11:1 on the backside of the bell curve and isn't useful.

-Jon
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Old 11-04-2002, 01:16 PM   #12
MY99 2.5GT
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I know 14:1 compression in a bored 427 makes a real loud cracking pop exhaust tone that is unparalleled!!

While you have the engine opened you could bore and stroke it drop compression to 8:1 and prep the heads for boost

Youve heard the saying:

High Compression is Cool, Nitrous is Nice, but Boost Blows them all away.
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Old 11-04-2002, 01:34 PM   #13
MY99 2.5GT
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Okay so that was a pretty cheesy saying. I didn't invent it though. I saw it on some guys T-shirt at an NHRA DragRace Event. It actually said "High Compression is Cool, Nitrous is Nice, But I'll Take Mine Blown".

I have to confess my uncle's 69 Camaro with a bored 427 with 14:1s sounds so viscous and makes pretty good power. However my dad's Camaro with Blown 383 stroker makes a nice whine and easily makes more power then the 427. Cost wise parts are so widely available for these big V8 engines and the power gains from doing high compression compared to the low cost of what actually needs to be replaced and work that needs to be done to prep for hi comp it seems pretty favorable to go that route over supercharging.

However what most people have found is that the gains acheived by fully prepping a 4 cylinder engine for hi compression NA use and increasing displacement isn't worth the money and time when low boost options are much less hastle and cost competatively and will provide better end result.

Just Opinions

Brad
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Old 11-04-2002, 09:37 PM   #14
Poppa smurf
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(nods in agreement with MY99 2.5GT) if cost is any concern at all you may want to do a price breakdown if possible. I did and was quite shocked at the dollar to HP ratio.
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