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Old 02-29-2008, 12:48 AM   #1
Twiztidunreal
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Default Got my compression test, now how to rebuild?

well my Hybrid motor made it about 17k with 300+whp till it started to blow out crazy amounts of oil..
did a compression check,
DF-165 PF- 165
DR- 90 PR- 190?(carbon build up maybe?)

guessing rings or something to do with the piston(ringland maybe?)

so im looking at a set of Wiseco pistons, 100mm bore keeping, my hybrid 9:1 CR..
should those hold up for the 400-475whp i am looking for??

i also came across a set of DPR stg 3 sti cams for a decent price that i have been waiting on dropping in till i needed to pull the motor again..
i know i need springs and retainers to run these cams, will the brian crower set be well enough??
will i be able to my stock valve buckets with these cams? i know mine are shimless already..

i am also looking to upgrade my td05-18g 7cm to a 7cm 50 trim,
with the set up from above, im already running an EWG, does this seem like a 400-450whp set up?
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Old 02-29-2008, 08:12 AM   #2
jigga
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what about your transmission?
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Old 02-29-2008, 08:41 AM   #3
Twiztidunreal
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Originally Posted by jigga View Post
what about your transmission?
valve body and TC are in the works as well..
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Old 02-29-2008, 01:11 PM   #4
2ndGearFling
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18g wont be enough to get 400-450. It'll be blowing hot air. Go with a fpgreen or red.
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Old 02-29-2008, 06:14 PM   #5
Twiztidunreal
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yeah, thats what i was going to do is upgrade my 18g to a 50 trim(green) but keep the 7cm side since i am EWG anyways and i need quicker spool for the auto, not more top end from a 8cm housing
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Old 03-02-2008, 01:46 PM   #6
JMK508
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any reason why you think your motor died so soon?
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Old 03-02-2008, 10:26 PM   #7
Twiztidunreal
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well, my tuner was running a decent amount of timing, with the higher compression, and an 18g pushing 19psi..
i kept the plugs, 3 of them were white, the dead cyc was normal looking..
i will try to get some pics up here soon...

so with the compression that low, is it a for sure thing its a piston/ringland?
or could it be a valve or something else, the motor idles fine, just massive oil blow by..
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Old 03-03-2008, 08:16 PM   #8
SubieStylez
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If theres that much blow by like you say my guess would be a piston issue. If it just wasn't holding compression I would say check the heads and make sure the valves are seating correctly.
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Old 03-03-2008, 11:41 PM   #9
Twiztidunreal
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Originally Posted by SubieStylez View Post
If theres that much blow by like you say my guess would be a piston issue. If it just wasn't holding compression I would say check the heads and make sure the valves are seating correctly.
thats what i thought too, as well as i have the smoke coming out of my filler cap and if i unplug any of my catch can lines...
just wanted to make sure before i go dropping the cash there it dont belong..
so forged pistons here i come...
going with 100mm will be better right? so the machine shop can make the block fit the pistons?
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Old 03-04-2008, 05:08 PM   #10
slowmike
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You might want to find some pistons that will lower the CR back to stock specs. It will be easier to tune and less prone to detonation.
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