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Engine Blew

1.9K views 24 replies 13 participants last post by  Raven  
#1 · (Edited)
Well it happened...

Here's the compression test:

Cylinder 1: 120psi
Cylinder 2: 160 psi
Cylinder 3: 100 psi
Cylinder 4: 80 psi

Oil coming up out of cylinders past the spark plugs and charge pipes filled with oil aswell. Pouring out white smoke from exhaust.

I was running an Alpine Entry Level kit with upgraded FMIC with boost levels under 10 psi. I am very disapointed. :3_saai:

Need to rebuild now-i'm open to suggestions/input but so far i'm considering:

-forged pistons
-1.8 pisons and rods
-stock internals with decomp. plate

I will remain under 300 whp b/c of my transmission but I want to build the engine as reliable as possible so that I wont have to do this again....*sigh*
 
#4 ·
that's bad :( i wouldn't be ready to rebuild if that would happen to me now.. but my car isn't driving too, anyways..
 
#5 ·
I know when I plan on going F/I, I plan on using Ripps Pistons 9.5:1 compression ratio(possibly getting a custom lower compression set done) and having Pauter make some custom rods for me... if you're looking to build out an engine thats what i would recommend... But I'm no F/I pro, might wanna talk to one of them...
 
#7 · (Edited)
Holy crap dude,
Your compression is all over the map. what the heck happened there?
Did your rings go out on you? did you warp the head??
Cyl # 2 seems to be the only one that held up to that abuse. I would seriously look into your tune and such. You should have had no problem with 10 psi with a FMIC and the correct tune. did you ever get your piggyback reflashed from alpine for the FMIC and 10 psi??
 
#11 · (Edited)
#12 ·
It doesn't matter what you build now, nothing will survive the abuse your tune is giving. You need to figure out what the problem is before you go and dump more money into another motor, which will blow too.

I've been running 15psi on a completely stock motor for a year now. 10psi was nothing.

Usually if all the cylinders have low compression like that, then there was something seriously wrong. If it was mild, then only one piston/ring would go out at a time.
 
#17 ·
I bet you it's not the rings. Take it apart and you will find that it's the ringlands. The pistons are cracked near the intake side. It's typical.
 
#21 ·
I seem to remember warning you against turning up the boost on the Entry Level Kit without a wideband to monitor things. The original Entry Level Unichip tune was only good for a max of 9psi. I also seem to remember telling you quite a few times that I would reflash your chip for free. No matter what form of tuning you have you MUST ALWAYS keep tabs on your engine. I myself am currently running 15psi on a GT2876R turbo and pushing close to 340WTQ/360WHP on the stock decompressed block with zero problems.
In the future you may want to think about upgrading to the SMT-6 Tuner package so that any local shop can do the tune for you. In the meantime send me you chip and I'll reflash it for the the 290cc intercooled program.
 
#24 · (Edited)
Dave, I am 120% sure that you told me the unichip tune was good for up to 12 psi with the addition of the intercooler. Please do not try to make it sound like I pushed the kit over its limits because I did not. I could make a big deal about this and dig up the old email telling me that the tune was good for 12 psi but im not going to. Theres just no point. Im not trying to blame Alpine for any of this. I love the kit and have had tons of fun with it. I have had good relations with You and Alpine and I would like it to stay that way. So lets just focus on the future and we can make sure this doesnt happen again and in the process make some nice numbers.
 
#25 ·
i do think the flashes are almost identical if not identical at all. i mean it's just the map that continues up to the MAP sensor abilities, it could be different for stock and decompressed... but why this "up to" question is brought? does it just stop injecting at 9.1psi or what?