Blew the motor! Rebuild time.
06-25-2009, 09:19 PM
#1
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Blew the motor! Rebuild time.
Well, my motor blew today during a little cruise at lunch. My setup is in my sig..... 13 PSI on a SR20DET T25, stock 1.8L motor, megasquirt running a very conservative timming map (avg. of about 3 degrees more than DIY's base).
It blew when i was rolling into the throttle in first, maybe 4 or 5k RPMS, it had a sudden lurch, knock light lit up and stayed lit, I shifted into second and heard the MASSIVE tick.
This afternoon I pulled the valve cover off and everything looks normal, I drained the oil and strained it with a paint filter.... and amazingly it was perfectly clean!!!! So its not bearings. I'm kinda stumped. The motor will be out soon pending the weather holding out. Ill keep this updated.
I am just amazed I blew a motor with a t25 and a decent tune. It had 135k on it and even (but low) compression. It dynoed at 98 rwhp stock so it wasnt the most healthy motor.
Enough ranting, sorry for the horrible grammar.
It blew when i was rolling into the throttle in first, maybe 4 or 5k RPMS, it had a sudden lurch, knock light lit up and stayed lit, I shifted into second and heard the MASSIVE tick.
This afternoon I pulled the valve cover off and everything looks normal, I drained the oil and strained it with a paint filter.... and amazingly it was perfectly clean!!!! So its not bearings. I'm kinda stumped. The motor will be out soon pending the weather holding out. Ill keep this updated.
I am just amazed I blew a motor with a t25 and a decent tune. It had 135k on it and even (but low) compression. It dynoed at 98 rwhp stock so it wasnt the most healthy motor.
Enough ranting, sorry for the horrible grammar.
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06-26-2009, 09:06 AM
#9
Boost Pope
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Manifold, yes. MS and wiring harness, no. Your 1.6 wiring, sensors, and computer will work just fine on the 1.8 engine. Upgrading the MS to an MS2 would be optional if you went with an NB block & head.
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06-26-2009, 09:20 AM
#12
Tour de Franzia
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then either get a job or start sucking. I'd rather have a built 1.6 than a stock 1.8 though.
Just ****** up a blow bottom 99 motor and go from there. I had a 28k mile motor for mine and I'm happy I opened it up and went with forged guts.
Just ****** up a blow bottom 99 motor and go from there. I had a 28k mile motor for mine and I'm happy I opened it up and went with forged guts.
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06-26-2009, 09:49 AM
#13
A weak motor is a weak motor. I put a freshened cylinder head on a very tired bottom end for an ITA Miata. That head made the car a full 2 seconds a lap quicker. But I knew that extra (compression) power was only going to stress the bottom end. Sure enough, 3 laps to go in the enduro (our last race of the weekend), while running in second place, the engine spun a bearing. And that was w/o boost.
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06-26-2009, 07:58 PM
#16
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3000 miles.... was gunna change the oil this weekend. Its still raining here, so the motor isnt out yet.
Compression test results (No spark plugs, throttle wide open, cold motor)...
175, 50, 175, 125
Something is up....
It was about 175-180 all around when i installed the turbo.
Compression test results (No spark plugs, throttle wide open, cold motor)...
175, 50, 175, 125
Something is up....
It was about 175-180 all around when i installed the turbo.
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