OkeyDan
New member
- Joined
- May 29, 2017
- Location
- Netherlands
Hi,
I blew my engine and it would be awesome if we could put our heads together to do a bit of an analysis on why it happened.
Story: I've been running 1.5 bar, 21.7 psi boost for 6 months now with some Chinese T3 turbo, IPD turbo cam and using Megasquirt2 . Was running great, fun was had. Then the day came I had the brilliant idea to up my rev limiter a bit, until then I had it set to a conservative 6000 rpm but made the change to 6400, 200 more then stock still not shocking one would think.
Did a couple of pulls and all seem great, drove home for about half an hour (still going into boost every now and then) and only while idling in front of a traffic light I noticed it wasn't running that great. Turned out, smoke was poring from my breather and doing a compression test showed 5 bar compression on cyl 4, not good.
Pulled the engine out of the car and got it apart.
Here are some pictures https://imgur.com/a/iWHotiM sorry for the bad quality.
As you can see the pieces of piston between the rings are broken. The 1st ring is still in one piece, the 2nd and the oil scraper are damaged. Below the oil scraper is even a bit molten, you can see the molten pieces of piston on the ground next to the broken pieces of piston and rings.
The top of all the pistons look immaculate, same goes for the bores, not a scratch, you can still see the hone marks.
What do you think?
- Knock
- AFR
- Simply to much boost for a high mile engine (400000 km, 250000 miles)
- Something else
tldr: Blew up my engine, come take a look at my piston and give your opinion on why it went wrong.
I blew my engine and it would be awesome if we could put our heads together to do a bit of an analysis on why it happened.
Story: I've been running 1.5 bar, 21.7 psi boost for 6 months now with some Chinese T3 turbo, IPD turbo cam and using Megasquirt2 . Was running great, fun was had. Then the day came I had the brilliant idea to up my rev limiter a bit, until then I had it set to a conservative 6000 rpm but made the change to 6400, 200 more then stock still not shocking one would think.
Did a couple of pulls and all seem great, drove home for about half an hour (still going into boost every now and then) and only while idling in front of a traffic light I noticed it wasn't running that great. Turned out, smoke was poring from my breather and doing a compression test showed 5 bar compression on cyl 4, not good.
Pulled the engine out of the car and got it apart.
Here are some pictures https://imgur.com/a/iWHotiM sorry for the bad quality.
As you can see the pieces of piston between the rings are broken. The 1st ring is still in one piece, the 2nd and the oil scraper are damaged. Below the oil scraper is even a bit molten, you can see the molten pieces of piston on the ground next to the broken pieces of piston and rings.
The top of all the pistons look immaculate, same goes for the bores, not a scratch, you can still see the hone marks.
What do you think?
- Knock
- AFR
- Simply to much boost for a high mile engine (400000 km, 250000 miles)
- Something else
tldr: Blew up my engine, come take a look at my piston and give your opinion on why it went wrong.
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