Overspeed motor now Nocompression....

[DOOUGIEHOUSER]

I was doing about 90 went to go grab 4th and found second by accident. No compression instantly. Pulled Valve cover, asuming it was one of the timing chains, and everyting looks perfect! When you turn it over there is virtually no load on the starter. Turns over very fast? Any ideas fellas??...TIA...DJ

[DOOUGIEHOUSER]

[JKRIT]

'03 525i Sapphire Blu/Grey, SP, Nav
'02 325it Orient Blu./Grey, SP, Nav
'98 323is Arctic Sil./Blk, SP
'95 M3 Cosmos Blk./Blk

[DOOUGIEHOUSER]

[DOOUGIEHOUSER]

Not a f-clue fellas, No compression in ALL cylionders timing chains fine, everything looks perfect!...WTF??

[JKRIT]

If you let out the clutch in 2nd gear at 90 MPH, then you have a serious over-rev condition. This means the valves "float" or stay open instead of following the cam lobes. When a valve stays open when it shouldn't be, the piston comes up and hits it, bending the valve. A bent valve won't seal any more, so you don't get any compression when you turn the engine over. You can run a simple compression test to confirm. As I said before: probably bent valves in every cylinder. If confirmed, then probably the cheapest way out is to find a used cylinder head assembly, or maybe a complete used engine.
'03 525i Sapphire Blu/Grey, SP, Nav
'02 325it Orient Blu./Grey, SP, Nav
'98 323is Arctic Sil./Blk, SP
'95 M3 Cosmos Blk./Blk

[DOOUGIEHOUSER]

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