On 15/02/2008, at 1:09 AM, WSpohn4@aol.com wrote:
> I doubt you had a piston problem due to RPM, Eric. There are lots
> of people that rev MG engines much higher than you do without
> incident. I'd look to something else. Were you getting
> detonation? I'd worry about timing and mixture.
>
Well it looks like the issue was caused by a broken top ring (the
rings on the JE pistons are pretty fine) - and using AVGAS with the
high compression generally mean no detonation. I will try and take
some shots but the damage was pretty certainly done by the broken ring.
As far as over revving - on the track I take that thing regularly up
to 5500 to 6000+ revs but can remember the odd "issue" (missed gear
related, or high-speed "off"... ) where it has gone well over that on
a couple of occasions.
I was told she could handle 7000 revs but never really found any
advantage going much over 5500 - it was only the odd error that would
see the needle bounce that far past the old redline.
Anyway - I have a lead for some flat-tops and I will be chasing that
on Friday.
Thanks,
Eric
'68MGB MkII
Adelaide, South Australia
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