died on the dyno. your veiws please

[LJ851]

what will the brass fleck indicate?

A rod bearing that is gone. Your oil will look like black metallic paint with the metallic being brass/gold color.

[329jay]

thanks dude. ill prob go and have a look this weekend. what will the brass fleck indicate?

[LJ851]

Forgot say i'm sorry for your loss, that sucks. Start with easy stuff like nando said, leakdown and pull the valve cover to look for damage. Drain the oil and look for chunks and or brass flecks. (when you feel like going back out to the garage of course)

[329jay]

the operator was recomended and had done e30 m20's before. i havent done a leakdown. i just chucked it in the garage and tried to forget about it

[nando]

try a leakdown?

[329jay]

it was a hot day and he was doing a lot of runs. i did wonder if he had over heated it. i never saw the temp gauge but i do have one of those temp stickers on the back of the head. ill have to get a mirror in behind the head to see what temp it went to. the rockers are good. what should it be looking for on strip down?

[nando]

broken rocker? floated valve?

it would have had to be a lot of timing for a big pre-detonation event. M20s are generally knock insensitive, unless they're boosted to hell and back.

[LJ851]

It depends on what failed. Way too much timing causing mega detonation is about all he could do to hurt the engine.Or overheat it. I have dyno tuned hundreds of motorcycles and only a couple have failed on the dyno, all non related to tuning. Disassembly will show the failure and you can go from there.


edit: A competent dyno operator will not hurt your ride, is this tuner known as competent?

[329jay]

took my 2.9 m20 e30 to the dyno for mapping. strong engine. rebuilt about 2000miles. good compression tested on the day of the dyno. new oil and filters. he did the fuel mapping ok then went on to play with the timing
on the last run as the revs climbed it stuttered, like a big pause and carried on reving.

it now has a death rattle from the bottom end and the compression is lower. one has gone down 40psi.

injectors were checked and they are fine. plug leads were crap and he suggested they may have caused the cut out.

did the dyno opperator kill the engine?