Bad Vibrations

I know a fair bit about engines, but next to nothing about Mitsubishi engines. My guess is: if this has balance shafts (seems plausible, Mitsu invented that and this is a big four cylinder) something is amiss... shaft out of time, thus amplifying vibrations rather than canceling them? Crazy home brew mounts making vibration worse? I’ve only had 1 vibration related failure in 15 races, that was an alternator mount that I suspect I didn’t tighten. Busting all those parts in a single race ain’t normal.

I don’t know of any (feasible, not lab equipment or engineering-level) ways to measure vibration. It’s always been something I can feel pretty easily when sitting in a seat and revving the engine. Does doing that shake things a lot more than, say, the last 2010 Ford/Nissan/Kia etc you have driven? It shouldn’t. I think something is broken, like a balance shaft issue, or a flywheel coming apart. You try another engine and find you can see the gauges without a blur, and the rear view mirror suddenly is usable, it’s going to be pretty obvious.

I am leaning towards something may be off in the balance shaft or perhaps with the flywheel.  I will say that the car doesn't seem to shake horribly and the gauges are pretty readable.  The mirror is a little shakey, but its a crappy golf cart mirror so who knows.  My thought is high revs may also be an issue for it as some of our drivers are prone to keeping it near red line...  After seeing the engine separated from the transaxle I am curious to see if the flywheel is loose.  Have a team workday planned for end of the month, will likely know more then. Thank you all for your thoughts..

Monty

You seem focused on engine vibration. Have you eliminated driveline vibration as a cause? CV joints, axles...

--bb

Short answer, yes.