I had a post on here a week or so ago about a blaster with msd tl #4270. I have a 5mm stroker crank and could not get it to run.. Thought it was the tl because of the backfiring issue. switched to stock ignition and still backfiring. took a quick look and marked tdc for each cylinder and they did not appear to be 180 deg apart. Is this a common repair on a stroker crank.
Backfiring caused by twisted crank???
- Thread starter coldblaster
- Start date
#ZERO
Beach Bum
- Location
- Florida - U.S.A.
It depends on who manufactured your stroker crankshaft and if its been rebuilt before.
I would have it true and welded by CrankWorks to keep this from happening again.
I would have it true and welded by CrankWorks to keep this from happening again.
SUPERTUNE
Race Gas Rules
- Location
- Clearwater Fl.
I have 2 dial indicators I can put in at the same time to check for this...I have never had this problem with any of my Crankworks strokers. This will not be the tell all fix if the rod is bent, then I'd pull the head or run solder check on the squish to see if the squish is the same.
I also marked tdc and hooked it up to the timing light. The front cylinder was the one I was setting my timing to. When I checked the timing on the pto cyl it was way out. I think this explains my timing issues and why it was backfiring in the rear cylinder. Timing in front would be at 28 deg and the rear would be at 5 deg, or possibly even retarded. last night I put stock ignition in it and am debating leaving it in or switching back to the TL 4270. It turns out there was no problem with th msd it after all. But with all the backfiring I have damaged 10 or so teeth on the msd flywheel. Should I go back to msd or get everything together and running well and switch to msd in the winter? Supertune?