Originally Posted by
stefan
Hmm, I have data of about 15 Picco based .12 engines in my little book, all engines I timed myself and the only Picco based crank that had a different timing was an old Collari engine. All the other have 200 degrees crank timing (40 -60).
Are you sure you are measuring correctly? How do you set the degree wheel to zero?
I measured these engines: IDM EVO3 (4 engines), LRP Spec4(3 engines), LRP Spec3, Picco EVO3 Edo, Mega ZX12 DSII (2 engines), Collari Inotech and an old Picco EVO.
I also have a few Plus 12-3 ST and SCT on record and the crank duration of the stock engines is usually 210 degrees. Is that also what you measured?
i set the piston on TDC. i set the gauge so that it is directly in the middle of the rod float. then i move to BDC, the rod is absolutely straight up and down. either way if i was out 3 or 5 deg i would still come up with the same duration, just different opening closing deg. the tuned one i actually did measure at 207 deg duration. the rest EVO 3 IDM and std JL were 205. i measured my murnan 353 at 215, and the plus 12 3sct at 212 .
but its cool. i am playing at the moment. so the IDM crank i opened the closing side to 212 duration. its old and had a lot of use. but if it still Idles and runs fine, then i will do to all my JL's. of course i will do a consumption test, but wont be totally acurate, as the engine is quite tired.