Had mine in my 2v for about 4 years and guess what ? I had no drama with them.
Then I built a 4V motor and just didn't use them. No real reason not to use them other than the new motor SOUNDED tough enough without the gear drive.
I pulled my JP Performance gear drive out last year.
It was in the engine for 2 years. The faces on the gears were cactus. Lost of pitting......and where were those little bits of metal floating in my engine?
Yes they minimise cam timing changes due no chain stretch, but that's it IMO.
From a gear drive lover, I much prefer the silence of a double row timing chain. I hear prolonged use (vibration/noise/harmonics) can also transfer to bearings etc and potentially increase wear?? (Don't quote me). Nothing better than a good Rollmaster.
i will never use jp gear drives again from the wear and the warranty troubles ive gone through with them
diecrest - i will try on the recomendations from my engine machinist
i think i agree with trublu that gear drives advantages dont always outway the disadvantages of harmonics etc
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