Interference engines

1989-91 1.0L Firefly (CANADA)

Definitely NOT interference. You can take .100" off the head, increase the valve lift by 2 mm, run domed pistons, and that thing still won't be an interference motor.

FWIW the first belt-driven camshaft engine was the Glas in 1966 (subsequently bought by BMW, supposedly for their patents and the Dingolfing assembly plant), and the first domestic example was the Pontiac SOHC six. Remember THEM? (Do any still exist?)

And, no, I don't know if either of those examples were interference or not...

shadetree30 wrote: FWIW the first belt-driven camshaft engine was the Glas in 1966 (subsequently bought by BMW, supposedly for their patents and the Dingolfing assembly plant), and the first domestic example was the Pontiac SOHC six. Remember THEM? (Do any still exist?) And, no, I don't know if either of those examples were interference or not...

I recall reading that the Glas engine being interference and having belt longevity issues. Cool little cars though.

93gsxturbo wrote: I prefer timing gears. No chains to stretch, no belts to get oil soaked and fail.

Which engines/cars run timing gears?

93gsxturbo wrote: I prefer timing gears. No chains to stretch, no belts to get oil soaked and fail.

no thanks... same problem as many chains... think it'll last forever... but NOT.

One comes to mind, the Volvo B series engines - use nasty nylon (for quiet as it self destructs)