Quote Originally Posted by T 20 View Post
It could all be down to piston breaking John

Cardew showed the increase in cylinder pressure to have very little effect on the friction created by an O ring seal but did increase the friction created by a parachute seal.

So maybe it's down to the faster temperature rise due to piston speed ?




All the best Mick
I agree, though there may also be an additional factor from the o-ring allowing more lube into the swept area due to the lack of scraper effects that parachute seals have?

Cheers

John