SNAP!

semi finals. 2 cars away from staging. engine stumbles, gave her a blip on the pedal. dead! push it away, check no spark. found dizzy not spinning. pulled dizzy & drive out, all ok, wind over enging, cam not rotating but cambelt is.
damn, broken roller cam. 1 1/2 seasons old. anyone have similar problems with Comp Cams breaking. mines only a tame unit, spring pressure is only 500 on the nose but it broke just past the first journal, now i need to find a similar replacement & a few valves. don't you hate motorsport when this sort of nonsence happens?

Had the same thing happen but with a flat tappet cam. Are you running a timing chain? Mine was loose and that is what I was told was the cause. The chain going from loose to tight to loose and the cam basicilly getting whipped back an forth.

no chain. it's a dry belt with idler so no flexing of the belt. belt is still firm.

i had the pin that holds the cam to the gear break before. every thing spins but the cam

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i had the pin that holds the cam to the gear break before. every thing spins but the cam

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Only on single bolt cams, I have seen more than one Isky single bolt cam have the pin come out and end up in the oil pan It tears up a lot of valves if theere close to the minimum V to P clearances