MiniVLT wrote:
Hi Doc,
I have one of these Trigger belt drive setups that has yet to be installed on my engine. I bought it 2nd hand from Barry at Northern Mini parts when Henry Draper was the owner. (not telling my age here). The kit is 2nd hand and came with a 2nd hand belt and a brand new Pirelli belt.
From your legendary experience, if one of these belts was to "fail", how would it fail? Stripped / missing teeth? Belt snap / break?
I ask in this way as I have a jap RB30 motor with a toothed belt cam drive standard that I have changed at the religious 70K km mark as per recommended replacement interval, and have noticed only the slightest of rounding of the teeth on the belts when they were removed. No cracking on the backside of the belt so to say, and if memory serves me correct, it was a gates belt too. I have pulled timing belts of that were severely cracked on the backside and definately required replacement!
Timing belts have always to my knowledge had a km time life.......what if we monitored / examined the belt, could we get away with an "on condition" belt? Depending on how you drive of course!
Cheers Shane
I drove twincam Fiats for over 20 years. They are hard on belts, they need replacing at 50,000 miles (~80,000km). If you don't, they do not break, they strip teeth.
Their belts were the same form as in the Triger Mini kit, but much longer.
Failure mode of trapezoidlal belts- I have never seen one break, all those I've seen fail stripped teeth around the bottom pulley when their polyester covering wore through. The teeth of these belts are just rubber, there is NO reinforcing in them.
IMO, my Mini belts still look new after big miles because there is no idler to flex the belt.
I would fit your new belt, keep the other as a spare.
Ensure there are NO bruise marks on the pulleys from fitting that can wear the belt.
I polish the crank nose so the bottom pulley is a nice neat slide on fit.
Consider changing belts at 30,000 mile intervals. or 50,000 for the kevlar one.
_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
