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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET48AS (ATD Assembly)
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<blockquote data-quote="ogrilp400" data-source="post: 159046" data-attributes="member: 88"><p>I'm not a petro Chemist although I did dable in the test equipment some decades ago. But, I have the experience. I built my Norvin and put it on the road in 1978 and ride it daily. Super petrol was at all the pumps back then. I built it with 9.5:1 pistons, as was the done thing in the seventies and avance by the book at 38 degrees BTDC. In about the late eighties early ninties unleaded petrol started to come in. It didn't come in over night but was phased in and I continued to mostly use Super right up to the end. When I started to use unleaded I noticed the the engine would ping when accelerating. I put up with it for awhile but then took out the 9.5:1 pistons and replaced them with pistons measured at 8.2:1. This helped but the pinging was still there. Slowly I bought the advance back to 34-35 degrees BTDC. This I still run it at today. As an aside the unleaded petrol did cause be a BIG problem but thats a bigger story for another thread.</p></blockquote><p></p>
[QUOTE="ogrilp400, post: 159046, member: 88"] I'm not a petro Chemist although I did dable in the test equipment some decades ago. But, I have the experience. I built my Norvin and put it on the road in 1978 and ride it daily. Super petrol was at all the pumps back then. I built it with 9.5:1 pistons, as was the done thing in the seventies and avance by the book at 38 degrees BTDC. In about the late eighties early ninties unleaded petrol started to come in. It didn't come in over night but was phased in and I continued to mostly use Super right up to the end. When I started to use unleaded I noticed the the engine would ping when accelerating. I put up with it for awhile but then took out the 9.5:1 pistons and replaced them with pistons measured at 8.2:1. This helped but the pinging was still there. Slowly I bought the advance back to 34-35 degrees BTDC. This I still run it at today. As an aside the unleaded petrol did cause be a BIG problem but thats a bigger story for another thread. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ET48AS (ATD Assembly)
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