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Old 10-03-2019   #46
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Re: vibration / balance

so that line should be horizontal at mid lift?
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Old 10-03-2019   #47
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Re: vibration / balance

Ref Ian's comment regarding the crank-shaft pulley---there should be NO play in it at all. I would follow his advice and get that checked--broken/cracked 'Woodruff' keys are not unknown. As Ian is, from your pictures, of the opinion that there is no problem with your push-rods/rockers, I would get the crank pulley drive checked, and sorted, as a matter of priority
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Old 11-03-2019   #48
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Re: vibration / balance

Quote Originally Posted by Mike r View Post
so that line should be horizontal at mid lift?
Hi Mike, Yes, BUT, please remember It is all dependant on the Cam you have fitted, the pushrod length, how old your valve springs are AND most importantly what valve guides you have in the head, (I have seen several different types) unless an engineer strips, checks and measures everything you cannot be sure that getting the rocker angle right is going to give you any better valve operation. My engineer is a very picky man, he will always do his best to get the most from an application no matter what level you require. I would get the play in your pulley sorted first.
Ian.
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Old 15-03-2019   #49
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Re: vibration / balance

guys, not so good news here, the pulley isn't moving on the crank, the crank is moving with it.
its play in the big ends allowing crank slight rotation without moving the pistons...
so its engine out and apart again...f
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Old 15-03-2019   #50
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Re: vibration / balance

...bad news indeed. But that's a flippin' lot of play. It could even be loose or stretched big-end bolts or a problem with the gudgeon/piston-pin at the "little" end.
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Last edited by fiat500; 15-03-2019 at 07:05.
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Old 15-03-2019   #51
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Re: vibration / balance

That's not good. I hope it's nothing too major.
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Old 15-03-2019   #52
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Re: vibration / balance

Quote Originally Posted by Mike r View Post
guys, not so good news here, the pulley isn't moving on the crank, the crank is moving with it.
its play in the big ends allowing crank slight rotation without moving the pistons...
so its engine out and apart again...f
Hi Mike, Thats a bummer I hope that you don't find any serious damage.
Ian.
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Old 15-03-2019   #53
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Re: vibration / balance

Ian,is the BIS crankshaft better then the stock, is it the same stroke, and finally where id you get the improved bearings?
thanks
Michael
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Old 15-03-2019   #54
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Re: vibration / balance

Quote Originally Posted by Mike r View Post
Ian,is the BIS crankshaft better then the stock, is it the same stroke, and finally where id you get the improved bearings?
thanks
Michael
Hi Mike, for me as the BIS crankshaft was the last of the engine line, and because the counterweight is closer to the longitudinal centreline it seemed the better option. The stroke is standard. A lot of engine makers still use the standard crank for whatever reason and I know of one German company who 'Tuftride' them to stiffen the casting for higher revs. It is simply a case of 'pay your money and take your choice'!!!!
I am using lightweight conrods with standard BIS (80mm) pistons and the balance shop had to drill my BIS crank to get it in balance. It will depend on your parts as how any balance pans out (to add or remove weight) my bearings came from Axel Gerstl
in Germany.
Ian.
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