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What is lobe separation?

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rustyiron

07-25-2002 13:31:57




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I am going to have a cam ground for a tractor and was told to make sure I had the proper lobe separation. What is that, the overlap?




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Bob

07-27-2002 21:33:37




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 Re: What is lobe separation? in reply to rustyiron, 07-25-2002 13:31:57  
G-man is bang on. Also i would advise a 2% offset key on your cam gear if your going the max on your lift. you would want to advance your timing 2degrees. Also rememeber that if you get it ground to the max, your valve setting will increase dramatically. EG: an oliver with stock cam is set at 11 on the intake and 17 on the exhaust. With a cam cut to .320 you would have to set your tappets at probably intake-22-24 and exhaust at 26-28 Without this extra clearance you would get a face wash of gas or whatever it is your burning(out the muffler) and you would loose half your compression

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G-MAN

07-25-2002 13:44:02




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 Re: What is lobe separation? in reply to rustyiron, 07-25-2002 13:31:57  
Lobe separation is physical configuration of the camshaft in relation to the actual spacing of the intake and exhaust lobes away from each other. It is ground into the cam and cannot be changed without regrinding. Centerline is the relationship of cam position to crankpostion adn can be changed by degreeing the camshaft. Overlap is the amount of time, in crankshaft degrees, that the two valves are open simultaneously. I would say that if you're dealing with a reputable cam-grinder, you will be okay.

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