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Tractor Pulling Discussion Forum

Re: Oil

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Author  [Modern View]

07-19-2013 07:13:15

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I agree with the amount of Zinc is not that big of a deal, in roller lifter engines that is. Zinc is highly recommended for flat tappet engines, especially as lift goes up and the aggressiveness of the cam goes up. Adding more rocker ratio also puts more contact pressure on the lobe/lifter interface.

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07-19-2013 16:35:23

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 Re: Oil in reply to Schultz, 07-19-2013 07:13:15  
More zinc does not add protection. More zinc just ensures there are more hours of zinc protection as zinc is gradually consumed.

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07-19-2013 17:44:13

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 Re: Oil in reply to buickanddeere, 07-19-2013 16:35:23  
I agree with buick and deere oil viscosity should be looked at and only looked at in ensuring a good oil wedge is developed when performance clearances have been used on main and rod bearings . Usually needs a higher volume pump to. I haven't seen a tractor engine come in my shop yet with performance clearances until it leaves my shop either though .Most of them that arrive at my shop takes a breaker bar to turn the crank with no rods/pistons connected and they just cant figure why it doesnt run well lol. Before it leaves my shop they can turn the crank with one hand grasping the snout of crank. As for zinc well I never read a oil label to date to see what the zinc quantity is or isnt. On a solid lift cam I do use cam breakin lube everytime . I have cams, solid lift cams with .320 lift on the cam mushroom lifters for a agressive ramp profile with 1.85 rockers you can figure the net valve lift .Valve train is light so it doesnt take over a 920 or 944 comp spring with 120 lbs on seat. Valve springs spring rate and not breaking a camshaft in properly will be more detrimental to a camshaft than zinc or no zinc will matter in my humble opinion
This post was edited by MLPANKEY at 17:56:54 07/19/13 4 times.

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07-19-2013 18:07:19

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 Re: Oil in reply to MLPANKEY, 07-19-2013 17:44:13  
Quoting Removed, click Modern View to see PS I like straight weight valvoline racing oils personally

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north puller

07-19-2013 13:03:20

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 Re: Oil in reply to Schultz, 07-19-2013 07:13:15  

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