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Tractor Pulling Discussion Forum

Roller rockers - how why?

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Hooked

05-25-2005 04:52:24




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Is it a big job to install high ratio roller rockers? Exactly how do they work to increase horse power? Thanks for the info.




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buickanddeere

05-25-2005 07:21:05




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 Re: Roller rockers - how why? in reply to Hooked, 05-25-2005 04:52:24  
The roller tips also reduce valve stem side loading which causes friction ,extra heat and valve stem/guide wear.



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Buzzman72

05-25-2005 06:25:14




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 Re: Roller rockers - how why? in reply to Hooked, 05-25-2005 04:52:24  
The roller pivot uses needle bearings, and it reduces friction and provides a negligible power increase in a low-rpm engine. It's the high-lift function that provides the power increase, as it allows the valves to open wider, which allows more air/fuel mixture into the cylinder in the same timing event. Providing your intake ports and valves are large enough to take advantage of this, with more air-fuel mixture in the cylinder, you get more "bang" every time the spark plug fires. In combination with a bigger bore or longer stroke or higher compression [or a combination of the three], the horsepower increase can be significant.

It all depends upon whether your engine is configured to take advantage of it. On a stone-stock engine, high lift roller rocker might improve performance some, but not nearly as dramatic a difference as when the engine has other modifications.

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Hooked

05-26-2005 05:54:20




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 Re: Roller rockers - how why? in reply to Buzzman72, 05-25-2005 06:25:14  
The tractor is a 1945 A with a power block bored .125 over, heisler head and JD 60 push rods.
Sounds like the roller rockers would work well with this tractor



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