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Old 03-27-2005, 12:40   #1 (permalink)
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Roller carm Vs Solid cam

hi there just wanting to know the advantages and disadvantages of the 2 styles of cams

thanks
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Old 03-27-2005, 16:04   #2 (permalink)
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Re: Roller carm Vs Solid cam

Solids are a lot cheaper!!

I assume you mean solid flat tappet vs any roller (hyd or solid).

Roller setups require a roller cam, roller lifters, bronze gear on dissy shaft etc and they don't come cheap.

The roller lifters allow for a much steeper lobe rise. Flat lifters just cant hack the geometry. The steeper lobe rise means more duration at the higher lobe lifts (lobes are much fatter at the top).

See pics at bottom of link.

http://www.powerandperformancenews.c...gory_Code=CAMS
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Old 03-28-2005, 03:50   #3 (permalink)
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Re: Roller carm Vs Solid cam

Quote:
Originally Posted by TruBlu351
Solids are a lot cheaper!!
The roller lifters allow for a much steeper lobe rise. Flat lifters just cant hack the geometry. The steeper lobe rise means more duration at the higher lobe lifts (lobes are much fatter at the top).
Thats very true but the problem in Australia is that most cam grinders don't have the flat tappet profiles available which are anywhere near max theoretical velocities that would munch the lifter and cam lobe.

On the street a correctly designed flat tappet would be about 1/4 of the price and about 3/4 - 4/5ths of the performance of a correct roller setup.
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