How come no one ever talks about roller rockers here?
#1
#5
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#7
I am not sure exactly what the differences are in motorcycles but I have experience building small blocks and the main advantages to a roller rocker is under high lift situations it prevents sideloading the valve stem which extends the life of the valve guides and it also reduces friction at the valve tip which would reduce heat, slow down wear, and free up a couple ponies. I am also not sure how much the rpm levels apply in this particular situation but in higher revving motors you need to either lighten up the reciprocating mass or increase valve spring pressure to keep from experiencing valve float and with higher valve spring pressures the factory stamped rocker arms aren't exactly up to the task. My assumptions with the lack of talk about them in these forums is that the shaft rocker setups in harley is a pretty stout setup from the moco for the average stage one stage two build. The majority of us don't necessarily hot rod these motors and there is alot of excess noice attributed to roller rockers so it may not be what alot of the cruiser folks are really looking for. JMO
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#8
That's essentially what I've been told. High lift cams or high revving motors. I'm not there yet with my bike. Probably a good thing, harley roller rockers are awfully expensive, compared to sbc.
#9
Some don't like roller rockers because they say they're noisey. Just had an SE120R installed which has a .650 lift and I opted for the roller rockers. Oddly enough Harley didn't have roller rockers as a requirement for this build. I must have a good builder, because the engine has less sewing machine sound than my stock motor did.
#10
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Maybe I was too vague for you. Look in the dozen or so Engine tech forums regarding every engine subject you can think of...including Roller Rockers (valve train) if you seriously need advice...and not throwing out a meaningless quip why nobody talks about...
Jeez....do a search man!
Jeez....do a search man!
Last edited by dohadex; 11-18-2010 at 01:43 AM.