SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: flames on July 30, 2015, 11:40:34 AM
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What improvements have people experienced with changing to roller rockers. I have a opportunity to purchase a used cam and roller rocker set up for my ford 460. Anything I should look for?
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It’s all about friction reduction and rocker stability at higher RPM. Quality and make are important plus material, trunion diameter, ratio (effect's valve lift) and will the rockers clear the valve spring retainer. Plus don’t overlook sometimes when changing to a roller rocker push rod length will be incorrect for the proper contact pattern across the valve stem tip. Purchasing a used cam for a person with an educated eye is no big deal, but to most others it’s a big no, no. A roller cam isn’t critical for lifter to lobe sequence, but on a flat tappet it is, every lifter has to be marked to what lobe it came off of. If you don’t know, shit can all the lifters and buy new ones with the proper break in lube if the camshaft itself passes a good visual inspection. With the addition of roller rockers you will never feel the difference in performance, but perhaps you will with the cam swap, but on the other hand if the cam is not a well match for your set up it can hurt performance. You really have to know where you are now with your performance and present spec’s, remember, one or two or seven parts are not responsible for power production, it’s the entire engine combination. Choose wisely, good luck.
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Agreed. What cam?
Roller rocker arms in and if themselves really don't make a seat of the pants difference imho.the ratio will likely be the same, so the only thing you will gain is a slight geometry improvement and friction reduction. You won't feel it in the seat.
I Hanne never been a fan of used camshafts unless we're talking about a billet roller.
To much margin of error.
JMHO.