FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: Royce on January 20, 2020, 12:17:15 PM
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Could you shoot me a recommendation for a spring for this Comp HR grind. 23562R/23564R. 2.19 intake 1,7 ex. 3/8 stem. Max rpm 5500. Stock rockers with end stands
RB
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325/252 with .356” lobe lift, really lazy lobe but your valvetrain is heavy.
Not looking at displacement or cylinder head flow, but focusing on the above with a 5500 rpm peak, I’d be at about 160-165 seat and 370-380 open.
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Thanks Brent.. This is a 525 inch torque motor, with a less than robust valve train, hence the lazy lobe. I wanted to get by with as little spring as possible to ease the strain on the rocker shafts.
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I figured it was a large engine.
A small OD dual spring (1.25-1.3) or a beehive/conical will be your friend.
Those spring pressures are perfectly fine for stock rockers and end stands.
FWIW, you could have ran a lot more aggressive camshaft and still would have been safe.
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Comp 26120 beehive. Probably should go in at 1.890 to 1.900 with what you describe.
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Don't think you even need that much on the seat, but you might want a little more open. The 5500 number should be an easy target with almost any decent dual spring, but I would also vote for the beehive/conical deal - took me a while to get comfortable with the idea of a single spring, but they do seem to work well in this sort of application. Just be aware that on a hydraulic roller, once you loose valvetrain control it often "poops the sheets" pretty hard - - it'll be perfect at 5800 and crashing off 40 pounds of torque at 5900. If you hear the exhaust note change at a certain RPM - stay below that number. Or add pressure/reduce weight (titanium or tool steel retainers).
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Thanks guys that is the info I needed...