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Old 08-12-2010, 10:44 AM
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coil bind

I have built a 362 cu in windsor motor the cam is 350 lift and 245 degrees of duration at 50. valve springs are dual springs rated at 120lb closed and 320 open and using anti-pump up lifters. the valves are set at 0 lash with a half turn past. also using a split ratio rockers 1.6,1.7 rockers, heads max lift is .600.. the motor accelerates great to 6500 rpm but will not accelerate past that.

i'm thinking that the lifters pump up at the high rpms like they are supposed to and it is making the valve train go past the max 600 lift on the 1.7 rocker side and creating coil bind.

what do you think?

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Old 08-12-2010, 10:49 AM
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Quote:
Originally Posted by stinger460
I have built a 362 cu in windsor motor the cam is 350 lift and 245 degrees of duration at 50. valve springs are dual springs rated at 120lb closed and 320 open and using anti-pump up lifters. the valves are set at 0 lash with a half turn past. also using a split ratio rockers 1.6,1.7 rockers, heads max lift is .600.. the motor accelerates great to 6500 rpm but will not accelerate past that.

i'm thinking that the lifters pump up at the high rpms like they are supposed to and it is making the valve train go past the max 600 lift on the 1.7 rocker side and creating coil bind.

what do you think?
Nope, coil bind would break parts, not limit rpm. Spring sounds like it should be enough to do the job if this is flat tappet, but may not be stiff enough for the rate of lobe acceleration with a 1.7 rocker. Have you discussed the use of the 1.7 rocker with the cam manufacturer?? If this is a hydro roller it likely isn't enough spring pressure.

How good are your fuel and ignition systems??
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Old 08-12-2010, 10:55 AM
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If it were coil bound, you'd be breaking parts. Why don't you try "zero lashing" it. That takes valve lifter pump-up out of the picture. If it still is limited to <6500 RPM, I'd be looking at the spring pressure.

You should have already verified the clearances for the entire valve train before start up, if you didn't, you should now. The additional clearance that is provided before spring bind, for instance, is to prevent spring bind even if the lifters DID pump up.

The installed height has to be adhered to, as well. Otherwise the valve/lifter can loft over the nose of the lobe, and/or bounce on the seat- both of which is hard on parts.

There's more to it than just these couple things, but it's a start.
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Old 08-12-2010, 10:57 AM
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fuel and ignition are all on where they are supposed to be. however when measured 350 lift time 1.7 rocker = 595. ive read that i should have .060 to .080 clearance on the springs. the cam is flat tappett
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