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Old 11-24-2006, 05:24 AM
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cam timing?

would early or late camshaft timing make the engine run hotter than normal?

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Old 11-24-2006, 04:19 PM
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early i believe....
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Old 11-24-2006, 04:44 PM
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If timing is retarded the engine will run hot. Joe
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Old 11-24-2006, 04:53 PM
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runn141,

I do not think cam timing will affect engine temps. Ignition timing will have an affect on temps.

Early cam timing will produce more power at the bottom end that is comming off the starting line, and Late cam timing produces better top end power that is going through the finish lights.

Scholman
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Old 11-24-2006, 05:04 PM
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Cam timing will affect operating temp? Hmmm.
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Old 11-24-2006, 05:09 PM
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reason i ask was ive built motors that have run cold and one that ran 260 degrees at all times no matter what i did to help cool it but i never degreed the cam in any of them. but i do now and ive seen some as much as 6 degrees off. just curious about it.
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Old 11-24-2006, 05:23 PM
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I would say advanced cam timing would create more cylinder pressure in tunn causing a little more heat.

Ingniton timing is to advanced will cause more engine temp and cooler exhaust temp and late ingnition timing will make the engine run cooler and more heat in the exhaust.
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Old 11-24-2006, 06:34 PM
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Quote:
Originally Posted by runn141
reason i ask was ive built motors that have run cold and one that ran 260 degrees at all times no matter what i did to help cool it but i never degreed the cam in any of them. but i do now and ive seen some as much as 6 degrees off. just curious about it.
Think about logic and basic statistics. You can't compare various engines that have significant differences between them. If your saying you have taken the same motor with various installed camshaft settings, advanced and retarded and under the exact same operating conditions and ambient conditions they operated at different temps., then I'd say that's interesting. Otherwise it's not good data as it relates to not degreeing a cam and degreeing a cam.

You have to remember, cruising around is not going to force the engine into producing a lot of heat. If a cooling system is designed to control the waste heat produced by a 300 HP motor, why in heavens name should it have a problem cooling to a setpoint on the thermostat when cruising around only generating maybe 40 HP? Even if there were, some small minute additional amount of heat by being 2 degrees off on camshaft timing, the headroom that is built into the cooling system would easily dissipate it.
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Old 11-24-2006, 07:49 PM
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Quote:
Originally Posted by Rick WI
Think about logic and basic statistics. You can't compare various engines that have significant differences between them. If your saying you have taken the same motor with various installed camshaft settings, advanced and retarded and under the exact same operating conditions and ambient conditions they operated at different temps., then I'd say that's interesting. Otherwise it's not good data as it relates to not degreeing a cam and degreeing a cam.

You have to remember, cruising around is not going to force the engine into producing a lot of heat. If a cooling system is designed to control the waste heat produced by a 300 HP motor, why in heavens name should it have a problem cooling to a setpoint on the thermostat when cruising around only generating maybe 40 HP? Even if there were, some small minute additional amount of heat by being 2 degrees off on camshaft timing, the headroom that is built into the cooling system would easily dissipate it.
its really no big deal i dont have any of the engines anymore but like you said it is interesting because the cam timing is all that it could of been, its all that is left, and its all driving conditions also. it hasnt happened since i started degreeing and setting cam timing to the cam card specs.
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Old 11-24-2006, 10:55 PM
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Or maybe it was something else in that engine that didn't have anything to do with the cam..... There are a lot of variable and it is difficult to control all of them, or sometimes to even tell what is going on.
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