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TRex cam problem thunder said it was fine

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Old Mar 3, 2008 | 03:24 PM
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Default TRex cam problem thunder said it was fine

I have .016 intake .052 exhuast clearance... what do you think run it or not. they said at operating temp the aluminum expands and the clearance will be more....anybody
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Old Mar 3, 2008 | 03:37 PM
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Thats way too close. Dangerously close IMO. .080/.100 is the standard ive always seen.
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Old Mar 3, 2008 | 03:51 PM
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Originally Posted by brad8266
Thats way too close. Dangerously close IMO. .080/.100 is the standard ive always seen.
i'm sure cams like the Ms4 don't even have that kind of clearance. But yeah I agree, that does sound way close. To close to even thinking about relying on good springs to save your ***.
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Old Mar 3, 2008 | 03:53 PM
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.070-.080 is considered minimum and "tight".
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Old Mar 3, 2008 | 03:54 PM
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umm yeah, either flycut or get something else.
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Old Mar 3, 2008 | 04:00 PM
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You'd be surprised how many people are running with that tight of clearance and don't even know it. Some never have contact while others have contact but never know it. If you like the cam, it's best to flycut for peace of mind or retard the cam a degree or two then re-measure.
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Old Mar 3, 2008 | 07:45 PM
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Originally Posted by Patrick G
You'd be surprised how many people are running with that tight of clearance and don't even know it. Some never have contact while others have contact but never know it. If you like the cam, it's best to flycut for peace of mind or retard the cam a degree or two then re-measure.
wouldn't that play with the powerband of the cam alittle bit if you retard it some? i would imagine it would, but I guess to make it clear better who cares then.
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Old Mar 3, 2008 | 07:49 PM
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Originally Posted by Patrick G
You'd be surprised how many people are running with that tight of clearance and don't even know it. Some never have contact while others have contact but never know it.
+1


good running MS3/4, motors. Later you have the heads off and see valve contact marks in the carbon. I guess thats normal for the room people run. out of sight....
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Old Mar 4, 2008 | 12:55 PM
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Thicker gasket?
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Old Mar 4, 2008 | 12:58 PM
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Originally Posted by BLWN1
Thicker gasket?
Not when the intake valve is .016, you would need an additional .060 to be safe.
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Old Mar 4, 2008 | 01:00 PM
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I checked mine without the gasket and was fine, how thick is a gasket, never really checked on that....
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Old Mar 4, 2008 | 01:02 PM
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I ran a trex with .030 spring shim and loved it! awesome hp and tq curve
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Old Mar 4, 2008 | 01:07 PM
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Originally Posted by dhpewterz
I ran a trex with .030 spring shim and loved it! awesome hp and tq curve
spring shim has nothing to do with piston to valve clearance.
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Old Mar 4, 2008 | 01:13 PM
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Originally Posted by turbojosh
I have .016 intake .052 exhuast clearance... what do you think run it or not. they said at operating temp the aluminum expands and the clearance will be more....anybody
I'd rather **** in the intake than run those clearance numbers. That intake clearance is close to the thickness of a fingernail. That's just me though.
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Old Mar 4, 2008 | 01:21 PM
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Old Mar 4, 2008 | 01:22 PM
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Originally Posted by BLWN1
I checked mine without the gasket and was fine, how thick is a gasket, never really checked on that....
A stock gasket is like .054.
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Old Mar 4, 2008 | 01:39 PM
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Originally Posted by studderin
+1


good running MS3/4, motors. Later you have the heads off and see valve contact marks in the carbon. I guess thats normal for the room people run. out of sight....
i would worry everytime i ran it... i would want a bit more piece of mind that !
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Old Mar 10, 2008 | 05:35 AM
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Originally Posted by brad8266
spring shim has nothing to do with piston to valve clearance.
I neversaid it did! I was just letting them know what i had and that i ran the trex for almost a year and never had any ptv issues.

Thanks
Darren
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Old Mar 10, 2008 | 06:56 AM
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Too close for comfort on any street setup. you need at least another /.040 to be a bit safer.
standard is .080/.100 but many run big cams at +/- .050
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