Is this too much lift? (Custom cam question) - TCCoA Forums
 
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post #1 of 7 (permalink) Old 06-08-2004, 07:11 PM Thread Starter
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Is this too much lift? (Custom cam question)

The cam I have is from Crower (if case you are wondering)

I have PI heads and stock 96 TBird bottom end. Does anyone know if this is too much lift for TBird pistons?

Intake Lift: .560
Exhaust Lift: .571

Based on rocker arm ratio of 1.80 In and 1.80 Out.


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Big-Al

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post #2 of 7 (permalink) Old 06-08-2004, 08:38 PM
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WOW! you had better have some really good valve springs...I would worry about crunching one, and also wouldnt run the RPMs too high till I had one of the new generation spring sets in it.... JL doesnt even like the 0.550 lift of stock PI cams and he has a screamer...also, I believe the exact ratio is 1.81, but as usual I could be wrong...You could have clearance issues with valve float also, But I am not sure about that....good luck, and how does it idle?
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post #3 of 7 (permalink) Old 06-08-2004, 09:41 PM
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think thats bad.....I saw some crower cams that lifted .612 int and .612 exh and 288 degrees. Thats totally crazy!!

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post #4 of 7 (permalink) Old 06-08-2004, 09:45 PM
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Sounds perfectly sane for a purpose built race car, set up by a really knowledgable wrench., but to try drive on the street, totally crazy!....go figure
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post #5 of 7 (permalink) Old 06-08-2004, 09:58 PM Thread Starter
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Comp springs and titanium retainers

I have not put the cams in yet, I thought I would ask about the clearance first in case I had to make some...other modifications. These cams were in a newer GT mustang but they come with more dish than the TBird pistons which is the bases of my concern.

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post #6 of 7 (permalink) Old 06-08-2004, 10:20 PM
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Well, you can allways test fit them, and check the projection beyond the chamber proper, might just indicate what you could be up against,& you have a fighting chance with the springs, as they seem to do wonderous things in the area of float , rebound, and not breaking.... I am only pushing 0.50 lift wirh comp 268's and NPI heads so I'm small potatoes, with a really good Idle abit less peak tq, but awfully high average tq, but will allways wonder what the 274 duration would have been like.... hmmm?
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post #7 of 7 (permalink) Old 06-08-2004, 10:37 PM Thread Starter
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By the way, Approximate spring pressure is:

Open: 225/240 lbs.
Closed: 075/ 085 lbs.



Also, with that much duration, will I have any braking power?

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Last edited by Big-Al; 06-08-2004 at 11:00 PM.
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