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October 5th, 2006, 11:35 PM
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#1 |
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Newbie
Join Date: Oct 2006
Posts: 3
 iTrader: 0 reviews
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TFS And Rockers
im going 2 order some tfs twisted wedge heads and stage 1 cam,i was wondering if i could use the 1.7rr on them
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October 5th, 2006, 11:42 PM
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#2 |
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MM Fanatic
2002 Mustang GT
11.47@120.58
Join Date: Aug 2005
Location: Valdosta, GA
Posts: 3,940
iTrader: 0 reviews
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What are the specs on the cam? Usually folks choose a cam based on the stock 1.6 ratio...
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October 6th, 2006, 12:45 AM
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#3 |
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Newbie
Join Date: Oct 2006
Posts: 3
iTrader: 0 reviews
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it had a .499 lift i was thanking i could use the 1.7s 2 get somemore lift out of it i kind of figured i might have some ptvc problems with that
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October 6th, 2006, 06:15 PM
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#4 |
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Regular
Join Date: May 2006
Posts: 254
iTrader: 0 reviews
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TFS Track Heat stage 1 is good for stock engines with a performance close to Ford Racing E303 camshaft.. they have I/E durations of 221/225 @ .050" valve lifts, .499 / .510 lifts on I/E with 1.6 ration rockers, and LSA of 112 with intake centerline at 107 crank degrees.
With 1.7 RR you will get .530 / .542 lifts.. I don't know if the stock flat pistons have valve reliefs to accept this lift, but I personally doubt it. |
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October 6th, 2006, 10:17 PM
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#5 |
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MM Ninjas!
 
1990 Mustang LX
9.36@143 mph
Join Date: Jan 2006
Location: North Fond du Lac, Wisconsin
Posts: 11,375
 iTrader: 1 reviews
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I've run .600 lift successfully in the past with TFS heads and stock pistons BUT I've also had a stock engine that wouldn't clear an E303 cam. Valve to piston clearance always should be checked to be safe.......or you can play the lottery....
__________________
My daily driver has 16 cylinders and 4400hp @ 1000 rpm....  ***1988 Mustang GT - Stock....almost 
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October 6th, 2006, 11:54 PM
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#6 |
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Enthusiast
Join Date: Sep 2006
Location: emmaus, pa
Posts: 508
iTrader: 0 reviews
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roll the dice, haha
__________________
1995 GT::Sold! Looking for another stang... |
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October 7th, 2006, 01:58 PM
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#7 |
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Regular
Join Date: May 2006
Posts: 254
iTrader: 0 reviews
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Different cams have different timings and it all depends on what degree of the crankshaft does valve-lifting take action, and also for how long... I think this is why a stock 5.0 piston with stock valves may accept a cam with .600" lift but not another one with .499"
I believe there has to be a theoritical way to know -from the cam card- if the PTVC would be OK or not, and the practical checks later will just confirm it. |
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