Z303 cam problem - Page 2 - MustangForums.com



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Old 01-18-2011, 11:08 PM   #11
sn95_331_GT_ yellow
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Quote:
Originally Posted by AdderMk2 View Post
im pretty sure you have the cam timing mixed up .bob

isnt it retard the cam to increase the power band rpm range?
beat me to it...

reason:

retarding the cam moves the events later into the process IE: a larger cam makes more power up top due to the increase in piston/air speed filling up the cylinders more completely, also the reason they dont do so well down low.

granted with a stock cam it will be a very small difference, but still worth something...

and the OP was talking about advancing the cam by 1 tooth on the gears, not using the adjustable keyways that offer the advance/retard features...

1 tooth = WAYYYYYYYY more than even 8*...
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Old 01-19-2011, 01:17 AM   #12
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Quote:
Originally Posted by AdderMk2 View Post
im pretty sure you have the cam timing mixed up .bob

isnt it retard the cam to increase the power band rpm range?
Yes, you're right. Advance moves down, retarded moves up.
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Old 01-19-2011, 02:53 AM   #13
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Yes, you're right. Advance moves down, retarded moves up.
I was even polite about it this time....
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Old 01-19-2011, 12:41 PM   #14
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Thanks for your help guys.
Now I understand.

2 years ago i bought a Z303 cam. I installed it my first engine to 5.0 in 1994.
Then I checked the clearance, the piston-valve (0.050 ")
modifications, AFR 185cc heads (58cc), Edelbrock RPMII, 1.6 rockers, exhaust FlowMaster 2x 2.5 ", Mac shorty 1.5 / 8 headers .......

On the dyno result;

Horspower, 335 HP @ 5,791 rpm on the flywheel.
Torque, 459NM (340 lb-ft) @ 4205 rpm
max rpm 6778

the engine worked very well, just 5000 rpm up oil leak from dipstick tube.
Unfortunately, the pistons were cracked between the first and second ring, but the engine run until the endI killed him with high rpm

Now I have a 5.0 engine 302 of 1988 lx (forged pistons), unfortunately, cutting the pistons are smaller than those of my previous engine.

Go back 2 *, or undercut the piston?
dynograph look looks good?






[IMG]
[/IMG]

Last edited by michal@; 01-19-2011 at 01:35 PM.
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Old 01-19-2011, 02:25 PM   #15
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flycut the pistons
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