I'm planning on installing my cam with 4-6 deg retarded ( to move the rpm band up a little) how will this effect cyl pressure? and what more will it effect?

Engine is a blown superram engine 415 cui..........

It already has a +5 deg advance in it so I'm installing it "straight" up..............

Cam Spec Card Inquiry
PART NO. 08-301-8
01 INTAKE MASTER 3314S
02 EXHAUST MASTER 3316S
03 ENGINE CS NR276HR-113
04 GRIND NUMBER CS NR276HR-113
05 HYDRAULIC Y/N YES
06 VALVE ADJUSTMENT HYD
07 MAX GROSS VALVE LIFT .502 .520
08 DUR @ .006 TAPPET LIFT 276 288
09 VALVE TIMING @ .006 OPEN CLOSE
10 INT 30 66
11 EXH 82 26
12 THESE SPECS ARE FOR CAM(S) INSTALLED @ 108.0 INTAKE CENTERLINE
14 DUR @.050 224 236
15 LOBE LIFT .3350 .3470
17 LOBE SEPARATI 113.0
18 ADVANCE 5
19 VALVE SPRINGS 986-16

 

if you retard the camshaft ..you will definetly lower effective cylinder pressure at lower RPM range and lower cranking psi

224 dur @ .050" looks a little small for blower/cid engine size you have..so retarding cam might help you out depending on your gas octane and blower boost psi


it depends also on how much converter/stall and rear gear ratio you run (car weight)

trial and error


don't forget to check exhaust valve-to-piston clearance

making a retard move like that will loose approx .005+" per deg on exhaust per cam phase movement

 

I know its pretty small, must pass emission, its not a race car and I wont rev it beyond 5700rpm.

Car is a TA-89 stock weight and 2400 rpm stall and 3.27 rear..

thx/N.

 

Then why retard it?

 

looking to move up the peak power 500 rpm......

/N.