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  #16 (permalink)  
Old 05-28-2013, 02:13 PM
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Originally Posted by MouseFink View Post
My math is perfect...I even graduated high school.
Talk to AP72, you guys can synchronize your calculators. I try not to insult anyone that is trying to help me.

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  #17 (permalink)  
Old 05-28-2013, 02:14 PM
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The math is wrong a .010" change at the adjuster but is .016"+/- at the lifter. A full turn would put you at about what you see as perfect preload.

Btw that .016 is a swag as each rocker and pushrod setup will cause that to vary some. The point is the preload is NOT the same as the amount the adjuster nut is lowered unless your adjustment is on the pushrod cup.

Gee billy, I gajumated hikeskool too!
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Old 06-05-2013, 08:55 PM
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OK, here's the Surfer Kid's 355, L31 heads, RPM intake, 750 Q-Jet, 9.9:1 SCR, 8.3:1 DCR, 1 5/8" long tube headers, CompCams XE-274H hydraulic flat tappet cam, installed 2 degrees retarded on these 0.050" numbers....
Intake centerline angle 106
Exhaust centerline angle 114
Lobe separation angle 110
Intake opens (7) degrees BTDC
Intake closes (43) degrees ABDC
Exhaust opens (50) degrees BBDC
Exhaust closes (6) degrees ATDC
Intake duration 230
Exhaust duration 236
Overlap 13 degrees

RPM....HP....TQ
2000...141...370
2500...179...376
3000...230...402
3500...290...435
4000...346...455
4500...393...458
5000...428...449
5500...440...419
6000...414...363

Peak volumetric efficiency 97.4% @5000
Peak BMEP 194.3 lbs @4500

He's using 1.5:1 ratio full roller rockers, so there will be additional power from the motor that will not show up on the air dyno, due to the reduced friction of the roller bearing fulcrum in the rockers. Engine oil temps will be lower also, due to reduced friction. This combination of parts makes a reeeeaaal nice 355 street motor.

Last edited by techinspector1; 06-05-2013 at 09:09 PM.
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  #19 (permalink)  
Old 06-05-2013, 09:39 PM
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Originally Posted by techinspector1 View Post
OK, here's the Surfer Kid's 355, L31 heads, RPM intake, 750 Q-Jet, 9.9:1 SCR, 8.3:1 DCR, 1 5/8" long tube headers, CompCams XE-274H hydraulic flat tappet cam, installed 2 degrees retarded on these 0.050" numbers....
Intake centerline angle 106
Exhaust centerline angle 114
Lobe separation angle 110
Intake opens (7) degrees BTDC
Intake closes (43) degrees ABDC
Exhaust opens (50) degrees BBDC
Exhaust closes (6) degrees ATDC
Intake duration 230
Exhaust duration 236
Overlap 13 degrees

RPM....HP....TQ
2000...141...370
2500...179...376
3000...230...402
3500...290...435
4000...346...455
4500...393...458
5000...428...449
5500...440...419
6000...414...363

Peak volumetric efficiency 97.4% @5000
Peak BMEP 194.3 lbs @4500

He's using 1.5:1 ratio full roller rockers, so there will be additional power from the motor that will not show up on the air dyno, due to the reduced friction of the roller bearing fulcrum in the rockers. Engine oil temps will be lower also, due to reduced friction. This combination of parts makes a reeeeaaal nice 355 street motor.
Thanks for running the numbers for me! Much appreciated!
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