General Question to engine builders: Degreeing cams - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Walperstyle · 11-30-2011, 05:23 PM

Ideally, what kind of overlap would you want to have on your cams? and roughly where do you have the intake open and exhaust close.

I do understand the math behind this, but the open and close points of these are more important then the actual centerline/centerlobe max height.

I have crower V3 Turbo cams, JWT cam gears, GT35R .84 turbo

Performance level 5 - Stage 3 - Forced Induction Race - Drag Race and radical Street/Strip. Requires #84184 spring kit and compatible ECU upgrade for optimum results. Lope at idle.
INT/EXH - Dur @ .050” Lift: 222°/222° RR: 1/1 Gross Lift: .401”/.401” LSA: 114° RPM: 1500 to 7000 Redline: 7500

shim on both sides is 0.006 I believe. Wanted it tight to avoid 'chatter'.

Engine is on a stand, and right now I believe I have the intake start to open 13' before TDC, and EX close at 5' before tdc. I think overlap is fine, but maybe I should retard the intake 5 degrees or so?

11-30-2011, 05:23 PM	#1
Walperstyle Nissanaholic! Join Date: Nov 2004 Location: Alberta, Red Derp Age: 44 Posts: 1,729 Trader Rating: (0) Feedback Score: 0 reviews	General Question to engine builders: Degreeing cams Ideally, what kind of overlap would you want to have on your cams? and roughly where do you have the intake open and exhaust close. I do understand the math behind this, but the open and close points of these are more important then the actual centerline/centerlobe max height. I have crower V3 Turbo cams, JWT cam gears, GT35R .84 turbo Performance level 5 - Stage 3 - Forced Induction Race - Drag Race and radical Street/Strip. Requires #84184 spring kit and compatible ECU upgrade for optimum results. Lope at idle. INT/EXH - Dur @ .050” Lift: 222°/222° RR: 1/1 Gross Lift: .401”/.401” LSA: 114° RPM: 1500 to 7000 Redline: 7500 shim on both sides is 0.006 I believe. Wanted it tight to avoid 'chatter'. Engine is on a stand, and right now I believe I have the intake start to open 13' before TDC, and EX close at 5' before tdc. I think overlap is fine, but maybe I should retard the intake 5 degrees or so? __________________ KA-T ORG-Function over Flush