Nissan 370Z Forum - View Single Post - After Market Cams Possible or Impossible?

1slow370 · 09-24-2010, 01:05 AM

vtec is actually a second cam lobe ground for higher rpms, and when a honda gets up to speed it switches rocker arms to the high performance lobe. CVTC is a hydraulic system in the intake pulley that can advace or retard the intake cam in relation to the rest of the engine +-40 degrees (about). i-vetc is similar to cvtc, vtec is like vvel except you have on and off instead of being able to electronicly vary it anywhere inbetween at any rpm. additionaly some vtec motors would only switch one of the two intake valves per cylinder to the larger lobe which created a pressure differential in the head and supposedly induced swirl in the combustion chamber upon Vtec activation. Fords newest version of variable cam timing found on the new 5.0 is basically a ripoff of cvtc as the parts are all designed to function exactly like the nissan system. also if the new 5.0 is still a pushrod single cam engine there will be negligable benefits from having cam timing as the lobe seperation angle will still be fixed

In my opinion the new toyota version of vvel is going to be the one to beat once it is used on more engines. Thankfully toyota doesn't make a decent RWD sports car any more so it will never be used on an engine with more than 250hp

09-24-2010, 01:05 AM	#10 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	vtec is actually a second cam lobe ground for higher rpms, and when a honda gets up to speed it switches rocker arms to the high performance lobe. CVTC is a hydraulic system in the intake pulley that can advace or retard the intake cam in relation to the rest of the engine +-40 degrees (about). i-vetc is similar to cvtc, vtec is like vvel except you have on and off instead of being able to electronicly vary it anywhere inbetween at any rpm. additionaly some vtec motors would only switch one of the two intake valves per cylinder to the larger lobe which created a pressure differential in the head and supposedly induced swirl in the combustion chamber upon Vtec activation. Fords newest version of variable cam timing found on the new 5.0 is basically a ripoff of cvtc as the parts are all designed to function exactly like the nissan system. also if the new 5.0 is still a pushrod single cam engine there will be negligable benefits from having cam timing as the lobe seperation angle will still be fixed In my opinion the new toyota version of vvel is going to be the one to beat once it is used on more engines. Thankfully toyota doesn't make a decent RWD sports car any more so it will never be used on an engine with more than 250hp __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 Last edited by 1slow370; 09-24-2010 at 01:11 AM.