After Market Cams Possible or Impossible?

1slow370 · 09-23-2010, 02:26 AM

yeah well mivec is the same as nissans CVTC wich every nissan has. the 370z has cvtc which is the "camshaft variable timing control" and then there is the vvel which is the "variable valve event and lift" cvtc advances or retardes the intake cam timing and vvel can actually adjust the lift and duration. Go to wikipedia and read about camshafts if that seems foreign. basically our cars can do electronically what other cars need cam swaps for.

gorillanismo · 09-23-2010, 10:56 AM

Quote:

Originally Posted by 1slow370

yeah well mivec is the same as nissans CVTC wich every nissan has. the 370z has cvtc which is the "camshaft variable timing control" and then there is the vvel which is the "variable valve event and lift" cvtc advances or retardes the intake cam timing and vvel can actually adjust the lift and duration. Go to wikipedia and read about camshafts if that seems foreign. basically our cars can do electronically what other cars need cam swaps for.

ok, thanks for the clarification, just for made some comparisons, VVEL is not the same as VTEC-i and CVTC is same as VTEC of Honda??

this is to just have everything clear..

1slow370 · 09-24-2010, 12:05 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

Lug · 09-24-2010, 11:00 AM

Quote:

Originally Posted by 1slow370

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

I thought that was the primary reason they were able to boost almost 100 more HP over the 2010 4.6L and still improve gas mileage.

1slow370 · 09-24-2010, 12:49 PM

sorry was thinking the old 3 valve 4.6 which is single cam. the new 5.0 is DOHC so intake and exhaust valve timing actually works the way it should. there is a lot of other stuff done to the new 5.0 as well like the 11.0 to 1 compression ratio which is a point higher than the older engines, as well as redesigned higher flowing heads. the 3 valve motors had SOHC with useless cam timing.

09-23-2010, 02:26 AM	#1 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,733 Drives: v8 74 260z ;) Rep Power: 7252	yeah well mivec is the same as nissans CVTC wich every nissan has. the 370z has cvtc which is the "camshaft variable timing control" and then there is the vvel which is the "variable valve event and lift" cvtc advances or retardes the intake cam timing and vvel can actually adjust the lift and duration. Go to wikipedia and read about camshafts if that seems foreign. basically our cars can do electronically what other cars need cam swaps for. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

09-24-2010, 12:05 AM	#3 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,733 Drives: v8 74 260z ;) Rep Power: 7252	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 12:11 AM.

09-24-2010, 12:49 PM	#5 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,733 Drives: v8 74 260z ;) Rep Power: 7252	sorry was thinking the old 3 valve 4.6 which is single cam. the new 5.0 is DOHC so intake and exhaust valve timing actually works the way it should. there is a lot of other stuff done to the new 5.0 as well like the 11.0 to 1 compression ratio which is a point higher than the older engines, as well as redesigned higher flowing heads. the 3 valve motors had SOHC with useless cam timing. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

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