VVTC... how does it work - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

*Jeff240sx* · 07-30-2001, 01:04 AM

I am looking at a s15 sr20det engine and understand how most of it works.  I just don't know what vvtc is.  I know after Honda let out VTEC, with 3 cam lobes, and then toyota and Porsche come out with variable valve timing methods.
I just wanna know how Nissan's VVTC works.
Thanks,
-Jeff

07-30-2001, 01:32 AM

The i-VTEC system combines VTEC (Variable Valve Timing and Lift Electronic Control) technology with an innovative new camshaft phase control system called VTC (Variable Timing Control).

VTC uses a spool valve that directs high-pressure oil to chambers inside the intake cam's drive sprocket that allows for continuous adjustment of the intake camshaft's phase (position relative to the crankshaft) over a range of +/- 25 degrees (advance or retard). A separate VTC electronic control unit monitors RPM, camshaft and throttle position, ignition timing and engine exhaust condition to determine the necessary cam phase adjustments.

thats honda style. i guess its the same style with nissan

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07-30-2001, 01:04 AM	#1
Jeff240sx I hate you too... Join Date: Jul 2001 Location: Tampa, FL Age: 38 Posts: 5,828 Trader Rating: (0) Rides Gallery: Jeff240sx Feedback Score: 0 reviews	I am looking at a s15 sr20det engine and understand how most of it works.  I just don't know what vvtc is.  I know after Honda let out VTEC, with 3 cam lobes, and then toyota and Porsche come out with variable valve timing methods. I just wanna know how Nissan's VVTC works. Thanks, -Jeff

07-30-2001, 01:32 AM	#2
Guest Posts: n/a	The i-VTEC system combines VTEC (Variable Valve Timing and Lift Electronic Control) technology with an innovative new camshaft phase control system called VTC (Variable Timing Control). VTC uses a spool valve that directs high-pressure oil to chambers inside the intake cam's drive sprocket that allows for continuous adjustment of the intake camshaft's phase (position relative to the crankshaft) over a range of +/- 25 degrees (advance or retard). A separate VTC electronic control unit monitors RPM, camshaft and throttle position, ignition timing and engine exhaust condition to determine the necessary cam phase adjustments. thats honda style. i guess its the same style with nissan