Thanks.

VVT is an interesting system to bridge between 2 valve per cylinder and 4 valve per cylinder engines.

Its the ability of the heads to flow air into the combustion that controls power. Two valve per cylinder engines were more efficient in lower rpm regimes. 4 valves per cylinder engines flow better at high rpms and tend to produce higher HP at those rpms.

In order to have an efficient engine at all rpms the "VVT" system allows the engine to change over from two to four valves per cylinder depending on the rpm.

Currently the HONDA VFR 800cc motorcycle uses this system. I'm not sure if it provides the benefit expected or it was merely a "tour-de-force" of technology for HONDA. For sure the technology has proven itself in automobile engines.

As I commented on another thread, It amazes me the complexity in modern vehicles.

Red

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2005 Titan KC SE, Helwig, True-Track, ARE MX Canopy

I thought it also employed a scheme for automatically adjusting the valves as well?

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05 KC SE Smoke
01 Suzuki 600 GSF
88 Fiero 2M4

I don't think it is a system to "adjust" the valves in action rather a system that "activates/deactivates" valves in motion.

On the GM variable displacement engines. The fuel injector is turned off on the cylinder being deactivated and thus it just passes the air through the cylinder. I think, but don't know for sure that the valves are held open to reduce the loss of power from compressing the air in the cylinder and not having a power stroke.

Red

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2005 Titan KC SE, Helwig, True-Track, ARE MX Canopy

130 Camshaft & Valvetrain :: Engine Mechanical :: Genuine Nissan Parts :: Titan (A60) 2004-2007 :: CourtesyParts.com
It shows the parts of the VVT in 07 but it doesnt show the 04-06

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Ryan

It also lists the same freekin part number for the 07 and the 04-06 camshafts!
Does this mean that they are the same? Does this mean that I can use the JWT cam set?

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Ryan

Probably not because of the change in lift and duration of the JWT Cams.

Yeah I was wrong. the part number is different. It has an "S" on it

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Ryan

Nice try though!