Let's assume...bench racing a claimer motor.

[Stich496]

Thanks!

Then I assume that if you wanted to run stiffer valvesprings, you'd have to figure out a way to bump up the line pressure to the VVT actuator to compensate for the extra torque loading on the camshaft. Not easy to do with a single-stage main-gallery mounted internal oil pump. Or you'd have to modify the VVT actuator to impart more torque to the cam when it rotates.

sorry nope.. in a pushrod v8 they could add a rev kit.. and wala..

[Stich496]

claimer motor... make them inline 4's
I really want to see what happens if someone drops an ls type port head on a 4cyl and stuffs it with air and fuel

[38P]

sorry nope.. in a pushrod v8 they could add a rev kit.. and wala..

How would a rev kit help the VVT actuator cope with the load of increased spring pressure? All a rev kit does is help control excess valvetrain weight and motion by keeping lifters in contact with the camshaft. The VVT actuator would then be fighting against both the valve springs and the rev kit when it was advancing and retarding the cam. That would seem to make the problem worse, not better.

[stangbanger]

claimer motor... make them inline 4's
I really want to see what happens if someone drops an ls type port head on a 4cyl and stuffs it with air and fuel

A Honda Vtec motor will eat it for lunch is what'll happen.

[Stich496]

A Honda Vtec motor will eat it for lunch is what'll happen.

not a chance

[stangbanger]

not a chance

Grape or lime???


The koolaid I mean

[TheSilverBuick]

How would a rev kit help the VVT actuator cope with the load of increased spring pressure? All a rev kit does is help control excess valvetrain weight and motion by keeping lifters in contact with the camshaft. The VVT actuator would then be fighting against both the valve springs and the rev kit when it was advancing and retarding the cam. That would seem to make the problem worse, not better.

A Honda Vtec motor will eat it for lunch is what'll happen.

Exactly.

[Bob Holmes]

Domestic V8s, guys, domestic V8s.

[min301]

I'm not even gonna start...

[Bob Holmes]

Jump in, the water's fine.

[SuperBuickGuy]

so I'll ask the seemingly obvious question. The whole point of VVT technology is you don't have to spin the motor to the moon to get the same hp (6.2l VVT makes 426 hp, the 6.2l makes 420, yet the VVT motor gets 15% better mileage)... so why do you need higher spring pressures? even if you did, a lighter valve train would accomplish the same result as stiffer springs.... (snicker it would make the cam act smaller.... sorry, couldn't resist.)

I'm playing with this stuff on the Spider, so when its going, I'll get to answer my own question - but until then, I'm sure one of you smart folks will tell me what's going to happen.

[stangbanger]

The VVT in your v6 is completely different than the pushrod motors (and more effective).

[Mater]

i thought VVT was a way manufactures can get away from having EGR

never really paied much attention to the ressons for it. i do know the 3500 and 3900 v6s with the VVT have really flat torque curves

[SuperBuickGuy]

the reason I'm interested in it - it allows you to change the exhaust timing to spool up the turbo, or change the intake/exhaust events (they can be changed independently of each other) for incredible mileage capabilities.

Still pushrod or not, VVT does solve a number of problems that were solved in the past with high lift cams and strong springs.... that's the point I was making about that (said in my best forest gump voice)

or to put it in the form of a question - why do you need strong springs?

[stangbanger]

so you're using lighter springs and boost? Those cams will seem really small! HA