Theory?

[Griswald]

Ok, here's my stab at a good question.

Nitrous SBC - some stats in my sig.

High lift rocker arms to get the valve open quicker to allow more evil piston-burning nitrous in the cylinder? say 1.70 / 1.75 ?? Same goes for exhaust. Snap that valve open to get the gas out?

Given ramp design I guess this could be a definite advantage?

[Griswald]

57 reads....anybody else have an opinion they want to throw in, here?

Am I on the right track or getting wet?

[Jay Allen]

When you are attempting to get the valve opened further (which can be a good thing!), doing it with rocker arm changes the lobe globally. A higher lift rocker arm does not increase overall duration. Rocker ratio does not change duration at .050, per say. But if you look at duration at the VALVE, then it is changed dramatically.

Again, you are on the right track IMHO. Lift is a very good thing as long as you can control it. But be careful of what it does at the lower lifts!

[Griswald]

Ok, so if the lobe has a very wide (?) ramp, that in conjunction with a higher RR ratio will get the valve open sooner and farther?

What could this hinder at lower lifts as you mentioned?

[Jay Allen]

It gets to a particular lift quicker.

It does open the valve further.

It could really mess the bottom end of the curve up bad. Depending upon what the lobe looked like down there. Hard to say.

What are the cam specs?

[Griswald]

.726/.696 282/297 @ .050 w/ 1.6rr


I run a rocket block that uses a 50mm cam bearing. I've been told that the big core affects duration a few points. True?

[Jay Allen]

.726/.696 282/297 @ .050 w/ 1.6rr


I run a rocket block that uses a 50mm cam bearing. I've been told that the big core affects duration a few points. True?
282 at .050??? OMG.

Yes, the larger core makes the cam bigger. Everywhere, not just at a few points.

[Griswald]

282 at .050??? OMG.



Is that a good thing or bad thing?

[Jay Allen]

Bad, very bad.

[Griswald]

Hmmmm.......too much or too little?


Looking forward to your recommendations. You've got my info.