What rocker arm ratios do people see? Options

[stugray]

I am adjusting the valve geometry while putting in a Raby 9700 cam and I am seeing .38 on the exhaust cam lift and .496 at the valve (an exh rocker ratio of 1.3) and I have a .39 on the intake with a .546 at the valve ( an int rocker ratio of 1.4) is this what everyone else gets for rocker ratios:

Intake rocker ratio = 1.4
Exhaust rocker ratio = 1.3

These are the 1.7 (1.8?) rockers that accept the 911 swivel feet.
I am using the swivel feet, have modified the rocker faces, adjustable push rod, and zero lash to do the meaurements.

Do those rocker ratios look like stock?

I want to take 50 thousandths off the Combustion chambers to increase the CR, but my measurements say I wont have enough clearance on the Intake valve once I shave off 50 thousandths.

I only have ~0.075 clearance now from the piston to the Int valve as it is with a deck of 0.030 and everything else (crank & rods) stock - flat top 96mm pistons.

That Intake valve travel of ~0.55 looks huge to me. Anyone else care to comment?

Stu

[Jake Raby]

So whatever Jake has done to his cams for a coating is NOT the same as a stock webcam.

So much for us just repackaging things and selling them, as had been insinuated by some who simply do not know and just wanted to start crap. The same goes for lots of other things that we've sold over the years that may appear to be like any other over the counter offering.

Not even Web Cam knows what we do to camshafts after they are delivered to us, and they've never asked. They know that I don't use their lifters, and they also never ask about what I do for lifters, because they don't care.

There is a reason why we have lost ONE single cam since 2004 and that one was MY fault. Hell that one was in my own personal engine.

We never use shims under rockers, so our studs are not optimized for them. Its been about 7 years since I had to shim a rocker stand to optimize valve train geometry.

I don't know whether to be pissed off at you, or really happy that you have gotten this far with the project. I hope you have smooth sailing with the rest of it, valve train geometry is the biggest bitch with these engines, period.

This post has been edited by Jake Raby: Apr 3 2013, 06:44 PM

[worn]

So whatever Jake has done to his cams for a coating is NOT the same as a stock webcam.

Not even Web Cam knows what we do to camshafts after they are delivered to us, and they've never asked. They know that I don't use their lifters, and they also never ask about what I do for lifters, because they don't care.

We never use shims under rockers, so our studs are not optimized for them. Its been about 7 years since I had to shim a rocker stand to optimize valve train geometry.

Now I am thinking I made a mistake. Could I have purchased a cam and tappets from you? I thought you didn't do that no more. Would've if I had known.

At this point I would think that you would have zipperino need for shims too, because you have CNCd the heads to a repeatable size. My heads aren't so lucky, but I am having fun as a complete amateur.