Any input on what shaft mounted rockers to use?

[Caprimaniac]

Oh, you're all awake at this time... I've having a bad morning with a hangover from yesterdays beer & that awful rom & coke.

Anyway, you all have good input, and I agree with you all -partly. Yes, it need to go with the shims. And yes, the roller will still hit the valve stem tip at the inner part (towards the shaft) of the diameter. This is desireable because the rate at start of valve opening will increase and a increase in valve giude wear can be accepted.

By using more/ other shims it might be able to get the geometry even better. But, after all I have read & understood, I cannot see there's much to gain.

Yes; I will check pattern on stem tip. After rolling over a cycle, it looked very promising, rolling to and fro the centre.

You are correct on the pushrod clearance, Blykins. Very tight, but OK with a 5/16" rod. (again by eye, will measure.) Although, I have been looking at going to 3/8" PR... What do you think?
A 5/16" cro-mo one piece 0.080 wall will hold up quite a bit?

And I'll need 0.05 shorter PR for the inlet than the exhaust as well.

What I thought of the Jesel parts? Looks quite sturdy. BUT. If I had the tools to fabricate, I might have done otherwise. Why not make the platform in aluminium instead of steel? The size makes it very heavy. And why not use a one- piece shaft? OK; much easier to change one unit with two shafts. And with a one piece shaft, it might be other issues regarding spacing the shafts.

But, I think the instructions that came with the parts are a bit too vague. I was also shure there were a PR lengthchecker in this kit, but there wasn't. (spent 30min making one up while I could have one for 11$).

Let's do some more work & this will be ready in a day or two.

[blykins]

What's your open spring pressure?

[RICK LAKE]

caprimaniac Any chance of getting a first name?
The supports for a T&D or Jesel setup need to be made from steel. These systems will turn 10,000 rpms. You have a couple of issues between the two. Aluminum weaker than steel, Aluminum more exspansion rate than steel, strength again goes to steel. Shorter life than steel with fatigue.
Aluminum is cheaper and lighter and could be used on system where a rpm limit of 7,000 rpms is done, but again how many heat cycles are the limit??
There are a couple of articles in HotRod,Car Craft, Hot Rodding, and race motor manuals that show you the correct geometery for the rockers to valve stem. As for custom pushrods, Smith does the quickest and best job for correct length needed. As far as going to 3/8 pushrods, make sure the rod clears the adjust location and doesn't hit the back side of the rocker. Make sure the opening in the head is large enough for clearance through the whole cycle of each pushrod. 3/8" has less defection than 5/16". You might want to look into tapered pushrods. If you are going to still do 8,000 rpm hits, 3/8" will hold up better but may endup with having to control more weight. Good luck. Didn't jesel have a light weight shaft setup of windsor motors? I thought they machine a "I" groove into the top of the rocker to remove weight. Rick L.