adjustable lifters

I wonder if it would be possible to take a stock hollow FORD lifter, drill a hole in the top, install a screw and make it adjustable?
 
I have had an idee for a long time making roller lifters and adjustment by using the shimwashers used in ohv engines.
Measure gap lift valve with the kr bar lift out shim insert new suitable size.
That way i can manufacture a hollow lifter without to much of an challenge.
Just using same guiding as iskys radius tappets.
Please shime in with your thoughts...i have probably missed a few issues...
 
Have to come up with a cam grind. I'm not that knowledgeable on the differences in the grinds, but a cam for radiused lifters might work.
 
flatheadmurre said:
I have had an idee for a long time making roller lifters and adjustment by using the shimwashers used in ohv engines.
Measure gap lift valve with the kr bar lift out shim insert new suitable size.
That way i can manufacture a hollow lifter without to much of an challenge.
Just using same guiding as iskys radius tappets.
Please shime in with your thoughts...i have probably missed a few issues...
Click to expand...

If your talking a hollow bucket type roller lifter, where you'd plop the shims in the bottom. If the bucket was deeply cut inside, what goes between the shims in the bottom of the bucket and the valve stem? You'd have a big gap to make up, wouldn't you? To not have the big gap, it would be heavy, which I think is not desirable with a roller profile cam. Which would have very fast opening and shutting rates.
What about a bucket in side a bucket? You have a roller with a bucket on it, then shims in the bottom of the bucket then an upturned bucket that slips inside the roller bucket, the shim stack moves the inner bucket up or down to adjust the gap? Get what I meen? This would work with stock valve lengths.

Crower makes roller cams, and I guess the lifters too.
Martin.
 
Ok , last night i took an engine apart thAt i didnt built.
Potvin 425 with isky 185g springs set at 1.9inch and johnson
Hollow adjustibale lifters.
You could see on the cam where lifter hit the lobe after it
Jumped over the roof of the cam....
My engine with 1.8 inch 185g and stock lifter follows the cam
And doesnt jump ...
So , lifter weight matters i guess unless you want to run massive spring pressure...
 
scooder said:
If your talking a hollow bucket type roller lifter, where you'd plop the shims in the bottom. If the bucket was deeply cut inside, what goes between the shims in the bottom of the bucket and the valve stem? You'd have a big gap to make up, wouldn't you? To not have the big gap, it would be heavy, which I think is not desirable with a roller profile cam. Which would have very fast opening and shutting rates.
What about a bucket in side a bucket? You have a roller with a bucket on it, then shims in the bottom of the bucket then an upturned bucket that slips inside the roller bucket, the shim stack moves the inner bucket up or down to adjust the gap? Get what I meen? This would work with stock valve lengths.

Crower makes roller cams, and I guess the lifters too.
Martin.
Click to expand...

My thought was making the lifter radius on the stem side like the std and using a small shimdisc you have them down to about 1/4 for motorcycles.
That way i only get wear on the lifter from friction against lifterbore making it last a long time.Being a roller i can machine it in the lathe from the rollerside if i want the valveside solid.
Or have an opening undre the shimdisc.
 
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