How about a picture of the stands for factory hemi heads?


Those double headbolt Alky heads make it look like a much sturdier mount, but with the single head bolt factory head, the mount would probably be very similar to Jesel.

I would also think with the right geometry, there SHOULD be very little side loading, and the needle bearing could withstand more load than ball bearings.

4500.00 or so.. i hear for steel rockers like that,,, thats about right

jesel stuff had problems with needle bearings,, breaking out the ends of the cages

Here is a picture of the Rocker system that we designed for our 426 Super Stock Engine program. They are available to the general public and they are designed for a stock head casting.
We have tested them extesivly with over 105 dyno pulls and 25 passes in the car and had very good results.

If anyone is interested you can reach me at 661-942-3364

Erik Jones
Jones Engine Development

www.jonesenginedevelopment.com

sorry,,, i worded that wrong,, I had problems with that,, wilkes did to,, teuton, caro, a few others,, but charlie has told me he didnt have any issues,, maybe we were trying in the wrong direction too hard and caused problems,, i dont know,, he is the fast guy

Is there really a need for more high dollar rocker systems for hemi engines, when there is stageV and bartons?

didnt your polockski motor break in the first 30 ft of the first run last year? I would'nt be throwing stones. Since that breakage (valve) 2 years ago, I think my dad or I have won all but one event, how many have you won. As usual a intelligent discussion about racing tech is hijacked by one of polokoskis buddies.

cw

it sure would be nice to keep this on the tech level. darren, you were saying...........

Well we all see new stuff all the time and more often than not it's just trick of the week stuff. I've gotten to the point that not much really catches my attention anymore, but these really did. To me they're a step forward in rockers. You have to use some type of pivot and needles and bushings have been used for so long I just never thought of using anything else.

I can say without a doubt there's power in valve train stability, and longevity as well. All rockers side load to one degree or the other and you have to shim, or use thrust bearings to take the load. Using a roller bearing takes the loads with the least amount of drag, and you can have zero side to side movement. Steel rockers are heavier than aluminum, but from what we've seen with big Fords the steel rockers make more power than any aluminum we've tried. We've had another company making steel rockers for our Ford stuff for a couple years now, and they last longer and make more power, so it's not speculation. Most of the big Fords we do have well over an inch of lift, brutal spring pressure and really fast ramps. The aluminums wear out after less than a season, even the Jesel stuff, so steel is a better option.

We can also have these made in titanium for anyone who wants a lighter than aluminum rocker. Obviously they're expensive, but maybe a class engine could justify the cost.

Jesel, Barton(T+D), and Stage V are all fantastic parts, this to me is just something different, and in my opinion a better part. I don't think they're needed for any street application, or average bracket engine, but they do offer potential to more demanding engines IMO.

how much DT ????????????????????????

with the right geometry, there SHOULD be very little side loading
The side load is a function of the difference in vectors between the valve stem and the pushrod, and it's not affected much by conventional geo errors.


the needle bearing could withstand more load than ball bearings
Definitely - how did they hide a big enough ball bearing in that support? The usual methods of replaceming a needle/roller with a ball requires one or more of the following:
1. larger housing for larger ball and larger bearing OD
2. smaller shaft for larger ball and same bearing OD
3. multiple bearings with same ID/OD on a longer shaft

If not, radial capacity is much lower.

Amen Polyspheric!

Ball bearings is an interesting idea. I'd like to see how that was done. If there was enough space I'd probably design rocker with tapered roller bearings on each side of the rocker arm. Basically smaller versions of the wheel bearings used on a disc brake hub.