porsche rocker arm rebuilder

[greyes59]

I am looking for a rebuilder for 911 rocker arms.
any info will be greatly appeciated

[Steve@Rennsport]

I can do those for you, properly.

[gregwils]

Originally Posted by steve@rennsport

i can do those for you, properly.

+1

[KTL]

cgarr can do them too.

[timmy2]

I sent mine to cgarr recently. He did a great job for a very reasonable price with a fast turnaround.

[greyes59]

How do I contact cgarr?

[timmy2]

Here is his latest post.
PM or email him by clicking on his user name. E-mail may be better.
Valve guide interferance

[TT Oversteer]

John Dougherty, aka Camgrinder, of Dougherty Racing Cams rebushed and reground mine when he reprofiled my cams. It was around $400 if I remember correctly.

[timmy2]

cgarr charged me under 1/2 of that amount. No rebushing needed, but that would only add another $30 or so.

[KTL]

Craig (cgarr) also uses self-lubricating lined bushings that so far perform outstanding in our application. We have them in a number of engines (two in Craig's fleet, two in mine and cstreit's Motodelta fleet, plus however many Craig has done for other customers) and they continue to perform outstanding.

[Henry Schmidt]

Supertec is rebuilding rockers with an entirely new process.
First the bushing is removed.
The rocker is bead blasted and inspected.
The the whole rocker is black oxide treated.
Then the adjuster treads are cleaned and restored with a forming tap. (read rolled)
A new SDU bushing is installed an sided. (greatly reduced coefficient of friction .05vs .34 for P/bronze and improved heat transfer)
Next the rocker pad (cam follower) is surfaced.
At this point the rocker is sent out for dry film lubricant.
After that, the bushing is drilled and the entire part is cryogenic treated.

We have sets in stock ready to ship. One day turn-around for most types.
$420 exchange

[Trophy]

Henry,

Will you also modify mechanical rockers for use in a 993 converted from hydraulic?

[Henry Schmidt]

Originally Posted by Trophy

Henry,

Will you also modify mechanical rockers for use in a 993 converted from hydraulic?

Sorry but at this point we're only rebuilding early style rockers.

[turbo nut]

I just rebush early non hyd. Rockers and dont drill the oil holes and use 993 shafts. With the correct grind on the camshafts will complete the conversion.

[Trophy]

I have a full new set of mechanical rockers I have bought. From what I understand I have to either put new bushings in them or turn them around to prevent an oil leak.

I also have a set of new (couple hour old) appropriate cams.

[willtel]

Originally Posted by Henry Schmidt

Sorry but at this point we're only rebuilding early style rockers.

Are 930 rockers the same?

[Henry Schmidt]

Originally Posted by willtel

Are 930 rockers the same?

Yes, but we may not have them in stock. The later 930 rockers seem to suffer failure more often than the earlier rockers so we don"t have as many cores.

[turbo nut]

Yes you can just turn the bushings to block the oil holes. If I remove the I replace them with new.

[chris_seven]

Originally Posted by Henry Schmidt

The the whole rocker is black oxide treated.

Henry, I would worry about the effect of Black Oxide treatment and the influence it may have on the fatigue life of relatively high strength steels.

I believe that earlier this year (April/May) Sikorsky ceased using this process due the 'embrittlement effects ' and subsequent component failure.

Another Helicopter manufacturer in the UK has observed fatigue life reductions of up to 80% and has followed Sikorsky in ceasing to use this process.

Shortly after this information appeared a revised Mil Spec was produced (MIL MIL-DTL-13924D) outlining new de-embrittlement procedures.

[Henry Schmidt]

Originally Posted by chris_seven

Henry, I would worry about the effect of Black Oxide treatment and the influence it may have on the fatigue life of relatively high strength steels.

I believe that earlier this year (April/May) Sikorsky ceased using this process due the 'embrittlement effects ' and subsequent component failure.

Another Helicopter manufacturer in the UK has observed fatigue life reductions of up to 80% and has followed Sikorsky in ceasing to use this process.

Shortly after this information appeared a revised Mil Spec was produced (MIL MIL-DTL-13924D) outlining new de-embrittlement procedures.

Thanks for the heads up. We will watch for any inkling of failure due to black oxide.
It might be interesting to know what black oxide process on what material your study sites?
Our parts are processed in a room temp solution.
I believe the rockers are cast iron. Are you suggesting there is any information about failure in this type of material?

Interesting reading:http://machinedesign.com/article/black-oxide-passes-hydrogen-embrittlement-test-0607