looking for titanium, lightweight rockers and valves

[Trakrat]

Does anyone recommend a vendor who would sell the following drop in replacements for a 3.2?

titanium spring retainer, rocker arms, and valves???

I'm just trying to look at options to allow for slightly better performance and reliability, to reduce valve float... as I have a tendency to spend my time at redline.

[turbobrat930]

Here ya go

JB Racing - Custom Engine Components

[Trakrat]

Originally Posted by turbobrat930

Here ya go

JB Racing - Custom Engine Components

Thanks... they have some great stuff (was looking at getting their carbon fiber shroud)... but unfortunately they don't have any of those parts listed for a Porsche on their site.

[turbobrat930]

Originally Posted by Trakrat

Thanks... they have some great stuff (was looking at getting their carbon fiber shroud)... but unfortunately they don't have any of those parts listed for a Porsche on their site.

Give them a call. If they do not carry them, then contact either Chris Carroll at TurboKraft Or Neil Harvey at Performance Developments.

Contact Us | Turbo Kraft

About Us – performancedevelopments.com

[Trakrat]

Originally Posted by turbobrat930

Give them a call. If they do not carry them, then contact either Chris Carroll at TurboKraft Or Neil Harvey at Performance Developments.

Contact Us | Turbo Kraft

About Us – performancedevelopments.com

Thanks again... I'll give them all a call and see what I can find.

[bpu699]

CGarr was just rebuilding my heads...

He noted that whoever built them before had really increased the valve spring pressure and used aftermarket springs.

I think that may be why I had wear on one rocker, I suspect. But I am sure that the extra spring pressure was probably added to prevent valve float by whoever rebuilt the motor in the past...

I would love to figure out who rebuilt this motor in the past... clearly it was set up for the track/high rpm...

I bring this up as increasing valve spring pressure may be a more cost effective way to decrease float... (I know its less optimal, but clearly builders are doing it).

['76 911S 3.0]

AASCO Motorsports is another excellent option:

Products | Valvetrain

[Catorce]

Second vote for AASCO

[chris_seven]

We have been making Ti valve spring retainers for around 6 years now.

They are made from 6AL4V and are Ti Carbide coated to eliminate galling.



We also make forged steel adjustable Rocker Arms which use a standard Adjuster.

They are made from 300M-VAR and are Isotropically superfinished before being surface treated with a PVD applied diffusion layer which is 1000HV and will help retain an oil film.

The rocker pads have an increased length - the same as the 906/RSR Rocker and are more suited for use with high lift cams.

The bushes are standard Glyco parts from a stock rocker and the rocker shafts are also surface treated and ground to a very close tolerance.

[Trakrat]

Originally Posted by bpu699

CGarr was just rebuilding my heads...

He noted that whoever built them before had really increased the valve spring pressure and used aftermarket springs.

I think that may be why I had wear on one rocker, I suspect. But I am sure that the extra spring pressure was probably added to prevent valve float by whoever rebuilt the motor in the past...

I would love to figure out who rebuilt this motor in the past... clearly it was set up for the track/high rpm...

I bring this up as increasing valve spring pressure may be a more cost effective way to decrease float... (I know its less optimal, but clearly builders are doing it).

You bring up the exact point as to why I'm just looking at lighter components vs. just a stronger spring.
I don't want so much force that the rocker is hugging the cam with more than needed force... and I don't want the performance (however minimal it may be) to be decreased by having to use some of the energy to move those stronger springs.

[Tippy]

Originally Posted by bpu699

CGarr was just rebuilding my heads...

He noted that whoever built them before had really increased the valve spring pressure and used aftermarket springs.

I think that may be why I had wear on one rocker, I suspect. But I am sure that the extra spring pressure was probably added to prevent valve float by whoever rebuilt the motor in the past...

I would love to figure out who rebuilt this motor in the past... clearly it was set up for the track/high rpm...

I bring this up as increasing valve spring pressure may be a more cost effective way to decrease float... (I know its less optimal, but clearly builders are doing it).

I'll take those pesky springs off your hands and supply you with stockers. Just tell me when....

[Ken911]

Pauter is making rocker arms now also with a better lift ratio than stock.

[chris_seven]

Originally Posted by Ken911

Pauter is making rocker arms now also with a better lift ratio than stock.

Do you know the rocker ratio ?

The standard rocker is just a little less than 1.5 and the RSR Rocker is 1,5.

At the moment we are trying to develop billet cams and we have modelled this part of the engine.

When we 3-D Modelled the cam and rocker it seemed very difficult to increase the ratio due lack of space in the cam tower which also tends to limit cam profile design.

There is clearly an interation between the cam profile and the rocker ratio which becomes the limiting factor.

The 'longer' shoe was fisrt used by Porsche with the RSR Rocker as the 'Sprint' cam doesn't work too well with the standard rocker.

[Ken911]

Porsche Rockers - Pauter
This the link. I think they were 1.65/1 when I talked to them on the phone it was something different with the radius of the foot. They are also significantly lighter than stock. I was going to buy a set but just couldnt aford it. I could be wrong on the ratio it was a couple years ago when i talked to them.

[chris_seven]

The radius of the foot is tricky and we have discussed this in previous threads and is part of the rocker design we chose to model carefully.

I am not sure that the radius is critical as long as it is always the same but it will change where the rocker sits relative to the valve stem and this could impact on the adjuster.

Making the foot longer is, of course, a good idea.

I am not sure what would happen if you took an 'extreme' cam and used a 1.65 rocker ratio but I suspect it may not fit in the tower but we will try to see if it would work with one of our 'new' cams.

We chose to forge a 1965/66 rocker for use with Period F Appendix K Race cars.

A company in the UK started making 'billet' rockers a few years ago and suggested that they were 'FIA' compliant.

We installed them in Race Engine which we were having inspected and sealed by an FIA Scrutineer prior to running the car in Europe and he refused to sign off the engine.

His opinion was that if we were to re-manufacture rockers they should be virtually indistinguishable from the original so this is the path we followed.

It does provide another potential benefit in that the rocker has the same inertia and stiffness as the original component and that the spring resonances will be very similar to that of the standard set up which may prevent spring failures.

We are also discussing springs with a UK specialist company and they wanted the model of the rocker so they would look at this aspect of the spring design.

We are trying to produce a 'beehive' spring but I don't expect progress until the New Year.

[gtc]

Originally Posted by Trakrat

Does anyone recommend a vendor who would sell the following drop in replacements for a 3.2?

titanium spring retainer, rocker arms, and valves???

I'm just trying to look at options to allow for slightly better performance and reliability, to reduce valve float... as I have a tendency to spend my time at redline.

You fail to mention what your redline will be. You may not even need aftermarket valvetrain components.

[stownsen914]

Unless you plan on revving over 8000 consistently, you might be just as well off going with stainless steel valves, which can cut upwards of 50% off the weight compared to stock valves, and use a good set of aftermarket valve springs and Ti retainers like the ones Aasco sells. The above won't break the bank like Ti valves/springs and aftermarket rockers will.

[stownsen914]

Originally Posted by gtc

You fail to mention what your redline will be. You may not even need aftermarket valvetrain components.

Yes. If you're staying under 7000 RPM, maybe just buy some upgraded springs like the ones Eibach sells which aren't as stiff as racing ones but better than stock.

[chris_seven]

Originally Posted by Trakrat

You bring up the exact point as to why I'm just looking at lighter components vs. just a stronger spring.
I don't want so much force that the rocker is hugging the cam with more than needed force... and I don't want the performance (however minimal it may be) to be decreased by having to use some of the energy to move those stronger springs.

Moving the spring doesn't really use any energy as all of the energy is recovered when the spring unloads.

The only increase in parasitic loss will be due to the difference in mean torque caused by the change in the load at fitted length of the spring integrated over several revolutions of the camshaft and could be quite small.

[racing97]

Chris the re-manufacturer of the cam towers is the only way to fix it and this is quite expensive and could quite possibly not be the best bang for the $buck. I dabbled with Roller Rockers in the early 80's and while unique it is obvious that it didn't catch on. I think we are stuck at least for a while with the fitment in the cam tower limiting lift and the Rocker positioning in the ratio area that has stalled the 2 valve Porsche cam development for 30 years now as far as pushing the Constant Velocity, Constant Acceleration design impeding any real significant testing which may or may not render the engine power band acceptable except in competent race chassis and team development which we don't seem to find in presently in Vintage Track day usage, Although I am sure you are aware of the Williams Singer connection,,, I wouldn't doubt if you have a hand or some input in it...

regards