Robert Linton

(1) There was something on the web that mistakenly said that the Porsche 919 (LMP 1 car) had a carbon fiber gearbox but that was incorrect. (2) Yes, the case/housing. (3) The carbon fiber gearbox (with titanium inserts) will save approximately 20 pounds. (4) As to "attempts to use hybrid steel/carbon-fiber gears inside the gearbox for further weight reduction", I am aware of discussions (perhaps even I have had some), though not only about steel/carbon fiber but aluminum metal matrix composite/steel, titanium metal matrix composite/steel, etc., not to mention the various ways in which each hybrid might be combined (put together). (5) As far as I know, today, the only race teams that have carbon fiber gearboxes are certain of the F1 teams although I believe that some of the Audi LMP 1 cars (R18?) had carbon fiber gearboxes. (6) Yes, none of this is "a walk in the park" but very few advances are, although, with the advent of electric vehicles, one might question the need for continuing development of traditional gearboxes, though I might question, for several reasons, whether or not electric is the ultimate solution.

Robert Linton

Re hybrid gears, the following may be of interest:
https://www.compositesworld.com/arti...smission-gears

Robert Linton

And: https://www.compositesworld.com/articles/hybrid-steelcomposite-transmission-ge

TexasPorschelover

I don’t know the technical terminology but are the composite gears discussed in a helo gearbox fixed ie not engaging with other gears to provide altering drive ratios? Could CF gears hold up to gear “meshing” especially under very heavy loads?

Robert Linton

There are a number of questions, but, under the correct circumstances, meshing should work.

Nizer

How about a magnesium/aluminum crankcase a la BMW's N52 motor?

Robert Linton

Please ask me after the gearbox is completed, installed and functions.

Robert Linton

Today, I had an idea. Instead of a crankcase made from a different material, I have given the go ahead to design and produce reduced weight titanium rods, lightweight high temperature pistons, a reduced weight crankshaft, titanium aluminide wrist pins and possible valvetrain upgrades. Together, they will have much more of an effect upon the 911R driving experience than a reduced weight crankcase.

home7271

miky360

I wonder if I’d be able to use those parts for my turbo S 🤔

Robert Linton

I do not know but the parts department of a Porsche Dealer should be able to check the parts numbers.

Nizer

Look forward to following the progress and seeing the final parts.

TexasPorschelover

Would they perhaps work as replacements in the 991.2 GT3? If so interested.

TexasPorschelover

The connecting rods are already titanium. How much more weight could come off them?

https://christophorus.porsche.com/en...991-motor.html

sumbaco

Wow wow wow wow. This is dreamy. Are you raising the redline or re-gearing the car?