ZF straight cut dog gear set

No, but straight-cut gears are usually only used for pro racing because of the extreme noise they generate. Hewland racing transaxles use straight cut gears and you can hear the howl & whine at least one corner away. So not for the street unless you're already hard of hearing.

Yes, I know this company and spoke to them in October 2017 about these gear sets. They can custom manufacture these gears but I suspect they want an order for a few sets before they would start production.

There is an Italian company that also can make these:

www.colotti.com (email: marco@colotti.it)

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Originally posted by Push1267:
Has anybody heard about these gearsets

Pfitzner gearboxes

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So not for the street unless you're already hard of hearing.

Who said it was for street ?? :-)

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Yes, I know this company and spoke to them in October 2017 about these gear sets. They can custom manufacture these gears but I suspect they want an order for a few sets before they would start production.

There is an Italian company that also can make these:

www.colotti.com (email: marco@colotti.it)

Thanks, very useful information. How's going with your build?

We should have my new race car finished by May. We have fully built the car now and just finished the wiring. Now we need to strip the shell and paint it. Then a careful build and we start testing and sorting it out. The engine runs very high compression as we will use E85 fuel. Expecting 650hp.

Checkout the exhaust system which we finalised yesterday.

What dynamic compression ratio did you choose with the E85?

Interesting. I hope Colotti learned a few things about high-torque U.S. engines, from the years when Ford chose them over ZF for the GT-40 racers. Colotti were directly responsible for many DNFs during the mid '60s. The ZF users did not break....

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Originally posted by René #4406:
What dynamic compression ratio did you choose with the E85?

I really don’t know. The engine is being built by a Cleveland specialist here called Synergy Motorsport.

Interesting that you are choosing to go with the limited cast 4V heads. (Exhaust side mainly) I was running E85 with 13.5:1 but got tired of looking up where to get it and then consistency of ratio. finally gave up, installed dish pistons so I would not have to change my aluminum heads which have many hours of flow bench work. lost over a hundred horsepower but I can get gas anywhere! Down to only 670Hp now. ok for an old street car. As the Bossman knows those 4v heads Intakes like rpms but the exhaust side doesn't and becomes a compressor. Just a thought.

I’m using the standard cast iron 4v heads because the rules for the Sportscar class require the use of the standard block and heads. Everything else in the engine is free choice.