Howard Jones
Supporter
I have been checking out several other forums and websites and I can't seam to get a really solid answer on this one.
Can a Porsche 915 gearbox be inverted (input shaft center line below the output shafts center lines) like many people do with the 930's, 50/ XX boxes?
There seams to be some belief that inverting a 915 causes oil starvation of the gear-set. I do know that many have been run in a mid engine car by flipping the ring gear around. Some machine work is necessary but not really beyond the capability's of several recognized Porsche gearbox re builders and can be done at the same time as a rebuild without huge increase in the rebuild cost.
My interest is in the added attraction of lowering the center of gravity of the overall power-train and the lower price/availability of the 915 gearboxes.
The 915 seams rather well suited for a engine making somewhat less torque at low vehicle/engine speeds than a V8 but also capable of holding up well to moderate power levels. Something on the order of 300-350HP is what I expect to run through this gearbox.
If it becomes necessary to use a G50 variant or one of the other new gearboxes like the Quaife, Mendeola or the others then the project's budget becomes much larger as the power goes up with the gearbox capacity. The increase in buget will also push out any startup so you can see why I am interested in the 915/ 350HP engine combo.
I am asking here among my friends because at this point I am not far enough along with my plan to waste vendors time on the phone filling me in on background. I prefer to have at least several ducks lined up before I get to the nut cutting.
If anyone really has experience with a 915 and the inversion question along with its capibility at known REAL power levels I will thank you in advance for your reply.
Can a Porsche 915 gearbox be inverted (input shaft center line below the output shafts center lines) like many people do with the 930's, 50/ XX boxes?
There seams to be some belief that inverting a 915 causes oil starvation of the gear-set. I do know that many have been run in a mid engine car by flipping the ring gear around. Some machine work is necessary but not really beyond the capability's of several recognized Porsche gearbox re builders and can be done at the same time as a rebuild without huge increase in the rebuild cost.
My interest is in the added attraction of lowering the center of gravity of the overall power-train and the lower price/availability of the 915 gearboxes.
The 915 seams rather well suited for a engine making somewhat less torque at low vehicle/engine speeds than a V8 but also capable of holding up well to moderate power levels. Something on the order of 300-350HP is what I expect to run through this gearbox.
If it becomes necessary to use a G50 variant or one of the other new gearboxes like the Quaife, Mendeola or the others then the project's budget becomes much larger as the power goes up with the gearbox capacity. The increase in buget will also push out any startup so you can see why I am interested in the 915/ 350HP engine combo.
I am asking here among my friends because at this point I am not far enough along with my plan to waste vendors time on the phone filling me in on background. I prefer to have at least several ducks lined up before I get to the nut cutting.
If anyone really has experience with a 915 and the inversion question along with its capibility at known REAL power levels I will thank you in advance for your reply.