1/4 scale Porsche 917 180 degree V12 Build

[ozzie46]

Oh great!! Now the suspense will keep me awake for quite awhile!
Ron

[stevehuckss396]

I meant readables, books. Damn spell check.

[ozzie46]

Yeah. Right, and moon is made of green cheese. 

Ron

[stevehuckss396]

Oh man I love cheese.

[steamer]

Oh man I love cheese.

 

[steamer]

Just about finished with the initial drive gears....output shaft and fan drive.    The fan drive is press fit   ( .002") so I don't think it's going anywhere!

compared to the original....

[Vixen]

Òh! So sweet
Mike

[stevehuckss396]

That's some nice work right there too bad you have to hide it in the engine.

[Admiral_dk]

Great - so now you also have the centre distances 

What do you plan to do next - the block, or ?

Per

[steamer]

Great - so now you also have the centre distances 

What do you plan to do next - the block, or ?

Per

Probably finish the connecting rods.    I should have the new block all sorted out by then     I'm still prognosticating over lubrication solutions....its getting close.

[steamer]

That's some nice work right there too bad you have to hide it in the engine.

Steve...it is so nice to use a lathe that you can explicitly trust...I ask for it...it gives it!!!    .Turning the bearing diameters to size within .0005" was really easy once set up correctly.   Rinse and repeat!

As a side note, I have the spindle bearing clearance adjusted to the SouthBend spec, for really tight work, it might want to be tightened up a bit...but it did well enough!

Dave

[RReid]

That is work to make even Herr Mezger proud! Very impressive.   

[steamer]

That is work to make even Herr Mezger proud! Very impressive.   

Thanks Ron....

[steamer]

Final thrust bearing design for both the crank and the output shaft, though I plan on doing the fan layshaft in a similar manner, its not laid in yet

I came up with this while doing the new block.  Replace the crank bearings either side of the gear with flanged bearings of the same size, so drop in replacements.   so now the crank is captured at the center...which growth wise minimizes  the movement axially.   Additionally, I have needle roller bearings on the output shaft with bronze thrust washers either side.  The gear is pressed and woodruff keyed to the shaft which is a 8mm piece of Thompson shafting  ( case hardened and ground)   The flange of the crank bearing is let into the thrust washers such that the thrust washers can not rotate, and are radially supported on the ID by the stationary OD race of the needle bearings.   Easy to lubricate with some cross holes and as thrust loads are incidentals, it should be fine.   Drive to the oil pump will go to the left of the picture off the end of the output shaft....as is prototypical.   Some form of oldham coupling, but I'm entertaining moving the pump into the block but accessible from the left end.....stay tuned!

Dave

[Craig DeShong]

That crankshaft is deeeeeeeeeelux Dave.   Just superb!