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Discussion Starter · #1 ·
Hi all , My porsche 912 with 2 9's ate the tranny awhile back ( 2k zilla at work) ,, I re did stuff and had a (size 60) chain set up with each motor going to each wheel .. the noise is unbearable ( so much that the sound keeps one from pushing it hard ) ... so I'm thinking of either a IRS rear or getting some gears , making it inclosed for oil ect . The 2 motors sit nicely under the car now , close to the axles , so I kind of would like to keep it this way . . I'd need a gear bigger than 9' so it could reach the motor without the axle hitting it .. or have some 3ed gear inbetween the two .. how wide a gear am I going to need , and what type is best for what I'm doing .
Steve Clunn

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70 Posts
Discussion Starter · #2 ·
Hello Steve,

I use to have Dodge Power Transmissions No. 60 chain coupler that connected
to the pilot shaft of the main motor to a GMC accessory drive unit. They
cannot take more then 2 degrees angular misalignment, more than .015 inch
parallel misalignment and not more than .300 inch shaft float.

The maximum rpm for these chain couplers without cover (cast aluminum grease
cover) is 875 rpm. With covers you can go up to 5000 rpm.

Normally a rear axle does not go this fast. If you have a motor going at
8000 rpm and you have 4:1 differential, than your axle speed will be about
2000 rpm.

If you misalignment are off you will get noise and lots of wear with out
covers.

If you motors are inline with the wheels axle, then chain couplers may not
work if you have to much jog in the rear suspension. Has to be like a
straight solid rear axle unit.

One thing you could do, is shorten up the independent axles which have
joints for this amount jog. Adapt a spline yoke that will go over a
spline/key adapter to go onto the motor. To keep these splines lubricated,
install grease covers over this couplers.

The spline yoke has to float at this connection, not bolted or set screw to
the motor adapter unit.

Dodge Power Transmission has all the items that may work. They also have 90
degree gear boxes with single or double outputs, you can get in any gear
ratio you want.

Roland


----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Sunday, September 02, 2007 10:32 AM
Subject: [EVDL] gear drive


> Hi all , My porsche 912 with 2 9's ate the tranny awhile back ( 2k zilla
> at work) ,, I re did stuff and had a (size 60) chain set up with each
> motor going to each wheel .. the noise is unbearable ( so much that the
> sound keeps one from pushing it hard ) ... so I'm thinking of either a IRS
> rear or getting some gears , making it inclosed for oil ect . The 2
> motors sit nicely under the car now , close to the axles , so I kind of
> would like to keep it this way . . I'd need a gear bigger than 9' so it
> could reach the motor without the axle hitting it .. or have some 3ed
> gear inbetween the two .. how wide a gear am I going to need , and what
> type is best for what I'm doing .
> Steve Clunn
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 
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