Frankencar1

Please, desperate man seeking help here! I have actually posted this before but I thought I would phrase my request differently.

If anybody out there is working on an 86-88 NA Rx7, I need your assistance! Now by "working on" I am specifically looking for someone who is pulling the motor or transmission out for any reason. I know I am asking a lot here, but I don't know how else to get what I need.

I am after a measurement that I cannot, to my knowledge, accurately get any other way. I need to know the distance from the surface of the motor (where it mounts to the transmission) to the surface of the flywheel (friction surface). The reason being, I need to duplicate this distance in my electric conversion of my 1986 NA RX7, and all my trouble has been revolving around Turbo vs Non Turbo.

If you are doing such a project, please respond or PM me, I'll do anything for that number (within reason)!!!

Aaron Cake

iTrader: (1)

Are you going to mount the stock flywheel to the electric motor? If so, I'd recommend against it. At about 27 LBs, the stock flywheel is quite heavy. Combined with the weight of the stator it is going to make for a very lazy shifting car. I'd suggest using an aftermarket light flywheel, as light as you can get. 12LBs aluminum flywheels would be a good choice.

This probably isn't the answer you are looking for but I believe it will be helpful.

I don't happen to have an S4 NA engine assembled and out of a car so I can't make that measurement. The friction surface is also below the clutch mounting ears on the flywheel.

Frankencar1

I am actually using a flywheel from Racing Beat, I don't think it's quite as heavy but I haven't weighed it. My problem is simply not knowing how far in to mount it. If I just used the distance from the font of the transmission to the start of the splines, would that be sufficient, or could that cause problems? Do I need to be more accurate than that?

Black Knight RX7 FC3S

iTrader: (7)

You want the measurement from the mating surface of the engine/trans to the surface on the flywheel where the clutch disk sits on?

I have my S4 n/a engine out sitting in the shed, Ill see about the measurement

edit
I had to take two measurements since the surface where the clutch disk sits is recessed from the ring gear.

from the engine/tran mating surface to the gear ring its 1 5/8", I then measured from the friction surface to the ring gear and its 5/16"
So from a little math the friction surface of the flywheel distance from the mating surface of the engine/trans is 1.3125 inches

The ring gear is almost exactly 5/16

engine surface to ring gear
https://i.imgur.com/u37tM.jpg

friction surface to ring gear
https://i.imgur.com/y1dXn.jpg

Evil Aviator

Why don't you just buy a junk yard motor for about $150 and take your own measurements? I'm not sure if you are going to get accurate measurements on "teh nternet".

Frankencar1

YOU ARE MY HERO!

Seriously, most people have just been writing me off, almost nobody has offered any real help, thank you thank you thank you!!!

rotoman2

I thought I read on one of the EV forums that you can direct connect your electric motor to the tranny shaft. The clutch pedal or a button on the shifter is used to cut the power to the motor when shifting but otherwise there's no need for a clutch. The spinning motor armature just adds a little momemtum to the input shaft but it's already synchronized with the imput shaft. This would seem to big advantage and simplify the install, if it works. Good luck. Hope you post a thread on your conversion. I'm waiting on my next blown engine to convert one of my 7's to electric.

SpikeDerailed

iTrader: (7)

Post picture of it. Factory and factory like rotary flywheels are balanced for the engine, to act as a counterweight to the rear rotor. That means it is off balance. ONLY use an aftermarket flywheel that doesnt have build in counterweight to avoid vibrating the whole project to peices.