Re: 2001 VW Jetta Homemade Coupler and Adapter Plate
Adapter plate overview
Since I did not have access to a CNC milling machine I figured I would use a two piece adapter plate (one plate attached to the transaxle bellhousing and the other plate to the motor) rather than one thick plate. I lucked out and found some scrap ½ aluminum plate for $1.50 per pound at the local metal recycling yard for this purpose. Prior to removing the flywheel from the gas engine I measured the critical distance behind the flywheel to the transmission mounting surface. This measurement was 0.175. My goal was to accurately duplicate this distance while using a 1 thick adapter plate and have the taper lock coupler fully inserted onto the motor shaft.
Due to the limited space in a transverse engine compartment (19.875 between tranny bellhousing and frame rail) anything much greater than 1 for the adapter plate thickness would prevent the use of the Kostov 11 motor which has a length of 18.05 from the mounting surface to the end of the fan housing. Motor options for transverse engine applications are limited due diameter and length restrictions.