More about Mounts
 

	Here are the four plates necessary to mount the Miata 1.8L engine to the Roadster frame, using the stock mounting points on both. They put the motor at a height that (a) is nearly as low as possible while still allowing the oil filter to be (relatively) easy to remove and (b) puts the drivetrain level with the transmission output shaft at the stock height.
	Here is a detail shot of the driver's side plate, with the Roadster mount attached. All the bolts for mounting to the block are 10mm, but the lengths vary as the depths of the mounting holes are curiously irregular.
	To ensure clearance of the ribs in the block's casting, I had to use allen-head bolts to attach the mounts to the plates. The mounting points on the driver's side of the BP block form a nice rectangle. But, on the passenger's side, they form a wonky trapedzoid. Also, they are set back 10mm on the passenger's side, relative to the driver's side.
	Here is a shot of the driver's side frame pad extension in place. I bet most of the paint will be scraped off before the motor is bolted down. I would suggest powder coating all of these plates, but it was easier just to rattle-can them. These two are held in place with two 5/16" grade 8 bolts each. They should be able to take the forces of the slight cantilever.
	Two fine-thread, grade-8 5/16" bolts hold each pad plate in place. I backed the threaded front hole on each frame pad with a grade 8 nut and lock washer for good measure. In theory, each of these bolts should be able to take over 8,000 lbs. of tension before the heads pop off. I still don't love the cantilever, but I'm a sucker for ease and simplicity.
	Here is the PDF template for the plate that allows you to bolt the stock Roadster engine mount to the driver's side of the 1.8L Mazda BP engine. It is cut from 3" x 1/4" cold-rolled steel.
	Here is the PDF template for the plate that allows you to bolt the stock Roadster engine mount to the passenger's side of the 1.8L Mazda BP engine. It is cut from 3" x 1/4" cold-rolled steel.
	Here is the PDF template for the plate that allows you to bolt the Roadster mount attached to the Mazda 1.8L BP block to the stock driver's side pad on the Roadster frame. It is cut from 3" x 1/4" cold-rolled steel.
	Here is the PDF template for the plate that allows you to bolt the Roadster mount attached to the Mazda 1.8L BP block to the stock passenger's side pad on the Roadster frame. It is cut from 3" x 1/4" cold-rolled steel.