Goin Manta - 2.5L Conversion Kits

OK. I have 6 2.3L cranks and will be trying to clear out all my stuff.

I will have all the cranks balanced, offset ground to fit BMW M10 rods, and have the weights shaved to fit the 1.9L Block better, they will come with the main bearing set and shims as shown above : $1300

If interested in a 2.3L Crank to have your own machine shop build to different recipe.. the crank itself with no bearings - $600

As you can see the 2.3L Cranks is a bit bigger than the 1.9L/2.0L Crank..

Anyone that wants to preorder a complete kit while the cranks are getting done..

I will offer this one time.. a complete kit.

This kit will convert a 1.9L to a 2.5L or optionally 2.6L

Kit will include :

The modified Opel 2.3L crank / Crank bearing set / Thrust bearing shims for the main thrust bearing - $1300

New pistons custom set modified to be piston steered - $900

New BMW Rods (With rod bearings) mounted to the pistons - $400

Total is $2600 for the complete kit.

ANY machine shop with this kit and a 1.9L block can do the work. All they have to do is bored the block, and mount the crank. Then they will need to modify and clear out any "hits" inside the block.

Recommended you get your head upgraded at the sametime to big valves as well.

Compression will be close to 10.5:1 with a 1.9L so recommend you have the head opened up if you want to lower the compression, and get a bigger cam.

In our build we dropped compression by pocketing the valves, and using a thicker cometic head gasket. With those two tricks we got compression below 10:1 so it could easily run on pump gas. Don't do that and you get a bigger cam would work as well but may require octane boost.

Note the pistons in these pictures are using the 2.4L Rod and are Ford pistons. That setup required more work to the core block internals. So after talking to the shop, they felt the easiest setup to replicate and for another shop to install will be the BMW rod version.

If you want the replicate the Opel 2.4L Rod w/ Ford 2.3L piston version, that can save you about $500 but you will have to have more work done to your block and the displacement would drop to 2482 cc. and bore increases to 97mm.

My shop has been slow to get the motors out, but the kits I can get done. So this is an option for anyone wanting a big motor. Without the cost and hassle of trying to find one in europe, have it shipped here and rebuilt. Also cheaper in the long run.