12v F2 Crankpulley Modification

I don't have any pictures yet about this mod so I will do the best I can with the description.

Background Info: The 88-92 2.2L Ford Probe, Mazda 626, and MX-6 all have the same cylinder block (F2) and crankshaft as the 87-93 B2200. These cars all have 12 valve cylinder heads. So the 12v F2 engine has a lot of interchangable parts with the B2200. Because of this the crank pulley is interchangable. Unless you are really good at mechanical modifications I only recommend this mod for trucks with manual steering and without A/C. I have not done this mod with any of these accesories, if someone has done this mod with A/C or PS options please let me know. This engine is also not for the B2000 since it has an FE block and not an F2. I have not done much research into the FE but parts from the other FE engines like in the Miata may work.

Parts you will need: Crank Pulley, Lower timing cover, lower alternator bracket, alternator belt, alternator pulley, belt tensioner, and upper alternator bracket (not the one that mounts to the engine). That list may not be complete but should be everything.

This modification also eliminates the pully for the fan so you will need an electric fan.

All of these parts are bolt-on, once you know where to look and what parts you need everything else is common sense, although there are one or two places where you can improve by making some mods.

The hardest part is getting all the parts off the car. The 12v F2 engine compartments are very compact, if you can't get underneath the car you might have to dismantel the entire passanger side of the engine compartment.

When you get everything installed you should only have one short pulley going to the alternator. The fan pully will no longer be used and you will have a belt tensioner to make changing belts a bit easier. This will all remove about 6lbs 15oz off what the crank has to turn. This does not include eliminated wind resistance from the fan, friction from the pulleys or the weight of the alternator armature.

Pulley Mod on stroked FE engine.

That picture is from David Coleman's page. I wish I had found it before I did my mod it would have saved me some worry. The arrow in red points to the belt tensioner and upper alternator bracket, green the lower alt bracket, turqoise the crank pully and pink the lower timing cover. Here is my setup:

B2200 Pulley Mod

If you want to take off some dead weight you can make a bracket to remove the fan pulley all together. Here is the one I made you can also see it in the pic above:

My custom bracket.

Doing this kills two birds with one stone, not only are you removing a little over 11.5 pounds in dead weight, you are also removing almost 7 lbs in rotational weight which is what really gives you the power. Some people may be concerned with harmonics, since both the 12v and 8v pulleys are used on the same crank and are both designed from the factory to work out the harmonics of the crank this does not reduce reliability or life out of your crank like and aluminum underdrive pully would. This modification will also increase your upper end rpm and gas milage since there is less resistance on the crank.