Thread: MR20DE 90mm crank?

QR20/QR25 cranks are very similar with SR cranks right? MR20DE was new engine to replace QR family. Just wondering, if MR20DE 90mm crank fit SR block...

Nissan MR engine - Wikipedia, the free encyclopedia

Any ideas?

Our rod ratio is already not the greatest.

We would not have enough room in there to use a QR25 crank and get a long enough rod to make it worth it.

Well, in an almost completely random thought:

Honda guy I know used Z32 rods when rebuilding his F series block in his AP1. Wouldn't cut out the possibility of using Honda rods, so long as they can be used.

Bearing journals would be a hurdle.

May be easier to just have a custom rod made.

In any case, using the QR25 100mm crank would take more effort than its really worth.

Good point.

Well, i was talking about MR20DE crank, which is 90mm.

If the main journals/bore are the same than it will. I think one end of the QR crank is longer than the SR. I think its the pulley side. Not sure what the difference is between the QR & MR crank.

why all the trouble to make a 90mm mr20de crank work when there are drop in and go 92mm cranks.

stratton.

How is it trouble if nobody knows if it's a drop in?

There's a possibility that it drops in, and you can probably get one at the junkyard for 50 already.

Thanks, that was my point.