Shoptalkforums.com

I have read through almost every post trying to find something on 101.6 pistons
in a water boxer. trying to build a 101.6 x 84 have all the calcs figures out for pistons and have found that 383 Chevrolet pistons 20cc dish with a 1.125 comp height would work. the comp height needs to be .125 to lower the compression. the problem if it really is a problem is that you end up with no quench aera. I know back in the 70s a lot of car manufactures to lower the compression ratio went with an open chamber cylinder head design to drop the compression ratio some also lowered the height of the piston down. in some that I have worked on as much as .125 we know that a good engine design works best with a quench aera. the delima is try the 383 pistons see what happens or have pistons made. anyone ever done and finished the combo. my shop has an engine dyno and all the data collecting software. testing the results is no problem.

Dougs auto

the problem will be the at lower end of the liner, i run 98mm OKRASA steel liners with the case machined out for the o/s o/d, if i machined them out to 100mm they would be right on the limit, the top end would just about be strong enough for a hypo build, but the stock cast liners are not thick enough or strong enough for over 96mm.

Through a little more research I did discover that the 2.2 type 1 scat engine kit that they sell does not have a suitable quench aera I measured the deck height on a scat motor that I built last year and discovered that at TDC the piston is down in the bore .080.plus with the .060 head gasket thats a total of .140 I did not plan to bore out the stock cylinders. LA sleeve sells sleeve blanks. the ones I need are 3.7 id and 4.7 od x 6.0 long. they are the rough cast sleevs that they use to make there finished sleeves, cost is just shy of $60.00 each.I am machining out a test fit sleeve from aluminum to get all the dimensions correct before I go and make the final cylinders . I would rather mess up a scrap picece of aluminum than a $60.00 sleeve blank.
I'll try it and see what happens. its only a lot of time and money.

Doug