Just got off the phone with Dustin at whipple does not support counter rotation.

Thanks for replying

Glad to hear that Turbojack. This engine/cam combo is new and I feel a little better now. I have had reversion problems in the past and I guess I am just a little paranoid.

If you have the heads off why not consider grinding your current pistons down and putting new main bearings in. It would be best to check your lowers anyway.

Dont need Dominators on that set up imho.

After complete disassembly of the engines and heads.
Cc'ing the merlin heads produces 116 to 118 cc.
According to Ross pistons with the original pistons
the static compression at 0 deck height would be 10.2
to 1. way to high to supercharge. I asked Ross pistons
If I could mill the pistons down to a acceptable comp
ratio. No Go . So New pistons were made by Ross.
the weights of original pistons were 694 grams. The weights of new are 704 grams. measurements of original to new are within .002. pretty much exact other
then the -28cc dish in the top of piston. The static compression now should be pretty close to 8.0 to 1.
The net diameter of the pistons are 4.492. The finished bore size is 4.499 to 4.500. This yields a total of approx.
.008 piston wall clearance. Pretty close to what i was running normally asperated. Ross racing wants that
.008 clearance with a raw water cooled marine supercharged block. The blocks and cylinder walls have approx 80 hrs n/a running time on them. Prior to that they were completely rebuilt. Boring with torque plate rods resized. line bored, decked. internally balanced.

I am replacing the rings with plasma moly speed pro rings file fit. you know the ones with plasma moly on top then the black cast iron second one, then of course std
tension double oil rings.

My questions are....
What ring end gaps?
What "clock" to set rings at?

Now this is the most important the cross hatches from the original bore are still apparent. I have two types of
Honning devices available the blue point three point
#400 grit. or the silicon carbide #180 ball hone designed for producing a 45 degree cross hatch.
Depending on who I talk to. They say use one not the other. Some even say not to use either. It must be
done on a engine borer.
In my school of thought and if money was no object
I would have brought them back to the machinist and did the three step boring process and got the new pistons 30 over. Rough bore, finish bore, then finish
pass the cross hatches.

Has anyone ever used a three stone or a ball Hone
to add cross hatces to somewhat fresh cylinder wall?
when installing new rings.Will this work????

Sorry, I'm so dam long winded!!!

Please respond with your Ideas or suggestions
Gerry

I don't think anyone makes a blower for reverse rotation.

thanks for the response.

I have a set of mooneyham 10-71's that should go on these 540's nicely.
On roots style blowers most front casings are symetrical
just swop them over and it drives the opposite
rotor. Install new vent because now its upside down.


Gerry

I decided to use the silicone carbide ball hone.
It achieved a cross hatch pattern in approx 25 seconds.
I am setting thee ring gaps at .028

Why would you run a counter rotating engine? I do not know any one that has a big HP engine that would do this. Change it over. Everything works better the same rotation and is far cheaper.

The boats running Arneson ASD8's surface drives.

I know it would be easier.