Can anyone ID this piston?

[SS90]

I recall Dave Diprose telling me that one reason for the RG piston was he thought it may be stronger because there are no transfer holes and his TZ pistons were cracking.

Ignore the window just below the crown on this picture (the piston is designed for a very unique inlet set up (double intake, reed and disc), but on the piston on the right, you will see I have cut a small "relief" in the skirt.

When you are dealing with a "direct reed intake" like the TZ50, you are only looking for a pressure difference when it comes to intake.

My experience is that the small relief is all that is required.

The third picture is what I used to do with (similar) designs, and while it functions as I would hope, (the piston is VERY VERY high quality and lasts well even with such "cutouts"), however, the lack of material on the skirt acts like a "digger" and carves away the bore causing premature bore wear.

I now use the system (essentially) the same as the above right picture, but I use the better quality piston for reliabilty and the power is the same.

I would suspect that in the case of a TZ50, having such a wide intake area, a small relief such as this would be suitable,and (perhaps) may help with the cracking problem.

[SHELRACING]

Ignore the window just below the crown on this picture (the piston is designed for a very unique inlet set up (double intake, reed and disc), but on the piston on the right, you will see I have cut a small "relief" in the skirt.

When you are dealing with a "direct reed intake" like the TZ50, you are only looking for a pressure difference when it comes to intake.

My experience is that the small relief is all that is required.

The third picture is what I used to do with (similar) designs, and while it functions as I would hope, (the piston is VERY VERY high quality and lasts well even with such "cutouts"), however, the lack of material on the skirt acts like a "digger" and carves away the bore causing premature bore wear.

I now use the system (essentially) the same as the above right picture, but I use the better quality piston for reliabilty and the power is the same.

I would suspect that in the case of a TZ50, having such a wide intake area, a small relief such as this would be suitable,and (perhaps) may help with the cracking problem.

Thanks SS90, A very similar mod was suggested by TZ350. and appears to make good sense.