I finaly got my S52 pistons yesterday. I need to calculate the compression of the new set up. I dont have an engine apart right now to get the combustion chamber volume or the crushed head gasket thickness. I was wondering if some of you fellow enthusiest can help with this.
I need average combusiton chamber volume of a stock head that has not been planed or machined flat since that will alter the volume.
I also need an accurate thickness of a used crushed head gasket.
I also need an accurate dimension of a stock piston pin diameter and the thickness from the top of the piston to the top of the wrist pin hole so I can determine the piston pin height.
I will share all of this info and the dimensions of the S52 pistons so that we can have this info for all to use if another person wants to build another S52/M42 hybrid engine.
S52 piston dimensions
wrist/gudgion pin diameter 22mm x 56mm wall thickness of 4.6mm I think
these can lightened they weigh 108.5 grams
Piston diameter 85.75mm but they are stamped 86.365mm
I assume this is the cyl. bore for these pistons
pin height 19.8mm
top ring thickness 1.15mm
second ring 1.5mm
oil ring 1.5mm thin rings low friction
piston weight with pin and rings 433.5grams
ring package thickness 11mm
top ring land thickness 8mm
I need to find the volume of these pistons, I will post it when I get it. I found the volume of 15cc in the piston dish.
I hope this is helpful
I think this is a good alternative for those looking for more power for cheap. These pistons were purchase in the US and for cheap. Since these pistons are normaly used in sets of 6, a broken engine can yeild a good set of 4 just what we need.
If i could get the same dimensions from a stock M42 piston I would apreciate it.
Thank you
Topic: My pistons have arived (Read 3337 times)