500 Pistons
Posted: 22 Jul 2011 09:35
I have been asked if it is possible to have some more forged piston made for the 500's. The company manufacture the pistons for the Ducati works team so quality is proven. They are also prepared to manufacture the 71mm bore pistons in sizes 71.10mm, 71.20mm, but also in sizes 72mm, 73mm, 74mm, and 75mm for those of you who want to go big.
The maximum size I would advise on the 69 bore barrels is 70mm which is what I have in one of my machines, owing to thinness of the liner. The 71 bore pistons can be bored to at the most 75mm. The advantage with using these pistons is that the gudgeon pin is correctly offset unlike the Guzzi pistons which I believe have ben utilized and the combustion chamber is the correct Morini shape.
There is a minimum order quantity of 12 pistons which can be any combination of sizes. I am still negociating costs but estimates are in the £130 complete with rings and pin, plus the vat.
If any body is interested in ordering any of these pistons in whatever size can they express an interest by e-mail and i will collate quantity and sizes and post on the forum what the progress is.
I have been asked a number of times about what to bore the barrels when fitting pistons. Your enine machinist shoud know that the clearance is in the piston, so that if a piston is marked 69.5mm then he should bore to 69.5mm and not add clearance as well!
The maximum size I would advise on the 69 bore barrels is 70mm which is what I have in one of my machines, owing to thinness of the liner. The 71 bore pistons can be bored to at the most 75mm. The advantage with using these pistons is that the gudgeon pin is correctly offset unlike the Guzzi pistons which I believe have ben utilized and the combustion chamber is the correct Morini shape.
There is a minimum order quantity of 12 pistons which can be any combination of sizes. I am still negociating costs but estimates are in the £130 complete with rings and pin, plus the vat.
If any body is interested in ordering any of these pistons in whatever size can they express an interest by e-mail and i will collate quantity and sizes and post on the forum what the progress is.
I have been asked a number of times about what to bore the barrels when fitting pistons. Your enine machinist shoud know that the clearance is in the piston, so that if a piston is marked 69.5mm then he should bore to 69.5mm and not add clearance as well!
