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  Need help 1970 mk3

 Created by: JesseVoss
Orig. Posting Date User Name Edit Date
May 7, 2018 09:05AM 66Cooper'S  
May 7, 2018 05:07AM JesseVoss  
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 Posted: May 7, 2018 09:05AM
Total posts: 3334
Last post: Oct 7, 2018
Member since:Feb 26, 1999
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Quote:
Originally Posted by JesseVoss
Hi,

I have a 1970 MK3 with a supposed engine I am trying to restore. I ordered new pistons but the new ones are not the same size. The original pistons have a 71.6mm (2.82in) diameter, the new pistons are 70.8mm (2.79in). Which are the correct size piston for a 1275cc engine?
What brand of piston? What Markings are on the piston?
47 years ago Hepolite produced a powermax piston 20747/KR 2.78" or 70.612mm
So your new pistons are probably standard, and your original pistons were probably +0.040"
Now as you ask what is the correct size piston for a 1275 cc engine that is usually determined between you and your machinist.
Options are to go +0.060" over (or to 73 mm, or 73.5 mm) i.e. around 1380

 Posted: May 7, 2018 05:07AM
Total posts: 1
Last post: May 7, 2018
Member since:May 5, 2018
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Hi,

I have a 1970 MK3 with a supposed engine I am trying to restore. I ordered new pistons but the new ones are not the same size. The original pistons have a 71.6mm (2.82in) diameter, the new pistons are 70.8mm (2.79in). Which are the correct size piston for a 1275cc engine?

Please help.

I didn't find the right soltion from the Internet.

References:
https://www.northamericanmotoring.com/forums/classic-mini-talk/326392-need-help-1970-mk3.html
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Thanks