Sprint Piston Markings

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whitenviro
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Sprint Piston Markings

#1 Post by whitenviro »

Can anyone explain what the size markings mean on the top of these Sprint pistons? I initially thought they were 0.040 oversized, but measurements show them to be standard. These are original Mahle pistons, with no other markings. All are marked the same.

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Jon Tilson
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Re: Sprint Piston Markings

#2 Post by Jon Tilson »

They are graded on fitting tolerance IIRC. E is pretty good. Only F would be higher.

Jonners
Note from Admin: sadly Jon passed away in February 2018 but his humour and wealth of knowledge will be fondly remembered by all. RIP Jonners.
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whitenviro
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Re: Sprint Piston Markings

#3 Post by whitenviro »

Hmmm.
The Sprint manual only calls out F and G grades and gives their dimensions.
Any explanation for the 210 above and 040 below the E?

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soe8m
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Re: Sprint Piston Markings

#4 Post by soe8m »

210 is Mahle factory number. The "E" is an M, the mark of Mahle and the lower number is the production date. April 1980.

Jeroen
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