Mahle 286110 question

Tony R

Tony R

New Build is For Sale.
Joined
Dec 23, 2007
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808
What is a good compression ratio figure for every .100 of flycutting, for these pistons? I need to cut mine to about .175 and was thinking to go ahead and cut them to .250 incase i decided to go a diffrent cam route.
 
Stock volume on the 286110 is 47.1cc. As was mentioned, it depends on the diameter of your pockets, but you're looking at roughly 1 point of compression per every 0.100" on depth.

As an example, using a 49mm (1.929") INT pocket and 46mm (1.811") EXH pocket with a generous 2mm (0.078") radius for blending and deburr:

No pocket 47.1cc 16.5CR
0.050" 49.5cc 16.0CR
0.100" 51.8cc 15.4CR
0.150" 54.1cc 15.0CR
0.200" 56.4cc 14.5CR
0.250" 58.7cc 14.1CR

Depending on where your original compression starts out, the absolute numbers will change but the difference is roughly the same.
 
Pat out at Ross gave told me one time that 1 gram=Xcc's. I don't remember the numbers, and I'd imagine it could change with the alloy.
 
Which Mahle pistons are these? Similar to Cummins marine? The Common Mahles that a lot of people/pullers run?

I am not up on all the Mahle part numbers.
 
Very commonly used.

286110.jpg
 
Plus outer edge bevel, valve depth, block head decking etc. I'm guessing these are pretty small changes tho.
 
Weston, you got the specs in pic form like that for the 210's?
 
I guess that was stupid of me, they should be the same except a 43cc bowl right?
 
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