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Old 03-05-2018, 11:01 PM   #1
Bens
 
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Name: Bens
Title: Green Behind the Ears
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Piston Tapering

I am wondering if this is something I should pursue before I build my short block. 96 12v p pumped engine going in a 2.5 puller. Mahle# 930036535 pistons

I had the machine shop set the PTW at .0065, which is the loose end of mahles specs.

After doing more and more research this seems a little tight? These pistons already have a taper that is visible to the eye. I have a machine shop at work, and can easily taper them. Does anyone have any specs on how much to taper and such?

The truck is strictly a puller.

Thanks for any input!

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Old 03-05-2018, 11:09 PM   #2
Big Blue24
 
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The Mahle factory taper is just fine. But I would definitely open up the top ring gap to at least 030" and PTW at least 008"
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Old 03-06-2018, 06:35 AM   #3
mfsuper90
 
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Do Mahle taper the pistons more than factory cummins?

And when someone says tapered piston is where does the taper begin?
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