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Old 04-16-2018, 12:25 PM   #1
mfsuper90
 
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Cutting piston bowls

Getting ready to do a Reenterant delete to an engine Iím playing with.

The piston im working on has an offset bowl with a deep lip. My plan was to cut the lip straight down to the bottom radius of the bowl. Going to chuck it up in a four jaw chuck and center it to the offset bowl then cut the lip off. Iíd love to post pictures, but photobucket screwed me and I havenít taken the time to figure anything else out.

I know bowl geometry is a complicated design, so Iím not looking to totally redesign it. I just want to open the bowl up to keep from burning the lip off the piston when we run advanced timing.

Application is a 1006 perkins running a ďFarm stockĒ class
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Old 04-19-2018, 12:04 AM   #2
mfsuper90
 
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Well I finished them

Click the image to open in full size.

Before and after.
Before the bowl ID was 1.9, now it is 2.45Ē
Went from 45cc bowl to 60cc. Should put compression at 14.5:1. I think thatíll work fine for what we are doing
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í82 300D benz Bosch MW turned up, HX30, W/A Intercooler
MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
 
Old 04-19-2018, 12:14 AM   #3
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Quote:
Originally Posted by mfsuper90 View Post
Well I finished them

Click the image to open in full size.

Before and after.
Before the bowl ID was 1.9, now it is 2.45Ē
Went from 45cc bowl to 60cc. Should put compression at 14.5:1. I think thatíll work fine for what we are doing


Nice work!


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Old 04-19-2018, 08:54 AM   #4
Rich dzl

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Looks good
 
Old 04-20-2018, 09:09 AM   #5
mfsuper90
 
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I’m open for Criticism. I’m sure there is some way I could improve them
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í82 300D benz Bosch MW turned up, HX30, W/A Intercooler
MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
 
Old 04-20-2018, 07:18 PM   #6
Rich dzl

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I wish now I haven't junked 30 sets of stock pistons now lol ..
 
Old 04-21-2018, 02:32 PM   #7
mfsuper90
 
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Interesting side note, just torqued the head down. Specs are 80ft lbs then plus 180 degrees if it’s a medium length bolt (different lengths get different degrees). After running them, I set my torque wrench to 150ft lb, and the bolt I tested didn’t even budge.

I’m not a big guy, I had to have a 3ft cheater pipe to get them torqued. That’s a lot of torque on a 1/2” bolt
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í82 300D benz Bosch MW turned up, HX30, W/A Intercooler
MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
 
Old 04-21-2018, 09:40 PM   #8
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Quote:
Originally Posted by mfsuper90 View Post
Iím open for Criticism. Iím sure there is some way I could improve them
You did good. Thats how shops cut Dmax pistons, for the same reasons you did. What size radius did you put on the edge?
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Old 04-22-2018, 12:25 AM   #9
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You did good. Thats how shops cut Dmax pistons, for the same reasons you did. What size radius did you put on the edge?
I gave it the eye ball radius

Iím no machinist by any means, but Iím slowly learning. The grinder I use has no degree marks so cut them by eye with the regular tool I was using. Then I cleaned them up with some rough sandpaper and finished them with some rough scotch brite (red pads?). I couldnít get my tool to give me the surface finish I wanted, but it did the job. Need to upgrade my tooling
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'14 Ram Anarchy EFI, G56
 
Old 04-22-2018, 08:11 AM   #10
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I like it. I believe when Merchant cut mine, his machinist used a .25" radius. Yours look close to that.
I figured it lowered my comp ratio around .5 by doing so, too.
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Old 04-22-2018, 08:09 PM   #11
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Going from 45cc to 60 dropped mine 3 points roughly
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í82 300D benz Bosch MW turned up, HX30, W/A Intercooler
MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
 
Old 04-22-2018, 08:52 PM   #12
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3 points? Yow.
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2014 Chevy Cruze Diesel -- the daily driver
 
Old 04-23-2018, 07:57 AM   #13
mfsuper90
 
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But I was going from 17.5 down to 14.5
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í82 300D benz Bosch MW turned up, HX30, W/A Intercooler
MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
 
Old 04-23-2018, 09:30 PM   #14
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Talked before i read.
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Last edited by odieub; 04-23-2018 at 09:31 PM.
 
Old 04-23-2018, 11:58 PM   #15
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I’m curious to see how the straight walls change things up.
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Old 04-24-2018, 06:31 AM   #16
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Iím curious to see how the straight walls change things up.
Abunch of things are changing at once, so I wonít have a good report of how it changed performance
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MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
 
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