Bowl work for lowering CR??? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 36 (permalink) Old 09-29-2008, 12:21 AM Thread Starter
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Bowl work for lowering CR???

Where is material removed exactly to lower CR?



A) Make hole/opening bigger?
B) Make dish deeper?
C) Take material off hump (sides, but leave high in the middle?)??

Combination of A, B, C??
Or ??

Thanks.
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post #2 of 36 (permalink) Old 09-29-2008, 12:29 AM
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Re: Bowl work for lowering CR???

I was going to do the same as we do on our pulling tractor and do a combination of A and C. Roll the edge of "A" back a bit to help with heat and take "C" down and leave a little peak in the center.

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post #3 of 36 (permalink) Old 09-29-2008, 12:51 AM
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Re: Bowl work for lowering CR???

A little bit from "A" & "B" and more from "C" - taking away from "C" means you have to increase the ramp rate up to the point to keep the same swirl pattern in the bowl.

IE: http://s287.photobucket.com/albums/l...#37;20pistons/

I stole your cut-away picture BTW, I just measured thicknesses with 2-point calipers - didn't cut one apart.

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post #4 of 36 (permalink) Old 09-29-2008, 12:55 AM
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Re: Bowl work for lowering CR???

What would it cost for the machine work on all eight?

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post #5 of 36 (permalink) Old 09-29-2008, 03:11 AM
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Re: Bowl work for lowering CR???

Yeah, my pistons are going to look like that when they are done

Stock
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post #6 of 36 (permalink) Old 09-29-2008, 12:06 PM
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Re: Bowl work for lowering CR???

This is a .020 Mahle I was working on when the lathe decided it wanted to kill me. It chucked it at me but missed.

Anyway, the piston was damn near done except for putting the long radius on the bowl lip. It's a 48cc bowl, and you can see that I didn't touch the bottom nor the little "hat" in the middle. The wall is a mirror of the stock wall, it's just opened up.





That's what mine look like anyway. Minus the carnage. If I did it again, I would probably lay the wall back flatter to open up the bowl ID even more at the top. Something more along the lines of a cummins CR piston.
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post #7 of 36 (permalink) Old 09-30-2008, 11:14 AM Thread Starter
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Re: Bowl work for lowering CR???

Great!
Thanks for all the input.
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post #8 of 36 (permalink) Old 09-30-2008, 12:40 PM
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Re: Bowl work for lowering CR???

Quote:
Originally Posted by Charles View Post
This is a .020 Mahle I was working on when the lathe decided it wanted to kill me. It chucked it at me but missed.

Anyway, the piston was damn near done except for putting the long radius on the bowl lip. It's a 48cc bowl, and you can see that I didn't touch the bottom nor the little "hat" in the middle. The wall is a mirror of the stock wall, it's just opened up.


That's what mine look like anyway. Minus the carnage. If I did it again, I would probably lay the wall back flatter to open up the bowl ID even more at the top. Something more along the lines of a cummins CR piston.

Bet that was a fun little episode. Did you have to go change?




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post #9 of 36 (permalink) Old 09-30-2008, 12:58 PM
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Re: Bowl work for lowering CR???

here is a picture of the pistons in Ben's pulling truck
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File Type: jpg PULLING TRUCK 00401.jpg (192.3 KB, 125 views)
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post #10 of 36 (permalink) Old 09-30-2008, 02:26 PM
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Re: Bowl work for lowering CR???

Quote:
Originally Posted by UNLIMITED_DIESEL View Post
here is a picture of the pistons in Ben's pulling truck
Aries ?

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