Cutting piston bowls
Getting ready to do a Reenterant delete to an engine I’m 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. I’d love to post pictures, but photobucket screwed me and I haven’t taken the time to figure anything else out. I know bowl geometry is a complicated design, so I’m 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 “Farm stock” class |
Well I finished them
https://uploads.tapatalk-cdn.com/201...1073c88c40.jpg Before and after. Before the bowl ID was 1.9, now it is 2.45” Went from 45cc bowl to 60cc. Should put compression at 14.5:1. I think that’ll work fine for what we are doing |
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Nice work! Sent from my iPhone using Tapatalk Pro |
Looks good
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I’m open for Criticism. I’m sure there is some way I could improve them
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I wish now I haven't junked 30 sets of stock pistons now lol ..
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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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I’m no machinist by any means, but I’m 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 couldn’t get my tool to give me the surface finish I wanted, but it did the job. Need to upgrade my tooling |
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. |
Going from 45cc to 60 dropped mine 3 points roughly
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3 points? Yow.
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But I was going from 17.5 down to 14.5
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Talked before i read.
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I’m curious to see how the straight walls change things up.
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