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BFB
Samba Member
Joined: November 03, 2014
Posts: 1762
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 Posted: Sat Apr 17, 2021 5:57 pm Post subject: dishing pistons question |
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those of you who have dished pistons , how much were you comfortable dishing them? was there a special shape that you prefer? and any width & depth measurements that equal xx cc's?
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Forced induction can overcome a lot of obsticles that gets in it's way
"You are the Engineer and the Mechanic.
Build it your way not the way someone else does it. Their way might not work for you." - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
“ The monkey see monkey do mentality seems to run deep in VW people. "Gene Berg said it was so 30 years ago so thats the way it is" “ - bdkw1 |
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UK Luke 72
Samba Member
Joined: September 07, 2011
Posts: 2867
Location: Little Britain
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Ohio Tom
Samba Member
Joined: February 09, 2006
Posts: 1660
Location: Marshallville Ohio
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| Posted: Mon Apr 19, 2021 10:05 am Post subject: Re: dishing pistons question |
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I have cut .080" off cast aftermarket pistons with no issue. Crown is typically .250" thick, so you still have lots.
I think .100 is the safe limit on forged stuff. |
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Splitdog
Samba Split Personality
Joined: February 16, 2004
Posts: 4125
Location: Planet VW
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| Posted: Mon Apr 19, 2021 11:53 am Post subject: Re: dishing pistons question |
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I had Gene Berg dish mine 10cc. For turbo use.. Forged Mahles.
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mark tucker
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Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
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| Posted: Tue Apr 20, 2021 8:34 am Post subject: Re: dishing pistons question |
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| I like a trough/bathtub style dish, the depth depends on crown thickenss as well as amount needed to come out. also dont go to far outward, especialy with round dishes, thus loosing all the good quench. |
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VWporscheGT3
Samba Member
Joined: September 01, 2006
Posts: 2076
Location: Gardnerville, NV
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| Posted: Tue Apr 20, 2021 9:52 am Post subject: Re: dishing pistons question |
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| mark tucker wrote: |
| I like a trough/bathtub style dish, the depth depends on crown thickenss as well as amount needed to come out. also dont go to far outward, especialy with round dishes, thus loosing all the good quench. |
I really wish we had a like button or something like that for the samba. Mark is right on the money.
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Schnell, SCHNELL!
I like being wrong, Because, it is another opportunity to learn. If you stop learning from your mistakes than what is the point?
If you have any questions about Forged ICON 4032 VW pistons just shoot me a line. |
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UK Luke 72
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Joined: September 07, 2011
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Location: Little Britain
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
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| Posted: Wed Apr 21, 2021 3:16 pm Post subject: Re: dishing pistons question |
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just set the fly cutter to the size you want and sweep as you watch the dro...pretty eazy...also when doing the dish be aware of the top ring so you dont cause any issues getting too thin.and never make a square cut dish always a raidi at the bottom.witch also flows much better. Ive seen people dish pistons out tofar and lift the ring land area even break it off...not good.,
also if your doing it on a lathe...witch of fine to do.if the pistons dont have a accumulator groove add one to them between the top&second rings.some use a "v" groove some use a "c or half moon.I like the half moon, but they boith work.if you do a "V" I would have a slight flat at the bottom/valley |
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