 piston question, flat or dish |
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| nycchef |
 Jul 17 2008, 09:27 PM
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#1
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mechanical moron  Group: Members Posts: 952 Joined: 28-November 05 From: new york city n.y. Member No.: 5,202 Region Association: None  |
i have a set of mahle dish pistons from my 2.0. they seem perfect. i will be putting carbs and a web cam on it. what do i lose by staying with dish as opossed to flat. i'd like to save the $400. or so bucks.
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| hydroliftin |
Jul 17 2008, 10:13 PM
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Member Group: Members Posts: 373 Joined: 8-November 06 From: Vallejo, CA Member No.: 7,180 Region Association: Northern California |
QUOTE(nycchef @ Jul 17 2008, 08:27 PM)  i have a set of mahle dish pistons from my 2.0. they seem perfect. i will be putting carbs and a web cam on it. what do i lose by staying with dish as opossed to flat. i'd like to save the $400. or so bucks. When I built my 2.0 the machinist cut the dished mahle pistons down on top to make them flat, then machined the bottom of the cylinders to raise the compression to 8.5 to 1. Works great. This was done by Jay of Jay's Machine Shop in Santa Clara, CA. He is an old school machinist and has worked his fair share of Porsche engines in his time. |
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| SGB |
Jul 17 2008, 11:06 PM
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just visiting Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States |
QUOTE(hydroliftin @ Jul 17 2008, 11:13 PM) ...machinist cut the dished mahle pistons down on top to make them flat, then machined the bottom of the cylinders to raise the compression to 8.5 to 1. Works great. I'm guessing he made the (shorter) pushrods for your hydroliftin cam? I don't guess it is enough to really see, is it? |
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| nycchef |
Jul 18 2008, 08:28 AM
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#4
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mechanical moron Group: Members Posts: 952 Joined: 28-November 05 From: new york city n.y. Member No.: 5,202 Region Association: None |
so am i correct in thinking less compression = less hp? will the difference be significant? i don't want to build a 2.0 that pulls like a 1.7. i am not (obviously) well versed in these matters (IMG:style_emoticons/default/unsure.gif)
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Posts in this topic
nycchef piston question Jul 17 2008, 09:27 PM
SGB It would be lower the compression, but IDK how muc... Jul 17 2008, 09:38 PM
hydroliftin
I'm guessing he made the (shorter) pushrods f... Jul 18 2008, 02:47 PM jmill You are correct. Less compression = less HP. Doi... Jul 18 2008, 08:42 AM Bartlett 914 There are also Bus pistons that have a deeper dish... Jul 18 2008, 08:46 AM nycchef
There are also Bus pistons that have a deeper dis... Jul 18 2008, 09:22 AM Bartlett 914 Looks like 914 to me. My bus pistons have a smalle... Jul 18 2008, 09:36 AM nycchef
Looka like 914 to me. My bus pistons have a small... Jul 18 2008, 09:50 AM Bartlett 914 914 on left bus on right Jul 18 2008, 02:08 PM Bartlett 914 914 on left bus on right Jul 18 2008, 02:08 PM |
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