 Compression changes |
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| -JR- |
 Dec 16 2004, 07:42 PM
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Life goes faster at 150MPH  Group: Members Posts: 276 Joined: 12-May 04 From: Victoria BC Canada Member No.: 2,055  |
Having never worked on a air cooled engine before I'm wondering if it's possible to increase compression of these motors in the same way you do with a conventional watercooled engine.
IE - Head shaving or piston changes? I've got all the bits from a 2L transporter engine that I'm going to put on my 914 EC case motor. However this will mean I will only have 7.3 : 1 compression still. I'd "like" to see it around the 9.0 region but I'm not sure if I can accomplish this without pistons. Has anyone got some feedback? Can I pull this off? Thanks! |
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| Dave_Darling |
Dec 17 2004, 06:02 PM
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Yeah, you really want to be careful about flycutting the heads. There was a thread on the Shoptalk Forums "Type 4um" that showed cross-sections of various 914/Bus/411/412 heads. Pretty scary how close the exhaust studs were to the combustion chamber in a few cases.
Don't take Mueller's word on the 0.080", though. You always always have to measure for yourself!! Then crunch the numbers to determine the current compression ratio. --DD |
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Posts in this topic
-JR- Compression changes Dec 16 2004, 07:42 PM
nebreitling i'm thinking you're gonna want pistons.
a... Dec 16 2004, 07:50 PM Mueller if I figured it out correct, you'd have to mov... Dec 16 2004, 07:55 PM -JR- Thanks for the tips so far.
I imagine that I CAN ... Dec 16 2004, 08:11 PM Mueller the cylinder heads can be cut, but it's the sa... Dec 16 2004, 08:17 PM -JR- Thanks Mueller. I just thought you might have tho... Dec 17 2004, 03:10 AM Joe Ricard Just measure your deck, Then like me measure abou... Dec 17 2004, 06:47 AM redshift I just put a sponge in there to take up some space... Dec 17 2004, 07:00 AM Jake Raby Don't think about increasing CR with the stock... Dec 17 2004, 09:09 AM -JR- Thanks Jake. I've heard the 2.0L heads were b... Dec 17 2004, 02:46 PM -JR- Thanks Dave, I've read Tom Slider's web pa... Dec 17 2004, 07:14 PM
scruz914 ... Dec 17 2004, 07:47 PM |
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