 Engine Quiestion..P&C's. |
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| MikeM |
 Apr 26 2011, 05:47 PM
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Senior Member  Group: Members Posts: 564 Joined: 16-May 10 From: Calgary, Canada Member No.: 11,733 Region Association: Canada  |
Hello all...I was examing bills from previous owners of my car, which is a 1974 2.0 liter 914, LE. It appears that one PO had the pistons and cylinders replaced with bus parts that are 94mm. I don't have the part number here at work but I did some quick searching earlier and it looks like they are indeed bus parts.
Question is...how should this engine be "driveability" wise? What should it feel like? How would it be with proper 914 pistons? Would I notice a difference? Would it be worth changing them? The car has only done about 6000 miles since the pistons were installed. Oh..GA case and working D-jet. Thanks as always... Mike |
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| aircooledtechguy |
Apr 26 2011, 06:54 PM
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The Aircooledtech Guy Group: Members Posts: 1,966 Joined: 8-November 08 From: Anacortes, WA Member No.: 9,730 Region Association: Pacific Northwest |
IMHO, if you can change them yourself and feel comfortable doing it, I would swap them out for a set of 96mm flat-top pistons in a heartbeat. With bus pistons, your compression will be in the low 7s which can make for a very lazy feeling engine that lacks the crispness that higher compression (low to mid 8s) gives.
It's a pretty simple swap over. Just check deck height and CC the chambers of your heads and run the numbers through a compression ratio formula. Bus pistons add about a 15cc dish to lower the CR. . . You don't need or want that in your Porsche. |
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Posts in this topic
MikeM Engine Quiestion..P&C's. Apr 26 2011, 05:47 PM
MikeM Thanks for that Nate...anyone else? Apr 26 2011, 08:42 PM r_towle stock versus what you have (if they are bus piston... Apr 26 2011, 08:47 PM euro911 I agree ... drive it the way it is, especially whe... Apr 26 2011, 10:21 PM McMark If you can do it yourself, it's worth it. If ... Apr 27 2011, 12:47 AM MikeM Thanks for the replies...Yup, I would expect to fi... Apr 27 2011, 09:40 AM
euro911 Yes Apr 27 2011, 10:19 AM |
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