Cheap 2.0 build for track, engine build questions |
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Cheap 2.0 build for track, engine build questions |
RFoulds |
Mar 19 2019, 04:16 PM
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#1
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Green Teen 66 Group: Members Posts: 837 Joined: 10-August 09 From: La Quinta, CA Member No.: 10,656 Region Association: Southwest Region |
To race in VARA D Production 2 liter class, I want to build a solid reliable motor. I am limited to the stock crank (71mm stroke), and stock piston size (94mm)
I have on hand a GA short block and a NOS set of Mahle 94mm P&C's, 8:1cr. I also have a nice pair of Italian Weber 40's. So my thought is, with the right machining and balancing, I should be able to build a solid reliable 2.0, that can produce 120hp . (wild guess) Of course, what version of Webcam to use is still TBD, and heads. questions I have: am I kidding myself that the stock Mahle cylinders can handle continuous high rev's and heat? will 44IDF carbs be significantly better than 40 or will the size of the jets matter most? besides balancing crank, rods and flywheel, what machining should I consider? (Have not considered the heads yet.) |
infraredcalvin |
Mar 30 2019, 10:46 AM
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#2
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Distracted Member Group: Members Posts: 1,517 Joined: 25-August 08 From: Ladera Ranch, CA Member No.: 9,463 Region Association: Southern California |
How competitive do you want to be? 120 hp will keep you at the back, no matter how great of a driver you are. It has been a while, but I used to run in that group with a 180hp 40 hr engine in a very well set up 912, I was still green but usually finished in the top 15 of a 40 car run group, and on the podium in my class. I always hated watching a “2.0” 911 pull away easily on the front straight at CA speedway.
i agree with Chris, bump up your target hp and you’ll have fun in midpack. |
mepstein |
Mar 30 2019, 11:22 AM
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#3
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914-6 GT in waiting Group: Members Posts: 19,272 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
How competitive do you want to be? 120 hp will keep you at the back, no matter how great of a driver you are. It has been a while, but I used to run in that group with a 180hp 40 hr engine in a very well set up 912, I was still green but usually finished in the top 15 of a 40 car run group, and on the podium in my class. I always hated watching a “2.0” 911 pull away easily on the front straight at CA speedway. i agree with Chris, bump up your target hp and you’ll have fun in midpack. I think 2.0 - 911’s are making 250-280 these days. |
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