2270(or so) Build |
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2270(or so) Build |
yeahmag |
Jan 8 2021, 12:47 PM
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#1
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Advanced Member Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
I'm starting to get the case(s) machined and inspected and parts ordered for my next generation engine. The car is mostly used for autocross.
78x96 96mm piston with 22mm wrist pin (stroker) 5.4" Type 1 Rod, 22mm wrist pin WebCam 86b/86c David Finch heads (from Len Hoffman many moons ago) 9.5:1 CR running on 91 octane pump gas CB Dry Sump (heavily modified) or Thorsten Piper dry sump pump Front mounted oil cooler There are a few crank options out there now: * DPR offset grind Type 1 journal * AA Performance Forged Type 1 journal * FAT Performance Forged Chevy journal I've read about a few 80mm DPR cranks breaking, so I was planning on staying under 80mm as I like the car to be able to rev. I was considering Chevy journals for ease of assembly, but the two cranks I've read about breaking were 80mm/Chevy journals. Is there any new information on cranks out there? Any input on the config? |
Jake Raby |
Jan 21 2021, 10:57 AM
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#2
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Everything I know about all the Porsche engines I work with came from direct experience, and mistakes. It is truly THE ONLY way to learn. It is also the hardest path.
I didn't have forums or etc to use as resource material. I did something, and if it blew up in my face, I knew not to do it again. The first time it isn't a mistake, but the second time the same thing is done, with the same result is is a mistake. Today the amount of resource material for these engines is almost too great. There's as much misinformation, as proper information, which is actually worse than no information. People are too timid these days. Build it the best way that you think, and if it blows up in your face, you'll understand what it's like to walk in the shoes of an engine builder. |
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