Machine shop time, How many hours to prep case, crank, bearings? |
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Machine shop time, How many hours to prep case, crank, bearings? |
Phoenix914 |
Sep 17 2020, 06:21 PM
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#1
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Member Group: Members Posts: 389 Joined: 6-December 06 From: Oviedo, FL Member No.: 7,322 Region Association: South East States |
Greetings All!
I just recently dropped off my 2.0 (GA) case and 71mm crankshaft to get checked at a local machine shop in preparation for a rebuild. Today they called and said for align bore, decking the registers, polishing the crankshaft, and mocking up the assembly with fitted and numbered main bearings it would be 30 hours of work. Does that sound reasonable? It's honestly a lot more than I expected and will add $$$ to my budget for this rebuild. Should I look for another case, maybe a 1.7, that is in better condition or has already been prepped? I'm not an expert builder and some things are worth paying for, but man that's a lot of money! Thanks for any advice! |
Jake Raby |
Sep 18 2020, 06:56 PM
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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 |
Made some progress today.. 2563cc for a 912E.
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Phoenix914 |
Sep 19 2020, 08:46 AM
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#3
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Member Group: Members Posts: 389 Joined: 6-December 06 From: Oviedo, FL Member No.: 7,322 Region Association: South East States |
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Jake Raby |
Sep 19 2020, 08:55 AM
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#4
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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 |
Made some progress today.. 2563cc for a 912E. Wow! Is the case coated with the same material as on the heads? I'm sure that is helpful for a stroker with more heat to dissipate. I'm going to check out the RAT FB page, too. No, the case is coated with Zinc Phosphate primer, and a fuel/ heat resistant enamel, as a two- step process. This paint and primer is what's used by Lycoming on their aircraft engines. The cost to professionally apply thermal dispersant coatings to the crankcase are extreme, due to the insane level of masking that is required. I have done it, but the budget for this engine didn't include it. We never have thermal concerns. All my engines utilize Nickies cylinders, and a well- proven combination, coupled to dyno optimization for ignition advance, and fuel enrichment. It has been close to 20 years since I had someone report an overheating concern. In that case, he had re- set his own timing, and created the problem for himself. |
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