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| Main and Rod Bearing Brand and Construction type for Race Engine https://www.slantsix.org/forum/viewtopic.php?t=62111 |
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| Author: | SlantSteve [ Wed Mar 21, 2018 7:06 pm ] |
| Post subject: | Re: Main and Rod Bearing Brand and Construction type for Race Engine |
Quote: Quote: informative write up from Mahle
that is good stuff,amazing world that we live in, a post in the USA can get a follow up comment from AUS in minutes. a great time to be alive We had ACL bearings over here years ago, very good but I believe they have become part of the Mahle group these days. They had some very good and relevant info too. |
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| Author: | Charrlie_S [ Thu Mar 22, 2018 7:57 am ] |
| Post subject: | Re: Main and Rod Bearing Brand and Construction type for Race Engine |
When I ran my 170 slant six in "stock eliminator" I had no lube problems. Later, when I started hoping up the slant, I stared having some rod bearing issues (in particular number 5). Started using full groove mains and that solved the problem. Initally used upper shells in the lower position, but be a cheap skate I hatted to buy two sets of bearings, so started making my own, buy using a cutoff wheel in a die grinder, and grooving a stock lower shell. Not very deep or wide, and done free hand (they look like crap), but seem to work. I have never had a bearing issue, since, doing this. In my opinion, this is the Key statement in that write up. "This is the key point about the bearing groove design and indeed any bearing feature - the optimum design is entirely specific to the engine type and regime it is operating under. It is not correct to make a general assumption about the optimum groove design and apply it across a range of engines and operating environments. What is suitable for one engine may not be suitable for another. The engine analysed in this study had a main bearing that was sensitive to the difference in groove extents of 180° to 270° but a rod bearing that was not. This, of course could be entirely different for another apparently similar engine." So I will keep doing what works for me. Your results may vary. PS: I have used many different brands of bearings, and did not see any difference. |
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