Marine Lubrication
09-27-2007, 04:00 PM
#1302
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Location: Manitowoc, WI
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On a gear oil note, have you guys seen this yet? http://www.modernoils.com/g2457GearOilWhitePaper.pdf
09-27-2007, 10:57 PM
#1303
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What are your thoughts on Schaeffer Oil...particularly the micron molly straight blend?
http://www.schaefferoil.com/110_racing_oil.html
I've heard of good things in the aviation community which I'd think suits well in the marine industry. Some synthetics have quite a [surprising] variation in viscosity with respect to temperature. Also, what is the right combo of machining reliefs in the rod end bearing sections with respect to viscosity? There is definitely a tradeoff with getting oil to process through the bearing and take heat away (low viscosity, big reliefs) with potential breach of the oil film versus maintaining proper oil film thickness to prevent metal to metal contact (no reliefs, high viscosity). But..."deadheading" the oil flow through the bearings causes significant heat buildup and major reduction in oil viscosity and oil life even though that deceiving oil pressure gage tells you the false notion that things are ok. Thoughts? Chevy bottom ends seem to be the weakest link. And why is it, many dragsters run mineral based oils, big rod end clearances or preferably reliefs and single weight oils? Granted, their bottom end stress exposure is short lived, but, they are most interested in keeping those motors together with the least amount of teardowns as possible!
What about coatings for the crankshaft to make it less susceptible to bearing material transfer if there is metal to metal contact? There are coatings out there with 95 Rc hardness and 0.09 coefficient of friction compared to chrome which is 70 Rc hardness and 0.2 coefficient of friction...these coatings are tougher and slipperier than nitriding...Bravo gear upgrade?
http://www.schaefferoil.com/110_racing_oil.html
I've heard of good things in the aviation community which I'd think suits well in the marine industry. Some synthetics have quite a [surprising] variation in viscosity with respect to temperature. Also, what is the right combo of machining reliefs in the rod end bearing sections with respect to viscosity? There is definitely a tradeoff with getting oil to process through the bearing and take heat away (low viscosity, big reliefs) with potential breach of the oil film versus maintaining proper oil film thickness to prevent metal to metal contact (no reliefs, high viscosity). But..."deadheading" the oil flow through the bearings causes significant heat buildup and major reduction in oil viscosity and oil life even though that deceiving oil pressure gage tells you the false notion that things are ok. Thoughts? Chevy bottom ends seem to be the weakest link. And why is it, many dragsters run mineral based oils, big rod end clearances or preferably reliefs and single weight oils? Granted, their bottom end stress exposure is short lived, but, they are most interested in keeping those motors together with the least amount of teardowns as possible!
What about coatings for the crankshaft to make it less susceptible to bearing material transfer if there is metal to metal contact? There are coatings out there with 95 Rc hardness and 0.09 coefficient of friction compared to chrome which is 70 Rc hardness and 0.2 coefficient of friction...these coatings are tougher and slipperier than nitriding...Bravo gear upgrade?
10-19-2007, 01:30 PM
#1304
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just found mobil 1 ep at wally world but it now has a gold cap. any know how good this is? has anyone tested it? have been using the silver cap and been very happy in boats trucks and cars!!! oops-I just reaad the old posts looking for oil filter info & read that I just bought the gold cap crap. question- did my local wally world buy some old stock ( they have only had the silver for a LONG time) or could this be a new formulation again?
Last edited by Jamie Bowman; 10-19-2007 at 01:47 PM. Reason: just read old posts
10-28-2007, 02:47 PM
#1307
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10-29-2007, 12:42 PM
#1309
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I hate to say it, but you usually get what you pay for & if so,then why is gold cap more $, I know the gold cap down here has contest and prize info on it that runs from about june to october 2007
