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Author Topic:   oil consumption 85 Montauk/ 85 90hp vro 'rude
whalertex posted 06-17-2004 11:58 AM ET (US)   Profile for whalertex   Send Email to whalertex  
Much to my chagrin after a recent trip I noticed that oil consumption was nil. I checked my compression, which was still good in all the cylinders, and decided to attack the problem at the beginning of the line since it didn't seem like I burnt up the motor. When I removed the pickup from the vro oil tank, I discovered that some nimrod (or the factory) had installed a piece of foam rubber sponge held on with a cable tie to act as the filter for the pickup. The sponge had almost totally disintegrated and little bits of it were clogging the intake at the bottom of the pickup. Blew out the pickup, installed a newer style nylon sock filter on it, siphoned out the old oil from the tank and replaced with new, then reconnected VRO per instructions in Clymer manual. Next trip premixed 50:1 in gas tank, and used about 18 gallons of premixed gas and approx. 1 pint of oil from Vro resorvoir, so I think I may have solved the problem. My question, is my oil consumption is still too lean (150:1)from the VRO or too rich at about 36:1 actually. Does the vro somehow sense there is oil already premixed in the gas? The Motor seems to run fine and the cylinders look ok through the spark plug holes. I realize that my warning buzzer is burnt out I probably ought to tear down the fuel system and make sure its not clogged elsewhere but this sponge filter has probably been disintegrating for a long time and small peices have probably been through the fuel system and the motor already.I don't want to take it to the shop if it's not necessary at this time of year. Any ideas on what else I should do? Sorry this is so long. Thanks in advance.
Joe Kriz posted 06-17-2004 02:02 PM ET (US)     Profile for Joe Kriz  Send Email to Joe Kriz     

The Oil Ratio is VARIABLE. Thus, VRO..
My mechanic told me that at idle, the oil ratio is far less then when running at cruise speed. Some people say around 60:1 or 100:1 at idle and of 50:1 or 60:1 at cruise.

Do you see a little smoke from your engine at idle without using the pre-mix?
If so, you are probably get the correct amount of oil at idle.

It is always important for the warning horn to work so I would suggest replacing that. Easy replacement.

whalertex posted 06-17-2004 04:38 PM ET (US)     Profile for whalertex  Send Email to whalertex     
Thanks, Joe. I knew it was variable, but I was under the impression it was more oil at idle and less at cruise. I should have mentioned that I was cruising mostly between 18-30 mph. So given that its more oil at cruise, I should have burnt more than 1 pint, right? Haven't had the chance to use all the premix in the tank yet, but I want to be sure the engine is getting oil, a little too much is better than too little, no? I'll replace the warning horn.
Joe Kriz posted 06-17-2004 05:25 PM ET (US)     Profile for Joe Kriz  Send Email to Joe Kriz     
Always better to be safe then sorry for sure.

I always have to figure it out in my head like this:
50:1 equals
50 gallons of fuel to 1 gallon of oil
25 gallons of fuel to 1/2 gallon of oil or 2 quarts
12.5 gallons of fuel to 1 quart. This works out great for 12 gallon fuel tanks.

Now, given the above, the VRO uses less oil then pre-mix because it has a better ratio at cruise something like 60:1 roughly, and if everything is working correctly.

So, 1 pint does not seem enough for 18 gallons but, on the other hand, I never used the amount of oil I thought I should use, either on my 1985 70hp Evinrude with VRO, or my 1985 150hp Evinrude with VRO. I always look for smoke when the engine is idling and then at the end of the day I look at the Oil Tank to make sure it had used some oil. I know this is not a scientific method, but my engines are still running fine.

One thing I did do on my 1985 150hp Evinrude when I first bought it as the engine was used, was to purchase a brand new Oil Tank. I think I paid $25.00 for it on eBay. For my 1985 70hp Evinrude, the engine and everything else was new when I bought it.

Maybe someone else here as a few more scientific ideas.

Bigshot posted 06-18-2004 01:48 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
It is more like 150+:1 at idle and 50:1 at WOT. Cruising will be about 100:1 so a pint is not out of control.

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