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Author Topic:   VRO
70_Katama posted 06-12-2001 10:12 AM ET (US)   Profile for 70_Katama   Send Email to 70_Katama  
Good Morning all

I have a 1988 90hp Evinrude "VRO". Does the "VRO" indicate that it configured for direct oil input? I currently add the oil to the gas directly.


triblet posted 06-12-2001 10:23 AM ET (US)     Profile for triblet  Send Email to triblet     
Yes. Variable Ratio Oiling.

However, some of those older VROs were pretty
unreliable. You might want to keep on


Kelly posted 06-12-2001 12:04 PM ET (US)     Profile for Kelly  Send Email to Kelly     
A 70hp 1987 Johnson came with my 17'. The oil line was plugged, and the previous owner indicated that he mixed oil with the gas. I have had mechanics say that is what they would recommended. I think that option is even mentioned in the manual I bought for that vintage OMC. I have decided to just continue to mix the oil rather than try and make sure that that mechanism works on that old of a motor. Kelly
70_Katama posted 06-12-2001 12:36 PM ET (US)     Profile for 70_Katama  Send Email to 70_Katama     
Thanks for the input guys. I'll continue to mix the oil/fuel manually.


Ferdinando posted 06-12-2001 01:01 PM ET (US)     Profile for Ferdinando  Send Email to Ferdinando     

Just for the record, I've heard of all the horror stories associated with the early VRO's, however I purchased a new 1986 70 hp Evinrude (with a 15' Whaler attached) and ran the VRO from 1986 till 1998 without a problem, ever! Sold it and as far as I know it's still going strong (the VRO). As I said just for the record. Fred.........

triblet posted 06-12-2001 06:37 PM ET (US)     Profile for triblet  Send Email to triblet     
The option of mixing oil with the gas is
mentioned in the manual for my '97 90HP VRO
Evinrude. They even tell you to plug the


where2 posted 06-15-2001 04:28 PM ET (US)     Profile for where2  Send Email to where2     
A little over a year ago Trailer Boats magazine did an article on the pitfalls of the VRO system, and how to avoid them. The main problem that gained VRO a bad name early on was the use of fuel lines and rubber components that were not alcohol compatible when alcohol mixed fuels were first being introduced in '84-'87. The main source of blown power heads from VRO is actually related to introduction of air into the fuel line causing wild oil/fuel ratios due to foaming in the VRO pump where oil+fuel get mixed. The article indicated that with the last revision of the pump using the latest materials, and a fuel system that leaks no air, VRO works as it was supposed to with no ill effects on the longevity of the engine.
I personally haven't stopped mixing my gas because I don't have a good place to mount the oil tank. I wish OMC had followed Yamaha and mounted the tank on the engine on the 70Hp.
whale123 posted 06-17-2001 08:34 PM ET (US)     Profile for whale123  Send Email to whale123     
very rarely oils .......Vro

Plug them pre 90's

Steve Leone posted 06-26-2001 07:26 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
I agree! There are kits available to convert a VRO back to a regular fuel pump. If you have bought a replacement VRO pump you will feel it in your wallet. Steve
Bigshot posted 06-27-2001 10:22 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Do not mix if you still have the pump connected! I realize you all know this except maybe the guy who originated the post.
Steve Leone posted 06-27-2001 12:19 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
Good call Bigshot!!!
triblet posted 06-27-2001 09:30 PM ET (US)     Profile for triblet  Send Email to triblet     
The manual for my '97 90HP VRO Evinrude ALSO
says you can premix AND run the VRO, but
you'll have twice the oil. They actually
recommend this under two circumstances:
Breakin, until you KNOW the VRO is working
because the level in the oil tank goes down,
and high performance (i.e. racing).


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