A simple oil ratio question

[Scaaty]

Time for an oil argument. Here goes. if your non-injected 125hp Outboard (boat from manufacturer with motor) calls for 50-1, and you spend 90% of your time at 3700rpm instead of 5200, and run 40-1, are you getting a better mix (a little heavy) which should be better as 3/4 throttle does not give as much gas/oil. I should say that I have been doing this for 10 years already in my 20 footer with no problems, and I do punch it often too. It just a gas saver at 3500-3700, and WOT is a bank breaker. Take it away......

 

[ob]

Re: A simple oil ratio question

Your getting a richer oil mix which is better than a too lean one for sure.May tend to wet foul the plugs a little more in some engines but if yours runs well without excessive coking or plug fouling,then 40:1 is fine.Have you ever ran at 50:1?

 

[Boatist]

Re: A simple oil ratio question

Probably get better responce in the outboard area. <br />Some oil injected units reduce the mix to 100 to 1 for low rpms. For WOT they go to 50 to 1. Many I know that use motor only for trolling all day and never open it up use 75 to 1 to prevent plugs from fouling and less unburned oil in the water. I on the other hand mix for 50 to 1 then add just a little to be sure.<br /><br />Actually cost your more to run motor at 40 to 1. As the oil cost a lot more per gallon than the gas.

 

[JB]

Re: A simple oil ratio question

Outboard Non-repair topic.