HELP- I ran my Chrysler 55hp with a 100:1 mix instead of a 50:1

[backwoodsboy]

Today i had a bad day, i added three gallons of gas to my 6 gallon tank, that was mixed to 50:1 already. I stupidly forgot to add the oil to the three new gallons of gas I took the boat to the lake and it worked fine for about 20 min, then it had issues idleing ( it has never had idleing issues). After about 20 min i remembered my mistake and added the oil to the gas. I let the motor sit on the lake for about 2 hours, and then fired it up and drove home. My question is did i permenatly damage my motor, or is there any damage done? The motor is a 1970 Chrysler 55hp.

Thanks so much guys for the help.

 

[tater76]

Re: HELP- I ran my Chrysler 55hp with a 100:1 mix instead of a 50:1

If luck is on your side, and it sounds like it was, then you just got it hot from lack of lubrication. A compression test is in order, as any damage would show up in the cylinders. In my opinion, if it got you home and it ran fine all the way then your good to go.The 55hp in my avatar has limped home on one cylinder more than once, these are tough little motors. If you don't have a compression tester you can rent one from most autoparts stores. Anything above 100psi on each cylinder is workable.

 

[Frank Acampora]

Re: HELP- I ran my Chrysler 55hp with a 100:1 mix instead of a 50:1

For a couple of years, OMC recommended 100-1 in their engines. They stopped, not because of engine damage, but because at 100-1 there was not enough residual oil to prevent corrosion on standing or storage. OMC also said that at 50-1 ratio, their engines could be run WITHOUT any oil for several hours if RPM were kept below 2500 (I think).

50-1 ratio is recommended because that is what is best at full throttle. At less than full throttle, the necessary amount of oil goes down.

So, at 100-1 it is not likely that you did permanent damage.