Goofed up today. No oil in gas. Please comment.

[erosenwinkel]

Went to river today, had five gallons of premixed (50:1) fuel in tank. Decided to stop and get gas. Put exactly 10 gallons of gas in gas tank of boat. Thought to myself . . . I must remember to put oil in when I get to the launch. I didn't. I idled out of the channel (100 yards). Went at 25% to 35% power for about 1-2 minutes and then remembered I hadn't put the oil in. Shut engine off. Dumped oil in and went about the rest of the afternoon (hour and a half or so). I hope I didn't cause irreparable harm to my engine. 1258x5a. 125 hp 1985. Rebuilt last winter. Had maybe 25 hours on the rebuild. Engine performed fine and didn't show anything abnormal in the time I was out on the water. No smoke. No overheat. Nothing noticeable. Someone please try to reassure me. Thanks, Eric

 

[riptorn]

Re: Goofed up today. No oil in gas. Please comment.

Cleaned your plugs up and piston heads. I myself wouldn't worry about it. Just log it as a clean out run (13 to 1).

 

[BonairII]

Re: Goofed up today. No oil in gas. Please comment.

If it's going to worry you, just run a compression test on it to confirm no damage.

Doubtful, you did anything major to motor running it lean(oil wise) for just a few minutes.

In the future, make sure never to put gas in tank without putting oil in it immediately. The whole "I'll do it later" thing will bite you in the butt.

I've had a few "oh crap!, did I already put oil in the tank?" moments. Ended up using that gas on my mower cause I just couldn't be sure if I had added oil or not when I topped the tank off.

 

[roscoe]

Re: Goofed up today. No oil in gas. Please comment.

Running at 150:1 ratio for a short time should do no damage. Its even better that you were at idle most of the time.

corrected.
My brain figured 1 third of the recommended oil, but posted 3x's oil.


150:1 isn't going to kill the motor run at idle, for a short time.

 

[jerryjerry05]

Re: Goofed up today. No oil in gas. Please comment.

You should always put the oil in first.
Adding it afterwards doesn't allways mix the oil.
It just goes in and can pool in the bottom and get sucked up first.
Gas and oil can even seperate after a while.

 

[oxmax360]

Re: Goofed up today. No oil in gas. Please comment.

Your motor should be fine, but like jerry said oil first.

 

[healey8390]

Re: Goofed up today. No oil in gas. Please comment.

Don't feel so bad. My 83 chrysler is the same, down to the ignition as your "first gen" force which was still 100% a Chrysler! Anyway, a couple years ago while headed to the ramp I was at WOT or close too it and noticed a faint beeping noise. I thought it was the low voltage alarm on the fish finder but it wasn't. I'm wondering WTF is that noise comming from?? A few seconds later the engine dies! THEN that faint noise gets 10 times louder and not becauze the motor was off! Oh crap it's the OH buzzer!!! Too late;( I forgot I JUST put one in to avoid what just happened. Spun the impeller and well my "blonde moment" turned into 2 new pistons, one being .02 over due to some nasty scuffing at 6 and 12 oclock. Feel better??Did the overhaul myself, got some great advice here. Feel

By the time you were diluted you were at approx a 155/1 ratio!!! Sounds bad but that comes out to about .8 ounces a gallon. Probably just enough to cover your arse for those couple/few minutes You didn't even get a OH buzzer so I feel pretty confident your ok! You might want to add an extra ounce a gallon for the next 5-10 gallons to baby it a little and help it towear in any possible wall damage not noticeable to the naked eye. And check comp like the others said.

 

[healey8390]

Re: Goofed up today. No oil in gas. Please comment.

Guys where are you getting those ratios from out of curiosity? 17-1 is 7.5 OZ a gallon and 13-1 is 9.8 OZ a gallon.

He had 5 gals of 50-1, that's 12.5 OZ. 50-1 is 2% oil. 1/50=.02 since it's ounces we want times that by how many OZ in a gallon which is 128. So 128x.02=2.56 (2.5 to make it easy).

OK so he's got 12.5 OZ in 15 gallons and 15 gallons is 1920 OZ. Figuring the percentage of oil in the gas now would be 12.5/1920=.0065 or .65% oil. To convert that to our ratio we go x/1=.0065 and solve for x which is 153.85 so he was running 154-1!

Pardon the ran't I'm bored!

 

[tpenfield]

Re: Goofed up today. No oil in gas. Please comment.

+1 ^^^

17:1 must be 'new math'

as a quick off the top of my head . . . 5 gallons at 50:1, then add 10 gallons gas . . . . I get 150:1

So, would 150:1 ratio for a minute (or so) trash the engine???

 

[Frank Acampora]

Re: Goofed up today. No oil in gas. Please comment.

You guys are going the wrong way on your math! It is 150 to 1.

Now, That said, For a couple of years, OMC engines were run at 100 to 1. In fact, Evinrude did some studies at that time that showed an engine run at 50 to 1 for a while had enough reserve oil in it that it could be run for a couple of hours (If I remember correctly) with NO oil in the gas as long as RPM were kept under 2000. The only reason that omc went back to 50 to 1 was because that at 100 to 1, there was not enough residual oil in the engine to prevent long term storage corrosion.

Now, of course, VRO systems vary oil from about 100 to 1 at idle to 50 to 1 at WOT

ALL this to point out that with your 150 to 1 ratio you will have done no damage at all from the short period of running.

 

[healey8390]

Re: Goofed up today. No oil in gas. Please comment.

You guys are going the wrong way on your math! It is 150 to 1.

Now, That said, For a couple of years, OMC engines were run at 100 to 1. In fact, Evinrude did some studies at that time that showed an engine run at 50 to 1 for a while had enough reserve oil in it that it could be run for a couple of hours (If I remember correctly) with NO oil in the gas as long as RPM were kept under 2000. The only reason that omc went back to 50 to 1 was because that at 100 to 1, there was not enough residual oil in the engine to prevent long term storage corrosion.

Now, of course, VRO systems vary oil from about 100 to 1 at idle to 50 to 1 at WOT

ALL this to point out that with your 150 to 1 ratio you will have done no damage at all from the short period of running.

Good point about residual! When I tore down for the rebuild there was a good amount everywhere, especially the main brarings, rod bearings and pin. I was very surprised when I saw that and didn't think 2 strokes got lubricated that well. My math is the technical way so the "industry" way would be 150-1 for simplification of the #'s.

 

[oxmax360]

Re: Goofed up today. No oil in gas. Please comment.

Great point that Frank made about OMC. That motor is fine.

 

[roscoe]

Re: Goofed up today. No oil in gas. Please comment.

+1 ^^^

17:1 must be 'new math'

as a quick off the top of my head . . . 5 gallons at 50:1, then add 10 gallons gas . . . . I get 150:1

So, would 150:1 ratio for a minute (or so) trash the engine???

corrected.
My brain figured 1 third of the recommended oil, but posted 3x's oil.


150:1 isn't going to kill the motor run at idle, for a short time.


funny how it took you all 4 months to catch that.

 

[catfishcarl99]

Re: Goofed up today. No oil in gas. Please comment.

ya chalk it up to lesons learned. if only ran for a few min ide agree that it prob did no lasting damage. i always add oil as in filling at the pump. slowly trickle it on the flow of gas from nossle. then when i leave the station i do a lil nascar cleaning the tires trick. i turn left to right sharply a few times every few hundred feet for a mile to shake the gas in the tank. be a good reminder to NEVER add gas without adding oil at the same time. just be glad you remembered. like a plug. it doesnt hurt if you remember before you cack it off the trailer. lol.and i just replied to a 4 month old Q.:facepalm: lol thanks roscoe.

 

[catfishcarl99]

Re: Goofed up today. No oil in gas. Please comment.

ya chalk it up to lessons learned. if only ran for a few min ide agree that it prob did no lasting damage. i always add oil as in filling at the pump. slowly trickle it on the flow of gas from nossle. then when i leave the station i do a lil nascar cleaning the tires trick. i turn left to right sharply a few times every few hundred feet for a mile to shake the gas in the tank. be a good reminder to NEVER add gas without adding oil at the same time. just be glad you remembered. like a plug. it doesnt hurt if you remember before you back it off the trailer. lol.

and i just replied to a 4 month old Q.:facepalm: lol thanks roscoe.