To inject or not to inject, that is the question

I picked up a 1985 150 Mercury XR2 from Rees Guide who was using it with the oil injection system disconnected. I had the oil lines, pump, and reservoir redone on my motor last year. I torched #2 cylinder somehow (age and ethanol in fuel I am told are probably the culprits) and now want to know if I should put my oil injector stuff on the motor from Rees. He had stated that it idled a little rough and I am thinking the oil injection may eliminate that problem. Then again, I don't really trust those injection units and my previous boats both had the oil injection disconnected by me because I figure, if you mix your oil and the engine is running, you know it is getting oil. Thoughts anyone?:help

If its off I sure would not waste the time and money to reinstall it. Check the plugs for the ruff idle and also run a can of sea foam thru it.

There is nothing wrong mixing your oil instead of using the injection unit. Same thing.

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Originally Posted by Tracker123

There is nothing wrong mixing your oil instead of using the injection unit. Same thing.

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Not exactly. Often when you disconnect a VRO the motor won't idle quite as good as it did before. This is because a motor with a VRO is engineered to mix the oil with gas at 100:1 at idle. As you increase RPMs the mixture gradually changes until it reaches 50:1 at higher RPMs.

Interesting, didn't know that about the VRO, thanks. Just curious, why would it need the excessive oil at idle?

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Originally Posted by Tracker123

Interesting, didn't know that about the VRO, thanks. Just curious, why would it need the excessive oil at idle?

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That is less oil. 100 parts gas to 1 part oil

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Originally Posted by Barnacle Bill

That is less oil. 100 parts gas to 1 part oil

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Yep.....thats right half as much oil as 50 to 1

Yep, I knew that, don't know why I typed it. So let me rephrase it, why less oil at idle?

Less oil at idle is due to less actual fire in the cylinder at idle so less oil means cleaner burn resulting in smother idle.