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sandos

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Reply with quote  #1 
My cousins optimax recently stopped supplying oil to the engine and the result was no boat for the summer and a new powerhead required.
He now swears black & blue that all oil injected engines are no good & he'd rather go back to the days of premix because at least that way you know your engine is getting lubricated.
Infact, he told me that the engine machine shop had 13 optimax & E-tec engines waiting to be rebuilt; all due to failure of their oil injection system!
Is the true rate of engine failures on HPDI 2-strokes being swept under the carpet?
Are the oil injection systems the archilles heel of the system? 
Are they that unreliable? 
5 year 300 hour warranty is all good & well, but i tend to keep my motors for 20 to 30 years!
Unbiased thoughts?
waterboy_75

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Reply with quote  #2 
No way to be 100% accurate but I think the oil injection seems to get blamed when no other problem is obvious enough for a tech to blame. I know the few newer DI style engine failures I have seen had single cyl failures so for me it is hard to blame on the oil injection. I would tend to believe injection failures would tend to be multiple cyl failures but??
olypopper

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Reply with quote  #3 
Your cousins opti-pop probably died from the far more common melted cylinder from lean running versus oil system failure.  I've yet to see an oil system failure on an Opti that wasn't related to plugged filters or poor oil transfer caused by air leaks.  The E-tec system is far more intelligent in the way that it monitors oil pressure compared to other brands.  There have been powerhead failures but extremely few due to oiling concerns.......................More often than not, novice (keyboard experts) will proclaim oiling system failure when a piston siezes from a lean running condition. 

Your cousin can go back to premixing all he wants, I'll keep my oil injection.

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sandos

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Reply with quote  #4 
My cousins opti died from oil starvation, 100%. It all started when the sender stopped reading the oil level, a new sender was installed, still no good. So a whole new oil bottle and sender were installed. Engine seized after about 400 meters of on the plane running. The tube at the bottom of the oil bottle had air in it. Looks like an air lock did it. No alarms at all went off . The authorised dealer that did it completely washed his hands of responsibility. Somehow, cuz managed to get it fixed through insurance! .

As for him going back to premixing, how can that even work in a HDPI 2-stroke? as far as  I can tell it won't. No way in hell would it work. (also see my post on "racing e-tecs")
Megalodon

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Reply with quote  #5 
If he wants to premix his opti it'll last less than 400m! Older outboards (carb and 'traditional' injection) draw the fuel through the crankcase into the cylinders, lubricating the rotating assembly as it goes. I'm guessing the ski race guys you're talking about are merely using E-TEC or 3 litre opti blocks, and running aftermarket 'traditional' injection systems that draw the fue/air/oil through the case, they're not directly injected at all.
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Huey

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Reply with quote  #6 
Hi, did you cousins OPTI have damage on all cylinders so just a few and if a place has 13 odd engines in for rebuild and they are saying they are all due to a no oil situation then they really donot understand the modern DFI outboard-simplae as that. As Don said I too have not seen an E-TEC fail due to a lack of lubrication and the warning and protection systems on E-TEC and OPTI are very good and do not give alot of problems.

This site is for Evinrudes and no I would not pre-mix an E-TEC so if you are worried find yourself a dirty engine and then pre-mix.

Cheers,

Huey.
Evinrude

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Reply with quote  #7 
Fuel system problems take out a lot more powerheads then oil system problems.
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omarf4

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Reply with quote  #8 
My brothers son's cousin swears that his father had had no issues with his e-tec...
Unbiased opinion, go buy a premix Johnson and save this board for actual owners.....

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sandos

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Reply with quote  #9 
omarf4, an E-tec is on my shopping list, so don't be so rude!
sandos

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Reply with quote  #10 
And guess what !? had a similar situation with my E-tec, after having the powerhead replaced under warranty got about 500 meters from the marina and had the alarms sounding for an oil problem. (Was quite a while ago now, can't remember exactly what it was saying.) 
Back to the dealer again... He re bled the oil lines , couldn't get the problem to occur for him - said it was probably a small air bubble triggering the alarm.
Seems to be all good now, although i am wondering if it's using more oil than it should be. I'll have search the forum for more on that topic.
Huey

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Reply with quote  #11 
If you can not remember not much we can add and best to start another topic with a history report showing what code. If the dealer did not do the correct procedure when bleeding the oil system a code will happen to protect the engine from running wihout oil to all cylinders and front fitting that lube the c/shaft etc.
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