Spark Plug keeps changing gap??

[Lunker Larry]

Got a question for Crankbearing.

I was wondering why you said to stay away from Lucas oil?

A couple years back I switched to Lucas for my 2 strokes and couldn't believe the performance difference in my 25 Evinrude. Runs super clean and smooth with no smoke. A big improvement over the Castrol I was using before (and the Evinrude brand and CT before that). I use Lucas in all by 2 stroke engines now. My cheap wipper snipper has never run better.

Regarding Ethanol. It is an engine killer. I put the new marine stabil which was made to address the ethanol issues in every tank of gas for everything. Every motor at my cottage this spring started on the second pull: chainsaw, outboard, wipper snipper and lawn mowers and all ran perfect.

Thanks.
Larry

[crankbearing]

Hi Larry,

Yes, this is why i do not get into oil debates it is always each to there own of course.

I have had many customer (Racing) that have ran Lucas oil, Now! we run at 6000-8000 RPM normally and when I tear them down 90% of the time the internals are burnt blue from heat. excessive carbon on the inside crown of the pistons and the walls of the cylinders look like someone is waving at you. We also run very rich mix of oil to fuel usually in the 12-16:1 range and some oils do not like this.

The other thing with Lucas that we have found is at a race we test our fuels for Specific Gravity and oxygenation and anyone in the past two years running Lucas oil is always DQ'd at inspection, The meter we use is a certified digatron fuel meter and it needs to read below zero so in the negative to be legal, every lucas user tested +100 to the positive which means to us that there is some additive in the oil driving up the octane that could be why you are having good luck with it.

I do not debate oils, I use what I use and if you are happy with what you use than stay with it. I just know that the race motors I rebuild that use klotz at my mix rec's need only rings and a quick deglazing and any of the oils I mentioned not to use require bearing, pistons, bore and hone etc...

regards,

Dave

[Lunker Larry]

Thanks for the reply Crankbearing.
With the changes in technology and the volume of products on the market, it gets harder and harder to chose and hope it benefits your motor.
Most of us base our use on the immediate results and don't have the benefit of seeing what is actually going on in the motor. I'm assuming that with the lower horsepower and limited, low speed use that the motor gets at the cottage, I can continue with Lucas and should not have any problems or experience those that you have from the extremes of racing. But, I may consider a change.
Again, many thanks and I've learned a little more.

regards,
Larry