Fouling plugs? Update 9/2/08

[spareparts]

i used to use 100-1 amsoil synthetic blend in an old cross flow. Amsoil designed it to replace a 50-1. It worked real good, the engine idled good, but it didn't smoke enough for me, I always wondered if I had mixed the oil with the gas, or had mixed it correctly. Engine never had any issues from running it.

[bassarama]

I’m starting a 50:1 mix ratio until I use all my Quicksilver oil, after that I’ll look into the semi or full synthetic oils. For safety purposes, I do quite a bit of idling when fishing at or near some rips (Race and the Gut) If I could cut back on some of the white smoke it would be great…

Thanks

Joe

[THEFERMANATOR]

PENNZOIL vs QUIKSILVER will definately cut down on your smoking some. QUIKSILVER is a good oil, but it smoked ALOT in every engine I've run it in.

[bassarama]

Thanks
I added gas to the tank so I stayed closer to the 50:1 mixing ratio, last Sat. I went fishing with my neighbor and his son, we burned about 20 gls of fuel drift fishing and moving around, overall, I noticed a little less smoke and no fouling occurred.

One thing I notice was the lack of top speed, the max I could do was 33 mph.(usually 42 mph) Can’t figure out why…

Prior to the trip, I installed a brand new set of Champions set at .030 gap. Did I buy bad plugs?


Thanks

Joe

[THEFERMANATOR]

You may have been running lean before at WOT. 40:1 will actually lean your fuel mixture out vs 50:1. At 40:1 your fuel is denser and slightly thicker which makes it go through the jets slower. 50:1 will fatten your top end out slightly.

[bassarama]

Originally Posted by THEFERMANATOR

You may have been running lean before at WOT. 40:1 will actually lean your fuel mixture out vs 50:1. At 40:1 your fuel is denser and slightly thicker which makes it go through the jets slower. 50:1 will fatten your top end out slightly.

If I understand your theory, I’m supposed to gain a little top end speed at 50:1 because the fuel viscosity is lighter than 40:1, right?

This boat top speed has always been around 42 mph @ + - 5000 rpm’s. Saturday there were two adults and a kid plus all the fishing gear, the max rpm’s I could get was 4500.

Thanks for your expertise

Joe

[THEFERMANATOR]

No, the other way around. 40:1 is thicker so it takes more to pull it through the jets, so in turn less goes through. Also as there is more oil in the blend than fuel, every drop that goes through has less fuel in it at 40:1 than 50:1. 40:1 vs 50:1 doesn't sound like much of a difference, but when working with loopers it can be a big difference. I would still stick with the 50:1 mix and check your plugs to make sure you don't have one fouling out or something. Maybe try running your gap at .035.