Fouling plugs? Update 9/2/08

[THEFERMANATOR]

That 150 looper you have WILL foul plugs on 40:1 at low RPM's, not much you can do about it. The VRO ran them at 100:1-150:1 at idle to prevent plug fouling, but they would go to 50:1 at around 2000 RPM's and then to 40:1 above around 5000 RPM's. I would use a semi synthetic like PENNZOIL offers and mix it at 50:1. A regular dino oil at 50:1 will still foul plugs more frequently than a synthetic blend or a pure synthetic.

[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