Thanks John that means alot coming from the designer of this boat. Question Im running 30% Heli fuel if I move up to 50%or 65% boat fuel will I need to shim the head
I have not run the 18 size engine you have, so I can't say for sure. My experience with the 20 size engines tells me it will like higher nitro. Remember though, If you run more nitro you need to richen the needle valve. If the glow plug gets mangled but the coil is dull you are too lean. If the glow plug coil is mangled and shinny.......raise the head a bit. If you have a lathe a bigger bowl cut on the head button would be better than raising the head button. An old trick I used to open up the head volume a bit was to cut off the sharp edge where the dome meets the squish band on the head button. Just rounding off that edge with an exacto knife was enough to open up the head volume without needing a lathe, and I didn't need to raise the head clearance. It might have had something to do with letting the fuel/air mixture get into the squishband area quicker rather than reducing volume. It worked though.
Thanks for the tips John. I have no lathe but will mess with it in the spring.
Not much of a machinist. But what tools and how do I do it,that is check the clearance. Also are you saying I can run 65% at .006 clearance?
Preston? You are the wizard on the smaller motors. Are you getting by ok with .006 and 65 % nitro? If so, the head button needs no mods. If the clearance is high like Preston suggests, just put in the high nitro and see what happens. again....you have to richen the mixture.
Thanks John I will give it a try in the spring. Hope Preston chimes in would like to know how to check the clearance and what I will need to do it.
Thanks john I think I may have a dial caliper floating around in the basement somewhere. I will add this to my list of to do"s for the spring
Harbor Freight puts their digital calipers on sale quite frequently. I can't remember what I spent on mine (probably 20 bucks or less)....but after getting one, I don't know what I ever did without it...
Ill keep that in mind if I can't find mine. I think there's one right down the road.
Another nice things (that I should have mentioned earlier) about the digital caliper, is that you can change between inches and metric (milimeters). So you only need one caliper for SAE and metric measurements...don't know what I ever did without it...
I just lubed it before I hit the lake
Anthony are you talking about the strut bushing? I don't know if it needs to be replaced yet.The boat has only been run maybe a dozen times. I will check it though. If it is sloppy whats the easiest way to get it out without destroying the strut?
