Dynamite .19 for small rtr and jae12 update.

[Davidkrienke]

I finally was able to get around to degree wheeling this little engine. And with two 3 thou spacers made from coke can aluminum I was able to come up with these numbers.
intake rotor open 212
intake rotor close 61
transfers 128
exhaust 184
blowdown 28
squish 7 thou
I have ran 3 tanks on the bench and I switched to the supertigre .18 carburetor because it was 7mm and was larger than stock carb. It seems to run real good.
Also trying the ops pipe with a 1/4 stinger to the high point inside running it at 71/4 inches to start on length. I will have to try a few pipes on the water I have about 5 to try so far but it looks to be a good engine . The numbers are pretty good for no grinding just raising the sleeve so I am pretty happy about that. I will also have to try to machine the head down to around 4 thou once it breaks in . Let me know your thoughts on the numbers. and any changes you think would make it better still.
Thanks Dave

 

[Wasted wages]

What % nitro are you going to run ?

 

[Davidkrienke]

What % nitro are you going to run ?

For the moment I will be stuck with 30 percent. its the best bang for the buck around here at 40 a gal.

 

[Wasted wages]

Was going to suggest raising the exhaust port timing, but only if you were running a higher nitro content...

Interested in hearing how this little setup runs,,
been thinking about finding a little.12 rigger to play with...

 

[Davidkrienke]

Was going to suggest raising the exhaust port timing, but only if you were running a higher nitro content...

Interested in hearing how this little setup runs,,
been thinking about finding a little.12 rigger to play with...

I do like to have them at the 30 degree blowdown but I will try it like this first. hate to go grinding before I see what kind of props it can pull. I know on bigger 2 strokes when I go over 187 or so they get pretty peaky and drink a lot of fuel . I love playing with this little rigger it turns so fast and is a blast. I still want to do the wire drive to it too but that will have to come later. spring is here and I have a northwind 40 and a seaducer 42 gas boat and a provee gas still to finish.