One thing I think also hasn't been considered is spark plug. In testing my converted 22cc Poulan, I tried a different plug and gained 400 RPM. This result may be unique to my engine but I think you can't rule anything out.
man thats seriously interesting. I think were gona look at that plug thing a little closer and see if you had a bad plug or if the other brand is just that much better. should be interesting.
yea so? ok seen the web site many times. has no test data and no proof of power increases from modified to unmodified. I just dont see how there is anything to be had with any of these mods as the testing of myself and others has proven. when the reed is made to have a less restriction to opening in effect increasing flow there is no net effect. so what possible good is making the port bigger gona do? the stock port is still larger than the venturi size so the venturi is still the limiting factor in total effective flow. in other words dosent matter how big your port is your still not gona stuff any more air past your venturi.
More on reed & intake. Also ways to mount a Ryobi. Capt,n
the one pic showing the tapering of the intake runner and inceaseing the size of the port dosent even llook like a ryobi engine manifold. So what engine waqs it off of? did it make a difference on the ryobis engines. doutfull as any mod we have tried had net 0 gain. again what are the testing numbers.
Sorry im not trying to beat you up or be an a hole. i just hate seeing others here being mislead and waisting there time on bullcrap mods that have no net gain and no proof or testing numbers to back it up. Im sorry but it seemed to help just dosent cut it if im gona spend my time and money and build one of these mods.
The Frank Boman piston ring, a good strait cylinder, exhaust at about 150 degrees with the right oil (like Pennzoil for Air cooled engines ) at a 32-1 ratio should give tou a good running engine. Also right prop for the airplane you are going to fly. Just because you get higher RPM,s from a certain prop.. it does not mean it is the best one for the airplane you fly. I do wonder how many different tests you made using the same ring??? Also it takes more time for a used ring to seat back in to give best performance. Thanks Capt,n
Again and I cannot stress this enough. A frank bowman ring does not garuntee a good seal. there are many more variables involved. I achieved very acceptable results with a used ring piston and cylinder. I know exactlly how my setup was sealing as i had the testor and numbers to back it up. again you will have to go back and read the posts to see this process. I am not saying a bowman ring wont make an improvement. all i am saying is without a before and after test comparison you will never know for sure and again it seemed to help just dosent cut it. I do plan on looking at the bowman ring. In fact i plan on looking at using just on bowman ring on a two grove piston.
The 150 degree timming mod dosent garuntee anything either. some engines respond others dont and the numbers are on here to prove that. I have my suspicions as to why some respond and others dont but i havent had time to try it yet. i need to get my machine shop set up before i can continue.
Why would it matter how many test was made on the same ring? I can see this on an engine where the ring is not pinned like on a 4 stroke. on these engines the ring is pinned on and will go back in the exaxt same position where it came off. again if a leakdown test is performed you will know exactlly how your seal is anyhow.