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Old 01-27-2007, 07:17 PM   #1
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Ryobi 31cc ignition

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Has anyone converted one of these to electronic ignition? I'm looking at CH's system. Was wondering if there is an improvement in performance and how much more thier synchro spark helps. Thier price seems resonable and the wieght savings and easier starting makes me leaning towards converting.....Thanks...Dave
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Old 01-28-2007, 08:06 AM   #2
Kevin McGrath
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I have converted a few Ryobis including one to the CH ignition.
The main reason to convert to electronic ignition is the weight advantage gained by shedding the flywheel.It wont develop any more power and the standard conversion doesnt use the variable timing so starting isnt improved and you will still likely have to use a regular starter to spin it fast enough.
Id say its OK to mess with conversions like this but lets face it this isnt a Cadillac design and the big advantage is they are cheap,sometimes free.
If you already have the engine,shave the flywheel,grind off excess metal where you can ,and maybe even get one of Mr Bissons mufflers to quieten it and save weight then put it into a big cub or a SIG 4-120 and enjoy it.
Rather than spend any more money on it investigate the new Zenoah small gassers or the real jewels sold by RC Showcase,if small gassers are your interest.
If you decide to go ahead I can dig out some cyber articles on doing the conversion and fitting the result in a 4/120 and similar models.
My bud Cec who cruises this site ran a shaved flywheel Ryobi in a 4/120 and flew it in IMAC basic and finished far from last in class,but then Cec has a feel for tuning engines and can usually get the worst pig running as well as its ever going to.
Lets face it.......with exchange,freight,taxes ,and hands out along the way the CH unit is going to cost >$150 and you will still have a basic lump with a con rod made of layered steel and rivets,a piston/ring combination that leaks compression like a sieve,and mettalurgy refined in somebody,s back lot in a country somewhere that loves pollution.
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Old 02-14-2007, 09:50 AM   #3
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ryobi conversion

I did one a few years back and it was fun. The engine came from a Costco weedeater which I tore apart using instructions from the net. I used a CH ignition system and was quite proud of how it ran up...until I ran a real gas engine (ZDZ40)
HOLY COW (or some such comment came from my mouth) as I stood back in awe at the raw power coming from an engine that was about the same size and lighter!
Your money is much better spent on buying a ZDZ, DA or other purposebuilt engine, unless you want to fly what Kevin said.
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Old 02-14-2007, 03:22 PM   #4
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I have converted a few engines and for me the price is right. I don't knock any of them as it is what you either do with it(reworking) or buy it all ready done. Another factor that plays in this is do you have the tools to do the modifications. Do a search on the web and you will find lots of mods that guys have done. One I recall was changing the intake to rotary disc rear induction which also lets you stuff the case. To them and me it is another part of the hobby.
The engine of preferance for me is the Homelite. The rod is 1/4" alum and is built a little better. Other good engines are chainsaw types which give you a full crankshaft with front and rear bearings.
I have just about completed a 30cc Homelite for using as a test bed for another project and it looks a little different. Still am going to do more mods after it is running again for checking numbers. One is shaving the case to up the compression and then doing some port work.
It part of the hobby I enjoy along with some electronic's which keeps me ocuppied and busy.
John Davidson
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Old 02-14-2007, 10:11 PM   #5
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A couple of pictures of my Homelite 30cc ready to fire up. I use the plastic club on the front for testing and not for flying. Will weigh it after but forgot to do it before I started but do know that it is lite compared to stock.
John Davidson
Keep the shiny side up and the wheels down

Last edited by Vulcan1; 10-19-2008 at 12:02 PM.
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