RE: Brisbane Model Marine club day 9th - Ozzie Vid's
hmm, I'll be in Brisbane and Chinchilla in a week or so (they haven't told me yet, or for how long)... if there's anything going on when I'm there I might be game to hang out for a bit...
Posted on: 9/14/2012 10:14 PM by Author "rangerfredbob" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=11229003

RE: weight to power ratio / which engine
[quote]ORIGINAL: av8tor1977 I don't recommend the Weedeater/small Poulan engines as they are low on power and cheaply made in my opinion. From there you go up to the Stihls, Echos, etc., but the price goes up and the availablity used goes way down. AV8TOR [/quote] I wouldn't seek them out either, but since they're the only thing Walmart sold for YEARS, there's TONS of them out there, I agree on the quality and such though, the 2 bolt backplate engines are nicer than the 4 bolt ones though, the only gasket on those is for the carb, the rest are formed rubber O ring type seals. Anyway, with oddy's altitude and keeping the current plane flying, putting the engine on a diet or getting a lighter/larger engine would be the best bet, I'm sure there's some weight to loose somewhere, I know my McCulloch 32 has some to loose but most of it's weight is in the crankshaft... Have ideas but the plane flies almost perfectly how it is
Posted on: 9/12/2012 10:40 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11226891

RE: Clunk line for Gas engine
I'm betting the OP figured out his setup about a decade ago, hopefully at least... :)
Posted on: 9/11/2012 11:39 PM by Author "rangerfredbob" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11225799

RE: weight to power ratio / which engine
Stihl, Husqvarna, Tanaka, or Shindaiwa should get you a good running engine to convert in most cases but are just as hard to find cheap as Echo... The Poulan/Craftsman/Weedeater engines (are all made by Poulan) are usually super easy to find because they are the most disposable build but they are also the lightest of the consumer models. At one point I set up one of the old 18cc Poulan 4 bolt backplate engines with prop set up for gas/glow and it was right at 2lb. The downside of these is their out of the box power is quite low, their mufflers are quite restrictive (although some are super simple to gut) and exhaust port timing is VERY VERY tame, I think I measured one at under 120* one time... Open up the muffler and increase the exhaust duration and they might be acceptable, probably not on par with a stock Echo but usable... Was flying with a guy on Sunday that had a Goldberg stick type plane (W8ye had one, don't remember what it was called) with a 2 bolt backplate 25cc Poulan on EI with the stock 2 needle carb and a stock muffler with 3 quarter inch holes drilled in it, sounded like a flying weedeater but once warmed up ran ok, got to messing around (he was told the engine was smaller, so I brought out a known 25cc to attempt to jump it up a little) and decided to gut the muffler at the field and it then sounded like a flying chain saw and according to him was a completely different plane in the air, looked to be fairly respectable power. I left him with the spare engine with the guidance of telling him to get the exhaust duration to 150*, we'll see how it flies after he plays a little :).
Posted on: 9/10/2012 11:29 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11224656

RE: Is a 19x8 to much for a 33cc
I've got a APC 16.5x8 made out of a 18x8 prop that I trimmed down from an extremely minor prop strike... unless I told you it was trimmed you probably wouldn't notice, it behaves decent, hauls the plane similar to the 18x8 that it was made from, have about half a gallon through it so far.
Posted on: 8/30/2012 7:47 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11212175

RE: Header parts for home made??
If you're thinking steel, electrical conduit might be easiest to work with, benders for them are simple and work well
Posted on: 8/12/2012 10:50 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11191203

RE: Decision: New Poulan 25 or Hommie 26
my stock 32cc Mac engine flew a 50cc size Extra 330 once... but that's all it would do was fly around slowly... If you said you were going to put one of them in a .60 size big stick that would be a different story since either would probably handle it fine, the Poulan might be lighter (haven't put a Homie 26 on a scale) but without porting would probably be lower on power, I haven't heard prop numbers on the 26cc homies, I have a few but haven't converted one yet.
Posted on: 8/12/2012 10:47 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11191202

RE: Porting work on a 20cc.
if you take the gasket out after porting to 150* the port timing will change and be lower again... Take the gasket out and check the squish band with some solder to make sure it is .020" or larger (some contact when you take the gasket out) and then do your porting.
Posted on: 8/12/2012 9:02 AM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11190382

RE: Stihl 62cc challenge....
I somehow didn't see it, interesting build definitely, I've just been too busy with life to fly let alone convert engines (my lathe hasn't even been at my house for about 6 months, work needed to borrow it). I'm glad your 3 standoffs set up like that are working good, I have a similar setup on my old Pioneer 52cc with 4 standoff's that I don't have all that much run time on that I've wondered about at times, hoping to get that plane up in the air later this month if things cooperate. I have more fun converting the engines than spending money on one, sometimes you find a diamond in the rough, sure it might take some experimenting to get there but you usually get there. Things need to stop breaking for me, if it was small things it would be one thing, but when your daily driver breaks down and the backup vehicle (at the same time) it puts a damper on anything fun that you want to do.
Posted on: 8/7/2012 12:54 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11184552

RE: Prop mounting holes
[quote]ORIGINAL: STUKA BARRY [quote]ORIGINAL: pilotpete2 +1, I don't know the upper displacement limit for a single bolt prop setup as far as displacement goes, but I do know, I'll never own an engine in the displacement range that would actually require a 4 bolt setup.[:)] Pete [/quote] I dont understand your logic on this statement as a DLE 30cc which is a very small gas engine has a multi bolt hub. [/quote] He means that 99% of all engines with a multi bolt prop hub don't "need" them, I don't remember what TOM or Antique said was the upper limit of a single 3/8" prop bolt but I think it was in the 250cc range, which is well beyond what 99% of us will ever fly...
Posted on: 8/5/2012 10:51 PM by Author "rangerfredbob" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11182474

RE: Stihl Engine
cm3 is cubic centimeters or cc, so I'd say 19.8cc :) Depends on what you want to do with it, boat engines don't "have" to be water cooled, air cooled works great if it's an open top boat... If you converted it to electric ignition or gas/glow it would make a decent candidate for an air prop, once you remove the pull start and related stuff behind it you probably loose about a pound so it would be a respectable weight by then.
Posted on: 7/30/2012 7:50 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11175355

RE: Gas Tank Setup?
Tygon seems to harden when it's been in gas then dried out, I try to leave just a little fuel in my planes and I've had the same piece for 2 years in one of my planes and it still clunks around fine. By just a little bit I mean I have a Sullivan tank and I just leave gas in the little front part as I store the plane on it's nose (any more and it seeps through the Dubro stopper or gets through the vent line) since I store them in a tiny bedroom that's also my office
Posted on: 7/25/2012 6:58 AM by Author "rangerfredbob" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11168451

RE: Homelite 25cc gs/glow mounting plate question
I've put 2-3 gallons of fuel through my McCulloch 32cc mounted with 4 allthread studs out the back on the stock firewall of the Ultra Stick Lite 120 (I think it's 1/4") with fender washers on both sides of the wood and the engine seems to be just as tight now as it did when I put it on. I put the studs in until they bottom out (they're slightly tapered threads so they stop decent) then put one or two 10-24 nuts over the back plate (however many I need to get it to sit flat).
Posted on: 7/21/2012 8:00 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11164022

RE: Craftsman 25cc Conversion
I've had one of the 18cc engines set up for gas/glow at one point before I found out there just wasn't enough compression to run (scored), but with prop, prop adapter and everything needed to run it was right at 2lb. The 18cc engines are a little lighter than the others though, the cylinder on the 18cc is a different casting than the rest of the sizes, I think there are only two different outer castings but I have never looked at the rest of the sizes that close, the crankcase on all of them is fairly similar (there are a few that are slightly different, mostly back plate seal wise) The GTI 15T are reed intake rear exhaust, I've got a few of those too.
Posted on: 7/19/2012 11:18 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11162096

RE: Craftsman 25cc Conversion
yeah, that's the older style stock mufflers that aren't crimped together, baffles removed, stock outlet welded shut then a camp chair tube welded as shown from the inside. I'd offer to look through my stash and make you one but I don't think I have a spare or the springs to go with it, let alone the time to make one up... I've been home 4 days since last sunday (the 8th), I'm now in Saskatoon through saturday...
Posted on: 7/18/2012 9:02 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11160665

RE: AMSOIL SABER 100:1 PRE MIX SYNTHETIC 2-CYCLE OIL AND AMSOIL QUICK SHOT FUEL ADDITIVE
[quote]ORIGINAL: Firepower R/C Instead of another sales pitch, why don't you explain exactly how Amsoil 2 stroke will show me a significant, tangible advantage over other oils? A side by side engine shootout would go along way to convincing your peers. Maybe we could get R/C Model Review to do it! What we want here are hard facts sans the smoke blowing (another pun, whoopee!). [/quote] And with the caps lock OFF!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! If all your posts weren't a blatant sales pitch (with little or no information, just "Amsoil is the best!") and in all caps, I don't think things would be going this bad for you...
Posted on: 7/17/2012 11:14 PM by Author "rangerfredbob" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11159527

RE: Craftsman 25cc Conversion
It's a Poulan, basically the same as all the 18/21/24cc variants just a little bigger. I don't think I have any spare old style two piece mufflers left that aren't slated to engines or I'd offer one of my mufflers. Skip the backplate mount it just adds extra weight, instead get some long 10-24 screws that are threaded all the way or some 10-24 allthread and thread it into the back plate holes, thread on some nuts to hold the back plate on, will probably take two or three to take up the space needed for the curved back plate then put fender washers on both sides of the firewall of the plane and nyloc nuts on the inside of the plane, works great, I used this method on a 40 size stick so you can't say it's impossible... For the prop hub it should be 5/16-24 threads, only the long shaft engines are odd and I think they're just 3/8-24 [IMG]http://i960.photobucket.com/albums/ae84/rangerfredbob/RC%20Stuff/april2010106.jpg[/IMG] There's a pic of some 21cc engines I put together, take note of how far I trimmed the coil mount, that is far as I would go, no further, you can see the mufflers I use as bases, that style is MUCH easier to deal with. You'll also notice I used the stud method for the carburetors too.
Posted on: 7/17/2012 9:21 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11159481

RE: Interference problem HELP please
See if you can find someone installing cable in a house somewhere and just ask for a scrap of the coax cable, I've done that before, I might have just crimped on a ring terminal at one end which should work fine, that stuff doesn't solder very well
Posted on: 7/17/2012 9:06 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11159470

RE: Blackjack 55 how to lock the crank??
use rope not metal, using a piston stop like that is a bad idea unless using it as a reference to find TDC... the center of the piston is the least structural part. Just take some small rope (I use the pull rope pulled from a weedeater, has a nice handle on one end :)) and push it through the spark plug hole, just be sure it doesn't go into an exhaust or transfer port and you'll be just fine.
Posted on: 7/15/2012 11:51 AM by Author "rangerfredbob" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=11156152

RE: Oil
two stroke oil discussions end up like that a lot... end result is to use what works for you, and use enough oil (not too much or little) and in the ratio range that the oil was designed to be used. For most users any oil will work just fine, right now I think I'm running walmart brand since it's what I grabbed at the time... only thing I hear is to avoid caster oils like Klotz, and avoid Lawnboy because it'll leave deposits in the ring land and rest of the piston
Posted on: 7/14/2012 6:05 PM by Author "rangerfredbob" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=11155473

RE: Oil
[url=http://www.rcuniverse.com/forum/m_11150017/tm.htm]HERE[/url] you go I run 32:1 in everything I have, try to run Pennzoil but can't friggin find it anymore locally, or even any 2 stroke oil in quart jugs...
Posted on: 7/14/2012 10:03 AM by Author "rangerfredbob" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=11154952

RE: 42 cc homelite
people usually run a 16x8 to 18x8 on those engines, a 14x6 wouldn't get you as much thrust...
Posted on: 7/14/2012 9:51 AM by Author "rangerfredbob" in the forum "RC Airboats"
http://www.rcuniverse.com/forum/fb.asp?m=11154940

RE: 42 cc homelite
That's a fairly popular engine to convert, if you do a search in the engine conversion forum (if you replace the forum ID # in the address of the airboats page with 92 it'll take you there) you'll find numerous posts. If I remember right the coil on that engine mounts on the saw housing not the cylinder so electric ignition would be easiest.
Posted on: 7/9/2012 10:50 PM by Author "rangerfredbob" in the forum "RC Airboats"
http://www.rcuniverse.com/forum/fb.asp?m=11149592

RE: Primer bulb???
That's basically what I figured Primer bulb kits are available at Home Depot and Lowes for under $10, there's one kit with a walbro bulb, zama bulb and a remote bulb in the same package... The other kit comes with some fuel line, a filter clunk (the ceramic one I think), and a remote primer bulb labeled to fix a Ryobi.
Posted on: 7/2/2012 12:58 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11140163

RE: Primer bulb???
I've been running one on my Mac 32 for a couple years because the G230 (Car engine) carb I used (it was handy and a good match) had one, it is handy as heck! Like you said, flushes the carb, pushes out air for the first start if it's been a while since the last time you had it out. If you run a 3 line fuel system, tee the fill line into the return line from the bulb and even if there is an air leak in that line it doesn't matter at all. If it wasn't physically on the carb I don't know if I would put one on, but I've thought about doing it, and I think if a plane I put together has a carb that's set up for it I might try to incorporate one... Might just be another one of those conversation starters like explaining to someone that your engine used to cut weeds or wood :) One down side on the carb mounted bulbs I've ran into, if there's no fuel in the bulb they don't seem to want to draw fuel if you forget to prime the system, I think it might be from the membrane or whatever is in it's valve assembly.
Posted on: 7/1/2012 11:27 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11139448

RE: weedeater question
that's average with the junk stock carburetor, on a blower that's like 10 years for their target customers. Not to mention that's for their emissions warranty and to weasel into a market cheaper. I'm not saying they are great engines as they are pretty much the bottom of the barrel, but once a decent carb is installed and tuned decent with some care they'll last just fine
Posted on: 6/22/2012 8:11 PM by Author "rangerfredbob" in the forum "RC Airboats"
http://www.rcuniverse.com/forum/fb.asp?m=11128386

RE: Is it worth taking flywheel fins off?
I usually just break the fins off with pliers about 1/8" above the flywheel surface, clean up the fins some to look better but leave some meat for balancing, then balance as needed. An airplane mount for a 26cc homie is a tricky thing, I haven't come up with a good way to mount one yet for airplane use
Posted on: 6/18/2012 7:17 PM by Author "rangerfredbob" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11123121

RE: weedeater question
most weedeaters and blowers come with carbs too small for optimal power (chainsaws are different, they're usually carbed proper), carb size varies on engine size but an 11mm venturi should match up decent if it's a 25cc like most of their blowers. Spring mufflers are sometimes easy to modify on those as they're just held together with the springs, some types of their mufflers are crimped all the way around though.
Posted on: 6/12/2012 7:35 PM by Author "rangerfredbob" in the forum "RC Airboats"
http://www.rcuniverse.com/forum/fb.asp?m=11116332

RE: weedeater question
They are made by Poulan. Not the best engine but if it's the 25cc with bolt on muffler that's the best they make in that style.
Posted on: 6/11/2012 7:07 PM by Author "rangerfredbob" in the forum "RC Airboats"
http://www.rcuniverse.com/forum/fb.asp?m=11115060

RE: help on identifing my engine.
you could use a tight fitting aluminum spacer with a big enough outside diameter to meet the prop, that's about all the hub is for one of those... On the starter, if you have part of a weedeater sitting around, making something like this might be good for ya: [IMG]http://i960.photobucket.com/albums/ae84/rangerfredbob/RC%20Stuff/August2010067.jpg[/IMG] I need to get that boat going again, that 4 stroke engine sounded cool... If you put a little blue loctite on the threads before putting the nut on you should be able to start it with a drill and socket though.
Posted on: 6/6/2012 9:52 PM by Author "rangerfredbob" in the forum "RC Airboats"
http://www.rcuniverse.com/forum/fb.asp?m=11109632