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Question about Porting
Hello Everyone. Ive managed to get my self a Toro 25.4 cc engine, My questions are: 1.- Ive read that porting this engines would help improving power to weight ratio, is the improvement achieved significant, on a 25cc engine how much RPM would they normaly increase? 2.- If I understand correctly what has to be done is to make deeper and wider the intake ports of the engines, but how far should I go? 3.- Another thing to be done is to widen the exhaust port sanding only on the down and on the sides (not on the top of it), Im I right? 4.- Should intake transfer porting be done with the Moto Tool with a grinding stone, or how do you do it? Sorry for so much question but I have never port any engine and from what I´ve listen at my flying field if you go to far porting you will end up with and unusable engine. I fly at a very high altitude in México city so engines are quite impacted on their power output so these would be a great fix for my engines. In advances thank you very much Best Regards VÃctor.
Posted on: 9/14/2012 6:15 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11228197
Accesory for aluminum grinding
Hello Everyone, Could someone please share wich accesorie you use in your Rotary tool to grind aluminum when converting your engines. In advance thank you very much Any pic or link would be very much appreciated Regards VÃctor.
Posted on: 9/13/2012 8:47 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11227259
RE: weight to power ratio / which engine
Thanks a lot. I have a converted Mitsubishi 33cc with a larger walbro carb and gutted stock muffler turning a 18x6 arround 6,500 RPM´s but its arround 4 lbs so my weight-power ration is not really good. Is 4 lb a normal weight for a 33cc converted engine in your experience? Regards VÃctor.
Posted on: 9/11/2012 7:02 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11224930
weight to power ratio / which engine
Hello Everyone. I understand Echo are the best weight power ratio engines to be converted, any how in México city where I live, the cost of an Echo trimmer is the same as a brand new DLE Engine. Are there any other acceptable weight power wise convenient and commercialy available trimmer brand. Regards. VÃctor.
Posted on: 9/10/2012 6:36 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11223580
RE: Is a 19x8 to much for a 33cc
Well, I guess i´m gonna have to find something to do with this prop. Is it a proper way to scale down a 19 prop to 18 or 17 inches (Of course balancing the propeller again) or those this process woud really affects the pitch or performance in the prop. Regards. VÃctor.
Posted on: 8/30/2012 1:46 PM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11211852
RE: Need more power which 42 -46cc to convert
Thanks everyone very much You prevent me from taking a wronk decition VÃctor.
Posted on: 8/30/2012 11:44 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11211705
Is a 19x8 to much for a 33cc
Hello everyone. I have been flying an stick kind of plane with a converted Mitsubishi 33cc With a 16x6 propeller I was getting 8,000 RPM but not much climbing power With a 17x6 It gets better I tried this last weekend a 18x6 and while RPM´s goes down to 6,400 the plane behaves much better in the air with much more climbing power. The question is should I try a 19x8 MAS Scimitar prop or would that be too much for a 33cc converted engine? Thanks everyone for your help. VÃctor.
Posted on: 8/30/2012 11:21 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11211689
Need more power which 42 -46cc to convert
them on will be greatly appreciated. Regards. VÃctor (Oddy)
Posted on: 8/15/2012 7:16 PM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11195169
RE: Homelite 25cc gs/glow mounting plate question
Hello, Where did you get the 10/32 studs? Thanks.
Posted on: 8/13/2012 1:50 PM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11191980
How to mount homelite 26cc mightylite
to mount it to the firewall. In advance thank you very much for your help VÃctor (Oddy)
Posted on: 8/13/2012 12:46 PM by Author "oddy"
in the forum "RC Airboats"
http://www.rcuniverse.com/forum/fb.asp?m=11191894
RE: Decision: New Poulan 25 or Hommie 26
Thanks both, What happens is that I live in México City, and Echo weedeaters are the price of a new DLE 30 engine (arround 300 usd) I would really like to convert the homelite 26cc because in México we fly at a very high altitude 2240 metres (7350 ft) and we loose arround a 30% of engine power, anyhow it seems hard to make a mount for this new homelite designs with the angled backplate. Other than homelite and Poulan which other besides ECHO makes a good engine for converting? I convert a Mitsubishi 33cc and Im happy with it and it also has ears to mount directly without backplate to the firewall which is great, Ive been modifying it and getting every time better performance out of it, but for a 60 size acrobatic plane a 33cc would be too much and Im looking for a 25cc. As well I have been looking for a homelite with the flat backplate with 4 bolts but it seems they are not anymore for sell. Thanks everyone.
Posted on: 8/13/2012 12:36 PM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11191881
Decision: New Poulan 25 or Hommie 26
Hello Everyone. I have talk my parents to let me take away one of theirs weedwackers from their garage. They have a Featherlite FL20 with a POULAN 25cc the new design one with the black 2 bolts back plate and a Homelite Mighty Lite with a 26cc (the one with angled backplate) Please help me with which would you consider a better candidate for converting, I understand homelite is heavier but more powerful but the angled backplate is really something I havent figured out how to solve to mount on a firewall. The POULAN 25 cc while being lighter and easier to add a backplate, Ive heard they dont deliver comparable power output Please give me a hand, I would like to use this engines on Extra and Edge 60 size kind of planes. In advance thank you very much.
Posted on: 8/12/2012 7:00 PM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11190956
26cc Mightylite Homelite - Motormount?
Hello Everyone. Im just about to give up but I want to try one more time I have a 26cc Mightylite Homelite trimmer with the engine with the angled backplate. Is it a total loss for converting and mounting on a RC plane firewall or have someone found a way to do it? Thanks Oddy
Posted on: 8/8/2012 11:48 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11185773
RE: Interference problem HELP please
Could anyone post some pics of how to shield the spark plug lead. I have read of it but i dont quite get how to do it. Thanks a lot VÃctor.
Posted on: 7/17/2012 10:51 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11158749
RE: Interference problem HELP please
Thanks a lot. Actually Yes the Steel Rod when Throtle is down goes near the receiver, Ill be changing my Rod for a Sullivan plastic one and making some hatches to move receiver and Batteries further back on the plane. Thank you very much
Posted on: 7/16/2012 9:50 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11157339
Interference problem HELP please
Hello everyone. I´ve been flying with my converted Mitsubishi 33cc for a while experiencing some intereference with the Rx every flight at the same moments. Take off and landings I´m flying with an FM 72 MHz Futaba 8 channel Receiver I noticed that every time when I take off, there was a glitch which takes the throtle down and move the ailerons but it was quick and the plane goes on flying OK. As well every time I came on the final approach and take throtle down the plane glitch specially with the ailerons (doesn´t happen if i do a low pass at full throtle) I have my Rx and Battteries some 14 inches distance from the magneto Throtle is instaled with a steel pushrod inside a rigid plastic tube with a plastic ball link to the carb and an EZ connector to the servo Please give me a hand on what can I do.....I crashed my plane this last weekend managing only to get the landing ripped off and some minor damages. Thanks everyone. VÃctor
Posted on: 7/16/2012 8:33 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11157235
RE: My Engine Conversion Plane (Mitsubishi 33cc)
Thanks both very much for your comments. Actually I do have the 2 tubes out of the muffler and and extra hole in it to free the exhaust.,,I already bought a 13.5 mm Walbro Carb but Im still trying to figure out how to mount the throttle. I forgot to mention that I fly in México city at an altitude of 2,240 metres (7,350 ft) Considering this altitude numbers, do you think I would need to use a smaller prop to get the optimal power out of this engine? It flies well with the 17x6 and the 16x8 but no doubt it could greatly benefit from a better vertical performace In my experience with glow engines, here in México City we cannot use similar prop sizes like the ones used by the guys living closer to the sea level, we do really experience a shortage in power given the altitude which we try to complensate with smaller props to gain some RPM´s. Once again thanks a lot and please any advice will be very much appreciated.
Posted on: 7/11/2012 7:19 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11151257
My Engine Conversion Plane (Mitsubishi 33cc)
Hello Everyone, Just to share some pics of my Weed Trimmer engine conversion plane. Its kind of a self designed Long John with the wings of an U-CAN-DO 3d 60. The engine is a converted Mitsubishi TL 33cc with nothing more than baffles taken out of the muffler, its original 10.5 mm Mikuni carb and a prop hub. I have fly it with different props with the following results - Master Airscrew 16x8 wood @ 7,400 RPM - APC 17x6 @ 8,000 RPM Even though it seems to have a better performance with a 17 inch prop it flies better with the 16 one, maybe I´ll try a 15x10....any comments will be apperciated.
Posted on: 7/10/2012 11:27 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11150161
RE: Is it worth taking flywheel fins off?
Thanks rangerfredbob and bogbeagle for your help. Actually Ive been looking for some way on the web, and it is quit tricky to get a proper mount for this kind of engine, why someone would have designed it this way? Here are the ways I have found until now.
Posted on: 6/19/2012 5:43 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11123531
RE: Anyone figure out how to mount a Homelite 26cc?
So no one has figured out how to mount this engine to the firewall other than the spacers. Regards. VA
Posted on: 6/18/2012 2:32 PM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11122530
Is it worth taking flywheel fins off?
Hello everyone. Yesterday I got my hands on my father in law HOMELINTE Mighty Lite 26 cc weed trimmer. These will be my second conversion project (I´m so happy with my first one which was a Mitsubishi 33 cc) So to begin I have two questions: [b]+ I´m staying with magneto ignition, so could anyone tell me if its worth RPM wise to take off the fins from the flywheel? + My first Mitsubishi 33cc have some ears that allows to be mounted to the firewall with no backplate needed, how these Homelites need to be mounted?[/b] In advance thank you very much Victor Arreola
Posted on: 6/18/2012 6:50 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11122237
Is a Poulan 25cc a weaker engine?
Hello, I have been reading some posts which implies that Poulan engines are not good candidates for conversion as they are highly restricted engines and would require heavy modifications. I have a Weed Eater Featherlite FL20 with a Poulan 25cc engine (the one with the backplate hold with 2 screws only) Is it worth converting it or should I better look for something else, I have converted some engines but never ported or any heavy modifications on them. Thanks everyone. VÃctor.
Posted on: 4/23/2012 7:23 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11053355
RE: Ryobi 30cc is equivalent to old 31cc?
Thanks all for your comments....these make me very happy to know I have a good engine for converting Victor.
Posted on: 4/23/2012 7:19 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11053350
Ryobi 30cc is equivalent to old 31cc?
Hello all Ordering on line a Ryobi 31cc i received the new 30cc version with side exhaust and carb. How does this engine compares to the 31cc version with rear exhaust and carb Please any experience would help to decide if i return this and keep looking for a 31cc or if its worth to convert this new version. Best Regards Victor (Oddy)
Posted on: 4/21/2012 6:45 PM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11051583
RE: long coupling hex nut as prop adaptor??
This is what I´m talking about
Posted on: 3/19/2012 5:48 PM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11007559
long coupling hex nut as prop adaptor??
Hello everyone. Im converting a Mitsubishi 33cc short shaft for using it on a 72 WS ugly stick Im living in México city and its have been hard getting an 8mm prop adaptor (hub) In home depot i found this long coupling nuts which might work, but in México there are only standard chord (not milimetric) Im flying to Louisville kentucky this week, any idea where can i find this long hex nut or any other suggestion of something that might work as prop hub. Regards VA
Posted on: 3/19/2012 4:23 PM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11007445
RE: 20mm Walbro for MITSUBISHI 33cc?
Hello, av8tor1977, and thank you. I have just measured again and it is a 20mm Walbro carb....It has the numbers 34-51 in the choke I leave in Mexico city at an altitude of 2240 metres (7350 ft) so maybe the extra airflow would compensate for the loss of power given the altitude Would the engine work properly with such a big carb??? Thanks everyone. VÃctor
Posted on: 3/18/2012 2:51 PM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11005795
20mm Walbro for MITSUBISHI 33cc?
Hello everyone. I´m converting a mitsubishi 33cc weedwacker engine. It has a 10mm carb on it. Yesterday I got a Walbro 20mm carb....do you think this might work and help performance of this engine or is it too much. Any advice will be highly appreciated. Regards ..Victor.
Posted on: 3/15/2012 8:57 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11001056
20mm Walbro for MITSUBISHI 33cc?
Hello everyone. I´m converting a mitsubishi 33cc weedwacker engine. It has a 10mm carb on it. Yesterday I got a Walbro 20mm carb....do you think this might work and help performance of this engine or is it too much. Any advice will be highly appreciated. Regards ..Victor.
Posted on: 3/15/2012 8:55 AM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=11001052
RE: Mitsubishi 33cc Conversion
Thank you very much av8tor1977 I´ll try the machinist here in México. Any idea on which would be the most recomended string trimmer brands to take the engine out and get it converted for RC I understand Ryobi is one of them, anyhow its 31cc version is already discontinued, any other brand small low weight and powerfull vs Others. Thank you very much. VÃctor.
Posted on: 3/8/2012 2:02 PM by Author "oddy"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=10991851
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