50cc vs. zenoa 62cc??

[TheTank]

Stock specs on a G62: RPM figures listed with an APC 22x10 prop.... thats almost in the same class as a Zinger Paint stirrer. If someone has see them pull those numbers in stock form with a Mejzlik or a Menz 22x10 please let me know, because mine sure didnt put out that kind of performance.
G62 Engine (3.8 cu in)


Key Features

• CDI Ignition system
• One-piece chromed cylinder
• Ball bearing-supported crankshaft
• Turns props ranging from 20 x 14 up to 24 x 10 at roughly 7600 rpm
• Capable of powering an airplane as big as 40 pounds with authority

Overview

The only engine allowed for competition in the Giant Scale AT-6 racing class, the G-62 is the benchmark by which all other engines in its class are measured. This engine is ideal for giant Warbirds, such as 100" AT-6 Texans, as well as the ISC 1-800-COLLECT Pitts Challenger II, and popular sport big birds like the Lanier Stinger and Laser 200. The G-62 will turn a 22 x 10 prop at approximately 7200 rpm.


Specs

• Type:2-Stroke
• Displacement:3.80 cu in (62.0 cc)
• Bore:1.90 in (47.5 mm)
• Stroke:1.40 in (35.0 mm)
• Cylinders:Single - Chrome Plated
• Total Weight:82 oz
• Engine (Only) Weight:73 oz.
• Muffler Weight:9 oz.
• Crankshaft Threads:M10 x 1.25
• Benchmark Prop:22 x 10 APC @ 7,800
• Prop Range:20x8 - 22x10
• RPM Range:2,000 - 8,500
• Fuel:Gas/Oil mix
• Mounting Dimensions:163 x 222 x 197 mm
• Muffler Type:Can
• Cylinder Type:Ring
• Carb Type:Walbro HDA-48 D
• Crank Type:Ball Bearing

[Brave]

	Quote: Originally Posted by Zeeb
	I have to chuckle everytime I see one of these posts about bigger engines and the "Warbird" guys say "it'll pull the plane apart", "it won't fly scale"... I think some of these guys don't know how to use the throttle in any manor but on/off. I'd definitely opt for bigger over smaller and all you need in most cases is a bit of restraint with the throttle, but it is there if you need it. The other thing and it is often overlooked, is that most Warbirds wind up being tailheavy and require some added weight on the nose. That being said, it's one of the reasons you see so many G-62's in 'em. It's also a really tough, reliable engine but it does have the side mounted carb and I wouldn't own a gasser that did not have electronic ignition. There are those who run the magnetos and are perfectly happy with them but it's not my cup of tea. So basically, if you can come up with a modified G-62 that'll fit in the cowl (carb mod) and an electronic ignition for a decent price, then I'd say go for it. Barring that, the rear carb 50/60cc size made for use in a model airplane engines, would be my choice. My brother is putting a ZDZ in his TF 1/5 scale Mustang with one of Kelvin's exhaust systems and it's gonna be sweet....

Thanks, this is a wealth of very valuable info. that I can use. I bought the g-62 and will in time do the conversion. I myself choose to be better safe than sorry. Thanks again......
Eric Eggemeyer

[Brave]

Next question, I'm still trying to make heads and tails of all the great posts, what modifications do you recommend to max. performance, and who do you recommend?

	Quote: Originally Posted by Brave
	Thanks, this is a wealth of very valuable info. that I can use. I bought the g-62 and will in time do the conversion. I myself choose to be better safe than sorry. Thanks again...... Eric Eggemeyer

[airbusmech]

I converted my G-62 to ignition by simply removing the hub and CDI. I then had a new hub made and installed a falcon ignition unit I had purchased used. I now have a motor that is super easy to start and advances to almost 20 dgrees BTDC at full throttle.This little motor has turned into a stump puller in my eyes. Never one dead stick and super reliable.

I also have the giant scale mustang and met someone down south last year who was flying his at Bay city with the 52 in it.The G62 would work with a lot of sweat trying to fit it in but the revolution 52 would be the most ideal setup for that airplane. When mine is built the revolution 52 is going into it.

[rcign]

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[rcign]

I have been converting G62s for 21 years.....
"Modiifed" in my book means taking the magneto off and replacing it with electronic ignition, nothing more, no porting, compression, etc....
If you want to "pop it out of the box" to compare it to a DA or other 50 to make it a fair comparison,
take the mufflers off both and have EI on the G62...G62s for 21 years have been characterized as heavy becaouse all the other engines are EI....If you "pop" one of mine out of a box it will weigh 4 lbs because it will have EI..
FWIW, in all those 21 years I have not seen 7800 rpm on ANY 22-10 inch prop....Mag or EI....
If you just gotta have a stronger G62, put a pipe on it...see the rpm thread at the top of the page...
If you want more power for about $600 get a 3W 80xi...They were on sale a while back for that...No comparison...

[Tired Old Man]

Truth be told, if RC Ignitions spent as much on advertising as DA there would be more modified G-62's on the market than DA's. For $600.00 you get a DA 50, for about a hundred or more less you get a 62cc engine that's been modified with a lifetime warrantied cdi ignition and the engine lightened considerably. The G-62 will last the better part of 20 years and never see the repair station unless crashed while the other is widely noted for being returned for service. If the stock 62 muffler is tossed and one of the better after market mufflers is used, such as one from Abell, the DA is no longer in the ball park in any way other than being a couple of ounces lighter.

The truth of this is observable any time planes are class racing or when two of the same plane are flying with the only difference being the engines. The RC Ignition G-62 wins every time. There are some other comparisons out there between the most popular 50 and other engines but this isn't the time or place.

[rcign]

Careful, Pat, you'll hear from sinergy for talking about Zenoah engines...

[Tired Old Man]

You mean Jake Ruddy?

[Pale Rider]

yep

[Colonel Klank]

	Quote: Originally Posted by Brave
	Thanks, that truely is awesome. I bet it sounds pretty good. Do you think a G-62 is too much for this plane?

.

[Brave]

Well, my G-62 has arrived and for another $90 from Toni Clark I'll be recieving the 90 degree carb. intake w/gasket and air stack. If all measurements, and all the very useful information here is correct, then there should be a whole lot less cutting on the cowling. I know performance will be an issue with anything other than a two blade prob. but I like the four bladed. Any suggestings??