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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator Docs  Radikal 20 FYI
10-25-2012 02:04 PM  5 years agoPost 1101
Billme

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MS

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Want more top end power ?
I have been a fan of the 257, but it was left behind in the big block testing...I'm back to fiddling with the Rad 20, and decided to try it on the Zenoah 20.. I used a bored out 257...
I haven't tested it on a pure stock, but I bet it would work fine...
This carb atomizes the fuel better than any carb I know, and learning the needles is easy, and best of all, not so finicky .Well, its been my experience anyway..
I thought it would be to big for the Zenoah 20, but its within reason... You will be much leaner on the needles than the stock, but you will find it will be much easier to tell what the engine needs..The hover is smoother, and the topend is much better ...
Mine you i run a semi modded engine, and also run a Rad 30 clutch with a spraqe auto clutch running 640s on a 13 tooth pinion..
let me say this is for those who want everything out of the little 20. If you are doing good with the stock carb, and the way you fly, its perfectly ok to keep running it...just saying..
Bill
update: took the bored out one off, and put the stock 257 on, where as the only change was the low needle setting to 11/4.. Much better..Do not bother with bored out type...

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10-25-2012 11:26 PM  5 years agoPost 1102
Gearhead

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Vt

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Bill, very cool,,but I have a question, on the stock 257 the front of the hole is smaller than the Butterfly, so did you just bore out the front to mach the Butterfly or did you bore it all the way threw so you can use a larger Butterfly ??

thanks for the good info !!!!!!!!

Jim
Buzz Buzz Buzz

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10-26-2012 01:18 AM  5 years agoPost 1103
Billme

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MS

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You can only go to the high speed nozzle on the boring..You are really changing the front air intake ...You can tell a difference too...
Chris Sirchek done a fantastic job with these carbs..I hope I didn't butcher his name bad, I can never remember how to spell it

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10-26-2012 05:36 AM  5 years agoPost 1104
RM3

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Killeen, Texas - USA

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Bill,

I did a similar mod to the carb...removed the choke and then cut out the lumps and bumps from the carb intake, then refilled with steel epoxy putty, and then reshaped with a clean "funnel" shape into the high speed nozzle...then filled the cut out portion of the velocity stack bottom (theres a ring cut out at the bottom) also with putty so that there was a clean flow of air into the carb.

happy to say that it actually gave an increase from 11800 with a 14X6 prop and kissed 11900 rpm.

So now I wonder since my Zenoah is stroked to a 22.5 cc displacement which is the same as a G231 if going with a larger bore carb like the G231 if it will allow me to pull more HP from the engine...right know its sitting at 2.8 HP at 11800.

what do you think?

showing a preference will only get you into trouble, 90% of everything is crap...

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10-26-2012 11:01 AM  5 years agoPost 1105
Billme

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No question it will ....Hanson has been putting the 643 on his version...643 has been the workhorse of the puh, They have been left behind as well for big blocks higher rpm...
As much good work that you have done, it would be worth it to explore both carbs...

Bill

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11-25-2012 10:19 PM  5 years agoPost 1106
RM3

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Killeen, Texas - USA

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Billme,
Well went with the 643 carb on the stroker zenoah 20ei...now it runs the 14X6 prop at around 12200 rpm...just over 3 H.P.! put it back into the Radikal G20 with a 14T pinion...engine has no problem running 2000 RPM on the rotor with full 12 deg pitch with 640 mains...very happy with the power...

considering that it now puts out more power than a stock G231, wonder if stretching the boom to run 680s at 1900 (13T pinion) would be worth while. I guess I would end up with a more powerful yet lighter than G30 size?

...nah...better to buy a G30...Then see what I can do with the engine

showing a preference will only get you into trouble, 90% of everything is crap...

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12-02-2012 02:02 AM  5 years agoPost 1107
Billme

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manoman, this sounds good ... You got me beat on the engine with you running 14 tooth...

I'm building the HWC trex conversion now with a HWC 29.. We'll see how that goes...
Keep the 20 a 20...Its just the right size for a everyday machine...

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12-10-2012 10:36 PM  5 years agoPost 1108
Billme

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manoman, this carb corrects everything, throttle curve, top end power is much better, and best of all, the needles are in a more common position..no more low throttle curve and all that BS..
This is the carb ...just awesome... Much smoother engine
I ended up at 1 turn on the high, and 1.5 on the low..
Set your throttle curve to default and hang on... You can lower the hover throttle if you need to
We should have been listening to boat racers all this time...
Want to thank My long time friend Ernest Montgomery boat engine guru for guiding me with this awesome carb...

BTW, most use a air filter, make sure you in-large the hole on the air filter bigger than the intake on the carb...
I would suggest getting the stock 257 to start out with...
Your operating range on the high will or should be between 11/8 to 1 turn.. The low from 13/8s to 1 5/8s on the rc engine..
My engine settled out in two tanks..

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12-11-2012 03:01 AM  5 years agoPost 1109
Gearhead

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Vt

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Bill, you know I was going to send my carb to you or Chris to have it bored, but HEY, I have a lathe, but no (small) boring tool, so I will just have to buy a small boring tool and do it myself,
nothing wrong with more power and smooth running

thanks for the info Bill !!, you should have your own page

Jim
Buzz Buzz Buzz

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12-14-2012 05:17 PM  5 years agoPost 1110
Billme

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I'm liking the stock better for the 20... Running it on my vario rc engine as well...Just beautiful

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12-14-2012 08:01 PM  5 years agoPost 1111
geomecc

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Long Island ,NY

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is there a different carb that will bolt up to a stock 200pu that would be an improvment to whats there standard issue?

R I P Roman Jr. Team SKOOKUM SRW EFC

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12-16-2012 12:28 AM  5 years agoPost 1112
RM3

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Killeen, Texas - USA

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most carbs that bolt up to a G231 will also fit a G20 as they all have the same bolt spacing...but bolting one up is not that simple as carbs output side will be a bit larger in diameter than the stock 20cc carb... so you would have to find a carb isolator block that mates with the larger carb AND also mates up with the G20 intake bolt spacing that allows for air/fuel flow smoothly between all three items...

The stock carb is plenty for the stock G20 so going to a larger carb does not realy give any gain there (a modded engine is a different story though)....what will help is cleaning up the intake shape to a nice clean funnel shape and removing the choke lever...should be good for about 200rpm...but you won't really notice it while flying.

showing a preference will only get you into trouble, 90% of everything is crap...

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12-16-2012 02:22 AM  5 years agoPost 1113
geomecc

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Long Island ,NY

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thanks

R I P Roman Jr. Team SKOOKUM SRW EFC

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12-16-2012 06:03 AM  5 years agoPost 1114
Billme

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MS

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Do what you want to do.....but, this setup tunes just like a nitro which i thought would be much easier for the novice and advance pilot learning gas engines. The only difference would be your moving the needles 1/16 on the high to 1/4 on the low at the most either way..
The atomization on this carb is very different from a stock carb..Very smooth operation
I don't put this stuff up for everyone to love me, you need to try it before making a wave off judgement...Then see if I'm blowing smoke..
Yes you can match everything up, but I didn't, and it works ....Will it work better if I do? yes, but I'm primary trying a better way to run the gasser in general...

Bill

Had to oorrect the low end adjustment...Made a mistake should have said 1/4 either way...

On the RC engines, I ended up at 13/8s on the low...All the puh's ended up at 11/4 on the low. From the 29, 26, and 20 puh.
All ended up 1 turn on the high
Of course the fuel you burn, and the oil you use can make a difference on these settings, so work up to them...

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04-09-2013 04:17 AM  5 years agoPost 1115
blowerz

rrNovice

Kuala Lumpur,Malaysia

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wt 643 carb
hi.my friend gave me this carb for testing in g20i rad g20..
my question will this work??fitting seem no problems..but the return line from pump?.and what the L and H needle turn should be??
thanks

i believe i can fly

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04-09-2013 02:50 PM  5 years agoPost 1116
Pistol Pete

rrProfessor

Seffner, FL

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3. Standard settings of each needle is as follows:
a. Low-Speed Needle: 11/8 plus/minus 1/4
b. High-Speed Needle: 13/8 plus/minus 1/4

as per manual located here...

http://www.horizonhobby.com/product...etor-ZENE26H#t6

~~Enjoying the hobby one flight at a time~~

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01-06-2018 12:26 AM  7 months agoPost 1117
Aaron Judge

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Central New Jersey USA

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I just put a new Radikal g20 together I had laying around. It’s my first gas Heli but have had nitro birds since the 80’s. Thanks for all the insight into the Radikal and the 20EI as when the weather permits I’ll get it going.

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