os sx 50 hyper mod

[Hassan]

Hi, I was jusdt wondering if any of you guys tried modifying your 50 hyper, Like cylinder porting and crank shaft modification. I can't get enough of the power. Any help is appreciated. Thanks.

[DavidH]

If you can't get enough power with the OS Hyper 50. Then I would think something is wrong with the engine. Or maybe you just don't have it tuned and running correctly. Most (nearly all) of the Hyper 50's I have seen being used in 50 size helis. They have so much power and rpm's that it is difficult to utilize it all. Some pilots even cut back on the throttle curve to keep the motor from turning so many rpms.

David

[Hassan]

David, we set it to the maximum. and it is giving me enough power just like a hyper should. but I'm talking about modifications. Coz one of my friends ported his engine's sleeve and he's got more power.

[flyinfool]

Hehe
The vehicle with enough power has never been built. :twisted:
I hear what you are asking. My hyper is making as much power as anyones, with a Hatori JK pipe and 30%, but I to would like more of a good thing.
I can and will use as much power as I can get.
I was thinking about trying some 60% nitro boat fuel and just add some extra oil to it, and add a couple of shims to the head.
I just don't have the funds for the cylinders that will get hosed in the process of finding better port timing.

[Hassan]

Hi flyinfool, my friend is experienced in cylinder porting....so i'll let him help me. I think 60% is too much.

[mike557]

Maybe I'm missing somthing here. If it aint good enought for you why not fit a bigger engine

[Hassan]

its impossible to fit a bigger engine on a 50 size heli. if i did then i would have to change the gear ratio,tail boom, etc. which would then make it a 90 size heli.

[DavidH]

its impossible to fit a bigger engine on a 50 size heli. if i did then i would have to change the gear ratio,tail boom, etc. which would then make it a 90 size heli.


There is a few 50 size helis around that have 60 size engines in them. As far as blades run 660 mm blades. I have even seen a 60 size engine in a true 30 size heli. Nothing is ever impossible in this hobby.
When you port the engine you have. Your going to have to most likely change pipes and couple other things to get it to run correctly. Horsepower increases always cost money.

David

[flyinfool]

In my case, In order to do racing in the 50 class I can not use a bigger engine than a 50.
I just need MORE POWER. :twisted:

[Hassan]

David I'm ready to pay. What do u advice me to change like pipe, etc. I'm running a 50 hyper which is already ported on a raptor titan.

[WayneBrown]

Here's the deal guys, a no sh**ter on modding engines from someone who is good at it:
To increase power across the board on any production engine, you will sacrifice reliability in some areas, while increasing output in others.
In essence; you can make more full throttle power, but by sacrficing idle and midrange reliability.
Subtle changes will improve overall power without sacrificing a lot, lowering the intake ports, and raising the exhaust ports will add a bit to the WOT power without sacrificing a great deal on the low end.. However you will notice a degradation of the lower RPM consistancy.
One of the best mods for more power; scar up the interior of the crankshaft. Changing the smooth surface to a rough surface mixes the air/fuel mix making it a more complete vapor, allowing a better burn. Scoring the exterior of the cylinder and the port for the fuel charge on the crankcase will facilitate this as well, and is a bit easier to do, the crankshaft is HARD and balanced, the clylinder is hard, but the case is Aluminum, and can be modded.
Swapping carbs is another tuning mod that is non-invasive, and should work with testing.
Going to a straight tuned pipe (Macs tuned pipe) will net an increase in power, but over a shorter power range if tuned one way, a broader range if tuned another, bear in mind that a true 'tuned pipe' will suffer loss of midrange, and transition from mid to high, right where helis need the power the most.
Upping the nitro is a bad idea, Plugs will only last until you open the throttle to full WOT, and then will burn out due too lean conditions @ transition to 'on pipe'.
I've been experimenting with a few YS 91's lately to show an increase across the board, and have been semi-successful, there is a very fine line between making a positive change, and junking parts. Discovering the max power at mid-throttle is the hardest, I have one engine that runs very, very strong in that range, but teh same changes on a different cylinder/piston did not net the same results..More top end power, but a severe loss of midrange.

[Monsterbee]

Mr. Brown that heli your holdin there in the photo looks to me as if it is powered by a Y.S. 80 . Be careful as you can suck the clouds right outta the sky! ! !

[WayneBrown]

I guess I better fly it then, looks like rain! :D