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Gasser Model RC Helicopters > Why does a 26cc engine vibrate more and louder than a 2000cc 6 piston car engine??
 
 
jascamera
Veteran
Location: brooklyn, NY

Why does a tiny 26cc engine vibrate more and louder than a 2000cc 6piston car engine?? I notice when cars drive by, I can't even hear the engine noise, nor does it vibration as much when they have much bigger pistons and 4 to 12 of them running.

I have a honda generator, the engine runs silky smooth too. Does this mean the Z260 is a inferior design?? Is there other motor options available? I know about Hanson and Toxic. Lean toward a Toxic Stage II mod. Any other engine out there?? Someone should really design an engine like the cars.
06-29-2008 08:19 PM
 
 
pgkevet
Senior Heliman
Location: surrey UK

..you can't compare single cylinder 2-stroke to 4-plus cyclinder 4-stroke evenly balacing a crankshaft and sitting on huge rubber dampers in a soundproofed chamber and a 10 foot exhaust??

..but I'll still bet a lot has to do with mass production on accurate machinery in a competative environment where sound and reliability are major selling points. It wasnlt that long ago when getting in the car was no guarantee that you'ld get to your destination and running into town was an adventure.. then suddenly everyone had to compete with japanese reliability and up their game..

pgk
06-29-2008 08:48 PM
 
 
Rotorwacker
Heliman
Location: Nederland TX, USA

If you think about it the reasons are numerous.
The first is the R.P.M.s involved, the car driving by is cruising at probably between 2000-4000 RPMs and the heli is turning 12,000-14,000 RPMs.Turn a 2000cc Honda engine 14,000 and compare,it will make you want to run from it.
Also the car engine is rubber mounted in the chassis,and has a harmonic balancer. Multi-cylinder engines will always run smoother,for many reasons, the power pulses are evenly spaced out,instead of one major pulse per revolution.I'm sure others can elaborate more.
Danny

I Love RC Helis,and have the Receipts to prove it
06-29-2008 08:53 PM
 
 
turboomni
Elite Veteran
Location: 63 Rambler Down By The Dumpster

Quote 
Why does a tiny 26cc engine vibrate more and louder than a 2000cc 6piston car engine??

Because it wasn't sent to Hanson to be balanced!!

Setup is everything, All my heli's can fly better than I can pilot them
06-29-2008 10:54 PM
 
 
toejab
Senior Heliman
Location: NEW YORK

....can't comment on the noise,other than to agree with what was already said about the high RPM's...and lack of a quite muffler being the cause. also....i have never heard of the G230 having vibration problems...hind site...i would have gone that route over my G260,(well actually the G260 came on the heli,second hand heli)...it has come back from hansons,i cannot comment on it yet as i have not tried it, but i am sure that it will be more powerful and smooth as silk....also...many people do not bother to dial in their fans as they may be "self balancing" due to the mount set-up....dial them in , you cannot go wrong, every little vib adds up!!,larry

IF I AIN'T FLYIN' - I'M PROBABLY BUYIN'
06-30-2008 01:24 AM
 
 
jschenck
Elite Veteran
Location: La Vista, NE.

There is a simple answer! The exhaust system in my car weighs more than my entire heli! Take the muffler and pipe off your car, replace it with a can like on our heli's and see which is louder! Ever run a motorcycle with the exhaust system off? It sounds stupid and will make your ears bleed. The loudest engine I've ever heard was a 410 Sprint car - open exhaust pipes, methanol, crazy compression and no flywheel.

The exhaust noise is one part of this equation. Take the air filter housing assembly off your quiet car, it will no longer be quiet

Open intake and light/performance exhaust on a 2-stroke=noise (good noise!)

...yep...
06-30-2008 05:06 AM
 
 
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Gasser Model RC Helicopters > Why does a 26cc engine vibrate more and louder than a 2000cc 6 piston car engine??
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