ORIGINAL: aussiesteve
ORIGINAL: mpascual
Like Saito small gas engines ? The FG36 (36cc) does not have needle bearings on the con-rod.
Like oldies spark plug small engines ?
On a 4 Stroke engine the amount of fuel (with oil) is smaller than a 2S engine and oil-fuel flow mix does not goes directly to crankcase (and con-rod) as 2S does.
Lubricity of gas(petrol) is much more than methanol.
I've count the needles on a small needle bearing availables today (caged), and the contact surface with the crankshaft pin is so small and can cause more troubles than a plain bushing.
Only my experience.
Best regards
Whilst I do applaud Michaels attempts to creat something attractive to part of the market by making it a little diufferent to the myriad of other offerings fom his countrymen, He has not done to well so far in making his offerings anywhere near to decent for regular flight over an extended number of flying days.
A couple of things about your post
Comparing anything of Michaels creation to a Saito is quite an insult to Saito
Who has compared engines ? I've oly said Saito engines does not mount needle bearings, only plain bushing on the crankshaft side , and nothing on wrist pin side on some gas engines
The ''Oldy'' engines to which you refer also ran high oil QTY in their fuel.
And people using this kind of engines keep manufaturers instructions about recommended fuel/oil ratio. Do the same on NGH engines.
I never realised the NGH 9cc was a 4 stroke - why even compare it to one? On a 4 stroke, the heat input is also for half the revolutions of a 2 stroke.
Are you sure? I know the difference between a 4s and a 2S. Only was a reference to compare with engines with less lubrication and higher running temp than a 2Stroke
Michaels creations to date have a long history of early crankpin / bushing failures - that is called the proof in the pudding.
Maybe you're saying Saito gas engines does not have crankpin/bushing failures? We can talk about crank pin bushing/needle bearings failures on MANY engines brands. What's the first ?