[NSRCA-discussion] engines woes

[vicenterc at comcast.net]

Anthony,

What brand and type bearings are you using?  I was using a brand that does not have ss shields.  I had similar problem and decided to use Boca Bearings that has ss shields.  The think that fixed my problem.  I suspect that the plastic material started to breakdown with the nitro and high temperature (after many runs. probably more than 150 flights) and was contaminating the glow plugs. 

Vince  



-------------- Original message -------------- 
From: "Anthony Romano" <anthonyr105 at hotmail.com> 

> Having some trouble with my RX having an erratic idle and an appetite for 
> glow plugs before the Nats. Replace both bearings that seemed perfect, as 
> was the rest of the internals, and cleaned some carbon of the piston before 
> the Nats. Idled and ran better but was a little tight on the next run. This 
> seemed to improve quickly as the bearing seals seated but down on power. 
> Got to Muncie and was a bit down on power. After ingesting another plug from 
> over twisting the needles I was given a remedial needle valve lesson by Ron 
> Lockhart and switched to 30% Nitro. Made it through the Nats without much 
> power. 
> Today went to back to 20% for the lower heat and made sure I had the needle 
> set 7600 rpm launch from a 7800 rpm peak on a pinch. When taxiing it loaded 
> up and quit and wouldn't restart. Another new plug and double check the 
> needle and made a weak flight. Second flight same thing but this time got it 
> restarted without replacing the plug. 
> Now here is the interesting part. This engine has always had a lot of fuel 
> gooped on the head and header. Today noticed a lot on the bottom of the 
> plane. I am thinking either a bad ring or some damage to the crank port or 
> the case. Any other ideas? 
> 
> OS 1.40 RX 
> SS bearings 
> Aeroslave pipe 25.25 from baffle to plug 
> 15.75*10*3 APC 
> 20% S&W fuel 
> OS type F 
> 
> Can't afford to change to other power source so any ideas on this one would 
> be helpful. 
> 
> TIA 
> 
> Anthony 
> 
> 
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