Glow Plugs

[Rcmaster199 at aol.com]

Bill, at the settings you describe, the engine should run fine. The next 
place to look is the possibility of overcompression. The head and/or liner may be 
machined a few thousandths off. Try adding the head shim and run it a little 
richer as Ron and Dave suggest.

I have seen a bunch of Webras run and none seems to have a problem with 
blowing plugs. But these are machined components and subject to natural variation 
so it is possible yours is the lucky engine. 

The Mintor 170 on the other hand is a real plug hog; especially the early 
vintage engines. The later vintage has head shims added for smoother more 
reliable function and it helps in that area.

hope that helps a little and good luck

MattK
> Subj:Re: Glow Plugs 
> Date:7/8/2004 10:27:46 PM Eastern Daylight Time
> From:phelps15 at comcast.net
> Reply-to:discussion at nsrca.org
> To:discussion at nsrca.org
> Sent from the Internet 
> 
> 
> 
> Matt:
> I have a Greve pipe, and it's 29 1/2 to rear baffle, and 32 1/2 to end of 
> pipe.....by all estimates, very conservative...... I use 15% nitro/16% oil 
> Powermaster fuel, and am turning a 17x12 7900 rpm.  
> Bill
>  
> 
> >> ----- Original Message ----- 
>> From: Rcmaster199 at aol.com 
>> To: discussion at nsrca.org 
>> Sent: Thursday, July 08, 2004 5:25 PM
>> Subject: Re: Glow Plugs
>> 
>> 
>> Bill, is your pipe set short? The pipe I use (Hatori) has the first 
>> deflector plate located at 23.75" from the glow plug, straight line or around 24.5" 
>> along the centerline of the header. Are you running a large enough prop to 
>> keep rpm at around 78-8000 or so? 
>> 
>> I typically will run one type F plug per 150 runs in the 145, using a 20% 
>> nitro and 19% oil blend. My fuel blend is a 50:50 mix of 10%cool  power and 
>> 30% heli cool power. The large head of the Webra (large heat sink) just about 
>> requires the hot F type plug to run right. I've had limited success running 
>> other plugs in the engine.
>> 
>> hope that helps you 
>> 
>> MattK
> 

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