Mintor Head

[Lance Van Nostrand]

Ron,
Your logic makes a lot of sense.  I'm buying it.
--Lance

----- Original Message ----- 
From: "Ron Van Putte" <vanputte at cox.net>
To: <discussion at nsrca.org>
Sent: Tuesday, June 14, 2005 9:12 PM
Subject: Re: Mintor Head


>
> On Jun 14, 2005, at 8:32 PM, Ed Miller wrote:
>
>> Anyone have a Mintor head for an OS 140 they'd like to part with ??
>
> No.  I've using mine and you can't have it!
>
> Seriously, I am using a Mintor 1.40 head on my OS 1.40 RX and tried 
> something different.  When I got it, I asked Lance which was the preferred 
> installation orientation and he responded that he installed it with the 
> "extra" plug to the rear.  I told him that I thought installing it with 
> the extra plug to the front might be better, for two reasons.  First was 
> that the greater percentage of unburned fuel/air mixture was probably in 
> the front of the cylinder and a plug there would do more good.  Second was 
> that a rear installation of the plug would expose it to more hot, burning 
> gases, which could degrade the plug.  He suggested that I try my idea and 
> report back.
>
> I've run the Mintor head that way for more than two months and like the 
> way my engine runs.  Is it better?  Yes.  I did notice several things. 
> First, the engine does go through the midrange better than with a standard 
> OS head.  Second, you should add a second head shim to reduce the 
> compression ratio or plug life may suffer.  Third, if you don't add an 
> extra head shim, sooner or later you'll have a "center " plug failure 
> (element gone).  Fourth, if the "center" plug fails, the "other" plug will 
> get you through the flight, albeit at reduced top-end power.  Fifth, you 
> should use Locktite when you first install the plugs, or the plugs will 
> tend to back out.
>
> Would I buy/use another Mintor 1.40 head on an OS 1.40RX?  Yes.
>
> Ron Van Putte
>
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