[Healeys] Fuel Mixture

[Chris Dimmock]

Hey Keith,
That's the right plug for a standard engine, according to this  http://www.gsparkplug.com/shop/champion-un12y.html
Is your engine standard?
However, it doesn't sound right to me.
Back in my Sprite days, we ran Champion N9Y in a road car, and N7Y in  
a modified road car.
I'm pretty sure a higher number is colder in NGK.
My BJ8 runs NGK racing B8EGV on the road, as I said earlier, and  
B85EGV on a full throttle circuit.
Ie yours are 5, mine are 8.
You are running a very hot plug. If it has soot, then either it's  
running is too rich; you have some crap fuel; or the engine is no  
where near operating temperature.
Give it a run on a freeway and then do a plug cut. ie check the plug  
colour  when you switch off after several minutes at over 4,000 rpm.
I certainly wouldn't drive a car hard (over 5,000 rpm)  for any  
sustained period of time (more than a few minutes) on a plug that hot.
Best
Chris
Sent from my iPhone

On 11/10/2011, at 6:57 PM, "Keith Bailey" <keithbailey5 at bigpond.com>  
wrote:

> Hi All
>       The Plugs are NKGR BPR 5ES
>       Regards Keith
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