[Healeys] High speed miss

[Oudesluys]

Do not bother with the point gap, measure the dwell angle as that is the 
primary decisive factor. With the point gap measurement you may get an 
approximation of the proper dwell angle, but uneven wear on the points 
upset the setting.
Dwell angle is measured with an automotive universal meter (Volts, Ohms, 
Amphres, dwell, rpm) that is available at any motor spares shop for 
little money. Most are surprisingly accurate.
Generally the dwell angle for a 4-cylinder engine is 500 +/- 30 and for 
a 6-cylinder engine this is 360 +/- 20 but check your shop manual for 
the value specified for your vehicle.
After having set the dwell angle you also have to adjust the ignition 
timing.

Kees Oudesluijs
NL


Op 20-8-2013 14:36, healeyguy at aol.com schreef:
> John
> This reminded me of a 15 year old kid trying to work on his first car many
> years ago. That would be me. I copied this from another source since it tells
> the story so well:
>
> Problem Areas: Each time the points open, a very small amount of metal is
> transferred from one side of the points to the other. This transfer is uneven,
> and in effect closes the point gap. The second problem area is the fiber block
> that rides on the distributor cam and opens the points. This fiber block not
> only seats itself on newly installed points, but wears on points that have
> been in use for long periods of time. The combination of wear and metal
> transfer will eventually close the points completely, and the engine will no
> longer run.
>
>
> Symptoms: As the gap begins to close beyond some rather broad limits, the
> engine will start to misfire under hard acceleration. As the gap closes even
> further, the engine will start to miss at normal road speeds. Further closing
> of the gap will result in an engine that is hard to start and impossible to
> make idle properly. These symptoms are very similar to those of fuel
> starvation caused by a faulty fuel pump, plugged fuel line or filter, or dirty
> carburetor.
>
>
> Conclusion: Before taking the fuel pump apart or tearing into the carburetors
> - both messy jobs - check the point gap.
>
> Aloha
> Perry
>
>
>
>
> -----Original Message-----
> From: john spaur <jmsdarch at sbcglobal.net>
>
> The car is running pretty well but I notice it seems to run out of
> ower at high speeds. I have a Lempert differential (3.54) with a
> enis Welch street cam.
> At around 80 mph, with the tack reading close to 4000 rpm it starts,
> o miss a little when I accelerate. Is this normal or could the carbs
> e set a little lean?
> John Spaur
> 62 BT7
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation  $12.75
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
>
> Healeys at autox.team.net
> http://autox.team.net/mailman/listinfo/healeys
>
> Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/coudesluijs@chello.nl