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Midget Mixture

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Midget Mixture
#1
pallman Avatar
pallman Phillip Allardyce
Lara, Australia   AUS
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1969 MG Midget
I have heard that the 1275 with twin HS2 runs a little better if the mixture is slightly richer.

I use a Colortune glass spark plug to achieve a Bunsen Blue flame.

I also use a Carbalancer.

I the READ the plugs. Brick Red electrodes.

Should go ONE FLAT richer on each carb?

Would this be an improvement or not?

I guess you could say try it and see!

I would appreciate some opinions before I start messing with the car.

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Re: Midget Mixture
#2
bim9bill Avatar
bim9bill Bill Debevc
Las Vegas, NV, USA   USA
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1967 Austin-Healey Sprite
2012 Mini Cooper
When I attended my Local British Car Club tune and tech.

The two parts that I did not get right on my car were the following:
1. Mixture I was running too lean, I was told to check the plugs after running it for a bit and adjust. White too lean, black too rich, brown just right.
2. Timing, we adjusted the timing until the car would have a smooth idle. The big test for that was to gun it in second gear from slow speed, If the car hesitated or stalled then the timing needed more adjustment.

I am sure someone will correct me, as I would like to learn more as well.

Bill.


Bill Debevc

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Re: Midget Mixture
#3
pallman Avatar
pallman Phillip Allardyce
Lara, Australia   AUS
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1969 MG Midget
My car hesitates when you load it up in second gear. Perhaps I need to advance the timing a little.

Which way do you rotate the distributor to advance the timing (1275)?

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Re: Midget Mixture
#4
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66jalopy Phillip Jolliffe
Lake City, FL, USA   USA
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1956 Morris Minor
Clockwise, there is a thumb screw for fine tuning bottom of advance shaft. It has an A and R on the body, sometimes needs a little cleaning to read it.

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Re: Midget Mixture
#5
pallman Avatar
pallman Phillip Allardyce
Lara, Australia   AUS
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1969 MG Midget
Great!! Phillip.

Thanks for that.

My distributor has has that adjustment wheel removed at some time in its past.

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Re: Midget Mixture
#6
S1 Elan Kurt. Appley
Akron, Ia., USA   USA
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1964 Lotus Elan
1965 MG Midget MkII
In reply to # 2857509 by pallman Great!! Phillip.

Thanks for that.

My distributor has has that adjustment wheel removed at some time in its past.

If you are missing that wheel then there would be no way of locking the distributor plate and could be the source of all kind's of problems.

Kurt.

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Re: Midget Mixture
#7
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RKM Richard Marcks
Palm Desert, CA, USA   USA
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2x on what Kurt said.

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Re: Midget Mixture
#8
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littlecars David Bassett
Nashville, TN, USA   USA
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1963 Chevrolet Corvair "Cheeto!"
1965 Chevrolet Corvair "Ski Team Transport SOLD!"
1965 MG Midget MkII "Buffoon --- SOLD!!!"
1966 MG Midget MkII "Swiss Cheese...SCRAPPED"    & more
Is the little wheel for fine tuning, or just to keep the dizzy shaft snug? Mine is frozen in place.

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Re: Midget Mixture
#9
66jalopy Avatar
66jalopy Phillip Jolliffe
Lake City, FL, USA   USA
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1956 Morris Minor
If you look real close you will see an "A & R" with a double arrow between them
You can vary timing with the wheel. It may be there to retard it a little when hand cranking.

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Re: Midget Mixture
#10
S1 Elan Kurt. Appley
Akron, Ia., USA   USA
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1964 Lotus Elan
1965 MG Midget MkII
As I remember it only changes the timing a few degrees. I imagine it was to compensate for different fuel. The wheel does keep the Vac advance which is attached to the points plate from moving in and out.

Kurt.

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