[Mgs] Carbs still being nasty

[Clayton Kirkwood]

The rear carb seems set properly. I was able to get that little increase
with the lift of the 1/32 pin lifter. The front carb has been more trouble:
screwed all the way in, I can't quite get the jet up all the way to the
bridge, but with some tinkering of bowl valve, I was able to get the fuel
right up to the bridge. It runs smoothest when rich, but lifting the piston
causes it roar away and not stop. So currently, I have the nut screwed up
all the way. The pin makes no difference, but lifting the piston some
increases speed for a bit and then dies.

I found my sychrometer on the front of my cabinet where I put about 10 years
ago. It is an airflow tester with the little ball which is supposed to go up
to the middle of a clear tube. Never could get it to move no matter the
speed.

I finally got the sound the same through the tube method. We'll see. In
doing all this, I looked over and saw a tiny stream coming out of the
radiator. Urrrr

Clayton


-----Original Message-----
From: Eric J Russell [mailto:ejrussell at mebtel.net] 
Sent: Wednesday, December 28, 2016 11:53 AM
To: mgs at autox.team.net
Cc: crk at godblessthe.us
Subject: Re: [Mgs] Carbs still being nasty

> I have no idea which kind of SU's I have. This is on a 62A. How am I 
> to tell?

Original MGA carbs are H4. It is also possible for them to be replaced by
MGB carbs - HS4 or HIF4. (HS = H type, seperate float chamber, HIF = H type,
internal float chamber, the number 4 is a measure of the throat diameter - 1
inch plus 4 eighths of an inch - 1 1/2"). Pictures of many SU carbs are
available on Joe Curto's website: http://joecurto.com/carburetor-library

For almost anything knowable about the MGA (and most of it also applies to
the MGB) see Barney Gaylord's MGA Guru Tech Pages.
http://www.mgaguru.com/mgtech/

For info about the MGA's H4 carbs see: 
http://www.mgaguru.com/mgtech/carbs/carb.htm
For tuning info: http://www.mgaguru.com/mgtech/carbs/cb130.htm I like the
little tool kit shown there. I also have an SK Synchrometer (measures air
flow). After using the pointers to synch the carb I've used the synchrometer
to double check and always found it spot-on.

Eric Russell
Mebane, NC