[Healeys] Gunson Colortune

[Bob Spidell]

I got a small ($250) bonus one time, but it came in the form of a gift card (hate those--gimme cash!). Anyway, trying to spend most of the card on one item I ended up buying a Gunson exhaust gas analyzer. Although the readings (mostly) made sense, I didn't think the effort accomplished much more than you could get with Colortunes (plus, the EGA used plastic tubing that started to melt). 

I think, overall, you can get pretty good results just setting the mixture for best/fastest idle, then enrichening an eighth to a quarter turn to be on the safe/power side of the curve. Most fixed venturi--i.e. 'American-style'--carbs are set this way, but set 50RPM on the lean side of best idle for smog reasons. If you're tweaking for max performance at certain RPMs you're pretty much gonna need a dyno, IMO. 

Bob 


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Bob Spidell - San Jose, CA 

----- Original Message -----

I found the plastic tube that holds the mirror will melt if you leave it in 
place too long. Now I use an old Heathkit gas analyzer I bought off Ebay. 
BJ8's separate the exhaust gases, so I measure the richness at the pipe of 
the carb I'm adjusting. 

- Tom