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Need Co% numbers for tuning
- Thread starter 1michael
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RonMacPherson
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you're in San Diego, so most places have four or five gas machines. With one of these you really don't need to know what the co should be, as a good tuner, or user of the machine will be able to adjust. Lowest co, until the hc's start rising, and I forget what the O and O2 targets were, but I'm sure a good tuneup man can dial it in.
TR3driver
Great Pumpkin - R.I.P
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61 is well before any smog modifications, so the CO will be very high by modern standards. I'd guess the spec (if there ever was one) is something like 2.5 - 5.0 percent.
Since the mixture adjustment affects the entire range, not just idle, setting it lean to get the idle CO down may cause problems at other throttle settings.
Since the mixture adjustment affects the entire range, not just idle, setting it lean to get the idle CO down may cause problems at other throttle settings.
boxofparts
Senior Member
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CO Vol % at stoichiometric A/F of 14.6 is around 0.5%.
As you enrich the mixture, which is where your Healey likes to run , the CO vol % will increase.
16 A/F 0%
14 A/F 1-2%
13 A/F 3-5%
12 A/F 5-8%
As you lean out the mixture your CO will go to zero.. that is too lean. I would shoot for just rich of stoich..1%.
Different fuels have different Stoich points. California fuel is around 14.2 where the Federal fuel is around 14.6.
If you really what to tune the engine get a A/F sensor . They are $200.
As you enrich the mixture, which is where your Healey likes to run , the CO vol % will increase.
16 A/F 0%
14 A/F 1-2%
13 A/F 3-5%
12 A/F 5-8%
As you lean out the mixture your CO will go to zero.. that is too lean. I would shoot for just rich of stoich..1%.
Different fuels have different Stoich points. California fuel is around 14.2 where the Federal fuel is around 14.6.
If you really what to tune the engine get a A/F sensor . They are $200.
Thanks guys for all the info. I own an old smog machine that I tune all of my old cars with. I figured it to be at about 3.5 - 4.5 as with many other euro cars. You guys are great!
The good news / bad news is....
Good news...I got the car dialed in and it runs fantastic.
Bad news... Rear main seal is leaking big time.
I guess this weekend I'll pull the tranny off and get one of those new-fangled seal kits.
The good news / bad news is....
Good news...I got the car dialed in and it runs fantastic.
Bad news... Rear main seal is leaking big time.
I guess this weekend I'll pull the tranny off and get one of those new-fangled seal kits.