• Hey Guest!
    British Car Forum has been supporting enthusiasts for over 25 years by providing a great place to share our love for British cars. You can support our efforts by upgrading your membership for less than the dues of most car clubs. There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Upgraded members don't see this banner, nor will you see the Google ads that appear on the site.)
Tips
Tips

SU Carb Adjustments

Share this page

KVH

KVH

Obi Wan
Silver
Country flag
Offline
Car runs great, but I get black splatter out my exhuast pipes. Despite using the piston lift/RPM method of adjusting mixture, my guess is that I'm too rich. I'm 14 flats down on each jet. Too much?

Suggestions on readjusting?

thx
 
What happens if you lean them out a couple of flats, and retry the lift the piston test?

Stock cam ? Checked the valve clearances ?
 
Maybe I'm misinterpreting your choice of words, but "splatter" would imply black moisture, which is normal for the first few seconds on a cold choked start. ??
 
Condensation and a little carbon out the tail pipe when cold is normal enough.
I believe most SU tuners recommend 12 flats as a starting point when tuning from scratch and that has always been too rich on my car.
However, if it runs great and is crisp at take off.....
 
If you go easier on the choke, you'll get less carbon. But the water is perfectly normal; in fact it's there all the time but usually it's invisible vapor.
 
Back
Top