• Hi Guest!
    If you appreciate British Car Forum and our 25 years of supporting British car enthusiasts with technical and anicdotal information, collected from our thousands of great members, please support us with a low-cost subscription. You can become a supporting member for less than the dues of most car clubs.

    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

Emission Levels

mgtf328

Jedi Hopeful
Country flag
Offline
Just had the annual safety check done on my '66 BJ8. Although it's not required in the UK for classic cars we measured the emission levels and got the following results.:-

Front 3 Cyls: CO 5.55%, HC 634ppm, CO2 11.47%, O2 0.37%,
Back 3 Cyls: CO 9.27%, HC 4126ppm, CO2 4.1%, O2 6.7%

The difference is obvious! The question is, is the front too lean or is the back too rich?

Anyone know what these figures should be?

Thanks

AJ
 
Last edited by a moderator:
AJ
Hope this helps. Rear richer than front, but i would guess both are too rich. CO should be more like 2% or less.
Phil CO% v AF.jpg

AF v CO.jpg
 
Back
Top