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Tech Forum : air/fuel mix in an m20?

- BMW E21 Community
   - Tech Forum
      - air/fuel mix in an m20?
MayanArch   Posted Saturday, May 3rd 5:06am [Edit] [Quote] [IMS] [View car]
Member
Post nr. 1544
   
Florida, USA
Baur E21 2.7 1982, Baur E30 318i 1985, 323i 1978
What is the ideal air/fuel mix in an M20?

If you could hook up a wide band meter to your engine.....what mixture is ideal, and at what points?

BruceH   Posted Saturday, May 3rd 2:50pm [Edit] [Quote] [IMS] [View car]
Member
Post nr. 1169
   
Atlanta, GA USA
81 323 Baur, 85 745
Unless turbo'd isn't stoich the target?

MayanArch   Posted Saturday, May 3rd 8:55pm [Edit] [Quote] [IMS] [View car]
Member
Post nr. 1545
   
Florida, USA
Baur E21 2.7 1982, Baur E30 318i 1985, 323i 1978
Googled it and they say 14.7:1........

Is that an optimum number for combustion that should be reached for throughout the RPM range??

What is stoich?

TJ   Posted Sunday, May 4th 7:19am [Edit] [Quote] [IMS] [View car]
Member
Post nr. 59

NY, USA
82 528e2i 84 320i/4 80 320i
14.7 is a best compromise between fuel consumption, torque, and emissions, particularly for catalytic converter equipped cars. The best ratio for torque is around 12.5:1.

I think EFI setups generally aim for 14.7:1, except at WOT where it lets it run a little richer for greater power and detonation resistance.

BruceH   Posted Sunday, May 4th 5:13pm [Edit] [Quote] [IMS] [View car]
Member
Post nr. 1170
   
Atlanta, GA USA
81 323 Baur, 85 745
Stoichiometric is 14.7 to 1.

http://en.wikipedia.org/wiki/Fuel_mixture

MayanArch   Posted Tuesday, May 6th 1:57am [Edit] [Quote] [IMS] [View car]
Member
Post nr. 1546
   
Florida, USA
Baur E21 2.7 1982, Baur E30 318i 1985, 323i 1978
Jawohl!


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