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| Mixture question https://ausmini.com/forums/viewtopic.php?f=2&t=101083 |
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| Author: | Steam [ Mon Aug 02, 2021 9:26 am ] |
| Post subject: | Mixture question |
1275 engine and No 1 & 4 always burn leaner than 2 & 3 which is a quirk of the A series. Question is I assume it is better to have 1 & 4 correct with 2 & 3 somewhat rich rather than running the outer 2 cylinders lean? |
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| Author: | GR [ Mon Aug 02, 2021 8:19 pm ] |
| Post subject: | Re: Mixture question |
Hi Steam If your mixtures are correct it's not really a problem, but if your are worried about it you can run one heat range colder on 2 and 3 as BMC did back in the day  in competition, some times they run higher compression in 2 and 3 (one point higher)Graham Russell |
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| Author: | murty [ Thu Aug 05, 2021 10:19 am ] |
| Post subject: | Re: Mixture question |
What air-fuel ratios (using a wide-band O2 sensor to tune) are normally used at cruise and full load? |
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| Author: | GR [ Thu Aug 05, 2021 8:18 pm ] |
| Post subject: | Re: Mixture question |
HI Murty With the SU caries 14 to 15 on cruise full load 13.5 to 14 With webers 13 to 14 on cruise full load 12.5 to 13 Graham Russell |
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| Author: | murty [ Thu Aug 05, 2021 11:54 pm ] |
| Post subject: | Re: Mixture question |
Thanks Graham |
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| Author: | Steam [ Fri Aug 06, 2021 9:38 am ] |
| Post subject: | Re: Mixture question |
GR wrote: Hi Steam If your mixtures are correct it's not really a problem, but if your are worried about it you can run one heat range colder on 2 and 3 as BMC did back in the day in competition, some times they run higher compression in 2 and 3 (one point higher)Graham Russell Thank you Graham, excellent advice as usual. It is not worrying me enough to change the inner plugs, i will keep 1 & 4 Correct with 2 & 3 slightly richer. All good. |
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