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SubmitterferalMore Photos from feral   Last Update2006/1/27 23:53    Tell a friendTell a friend
Hits2666  Comments2    0.00 (0 votes)0.00 (0 votes)
This is a sedan being done up by a customer. He still has to get suspension, brakes,and wheels but the car is already looking very nice.

It made 54.8 RW Kw's with AFR still at 12:1, with correct jets available it should make 60 RW Kw's. Engine is 1mm oversize A12.

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Poster Thread
Posted: 2006/1/28 21:08  Updated: 2006/1/28 21:08
No life (a.k.a. DattoMaster)
Joined: 2003/12/3
From: Christchurch NZ
Posts: 3704
What AFR would you consider to be ideal? I have been running mine high10:1-low11's. Even with cold plugs, (BP7ES) the plugs still have a pinkish tinge to them.

Poster Thread
Posted: 2013/4/11 5:49  Updated: 2013/4/11 5:52
Joined: 2001/5/3
From: Hawaii, USA
Posts: 31334
With gasoline engines, maximum HP is made from about 14:1 to 12:1. At 12:1 it is using far more fuel, but it will reduce combustion temps. See Garrett turbochargers.

At 14:1 you will still get the same HP, but use less fuel. As long as the engine survives (doesn't overheat components) 14:1 is preferable to 12:1. It results in better fuel economy at MAX power and less wear to the engine from unburned fuel particle. With EFI it is easily controlled. With carburetors it requires careful jetting -- which is why carbs are often jetted far richer just to be on the safe side to prevent lean-out or detonation.

The "stoich" ratio is 14.7:1 and will result in the least average emissions, but will make less power than a slightly rich ratio (e.g. 14:1).