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what should be mixture output readings?
Posted: Wed Jul 09, 2008 8:38 pm
by rct
ok anyone know what the standard mixture readings are for the rex?
RCT
Re: what should be mixture output readings?
Posted: Wed Jul 09, 2008 9:09 pm
by youngy
That's impossible to say as the mixture is not constant throughout the rev range.
Maximum power comes at 13.1:1 (I think). Between 12.5 and 13.5 is considered ok.
What are you trying to do?
Re: what should be mixture output readings?
Posted: Wed Jul 09, 2008 9:45 pm
by Killerwhale
youngy wrote:That's impossible to say as the mixture is not constant throughout the rev range.
Maximum power comes at 13.1:1 (I think). Between 12.5 and 13.5 is considered ok.
What are you trying to do?
Wot he said^^^
...mine is exactly at 13 when idling....hot that is....
Re: what should be mixture output readings?
Posted: Thu Jul 10, 2008 8:36 pm
by rct
youngy wrote:That's impossible to say as the mixture is not constant throughout the rev range.
Maximum power comes at 13.1:1 (I think). Between 12.5 and 13.5 is considered ok.
What are you trying to do?
just trying to get some baselines to work with.
as i got the 2 into 1 system and i have messed with the air box the next thing will be the carb.
i will need to get it setup right.
RCT
Re: what should be mixture output readings?
Posted: Mon Jul 14, 2008 12:36 pm
by tigkid
As Youngy said, the air to fuel ratio will constantly change depending on what the engine is trying to do at the time.
The stochiometric ratio (not sure if that's spelt quite right), which is the ideal ratio for full power with all the fuel being burnt, is 14.7 (from memory) parts air, to one part fuel.
If your under full power acceleration, more fuel will be added to allow as much power as possible, and also to cool the charge to prevent detonation in the cylinder.
Under steady state cruising, the volume of fuel used should hopefully be much reduced (anyone remember lean burn from the age before catalytic convertors?. That's what the car makers were working on, before they were told we all had to have very expensive, very rare elements included in our exhausts systems).
If you are going to have the engine set up on a dyno, they should be able to read the exhaust to have a good idea what's going on inside the motor, and change jets accordingly.
Hope this helps fuel (sorry) the debate!
Re: what should be mixture output readings?
Posted: Mon Jul 14, 2008 12:48 pm
by youngy
Stoichiometric or Theoretical Combustion is the ideal combustion process during which a fuel is burned completely, however, running at 14.7:1 is likely to wear out the engine fairly quickly, as it is too lean.