What is the best air-fuel mixture ratio?
The stoichiometric mixture for a gasoline engine is the ideal ratio of air to fuel that burns all fuel with no excess air. For gasoline fuel, the stoichiometric air–fuel mixture is about 14.7:1 i.e. for every one gram of fuel, 14.7 grams of air are required.
What should full throttle AFR be?
If you prefer better PERFORMANCE then we suggest to run an AFR of 13.5:1 or even richer to around 13:1. Driving full out within a gear will bring you into our FULL THROTTLE zone. Best performance for most vehicles is in the 12.5:1 to 13:1 AFR range.
What AFR makes the most horsepower?
A naturally aspirated engine, running on pump gasoline will normally make the most horsepower at an AFR of about 12.8 – 13.0. An AFR of about 14.6 will produce the best fuel economy.
How rich is too rich AFR?
Best performance for most vehicles is in the 12.5 to 13 AFR range. Going too rich will have the opposite affect and decrease your performance. Getting up to cruising speed or getting ready to pass someone, you usually are looking for the performance to get up and go.
What happens when air-fuel ratio is too rich?
If the ratio is too rich or too lean, the engine will not burn optimally burn the air-fuel mixture which can cause performance issues or use up too much fuel. The ideal air-fuel ratio that burns all fuel without excess air is 14.7:1. This is referred to as the “stoichiometric” mixture.
What’s the compression ratio on a Nissan SR20DET?
This is proven when you do a compression test on an SR (about 160psi) and B18C5 honduh motor (270psi or so). Normally aspirated motors get their power through this high compression, generally speaking the higher the compression ratio the more power it will make (with the right fuel).
What kind of engine does a Nissan SR20 have?
Nissan SR20 engine specs Manufacturer Yokohama plant Also called Nissan SR20 Production 1989-2007 Cylinder block alloy Aluminum Configuration Straight-4
When did the Nissan SR20DET black top come out?
It appeared in 1994 and its various versions were produced till 2002. SR20DET Black top is used on Nissan 180SX S13 and Nissan Bluebird, and it differs from Red top with black valve cover, oxygen sensor, ECU software, modified head ports, and also pistons are made of another material.
When did the Nissan SR20DE Roller rocker come out?
In 2000 SR20DE roller rocker appeared. These engines were equipped with roller rockers and camshafts 232/240 deg, lift 10.0/9.2 mm. And also they used new valves (3mm shorter), modified valve springs, light pistons, lighter crankshaft and short-length intake manifold.