DOHC - 2.3L Duratec / Mazda L Engines Discussions and Topics specific to the Duratec 4 cylinder engines

Redline and max rpm before float

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Old 03-16-2019
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Redline and max rpm before float

What is the factory, tuned, and valve float rpm's?
redline
Max engine capable rpm at full fuel pressure
When does valve float occur on the rpm band
 
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Old 03-16-2019
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Not a spec that's published or even tested for, you can calculate it if you have the CAM data and spring data

2.3l Duratec In a Ranger is a Mazda L 23NS with these specs
2004+ Ranger 2.3L Duratec
143 hp @ 5250 RPM
154 lb⋅ft @ 3750 RPM

So I would say around 6,000RPM would be where you would get loss of power, about 700rpm above max HP RPM
Ranger NS23 does have a different cam than the 23EW,
The 2.3l Duratec used in cars had this spec 151 hp @ 5750 so with this cam I would expect 6,500rpm loss of power

The 2.3l Mazda L was 164 hp @ 6000 rpm so 6,700 for that model
 

Last edited by RonD; 03-16-2019 at 11:44 AM.
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