Hi,

I just recieved my ScanGauge II (great product, btw) and was setting it up to calculate my 8's fuel efficiency. During the setup, the user must enter the displacement of the engine and the capacity of the fuel tank. The ScanGauge is most likely set up for calculating numbers for regular piston engines and not for rotaries, so I didn't enter "1.3" as my engine displacement. Instead, I read a while ago that the Renesis, in terms of power output and fuel consumption, is equivalent to a 3.2L V6. So I entered "3.2" as my engine's displacement.

However, to make sure, I did a search on this forum to glean the true fuel consumption equivalent to the Renesis. What I found was that the most widely-accepted displacement number when comparing a V6 to the Renesis is 2.6L. However, the posts that I read were dealing with power output and how insurance companies categorize the Renesis.

Just to be certain, can anyone clarify the fuel-consumption equivalent to the Renesis?

Thanks muchly.

 

The engine displaces 1.3 litres.

You can "compare" it to anything you like, racing clubs like to give it a "x2" handicap, to keep it competitive. Insurance companies like to use higher displacements, to charge more money.

Makes no diff - it is what it is.

If you REALLY think about it, one complete rotation of both rotors displaces 3.9 litres.....


S

 

Why is the engine considered a 2.6L when evaluating the hp/liter and comparing to piston engines?

 

its an airflow issue. When tuning the car on many aftermarket ECU's, you have to set the car up as if it was a 2.6L engine for fuel and airflow purposes. Its tough to make an exact comparision between pistons and rotary's, but most people feel that 2.6L is pretty close.

 

Cool. Thanks for your help, guys.

 

Set it for a 2.6. That's the only number you can enter and get the results that you are looking for.

One complete rotation of the 2 rotor engine displaces 1.3 liters, 2 complete rotations 2.6 liters and 3 complete rotations 3.9 liters. This includes both rotors. Since a piston engine displacement is determined by total swept volume, it does this over 2 complete rotations. The rotary actually needs to rotate 3 times to displace every rotor face even though it is rated at 1.3 liters by calculating total displacement over only 1 revolution. For your calculation to be accurate, you need to get the equivalent piston displacement over time which is 2 rotations or 2.6 liters.