DIYbanter - View Single Post - E10 (ethanol/ gas) and 2-cycle engines

jim

wrote:

The other assumption implied by your statement is that the conditions
described -- 9.2 CR, and one bar (14.5 psi) maximum boost -- are conditions
at which maximum efficiency is achieved. Far from it. In fact, running at
14.5 psi of boost, you're either accelerating hard or you're going like
hell.

But that IS where the maximum power is extracted from the fuel. The
highest HP per lb of fuel burned - which translates to the highest
efficiency. On a spark ignition engine that is at the point where
maximum torque is produced, and with the engine totally unthrottled -
ie- wide open throttle loaded to maintain maximum torque

That is true but its not very relevant to fuel economy
for the cars on the road.

Hardly any WOT operation occurs and WOT on
a street car is not very wide open.

---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com