Echo vs NHW11 GPH(?)

I measured a 2001, 1.5L Echo, warmed up, burning 0.15 GPH at ~700-800 rpm.

I thought I had the data handy but no luck. Anyone have idle (aka., in "N") warmed up 1.5L data?

I can generate it tonight but was wondering if anyone else has it handy.

Thanks,
Bob Wilson

 

Not really. The engine block is the same but the Toyota papers indicate the cams and pistons are different. There may be some similar parts but they are not going to be major parts.

So last night, I measured with the Prius:

~0.26 lb/min - airflow
15.6 lb/hr - airflow
1.06 lb/hr - fuel flow rate (14.7 ratio)
0.17 gal/hr - gasoline 8.25 lbs/gallon
​

This is a surprising result although the values are fairly close:

	Column 1	Column 2	Column 3	Column 4
0	gal/hr	rpm	model
1	0.15	~700	2001 Echo	1.5L
2	0.17	~900	2003 Prius	1.5L
3	113%	129%	ratio Prius/Echo

Echo measured with ScanGauge, Prius measured with Auto Enginuity.

The difference is small and probably more likely related to the idle rpm. We know the Prius uses an Atkinson cycle and the Echo an Otto but putting both engines under a constant load would have been difficult without a rolling dynamometer. But engine idle is fairly easy to reproduce on both vehicles and fuel consumption measured.

The differences are so small that it would take very careful testing to find the difference between an Atkinson cycle at idle versus an Otto cycle. It would require 'tweaking' the engine idle on the Echo up to 900 rpm to match the Prius. But there was no easy way to normalize with the transaxle loads because the test Echo had a standard, automatic transaxle with a hydrodynamic coupling to the engine.

Thanks,
Bob Wilson