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Great Gas Mileage; MPG Results
Topic Started: Aug 28 2009, 09:41 AM (2,455 Views)
mwebb
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FOG

91xfi1.0
Aug 29 2009, 02:36 PM
Coche Blanco
Aug 29 2009, 02:21 PM
Posted Image

This may or may not be the right Dyno sheet of the 1.0, but I think it's right. I doubt it loses that much HP in 1k rpms.
Hi, I may be wrong. The horsepower stats I looked at were the one where they tested a singh grooved head. The bk hp at 2000 rpm was 6 hp for the stock head. Maybe I am reading this wrong. Here is the link for it-

http://www.herningg.com/singh/Engine%20Running%20Tests%20Analysis.pdf

You smarter guys out there can set the record straight for me. :)

for three different engines , one of which is a suzuki 993cc engine , apparently the 10g geo metro engine
- three different traces -

this graph show ftlbs (foot pounds)of torque (not horsepower) per engine rpm
Edited by mwebb, Aug 29 2009, 08:37 PM.
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Coche Blanco
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Troll Certified

Yeah I saw that, it's comparing for para gliders. I saw that it was ft/lbs but it was all I could find. That and 50lbs of torque at 2k isn't too bad.
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mwebb
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FOG


4th gear 3000 rpm
Posted Image

right click on image , from the menu select "veiw image" to expand image

from this table copied and pasted from the link
IF BK HP and CORR HP are "Brake Horsepower" and "Corrected Horsepower"

then this table shows horsepower and torque out put values are LOWER with the grove at a constant throttle opening NEAR 13%
it should be noted throttle opning is HIGHER on all recorded values for the NON grooved results which will skew HORSE Power and torque values UPward for those results , albeit very slightly .

efficiency is HIGHER across the board for the Grooved test results.

it should also be noted
these test results are NOT a measure Of potential MAXIMUM Horsepower OR engine torque at WOT and 100% Load and are NOT a comparison of those values either .

this shows results at a load simulating cruise , the grooved cylinder head is more efficient and will get better fuel economy
this also shows the engine is running rich at just under 14 to 1 AFR
in the real world at cruise the engine would be running at stoich , 14.7 to 1 AFR.
whether or not that will affect these test results is completely unknown to me
Edited by mwebb, Aug 29 2009, 09:54 PM.
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91xfi1.0


mwebb
Aug 29 2009, 09:18 PM

4th gear 3000 rpm
Posted Image

right click on image , from the menu select "veiw image" to expand image

from this table copied and pasted from the link
IF BK HP and CORR HP are "Brake Horsepower" and "Corrected Horsepower"

then this table shows horsepower and torque out put values are LOWER with the grove at a constant throttle opening NEAR 13%
it should be noted throttle opning is HIGHER on all recorded values for the NON grooved results which will skew HORSE Power and torque values UPward for those results , albeit very slightly .

efficiency is HIGHER across the board for the Grooved test results.

it should also be noted
these test results are NOT a measure Of potential MAXIMUM Horsepower OR engine torque at WOT and 100% Load and are NOT a comparison of those values either .

this shows results at a load simulating cruise , the grooved cylinder head is more efficient and will get better fuel economy
this also shows the engine is running rich at just under 14 to 1 AFR
in the real world at cruise the engine would be running at stoich , 14.7 to 1 AFR.
whether or not that will affect these test results is completely unknown to me
Oh, ok, I understand now. This test was not at WOT but at 38% throttle (assuming that is what the 38% in the chart means. Ok that clears it up.
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99metro
putt-putt

dimetrodon
Aug 28 2009, 09:48 PM
The engine is after all, only a 1.0 liter displacement. Most people with riding lawnmowers probably have larger engines.
I drove putt-putt to a class for 3 days. 200 mile round trip. A guy was there that had a 1300cc engine in his motorcycle...

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mwebb
Member Avatar
FOG

91xfi1.0
Aug 30 2009, 12:00 AM
mwebb
Aug 29 2009, 09:18 PM

4th gear 3000 rpm
Posted Image

right click on image , from the menu select "veiw image" to expand image

from this table copied and pasted from the link
IF BK HP and CORR HP are "Brake Horsepower" and "Corrected Horsepower"

then this table shows horsepower and torque out put values are LOWER with the grove at a constant throttle opening NEAR 13%
it should be noted throttle opning is HIGHER on all recorded values for the NON grooved results which will skew HORSE Power and torque values UPward for those results , albeit very slightly .

efficiency is HIGHER across the board for the Grooved test results.

it should also be noted
these test results are NOT a measure Of potential MAXIMUM Horsepower OR engine torque at WOT and 100% Load and are NOT a comparison of those values either .

this shows results at a load simulating cruise , the grooved cylinder head is more efficient and will get better fuel economy
this also shows the engine is running rich at just under 14 to 1 AFR
in the real world at cruise the engine would be running at stoich , 14.7 to 1 AFR.
whether or not that will affect these test results is completely unknown to me
Oh, ok, I understand now. This test was not at WOT but at 38% throttle (assuming that is what the 38% in the chart means. Ok that clears it up.
in the PDF link there is a description of the acronyms in the header columns
the throttle position sensor was showing around 13% throttle for the image i posted , in the TPS column ,

i chose that set of test results because it seemed to be the closest to cruise load , but others may have chosen another set of test results for their own reasons

so that set of test results was recorded at 13% throttle in 4th gear at 4000 rpm loaded up ( as described in the link ) with a large hydraulic pump .

the final column on the right would be the relative efficiency higher is better
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