Inspection Questions
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Post Fiend
Joined: Jul 2005
Posts: 8,462
Likes: 4
From: Durant, OK (SOSU)
Inspection Questions
Ok two questions. First of all I passed no problem, just curiosity made me wonder.
It lists GVW as 2250, I KNOW the Rangers weigh more than that, right?
Low Speed: 15 MPH
RPM: 1286
HC 89
CO .49
CO2 14.2
O2 .6
NOx 616
Dilution 14.7
High Speed: 25 MPH
RPM: 2141
HC 27
CO .15
CO2 14.9
O2 .2
NOx 227
Dilution 15.1
Why is everything lower at 25 MPH? Higher speeds, higher RPMs, seems like the engine would be emitting more of everything. But the only number that went up was CO2 (dilution is bigger=better, so I consider the numeral rising as the value falling). So...why?
RP
Zach
It lists GVW as 2250, I KNOW the Rangers weigh more than that, right?
Low Speed: 15 MPH
RPM: 1286
HC 89
CO .49
CO2 14.2
O2 .6
NOx 616
Dilution 14.7
High Speed: 25 MPH
RPM: 2141
HC 27
CO .15
CO2 14.9
O2 .2
NOx 227
Dilution 15.1
Why is everything lower at 25 MPH? Higher speeds, higher RPMs, seems like the engine would be emitting more of everything. But the only number that went up was CO2 (dilution is bigger=better, so I consider the numeral rising as the value falling). So...why?
RP
Zach
Posting Guru
Joined: Jul 2003
Posts: 1,978
Likes: 1
From: Alvin, Texas.
The engine is in it's powerband (or closer to it) at 25 mph than at 15 in any gear, I believe.
As for the GVWR, that has to be a fudge. I believe mine from the recent inspection was more like 4250...3250 weight plus 1000 lb's payload capacity, I guess.
As for the GVWR, that has to be a fudge. I believe mine from the recent inspection was more like 4250...3250 weight plus 1000 lb's payload capacity, I guess.
Fleet Mechanic
Joined: Dec 2003
Posts: 1,436
Likes: 117
From: Virginia
Also, keep in mind that converters need heat to activate the catalyst material. This is why they are placed some what close to the engine. If they were back by the bed, it would hardly do anything. I guess my point is, at higher RPMs your exhaust temp is higher too.
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