Tegger's 'Teg passes another emissions test!

At hot idle (when the cat is actually functioning) that initial elevated
RPM lasts for only two seconds or so, just long enough to get the oil
pressure up quickly. I'm really surprised they'd try to test you on such a
short duration.

AFAIK, no North American jurisdiction attempts such a thing.

 

OK thought I'd check this out properly as I wasn't sure of my facts. Turns
out I was wrong - according to the MOT manual at:
http://www.motuk.co.uk/manual_730.htm

"fast idle test: Raise the engine speed to a fast idle between 2500 and
3000rpm and hold steady. Note the readings for CO, HC and lambda, and record
the results."

So it's a held fast idle.

Al

 

OK thought I'd check this out properly as I wasn't sure of my facts. Turns
out I was wrong - according to the MOT manual at:
http://www.motuk.co.uk/manual_730.htm

"fast idle test: Raise the engine speed to a fast idle between 2500 and
3000rpm and hold steady. Note the readings for CO, HC and lambda, and record
the results."

So it's a held fast idle.

Al

 

That's not "idle" by /any/ stretch. I think their terminology is a bit
suspect. It actually sounds like a no-load test at cruising RPM's, which is
probably being done in lieu of a dyno test. Maybe your MoT dynos are not
set up for emissions testing.

A typical North American off-idle test is the ASM2525, which uses a dyno to
impose a 25% load on the engine at a speedometer reading of 25mph.

 

That's not "idle" by /any/ stretch. I think their terminology is a bit
suspect. It actually sounds like a no-load test at cruising RPM's, which is
probably being done in lieu of a dyno test. Maybe your MoT dynos are not
set up for emissions testing.

A typical North American off-idle test is the ASM2525, which uses a dyno to
impose a 25% load on the engine at a speedometer reading of 25mph.