Been trying to mount the AFM in my twin-plenum RV8 Viento. Am I right in thinking that the pipe run from AFM to plenum should be as short as
possible? I tucked the AFM round the back of the engine with longer pipes to the plenum last night and it then ran really badly. I didn't have
a chance to play much more, but just want to check I haven't knackered the AFM is knocking it about etc. I'm guessing that when the AFM is
metering the air, with longer pipes it doesn't know what's already in the pipe and so the engine will run lean until it all catches up -
make sense?
Cheers
Is it a flapper or Hotwire ?
Hotwire can get confused with iregular flow from bends and corners. dont know about the flapper type.
another thing to check with hotwire are you running labda sensors ? and was your loom / ecu from a car that would have had these fitted
another thing for bothe systems is to ensure that you have NO air leaks.
regards
Agriv8
flapper or hotwire both need approx the right volume of air between them and the throttles to combat pulsing which the engine sees as airflow but its actually going backwards.
Thanks guys.
It's a flapper type.
Everything was running fine when I had the standard pipes etc fitted, it's just I'd need a big hole in the bonnet with the parts sticking
out! I'm sure that the problem does relate to pipe length etc, was just looking for confirmation that my logic was right. I'm also hoping
that I haven't developed a fault with the AFM itself.
Theoretically, you can use longer pipes as long as you drop the diameter to give the same volume..........
not sure I'd want to try it though, might restrict it or cause some other trouble, plus cost lots of pipe if it doesn't work!
I agree, I was always intending to use short lenghts of pipe, but need to fabricate mounts for the AFM etc. To try and get the car to Stoneleigh, I was trying to jury-rig it all in place around the back of the engine - guess it ain't gonna work there!
quote:
Originally posted by dsapsfo1
.......it's just I'd need a big hole in the bonnet with the parts sticking out!
. True, but I don't want to mess around with the standard twin-plenum set up that came out the factory. Cheers..
You can add a bit of pipe without any real issues, its the volumn of air that is flowing so you just delay the responce slightly, you will not notice
this.
Looking very smart Simon, Whooosshhhh
Mark, the problem isn't the delay so much as the pulsing. You get intake pulses and the volume is designed to minimise the effect these pulses have on the flap, if you get it wrong the flap waggles about on idle and cocks the job up.
quote:
Originally posted by mark chandler
Looking very smart Simon, Whooosshhhh
