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Bosch Idle Air Regulator adjustment?
Posted: Sun Jul 09, 2006 12:29 pm
by PSIG
I will be using the Bosch valve for cold start air in the next project and wondered if anyone knows how to adjust them for cold airflow? I used one in the past but just fabbed a pinch valve to control the fast idle speed. The one I just got flows much less air - maybe not enough. Anyone?
Thanks!
David
Posted: Mon Jul 10, 2006 7:20 pm
by PSIG
Well, I was hesitant to twist the electrical connector, but it appears to be the way to adjust the airflow. It went from 'closed' to nearly wide open within about 90° of rotation. From 2/3 open at about 70° it took about 4 minutes to fully close drawing 210mA at 14v. That's slower than when it gets heat on the engine. 2/3 open is a huge amount of air but it seems to work on the bench for testing purposes.
FWIW
Posted: Mon Jul 10, 2006 8:05 pm
by cmonref
Look here (watch wordwrap):
http://forums.pelicanparts.com/showthre ... hlight=WUR
This is a thread on the Pelican Parts BBS featuring a modification to an AAR to change the warmup time duration. The author rewires the heating element of the AAR. The thread has several pictures that may assist you in determining how to change the amount of air being passed.
The AAR featured in this thread is a different type than the one shown in the B&G AAR picture. I think -- not sure -- that the B&G-type cannot be opened as easily as the one in the Pelican thread.
Posted: Tue Jul 11, 2006 7:49 am
by PSIG
cmonref - thanks for the link. That's a different type for sure, but I'll keep an eye out for them. The Porsche guys must pay a handsome ransom for them
Thanks again for the ref!
David
Posted: Tue Jul 11, 2006 8:07 am
by woh
I just used a file to enlarge the valve in the gap when open.
Make sure that you put it in the proper direction. If put in backwards it leaks during hot running idle.
Alternate to Bosch aux. air valve
Posted: Thu Aug 10, 2006 7:41 am
by matsalleh76
Early Japanese EFI engines used a Japanese version of the Bosch AA valve. It has a black plastic end peice that is removable (four screws)exposing the valve disc and the bi-metal element that can be twisted in the appropriate direction to increase or decrease opening.
It is worth noting that the engine radiant heat has more effect on these things than the electric element. The electric element will do the initial closing, engine heat then takes over up to final closing.
Regards,
bobf.[/img]
Alternate to Bosch aux. air valve
Posted: Thu Aug 10, 2006 7:42 am
by matsalleh76
Early Japanese EFI engines used a Japanese version of the Bosch AA valve. It has a black plastic end peice that is removable (four screws)exposing the valve disc and the bi-metal element that can be twisted in the appropriate direction to increase or decrease opening.
It is worth noting that the engine radiant heat has more effect on these things than the electric element. The electric element will do the initial closing, engine heat then takes over up to final closing.
Regards,
bobf.[/img]