Anyone know what this is?
Stampings 12 & C-8
Strange power valve
Moderator: Team
Strange power valve
You do not have the required permissions to view the files attached to this post.
- mt-engines
- Expert
- Posts: 857
- Joined: Fri Sep 27, 2019 12:35 pm
- Location: MN
-
- Guru
- Posts: 4584
- Joined: Sun Sep 18, 2011 11:31 am
- Location: Heading for a bang up with Andromeda as we all are.
Re: Strange power valve
I would not trust those 2 stage valve for long in performance usage !
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
-
- Guru
- Posts: 1938
- Joined: Tue Sep 15, 2015 2:25 pm
- Location:
Re: Strange power valve
yep two stage power valves, have not seen one for a long time, back in the late 70's I worked at a Chevy dealer, back then the dump trucks still had gas engines, 366 and 427 big blocks. Used to overhaul a lot of the dump truck holly carbs with a governor, and they all had two stage power valves similar to those in the pictures.
-
- Guru
- Posts: 1264
- Joined: Fri Feb 26, 2010 11:15 am
- Location: Gold Canyon, AZ
Re: Strange power valve
The Holley two-stage power valve was also supposed to be able to withstand diaphram damage due to backfire much better than the original design power valve. Not sure if they are successful in this or not, BUT the two stage PV is not suitable for high performance applications.
Bill
Perfect Circle Doctor of Motors certification
SAE Member (30 years)
ASE Master Certified Engine Machinist (+ two otherASE Master Certifications)
AERA Certified Professional Engine Machinist
Perfect Circle Doctor of Motors certification
SAE Member (30 years)
ASE Master Certified Engine Machinist (+ two otherASE Master Certifications)
AERA Certified Professional Engine Machinist
-
- Guru
- Posts: 6353
- Joined: Tue Jul 24, 2012 11:15 am
- Location: Roseville, Michigan (just north of Detroit)
- Contact:
Re: Strange power valve
2 stage power valve would not blow-out as easy however, when wide open could not pass enough fuel to supply more than 2/.062" PVCR's.
The first stage would open at about a drop to 10 to 12 inches of vacuum and supply about only 2 jet sizes of extra fuel so mileage could increase and emissions would be less on the road because using slightly leaner main jets were possible.
The first stage would open at about a drop to 10 to 12 inches of vacuum and supply about only 2 jet sizes of extra fuel so mileage could increase and emissions would be less on the road because using slightly leaner main jets were possible.
http://www.rmcompetition.com
Specialty engine building at its finest.
Specialty engine building at its finest.