Blown Holley power valve.
Thread Starter
Melting Slicks
Joined: Oct 2005
Posts: 2,056
Likes: 8
From: Redruth Cornwall
Blown Holley power valve.
Am reading up on carbs and the fuel system at the moment. Whilst reading a few other posts, a blown power valve was mentioned with Holley carbs. Seems like these are prone to failing if you have a back fire through the carb.
My question is what are the symptoms of a blown power valve and is there a check/test to prove if its ok or not.
TIA, learning all the time.
My question is what are the symptoms of a blown power valve and is there a check/test to prove if its ok or not.
TIA, learning all the time.
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Originally Posted by GDaina
poor performance with blown power valve, flooding.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Take your finger and hold it over the vent tube on the primary side. If it floods out right away the PV is blown. Due the same in the rear if you have 2 PVs. This has worked for me countless times and is very easy to do. If the car does not flood out check elsewhere. You will actually see the fuel being pulled in if you look down the throat while you are doing this.
