Power Valve?
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Joined: Aug 2004
Posts: 80
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From: Okeechobee Florida
Power Valve?
Anyone know what size power valve to put into a 427/435 (2300) carb.
I went through the hassle to replace the one I had with a power valve I had sitting around. when I pulled it out the power valve had no numbers on it. Now the car runs crappy. Idles fine, but when moving it feels like its missing real bad. almost like the other two carbs are not even there. Timing is good. All fuel bowls are good (needle and seats). Is it the power vavle?
I went through the hassle to replace the one I had with a power valve I had sitting around. when I pulled it out the power valve had no numbers on it. Now the car runs crappy. Idles fine, but when moving it feels like its missing real bad. almost like the other two carbs are not even there. Timing is good. All fuel bowls are good (needle and seats). Is it the power vavle?
Heel & Toe
Joined: Nov 2006
Posts: 17
Likes: 0
Hi,
Are you sure the powervalve you put in is good? Check for a ruptured diaphram. This can be done with a Mighty vac or just suck on the flat side making a seal with your mouth and see that the plunger pulls in and seals as long as you keep suction on it (Not too hard).
You can install the correct one by running the car at idle in drive, foot on brake and check vacuum reading with gauge hooked up (May need (2) people for this. The power valve needed should be: Vacuum reading minus 2.
If your reading is 8.5 in drive, you should install a 6.5 P.V.
Hope this helps and good luck.
Are you sure the powervalve you put in is good? Check for a ruptured diaphram. This can be done with a Mighty vac or just suck on the flat side making a seal with your mouth and see that the plunger pulls in and seals as long as you keep suction on it (Not too hard).
You can install the correct one by running the car at idle in drive, foot on brake and check vacuum reading with gauge hooked up (May need (2) people for this. The power valve needed should be: Vacuum reading minus 2.
If your reading is 8.5 in drive, you should install a 6.5 P.V.
Hope this helps and good luck.
Heel & Toe
Joined: Nov 2006
Posts: 17
Likes: 0
I have read that you divide the reading by 2 also. But I recently read the method that I just posted on a Drag racing forum that I belong to, but maybe it was incorrect.
Sorry for the mis-information and thanks for the correction.
Greg.
Sorry for the mis-information and thanks for the correction.
Greg.
