Any ways to increase vacuum signal?

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08-08-2019 | 11:46 AM

#11

Registered

Joined: Nov 2004

Posts: 14,152

Likes: 3,712

From: On A Dirt Floor

Quote:

Originally Posted by SS496

Adjust the idle mixture using the same method.....but in gear

x 2

08-08-2019 | 12:50 PM

#12

Griff

Charter Member # 55

Joined: Oct 2000

Posts: 20,272

Likes: 2,512

From: Omaha/LOTO

Quote:

Originally Posted by SS496

Adjust the idle mixture using the same method.....but in gear

With the boat tied off to the dock to simulate the load.

08-08-2019 | 01:26 PM

#13

fbc25el

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Joined: Feb 2005

Posts: 570

Likes: 47

From: cincinnati,oh.

Quote:

Originally Posted by bck

Running a Victor intake with a 1050 4500 and a 1 inch super sucker spacer on a 540. Vacuum signal at the carb is pretty weak at idle. Removing the spacer made a bit of an improvement but not enough. Maybe a 4 hole spacer might give the carb a better signal than no spacer? Any other ideas? Just trying to get the in gear idle a little better and not be overly rich to keep it running.

If your metering blocks have the idle feed restrictor " IFR " in the upper position the overlap from the cam cause a problem with the fuel flow. The IFR should be in the lower position. If you go to RACINGFUELSYSYEMS web site that pretty well explains it.