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Rev · 10-04-2003, 05:28 PM

Has anyone else besides me done this? I welded in some fittings right behind the headers allowing 1/8" steel tubes about 6" long off of the head pipes. I then attatched flexible lines to the interior of the car and attatched a Vacuum guage that also showed positive pessure 0-10 psi.

At idle I got .5 psi and a max of 2.5-3.0 psi at 5500 RPM. The guage actually vacillated alot at that point making a definite reading improbable. I would say 2.75 psi @5500 RPM.

Anyone else ever done this? I think anything under 3.0 psi should be OK. Any comments / opinions welcome.

Rev

10-04-2003, 05:28 PM	#1
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Back pressure measurement? Has anyone else besides me done this? I welded in some fittings right behind the headers allowing 1/8" steel tubes about 6" long off of the head pipes. I then attatched flexible lines to the interior of the car and attatched a Vacuum guage that also showed positive pessure 0-10 psi. At idle I got .5 psi and a max of 2.5-3.0 psi at 5500 RPM. The guage actually vacillated alot at that point making a definite reading improbable. I would say 2.75 psi @5500 RPM. Anyone else ever done this? I think anything under 3.0 psi should be OK. Any comments / opinions welcome. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe