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05-11-2005, 07:39 PM
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#1 |
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Import Slayer
Join Date: May 1999
Posts: 2,241
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vacuum readings
Tonight I hooked up a vacuum gauge on my engine.
When the car was at operating temp, the needle bounced between 14-15. I know the needle should be steady but what does the bouncing indicate? What other tests can I do with the vacuum gauge that will tell me different things about my engine? FIW, my cam specs are 274*/284* .519/.523 lift 110 LSA
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'82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator. |
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05-11-2005, 08:43 PM
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#2 |
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Registered Member
Join Date: Apr 2001
Location: Staging lane
Posts: 4,337
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Re: vacuum readings
Lopey idle equals bouncing needle. Mine does the same thing.
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer |
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05-12-2005, 03:35 AM
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#3 | |
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cranky old man
Join Date: Sep 2001
Location: Longview Texas
Posts: 683
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Re: vacuum readings
Quote:
Rod
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Under Construction: 64 Falcon 372 cu in. stroker 1:72 rod ratio 6.250" rods (long rod), Comp Cams XE274 230/236 520/526 @ .050, Scorpion Rollers, Roush 200 irons, 10:1 Keith Blacks, Hedman long tubes, 750 Holley DP, Edelbrock Victor Jr., C4 3500 stall, gears and tires to be anounced. |
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05-12-2005, 02:09 PM
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#4 |
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Registered Member
Join Date: Nov 1998
Location: Houston, Tx.
Posts: 3,887
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Re: vacuum readings
I'm surprised you can get 14-15 with that cam. With my 268/274 I get about 10 in. HG at 700 rpm idle.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe |
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