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10-21-2009, 09:07 PM
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#1 |
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Registered User
Join Date: Sep 2006
Location: Riverton KS
Posts: 832
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The best way to Generate more Vacuum?
I just got my CPP Booster and MC installed this afternoon, and finally completing my disc conversion.(had pics but cant get them to load) I knew I would probably be short on vacuum, but I'm really short. My motor only generates about 8-9 inches of vacuum.My question is, what has everyone with big cams used to generate vacuum? Is a vacuum canister enough, or do I need an electric pump. Any Input?
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1970 SWB Build |
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10-21-2009, 10:05 PM
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#2 |
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Registered User
Join Date: Jan 2008
Location: Post Falls, Idaho
Posts: 606
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Re: The best way to Generate more Vacuum?
a vacuum canister works for me.
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10-21-2009, 10:30 PM
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#3 |
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The oddest Todd around
Join Date: May 2004
Location: Miami, Florida
Posts: 1,418
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Re: The best way to Generate more Vacuum?
I said screw it... going slow (when vacuum is low), I'm not moving fast enough to really hurt, and I just push harder on the pedal.
At speed, you have enough vacuum to stop. But yeah... a canister, or a pump. You could also go to the hydromatic power brakes and not worry about vacuum.
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"The greatest pleasure is to vanquish your enemies and chase them before you, to rob them of their wealth and see those dear to them bathed in tears, to ride their horses and clasp to your bosom their wives and daughters." Ghengis Khan IIOY??? |
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10-21-2009, 10:36 PM
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#4 |
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Registered User
Join Date: May 2005
Location: PA
Posts: 2,696
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Re: The best way to Generate more Vacuum?
What are the engine specs? Timing? vacuum advance? Seems pretty low unless you've got a pretty huge cam
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10-21-2009, 10:55 PM
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#5 |
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Hittin E-Z Street on Mud Tires
 
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: The best way to Generate more Vacuum?
It's been a long time since I checked mine, but I thought my 350 was running at around 18-20 @ idle. I checked it 'cause I thought I had a leak, but I didn't. 8-9 seems really low to me. I will admit to NOT knowing a lot about engines though...
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride  American Born, Country by the Grace of God  1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 10-21-2009 at 10:56 PM. |
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10-21-2009, 11:04 PM
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#6 |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: The best way to Generate more Vacuum?
Condition of the engine has an affect on vacuum also. If it's old and long in the tooth, it may need some valve or ring work.
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10-21-2009, 11:07 PM
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#7 |
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Senior Member
Join Date: Jan 2005
Location: Raleigh, NC
Posts: 894
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Re: The best way to Generate more Vacuum?
My brother runs a dual-diaphragm booster and uses a vacuum accumulator on his 502BB Chevelle.
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-Chris Building a stripper, one part at a time: 1969 K5, 307, 3spd, 3 seats, hard top. Added Pwr Discs, Pwr Steering, Aux Battery, T-case Skid, Lighted Sidemarkers, HEI, Lock-Right Diff, ECE Class IV Hitch, 32" MT/Rs. Parts to Install: Hand Throttle, Console, Tow Hooks, Dual Horns, AM-FM, Dealer Swing-Away Tire Carrier, Gas Tank Skid. Also building a 1950 Willys CJ-3A and off-roading a 2001 Nissan Frontier on 1-Ton Portals... |
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10-21-2009, 11:38 PM
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#8 | |
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Account Suspended
Join Date: Apr 2009
Location: Oklahoma City
Posts: 4,709
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Re: The best way to Generate more Vacuum?
Quote:
Last edited by highperf4x4; 10-21-2009 at 11:39 PM. |
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10-22-2009, 02:58 AM
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#9 |
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Registered User
Join Date: Apr 2001
Location: jefferson city, mo
Posts: 1,364
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Re: The best way to Generate more Vacuum?
hydroboost all the way, it will stand y our truck on its nose. Its what i did after spending a bunch of money trying to fix it cheap. http://www.hydratechbraking.com/Hydr...D926717302BC91
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