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#1 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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vacuum guage install
I am installing a vacuum guage and have to splice into one of my vacuum hoses, was thinking of putting a tee conector in the hose that goes to the tranny? I think it would be the best place.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#2 |
State of Confusion!
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Re: vacuum guage install
Mine have always been teed off the distributor connection, but not sure what the difference is. I have not used one in a long time except for tuneups.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#3 |
Registered User
Join Date: Sep 2002
Location: Clover, SC
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Re: vacuum guage install
I recently did this as well, I connected a t-fitting into the vacuum line that runs from the distributor to the carburator. Works great in my application, using an auto meter vacuum gauge
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#4 |
Oilfield Trash
Join Date: Sep 2003
Location: Raymore, Sk, Canada, Earth
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Re: vacuum guage install
Anyone know where the factory gauge was hooked up to?
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14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr. |
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#5 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
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Re: vacuum guage install
I assume you guys are running your advance on the full vacuum port on carb and not the ported one otherwise you would get no reading at idle.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#6 |
Registered User
Join Date: Sep 2002
Location: Clover, SC
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Re: vacuum guage install
Yes, you will know you have the correct vacuum by pulling off the hose to the distributor leading to the carb, motor will run sluggish.
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#7 |
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Re: vacuum guage install
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#8 |
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Re: vacuum guage install
Well that is debatable, I for one love it on full vacuum, some will disagree many will not.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#9 |
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Join Date: Sep 2005
Location: Monroe, WA
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Re: vacuum guage install
Generally, a completely stock engine is fine with ported vacuum. If it's been warmed over at all, the slight vacuum advance at idle from the non-ported (manifold) vacuum will improve the idle quality and off-idle response.
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#10 |
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Re: vacuum guage install
But typically you don't want vacuum at idle pulling advance into your initial right? Once you crack the primaries you expose the other vacuum port and that is the one that's supposed to go to the dist.
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#11 | |
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Re: vacuum guage install
Quote:
![]() The "supposed to's" pretty much go out the window once you start re-engineering (i.e. adding horsepower to) the design. |
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#12 |
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Join Date: Dec 2006
Location: Rolla, MO
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Re: vacuum guage install
What's the benefit of using a vacuum gauge?
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-Scott- |
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#13 |
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Re: vacuum guage install
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#14 |
State of Confusion!
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Re: vacuum guage install
You can educate your foot for better gas mileage for one!
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#15 |
Senior Member
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Re: vacuum guage install
HA!
You're right!!! It's fun to watch the gauge change! Seriously it helped me tune when I was having air/fuel problems. It's nice to have the gauge inside to see where your vacuum is when the weather changes and affects your idle. And, yes it does fill that empty gauge hole ![]() |
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#16 |
sufficiently talented fool
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Re: vacuum guage install
Cuz it's COOL!!!!!!!!!!!!!!!!!!!!!!
and it fills the empty hole...
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#17 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
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Re: vacuum guage install
And if you have a vacuum leak it makes it easier to spot (plus the needle dances when the motor goes vrooom)
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#18 |
Msgt USAF Ret
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Re: vacuum guage install
Here's a good read on vacuum if you're interested.
http://www.lbfun.com/Corvette/Tech/v..._explained.pdf
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#19 |
The Original HotRod KnifeMaker
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Re: vacuum guage install
I doubt anyone but another owner will ever notice that the one gauge hole doesn't have anything behind it- but I am doing mine, too, to fill the hole I know is there
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Dave 69 GMC SWB 2WD 454 Turbo 400 |
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#20 |
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Re: vacuum guage install
The vacuum gauge was only 'stock' on the larger (C-50 and 60) trucks with vacuum brakes. The gauge read vacuum in the vacuum tank under the cab. I think the best place to hook it to is manifold vacuum.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90. |
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#21 |
The Original HotRod KnifeMaker
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Re: vacuum guage install
So what else did you have to do to get the vaccum gauge installed and working?
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Dave 69 GMC SWB 2WD 454 Turbo 400 |
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#22 |
Registered User
Join Date: Feb 2004
Location: Tacoma WA
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Re: vacuum guage install
I believe the "stock" hook-up was made to the fitting in the intake manifold behind the carb. Not to the carb at all but to the manifold. The fitting also serves the brake booster and transmission(IIRC)
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67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow |
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#23 |
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Re: vacuum guage install
My vacuum gauge is run to a small tap in the intake manifold with 1/8" copper line. Cleaner signal and you don't have to disconnect it every time you pull the carb.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 06-13-2007 at 08:02 AM. |
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#24 |
Senior Member
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Location: Colfax-California
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Re: vacuum guage install
Last year I found a dash with a pressure guage in the hole. I still have it packed in a box somewhere.
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