Re: Pressure check a Hemi or whatever block
[Re: hemi-itis]
#2454967
02/21/18 05:32 AM
02/21/18 05:32 AM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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Engine in car or bare block on the stand? Your choice, it will, or should test the same either way Probably easier on the stand so you can look at the back, sides and front of the motor on the stand
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Pressure check a Hemi or whatever block
[Re: cudaman1969]
#2454969
02/21/18 05:35 AM
02/21/18 05:35 AM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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You can bolt it together with the heads and put a pressure inlet port and gauge on block plates on the water pump inlet and outlets(both sides) and apply air pressure and get a spray bottle of soapy water and go searching all over the heads and block I've used a torque plate to pressure check aluminum heads that had been welded on, that works also So you use air instead of water? At what pressure? Would an engine "see" 20# or more pressure running? I don't use water in the block or heads Air pressure and soapy water, on the aluminum heads that had cracks and had been welded on already I used 30+ Lbs. of air pressure to make sure they where sealed up after having those welds welded up over again
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Pressure check a Hemi or whatever block
[Re: cudaman1969]
#2455050
02/21/18 01:09 PM
02/21/18 01:09 PM
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Joined: Aug 2009
Posts: 304 Portland, Oregon
Digger73
enthusiast
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enthusiast
Joined: Aug 2009
Posts: 304
Portland, Oregon
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Not to get off subject but, how long should the pressure hold in the system without any loss?
Digger73 (Mike(
I live with fear everyday but, sometimes she lets me race!
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Re: Pressure check a Hemi or whatever block
[Re: cudaman1969]
#2455060
02/21/18 01:35 PM
02/21/18 01:35 PM
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Joined: Jan 2003
Posts: 13,363 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,363
Marion, South Carolina [><]
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Unless the leak/crack/hole is really bad, a cast iron block or cylinder head will most likely not show a leak unless you can heat it up. Pressure checking one cold and it not showing any leakage doesn't prove anything.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Pressure check a Hemi or whatever block
[Re: an8sec70cuda]
#2455063
02/21/18 01:42 PM
02/21/18 01:42 PM
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Joined: May 2011
Posts: 4,489 northern,Ohio,USA
Clanton
master
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master
Joined: May 2011
Posts: 4,489
northern,Ohio,USA
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Unless the leak/crack/hole is really bad, a cast iron block or cylinder head will most likely not show a leak unless you can heat it up. Pressure checking one cold and it not showing any leakage doesn't prove anything. There have been posts with heat coils going into the block moving hot water.I pre heated the block,put in hot water then seald and continued heating it
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Re: Pressure check a Hemi or whatever block
[Re: cudaman1969]
#2455172
02/21/18 05:24 PM
02/21/18 05:24 PM
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Joined: Oct 2005
Posts: 8,871 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,871
Ontario, Canada
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Not to get off subject but, how long should the pressure hold in the system without any loss? Uh, forever. Anything less would be a leak, right ?!?!?
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Re: Pressure check a Hemi or whatever block
[Re: hemi-itis]
#2455216
02/21/18 06:54 PM
02/21/18 06:54 PM
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Joined: Jan 2004
Posts: 8,251 fredericksburg,va
cudaman1969
OP
master
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OP
master
Joined: Jan 2004
Posts: 8,251
fredericksburg,va
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Engine in car or bare block on the stand? On a stand, bare block. I was going to make a head plate of 1/4 aluminum but the kit said without a head it needed a torque plate.? I figured 40 psi would show any cracks, no mater how hot it is. But that's why I'm asking.
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Re: Pressure check a Hemi or whatever block
[Re: cudaman1969]
#2455218
02/21/18 07:02 PM
02/21/18 07:02 PM
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Joined: Jan 2003
Posts: 13,363 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,363
Marion, South Carolina [><]
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The pressure test rack I used at the machine shop would go to 35 psi (IIRC) and it wouldn't make a crack bubble on a cold cast iron head...one we knew was leaking on the car.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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