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Big block intake pan gasket
#139462
10/20/08 11:58 PM
10/20/08 11:58 PM
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Joined: Oct 2004
Posts: 16,478
Canada
CrAzYMoPaRGuY
OP
I Live Here
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OP
I Live Here
Joined: Oct 2004
Posts: 16,478
Canada
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Has anybody ever had the valley pan on a big block "balloon" if the fiberglassish material pad isn't installed- plugged PCV or?
I've seen quite a few back in the day, I just wonder if it was excess blowby, a plugged PCV, or? Was it common, or did I just see a few more than most...?
CrAzYMoPaRGuY
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Re: Big block intake pan gasket
[Re: CrAzYMoPaRGuY]
#139463
10/21/08 12:56 AM
10/21/08 12:56 AM
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Joined: Jan 2003
Posts: 3,031
Erda, UT
67Charger
master
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master
Joined: Jan 2003
Posts: 3,031
Erda, UT
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I had that happen when I had a clogged breather...
11.33 @ 118.46 on motor
10.75 @ 125.35 w/ a little spray
Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race
Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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Re: Big block intake pan gasket
[Re: CrAzYMoPaRGuY]
#139464
10/21/08 06:13 AM
10/21/08 06:13 AM
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Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni
pro stock
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pro stock
Joined: Jul 2007
Posts: 1,526
North Carolina
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Quote:
Has anybody ever had the valley pan on a big block "balloon" if the fiberglassish material pad isn't installed- plugged PCV or?
I've seen quite a few back in the day, I just wonder if it was excess blowby, a plugged PCV, or? Was it common, or did I just see a few more than most...?
It has nothing to do with the pad under the intake. The valley van will ballon if you don't have some type of breather/PCV valve.
I had this happen the first day I broke my engine in. In my excitement, I forgot to install a PCV, and with all the blowby of a newly-rebuilt motor, it popped that valley pan like a piece of popcorn!
When, it happened, I'd thought I thrown a pushrod or something  ...sounded like a gunshot!
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Re: Big block intake pan gasket
[Re: CrAzYMoPaRGuY]
#139465
10/21/08 09:09 AM
10/21/08 09:09 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
Has anybody ever had the valley pan on a big block "balloon" if the fiberglassish material pad isn't installed- plugged PCV or?
I've seen quite a few back in the day, I just wonder if it was excess blowby, a plugged PCV, or? Was it common, or did I just see a few more than most...?
To BALLOON up a valley pan ..... is way WAY more than just a plugged-up PCV ..... there are MAJOR piston or piston ring probs going on. The last one I saw was a MH 440 that a guy had gotten out of a JY. The VP was almost "molded" to the bottom of the intake. There was a hole in one of the pistons the size of a quarter !
A plugged-up PCV ? ... you CrAzY CaNaDiAnS ! 
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Re: Big block intake pan gasket
[Re: R/T1968R/T]
#139468
10/21/08 04:14 PM
10/21/08 04:14 PM
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Joined: Jan 2003
Posts: 21,065
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,065
Niles , Ohio
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I dont know we run no PCVs on 3 motors 1 SB and 2 BBs.My 12.5 440 has 2 breathers and is new under 5K miles but is street and strip.The kids almost 50 year old 413 ses tons of satreet miles and has never been apart.2 breathers on it too.He runs the snot out of it and has for 9 years.If you balloon a valley pan you need a rebuild period.If its a new motor and does it you have problems.Rocky
Chrysler Firepower
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Re: Big block intake pan gasket
[Re: 1970440RT]
#139470
10/21/08 05:56 PM
10/21/08 05:56 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
My motor did it when new. I forgot the pcv and breather when breaking it in. Not only ballooned valley, also leaking gaskets. I replaced the pan and added a breather. 6 years later the same motor is still running strong.
Well - how you define "running strong" is way diff than mine. If you have enough pressure to "inflate" the VP gasket ..... your motor is a leaker- big-time. And piston-ring-seal is probably the most important factor of a good running internal combustion engine.
To the guy who had the stuck-floats and the oil was diluted with gas .... you probably hurt the rings badly. It is a well-known-fact that you can damage the rings with an excessively rich A/F mixture. What happens is that rich-mixture "washes" the oil off the rings and cyl walls. NOT good.
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Re: Big block intake pan gasket
[Re: CrAzYMoPaRGuY]
#139473
10/21/08 10:36 PM
10/21/08 10:36 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
I think you would be surprised how a good running engine WITHOUT a breather or PCV valve can pop a valley pan gasket.
Regular blowby running at highway speeds, I've seen it.
I'm not sure your motorhome could make it up to such speeds, being fiberglass and all.
Mind you- MY motorhome was a STEEL shell, and could SUSTAIN "highway speeds"....
You CrAzY cAnAdIaNs ! ... 
BLOWby equals lost power ! ....and fuel econ.
And as far as fiberglass vs steel ? ....with your AERO equal to a barn-door ...and mine same-same to the Space-Shuttle ...we will see who will do what .... at a 100 mph "roll" !
 .....  ..... 
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Re: Big block intake pan gasket
[Re: stumpy]
#139479
10/21/08 11:02 PM
10/21/08 11:02 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
Please read the above posts and you will find the other opinions on different causes.
I was asking YOU your opinion.
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Re: Big block intake pan gasket
[Re: NITROUSN]
#139480
10/21/08 11:14 PM
10/21/08 11:14 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
The motor needs to be vented or where else does the pressure go? Seems like the dipstick should lift up. I wonder how much pressure it takes to belly a pan? Maybe some pans are thinner and belly easier.
Good points ..... and all engines have some degree of less than 100% ring-seal.
How much pressure would it take? ...I would think it would be EVERY BIT of the compression and ignition process of one cylinder !!
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Re: Big block intake pan gasket
[Re: CrAzYMoPaRGuY]
#139482
10/21/08 11:26 PM
10/21/08 11:26 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
ALL engines have blowby.
Fiberglass vs steel? STEEL WINS!
Here's MY 100 mph "roll on"... let's see yours!
Yes indeed .... blowby is just a fact of life ... but CaNaDiAnS are so much better at it than all-us are ! ...as is shown in that pic of yeerrs! ...or is that your holding-tank afire ?
Steel wins ? ... you are pSyChO - EXIT that MH now ...and get some fresh air !
You have seen the pic of mine ....and I give-up .... YoU wIn - you DO have more blow-by than me !
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Re: Big block intake pan gasket
[Re: CrAzYMoPaRGuY]
#139484
10/22/08 06:25 AM
10/22/08 06:25 AM
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Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni
pro stock
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pro stock
Joined: Jul 2007
Posts: 1,526
North Carolina
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Quote:
Quote:
Quote:
My motor did it when new. I forgot the pcv and breather when breaking it in. Not only ballooned valley, also leaking gaskets. I replaced the pan and added a breather. 6 years later the same motor is still running strong.
Well - how you define "running strong" is way diff than mine. If you have enough pressure to "inflate" the VP gasket ..... your motor is a leaker- big-time. And piston-ring-seal is probably the most important factor of a good running internal combustion engine.
To the guy who had the stuck-floats and the oil was diluted with gas .... you probably hurt the rings badly. It is a well-known-fact that you can damage the rings with an excessively rich A/F mixture. What happens is that rich-mixture "washes" the oil off the rings and cyl walls. NOT good.
I think you would be surprised how a good running engine WITHOUT a breather or PCV valve can pop a valley pan gasket.
Regular blowby running at highway speeds, I've seen it.
There was nothing wrong with my motor when it ballooned the valley pan. IF you think it would pop up the dipstick think of how much surface area a dipstick has to "push" on as opposed to a valley pan. It makes perfect sense a valley pan would balloon before your dipstick "rocketed" out! Pressure is force/area so since the pressure is about constant per unit area, the total force would be orders of magnitude greater on a valley pan than a dipstick.
There is also something to be said about when an engine is FIRST cranked that it has a break-in period where it will seat the rings. Blow-by is lost horsepower but from what I have gathered, after about 30 minutes of running the engine at 3000 RPM, the problem subsided. To bad within that time, I had NO BREATHER OR PCV and ballooned the pan after about 20 minutes. After adding that, everything has been totally normal. ANY motor with out any type of venting will build up pressure and eventually balloon/blow something. BTW, nothing else was damaged on my motor. Just loosened up the oil cap for a sec to let the gas escape...
I posted exactly what happened in this case up here around a year ago and nobody had anything bad to say about it then...
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