Re: another broken valley pan!!
[Re: hornetnut]
#1473795
07/25/13 02:21 AM
07/25/13 02:21 AM
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Joined: Mar 2003
Posts: 9,100 Rogue River, OR
Jeremiah
master
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master
Joined: Mar 2003
Posts: 9,100
Rogue River, OR
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Quote:
i know theres probably lots of threads for this, but i went through 25 pages before i gave up.. i broke another valley pan last weekend, right down the middle, again!!.. so ive been told i need to switch to an evacuation system, i found on at summit for 38 bucks and was wondering if you guys have any dos or donts for me when installing it..
i have been running a pcv on one side and a breather on the other and everytime i run at the track i break a valley pan and im really tired of it...
Power adder combo? What are the ring gaps set at?
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Re: another broken valley pan!!
[Re: rebel]
#1473796
07/25/13 02:30 AM
07/25/13 02:30 AM
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Joined: Feb 2011
Posts: 76 california
hornetnut
OP
member
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OP
member
Joined: Feb 2011
Posts: 76
california
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i dont have a way to post pics but i guess i should elaborate a bit, its a 67 440 with eddy perf rpm heads, milled down to 79cc's port matched and a perf rpm intake, 030 over bore with forged pistons, steel crank and rods, old ultradyne solid cam, all packed in a 74 amc hornet hatchback, now the first time i really stood on it it pushed the dipstick out a lil and pushed oil out on the header, so i figured at the time i must have over revved it, i went racing shortly after and it got really bad at the track and i noticed when i got it home that the valley pan was cracked, after some research i figured out that i had too much crankcase pressure and replaced the pan and added a breather to the opposite valve cover, i drove it in town for a while and thought i had it fixed, went racing again and it doesnt push the dipstick out anymore but it still cracked the valley pan
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Re: another broken valley pan!!
[Re: hornetnut]
#1473798
07/25/13 09:21 AM
07/25/13 09:21 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
i dont have a way to post pics but i guess i should elaborate a bit, its a 67 440 with eddy perf rpm heads, milled down to 79cc's port matched and a perf rpm intake, 030 over bore with forged pistons, steel crank and rods, old ultradyne solid cam, all packed in a 74 amc hornet hatchback, now the first time i really stood on it it pushed the dipstick out a lil and pushed oil out on the header, so i figured at the time i must have over revved it, i went racing shortly after and it got really bad at the track and i noticed when i got it home that the valley pan was cracked, after some research i figured out that i had too much crankcase pressure and replaced the pan and added a breather to the opposite valve cover, i drove it in town for a while and thought i had it fixed, went racing again and it doesnt push the dipstick out anymore but it still cracked the valley pan
You still have way to much crankcase pressure... you need to watch some of those breather caps.. the port in the cap(the hole) on some is actually restricted alot with the stuffing in them... I had a pair of Summit ones that I had to bend open the metal tang in it and pulled out over half of the stuffing to get it to flow... just try blowing into the breather from the engine side.. it should be fairly easy... on the E-vacs.. if you run muffs you CAN run into problems.. the e-vac will pull about 5"HG and for every inch of back pressure in the muffs you decrease the vac by the same amount... until you start making pressure and blows the check valve out and starts pressurizing the crankcase with exhaust gasses.... the thing is that the higher your RPM goes it wants to make more pressure... thats why on the city driving you figured it was fixed(low rpm) and at the track you spun it up
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Re: another broken valley pan!!
[Re: BigBlockMopar]
#1473800
07/25/13 10:17 AM
07/25/13 10:17 AM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
master
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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Have you tried lightening up your oil?
Mopar to the bone!!!
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Re: another broken valley pan!!
[Re: Crizila]
#1473803
07/25/13 10:55 AM
07/25/13 10:55 AM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: another broken valley pan!!
[Re: Thumperdart]
#1473806
07/25/13 01:06 PM
07/25/13 01:06 PM
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Joined: Nov 2010
Posts: 1,397 Carson City, Nevada
Biginchmopar
pro stock
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pro stock
Joined: Nov 2010
Posts: 1,397
Carson City, Nevada
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You need to run a leakdown test........way to much back pressure! I can tell you from experience some of the rings might be in upside down. A pan-a-vac will help if you don't run mufflers Keep us posted.
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Re: another broken valley pan!!
[Re: hornetnut]
#1473809
07/25/13 09:01 PM
07/25/13 09:01 PM
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Joined: Jul 2008
Posts: 30,454 Florida STAYcation
dOoC
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,454
Florida STAYcation
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Quote:
i pulled the intake and valley pan, checked the cam lobes and all look great, i did notice that the second cyl back on the pass side shows signs of the intake valve not seating correctly, theres black soot, looks like exhaust around the valve seat area and up.. maybe a valve too tight?
Horny ... you have more serious-issues than soot or a valve tooo tight. The last split/blown-up VP I saw had a hole in a piston the size of a nickel
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Re: another broken valley pan!!
[Re: dOoC]
#1473810
07/25/13 09:27 PM
07/25/13 09:27 PM
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Joined: Feb 2011
Posts: 76 california
hornetnut
OP
member
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OP
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Joined: Feb 2011
Posts: 76
california
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Quote:
Horny ... you have more serious-issues than soot or a valve tooo tight. The last split/blown-up VP I saw had a hole in a piston the size of a nickel
it doesnt run bad at all, no missfires no popping or anything weird, it runs awesome, the last time out it cracked the pan and i stuffed a bunch of rags under the intake to soak it up while i finished running that night, it still ran 11.60's just had to change the rags every round... leak down test it is...
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