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Re: P-V clearance with MP 590?
[Re: MR_P_BODY]
#1444732
05/30/13 07:26 PM
05/30/13 07:26 PM
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Joined: Jul 2008
Posts: 610
Boise
Moparteacher
mopar
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mopar
Joined: Jul 2008
Posts: 610
Boise
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Quote:
Put a test spring on the intake and the exhaust and
test your own set up... use a dial indicator and at full
lift push down on the rocker and measure the distance
Ahhh. You know better than this. Measuring at full lift won't yield results. The piston will be half way down the hole. He needs to measure 10 to 20 degrees before top dead center for the opening of the intake valve and 10 to 20 degrees after top dead center for the closing of the exhaust valve. Valve to piston clearance is only a concern during a 40 degree swing through overlap.
Here's another option that requires almost no tools. But, only works for flat top pistons. Take a CD or two and set it on top of the piston. A typical compact disc is .060" thick. So two CDs will equal .120". Now reassemble the engine, set lash at zero, and turn it over by hand nice and slow. If it stops then the valves are too close. Some trimming of the CD may be necessary to clear the quench area.
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Re: P-V clearance with MP 590?
[Re: Moparteacher]
#1444734
05/30/13 08:27 PM
05/30/13 08:27 PM
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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:
Quote:
Put a test spring on the intake and the exhaust and
test your own set up... use a dial indicator and at full
lift push down on the rocker and measure the distance
Ahhh. You know better than this. Measuring at full lift won't yield results. The piston will be half way down the hole. He needs to measure 10 to 20 degrees before top dead center for the opening of the intake valve and 10 to 20 degrees after top dead center for the closing of the exhaust valve. Valve to piston clearance is only a concern during a 40 degree swing through overlap.
Here's another option that requires almost no tools. But, only works for flat top pistons. Take a CD or two and set it on top of the piston. A typical compact disc is .060" thick. So two CDs will equal .120". Now reassemble the engine, set lash at zero, and turn it over by hand nice and slow. If it stops then the valves are too close. Some trimming of the CD may be necessary to clear the quench area.
I've only seen any issues within 10* either side of 0
but if it was even close I would have said something...
but I dont think its gonna be close so why say anything
but its a moot point since he isnt gonna check it
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Re: P-V clearance with MP 590?
[Re: Thumperdart]
#1444737
05/30/13 09:02 PM
05/30/13 09:02 PM
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Joined: Feb 2007
Posts: 1,025
Las Vegas, NV
dodgeboy11
super stock
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super stock
Joined: Feb 2007
Posts: 1,025
Las Vegas, NV
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Since I hate to see a (possibly) good engine ruined, I suggest you just stick clay in the valve reliefs of your pistons, yes, this will require removing the heads and replacing head gaskets, reinstall the heads with the used (crushed) head gaskets, install your pushrods and rocker arms, adjust for zero lash and rotate the engine over a few times. Obviously, if the engine gets difficult to turn, don't get a bigger bar.
You need to understand that your question has no answer. Where is the cam installed at? What is your piston to deck clearance? How thick are the head gaskets? How big are the valve heads? How close to the deck surface of the heads are the valve heads? What rocker ratio? The only way to find the answer is to check it yourself or have someone with the tools do so.
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Re: P-V clearance with MP 590?
[Re: MR_P_BODY]
#1444738
05/30/13 09:08 PM
05/30/13 09:08 PM
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Joined: Jul 2008
Posts: 610
Boise
Moparteacher
mopar
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mopar
Joined: Jul 2008
Posts: 610
Boise
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Quote:
Holy chit, that`s hilarious................  I thaught and HOPE the cd thing was a joke........... 
If I was able to put some CDs in there I would just
clay it... JMO
Stupid? yes, but not a joke. I found myself assembling a 383 with flat tops a few years ago without clay or checking springs. So I started to look around the house for spacers. All I found were some unused CDR's. I measured them at .060" and thought...Hmmm, if it clears the disc's then it's good to go. It actually worked. Ya...no joke. I'm a genius!
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Re: P-V clearance with MP 590?
[Re: 11secondC]
#1444741
05/30/13 11:04 PM
05/30/13 11:04 PM
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Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Quote:
fwiw.I've actually met Mike in the pits a few years back, seemed like a nice enough guy...my apologies to him for being so curt...
Yep, your first response was curt, but your apologie is good.  
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Re: P-V clearance with MP 590?
[Re: viperblue72]
#1444744
05/31/13 05:30 AM
05/31/13 05:30 AM
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Joined: Dec 2006
Posts: 4,647
aotearoa
rebel
master
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master
Joined: Dec 2006
Posts: 4,647
aotearoa
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Quote:
I filled my valve relieves with clay on my last engine. Turn the crank over a few times, then measure the thickness of the clay where the valve hits it. You can do this without gasket too just to get a rough estimate. My engine never even touched the clay so I knew I was good. Hope that helps.
was doing exactly that last night, we had clipped a few valves so we looking for the touchy touchy bit but couldn't find any. guess we had valve float so new springs next season.
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Re: P-V clearance with MP 590?
[Re: MR_P_BODY]
#1444747
05/31/13 11:53 AM
05/31/13 11:53 AM
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Joined: Jan 2003
Posts: 4,395
The Pale Blue Dot
Skeptic
master
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master
Joined: Jan 2003
Posts: 4,395
The Pale Blue Dot
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Quote:
I guess 11second found his answer so he deleted the post..
hope his answer is right... best of luck to him
At least he's learned that deleting the first post of a thread does NOT delete the thread. 
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Re: P-V clearance with MP 590?
[Re: Skeptic]
#1444748
05/31/13 12:10 PM
05/31/13 12:10 PM
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Joined: Feb 2005
Posts: 20,200
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,200
PA.
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This post is typical of wanting help but not giving enough info to get the proper help. I personally hate texting and refuse to do business that way because I want to make sure everything is communicated properly. HOW DO YOU CHECK VALVE TO PISTON. Can I run this cam? Well are the heads cut, or maybe the block? Almost every engine and combo will be different.  I've only ever BLOCKED one person on this site "oldman" But after his response he's on the fence.
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Re: P-V clearance with MP 590?
[Re: pittsburghracer]
#1444749
05/31/13 12:53 PM
05/31/13 12:53 PM
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Joined: Jul 2007
Posts: 1,682
Philadelphia
radar
top fuel
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top fuel
Joined: Jul 2007
Posts: 1,682
Philadelphia
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Haha funny thread! No chance of hijacking now... Where do I apply to get into the moparts clique? If I am accepted will you send me the tool to clay test p/v clearance thru the plug hole? If I lick the clay and it's salty can I assume it's safe to eat? If I lick my windows will the factory tint start to wear thin? I actually tried the water thing once on a ford 429, but forgot to rev it to the moon before hydro-locking it. I had a nice gas fire going and threw a handy trash can full of water on it in despiration for lack of a blanket. Saved the wires and hoses, trashed the oil. Shoulda taken a picture of my room mate's face when I cranked it over later and water shot out the plug holes! 
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Re: P-V clearance with MP 590?
[Re: radar]
#1444750
05/31/13 01:07 PM
05/31/13 01:07 PM
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Joined: Feb 2005
Posts: 20,200
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,200
PA.
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Speaking of water, watch the end of this video. http://www.youtube.com/watch?v=2RBRCaVjYrM
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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