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Author
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Topic: valve spring shims
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cracing
Gearhead Posts: 428
From: Saltillo Miss. USA
Registered: Jan 2002
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posted 12-29-2004 01:44 PM
   
Is there any set rule as to spring shims, like X thous. increases pressure by X ammount? They are supposed to lose approx. 10% after broken in according to Lunati, just wondering if any of you measure & reshim after breakin?
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Moneymaker
Administrator Posts: 26811
From: Lyons, IL, USA
Registered: May 99
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posted 12-29-2004 01:59 PM
I usually set them up 10-20 lbs stiffer than I want to run them in roller cam applications.
In MM's 289 I run about 250-260 on the seat, so I shim them to 270 or so new.
This is with a Nex Tek 1.610 spring at 1.950 installed height.
For flat tappets, I set them at the minimum requirement for the RPM desired and cam used.
The amount of pressure gained depends on the spring. There is no rule of thumb.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Buster
Gearhead Posts: 1553
From: Hurricane alley
Registered: May 2002
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posted 12-29-2004 02:23 PM
quote:
Originally posted by Moneymaker:
This is with a Nex Tek 1.610 spring at 1.950 installed height.
I've never heard of Nex Tek springs.... info?
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cracing
Gearhead Posts: 428
From: Saltillo Miss. USA
Registered: Jan 2002
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posted 12-29-2004 02:30 PM
quote:
Originally posted by Moneymaker:
I usually set them up 10-20 lbs stiffer than I want to run them in roller cam applications.
In MM's 289 I run about 250-260 on the seat, so I shim them to 270 or so new.
This is with a Nex Tek 1.610 spring at 1.950 installed height.
For flat tappets, I set them at the minimum requirement for the RPM desired and cam used.
The amount of pressure gained depends on the spring. There is no rule of thumb.
AH, rule of thumb, thats the word I was searching for. Mine are flat tappets with 140# on seat (new) 1.550 od, 1.940 height
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Moneymaker
Administrator Posts: 26811
From: Lyons, IL, USA
Registered: May 99
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posted 12-29-2004 02:42 PM
quote:
Originally posted by cracing:
AH, rule of thumb, thats the word I was searching for. Mine are flat tappets with 140# on seat (new) 1.550 od, 1.940 height
On a brand new cam, I would not set them up anymore than that. (140#)
Used cam, I would go to 150#. ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Moneymaker
Administrator Posts: 26811
From: Lyons, IL, USA
Registered: May 99
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posted 12-29-2004 02:48 PM
quote:
Originally posted by Buster:
I've never heard of Nex Tek springs.... info?
Let's see if this link works?
http://www.manleyperformance.com/pdfs/NEXTEK-66.pdf
------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
n2oMike
Gearhead Posts: 2680
From: Spencer, WV
Registered: Jan 2001
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posted 12-29-2004 03:26 PM
You'll need to find the spring rate for whatever part number spring you've got. This is how many pounds is required to compress the spring each inch of travel.To see how many pounds the pressure will change, simply multiply the spring rate x the amount the spring is shimmed. For example, if the spring rate is 300lbs/inch... and a 0.030" shim is used... 300lbs/in x 0.030" = 9lbs Comp usually lists their spring rates in their catalog. They may even be available in their online catalog. Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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cracing
Gearhead Posts: 428
From: Saltillo Miss. USA
Registered: Jan 2002
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posted 12-29-2004 03:28 PM
quote:
Originally posted by Moneymaker:
On a brand new cam, I would not set them up anymore than that. (140#)
Used cam, I would go to 150#.
I'll set them on 150#. On last teardown there was a small ammount of galling on outside of keepers and on keeper area of valve stem. A symptom of not enough spring, you think?Although this time I used titanium retainers, 10 degree locks & lighter valves.Maybe that will help too?
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cracing
Gearhead Posts: 428
From: Saltillo Miss. USA
Registered: Jan 2002
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posted 12-29-2004 03:37 PM
Mike, Lunati is the only one I have found that supplies this particuler spring. Its the 73121. I'm sure someone else has it or close to it, but I havent found it. It is the one recommended in the kit & cam I had ground years ago. Springs have been the root of all my repairs.
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Fordwiser
Gearhead Posts: 428
From: Metamora, Illinois
Registered: Dec 2000
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posted 12-29-2004 06:53 PM
Anyone have, or used the Moroso valve seat pressure tester?
Roger
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Moneymaker
Administrator Posts: 26811
From: Lyons, IL, USA
Registered: May 99
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posted 12-29-2004 08:05 PM
I had one and sold it at a swap meet.
It was only accurate to 10-15 lbs.
I have an LSM unit now and it is tits!  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
Fordwiser
Gearhead Posts: 428
From: Metamora, Illinois
Registered: Dec 2000
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posted 12-30-2004 12:20 AM
LSM ? Will it clear the strut towers on a fox body with Cleveland heads?
Roger
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Ryan Wilke
Gearhead Posts: 2265
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 12-30-2004 09:13 AM
Roger,
Check it out here.... http://www.jegs.com//cgi-bin/ncommerce3/ProductDisplay?prrfnbr=36273&prmenbr=361 Ryan 
IP: Logged |
n2oMike
Gearhead Posts: 2680
From: Spencer, WV
Registered: Jan 2001
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posted 12-30-2004 09:34 AM
Just make sure the shim the valve spring actually sits on is HARDENED. Springs will eat through the nonhardened ones. Hardened shims are generally those thin (0.015") BLUE colored ones. Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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Moneymaker
Administrator Posts: 26811
From: Lyons, IL, USA
Registered: May 99
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posted 12-30-2004 11:19 AM
quote:
Originally posted by Fordwiser:
LSM ? Will it clear the strut towers on a fox body with Cleveland heads?
Roger
They can custom make the handle for you like they did for me.
Clears the shock towers and braces.
Also, it screws into two different spots for access. ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
Moneymaker
Administrator Posts: 26811
From: Lyons, IL, USA
Registered: May 99
|
posted 12-30-2004 11:24 AM
quote:
Originally posted by n2oMike:
Just make sure the shim the valve spring actually sits on is HARDENED. Springs will eat through the nonhardened ones. Hardened shims are generally those thin (0.015") BLUE colored ones. Good Luck!
Actually the hardened ones come in several colors.
Blue, green, purple, and pinkish.
Usually the different colors signify different thicknesses. ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
cracing
Gearhead Posts: 428
From: Saltillo Miss. USA
Registered: Jan 2002
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posted 12-31-2004 12:22 PM
quote:
Originally posted by n2oMike:
Just make sure the shim the valve spring actually sits on is HARDENED. Springs will eat through the nonhardened ones. Hardened shims are generally those thin (0.015") BLUE colored ones. Good Luck!
I have spring seat cups & use shims under them.
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R&J MOTORSPORTS
Journeyman Posts: 93
From: Tampa,Fl.
Registered: Aug 2000
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posted 01-01-2005 07:35 PM
Alex, Joe here. Can you show us a picture of the custom made handle for the above tool? I need one for mine.------------------
Joe Strunk
NHRA SS/MA 2890
1964 SS/MA Comet
1965 PRO-Street Fairlane
1966 Fairlane Conv.
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