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[ 6 posts ] |
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How to shim valve springs.
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dguidry
MMT Super Elite Member
Joined: Tue Jun 29, 2010 1:20 pm
Posts: 11166
Location: Cecilia, LA
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 How to shim valve springs. After installing my new performance cam in my GTR23, I will have to sim valve springs. Asking if my assumptions are correct. 1. After compressing spring looks like a C clamp hold the spring secure? 2. The shim discs go at the very bottom of the spring cavity? 3. How many shims or discs should I use? Hoyt said he uses 3 or 4 in his 35 mods. I presume I'll have to experiment to find the the best power distribution?
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Formerly:1648 Homemade Cypress Crawfish Skiff GTR23 Performance Cam and Heads; 17x46 Gator Tail with 35GTR and Hoyt's cam;s Currently: 17x48 Gator Tail with XD40 EFI.
“Wisdom is not just expertise. It is knowing how much of various areas of expertise you need to know in order to make the decisions that the world needs and that you want to do,” Columbia University President Lee Bollinger.
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| Sun Feb 20, 2011 11:23 pm |
 
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deadbird8
MMT 1000 Club
Joined: Wed Feb 04, 2009 7:50 pm
Posts: 3833
Location: Old East Dallas, Texas
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Re: How to shim valve springs. Do you have a valve spring compress tool to do this?
Its not an experiment and does not affect 'power distribution', shim 0.120- you should buy them machined already as a single piece. You want them all the same. You don't need to do this unless you are planning on running higher RPM (reference the other thread and your decision on governor).
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Excel 1851F4 w/ MB35HD+R CDI with a little bit of this and little bit of that
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| Mon Feb 21, 2011 6:59 am |
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dguidry
MMT Super Elite Member
Joined: Tue Jun 29, 2010 1:20 pm
Posts: 11166
Location: Cecilia, LA
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Re: How to shim valve springs.
_________________
Formerly:1648 Homemade Cypress Crawfish Skiff GTR23 Performance Cam and Heads; 17x46 Gator Tail with 35GTR and Hoyt's cam;s Currently: 17x48 Gator Tail with XD40 EFI.
“Wisdom is not just expertise. It is knowing how much of various areas of expertise you need to know in order to make the decisions that the world needs and that you want to do,” Columbia University President Lee Bollinger.
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| Mon Feb 21, 2011 8:50 am |
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dguidry
MMT Super Elite Member
Joined: Tue Jun 29, 2010 1:20 pm
Posts: 11166
Location: Cecilia, LA
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Re: How to shim valve springs. DIY valve spring compressor
_________________
Formerly:1648 Homemade Cypress Crawfish Skiff GTR23 Performance Cam and Heads; 17x46 Gator Tail with 35GTR and Hoyt's cam;s Currently: 17x48 Gator Tail with XD40 EFI.
“Wisdom is not just expertise. It is knowing how much of various areas of expertise you need to know in order to make the decisions that the world needs and that you want to do,” Columbia University President Lee Bollinger.
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| Wed Feb 23, 2011 8:54 am |
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retired and broke
MMT Pro Member
Joined: Sat May 01, 2010 2:44 pm
Posts: 411
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Re: How to shim valve springs. And why don't you have a rag covering that spark plug hole, so nothing falls in there?
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| Wed Feb 23, 2011 10:31 am |
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dguidry
MMT Super Elite Member
Joined: Tue Jun 29, 2010 1:20 pm
Posts: 11166
Location: Cecilia, LA
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Re: How to shim valve springs.
_________________
Formerly:1648 Homemade Cypress Crawfish Skiff GTR23 Performance Cam and Heads; 17x46 Gator Tail with 35GTR and Hoyt's cam;s Currently: 17x48 Gator Tail with XD40 EFI.
“Wisdom is not just expertise. It is knowing how much of various areas of expertise you need to know in order to make the decisions that the world needs and that you want to do,” Columbia University President Lee Bollinger.
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| Wed Feb 23, 2011 11:01 am |
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