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Registered
Join Date: Mar 2004
Location: Seattle
Posts: 1,802
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Need help identifying these valve springs and retainers
I have a 2.8 short stroke motor that uses 3.2 heads and valves and turns 8,000 rpm. It was built by Deman Motorsports in New York, but I don't have a build sheet for it. It has aftermarket valve springs with Ti retainers. I recently had the inner spring on the #1 intake valve break. I am going to replace all springs, but I would like to reuse the Ti retainers. Thus I was hoping some of the experts here could help me identify what I already have.
Here is one of my unbroken springs next to a stock spring.  The uncompressed spring measures 50mm.  With the retainer, the stack measures 52mm uncompressed.  The outer spring diameter is 14mm.  The inner spring diameter is 10.5mm.  Here is the Ti retainer.  
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Brooke 1969 911 ST 2.8SS EFI ITB (Irish Green), 1974 911 3.6 ITB (Black) 1952 MG TD with F20C Last edited by rswannabe; 12-30-2013 at 11:55 AM.. |
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12-29-2013, 05:32 PM
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Registered
Join Date: Mar 2004
Location: Seattle
Posts: 1,802
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I spoke with Rick Deman today and he thinks they may be either Web Cam springs or Jerry Woods. Anyone familiar with the specs of either of their performance spring sets?
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Brooke 1969 911 ST 2.8SS EFI ITB (Irish Green), 1974 911 3.6 ITB (Black) 1952 MG TD with F20C |
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12-30-2013, 11:57 AM
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Puny Bird
Join Date: Nov 2002
Location: Port Hope (near Toronto) On, Canada
Posts: 4,566
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My bet is domestic, comp cams...crower...try measuring and searching in inches.
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'74 Porsche 914, 3.0/6 '72 Porsche 914, 1.7, wife's summer DD '67 Bug, 2600cc T4,'67 Bus, 2.0 T1 Not putting miles on your car is like not having sex with your girlfriend, so she'll be more desirable to her next boyfriend. |
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01-01-2014, 04:44 PM
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Registered
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Since you're replacing all the springs, is it imperative you replace with the same exact brand? There are other spring suppliers for your engine (e.g. Aasco, etc.). Measure existing spring pressure at installed and max. valve lift height and find a close match. Installed height with retainers is adjusted during fit-up/installation.
You may wish to simply look up an engine application chart from Webcam, ERP, Patrick MS, TRE, etc., but here's a spring spec chart used by a source (not 911):  Sherwood |
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01-03-2014, 12:43 PM
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