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#2429174 - 01/04/18 06:27 PM Re: How long would you leave valve springs compressed? [Re: mickm]
AndyF Offline
Too Many Posts

Registered: 01/20/03
Posts: 23815
Loc: Oregon
How long would you leave a book sitting on a shelf? The valve springs in that engine are probably under no more load than the book shelves in your house or the kitchen table.

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#2434290 - 01/14/18 03:16 AM Re: How long would you leave valve springs compressed? [Re: mickm]
Sxrxrnr Offline
pro stock

Registered: 07/28/13
Posts: 1219
Loc: Northern Calyfornua
I have been waiting for a theoretical engineer type to tell us that a spring sitting in a compressed state,,,valve open,,,,undergoes any more stress than operating at 1000's, millions of opens and closings over a period of time,,,,just wondering. Like a bolt torqued to say a 100 pounds for 10 years,,,will the bolt stretch any amount that after 10 years, would it would show any less torque than initial torque reading.

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#2434309 - 01/14/18 07:32 AM Re: How long would you leave valve springs compressed? [Re: mickm]
gregsdart Offline
master

Registered: 01/21/03
Posts: 8218
Loc: Frostbitefalls (Rocky&Bullwink...
I believe Monte Smith said not to worry about leaving them compressed. It probably has more to do with the quality of spring material than whether they are compressed or not.
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Educated at SHK U
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528 cubic inch alky injected 440-1 wedge, 3055 race weight.
8.779 at 153.16 mph. 1.289 60 ft. density altitude 1617 feet. Best 60 ft 1.24

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#2434331 - 01/14/18 08:39 AM Re: How long would you leave valve springs compressed? [Re: mickm]
earlymopar Offline
super stock

Registered: 01/30/03
Posts: 808
Loc: Oregon
A spring that is properly designed, correctly manufactured and in an application that is allows it to operate within design specs, can sit compressed indefinitely.

- EM

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#2434346 - 01/14/18 09:16 AM Re: How long would you leave valve springs compressed? [Re: mickm]
hemi-itis Offline
I Live Here

Registered: 12/29/07
Posts: 10435
Loc: Great Neck,LI,new york
I was told it's the amount of cycles a spring goes through determines it's lifespan. work
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New best 60ft,, 1.42,1/8, 6.0 @117,, 9.38 @146.75 with 6 lbs boost @3700 lbs

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#2434361 - 01/14/18 09:44 AM Re: How long would you leave valve springs compressed? [Re: hemi-itis]
moparx Offline
master

Registered: 09/03/03
Posts: 8501
Loc: north of coder
would spring compression, leaving valves open inviting rust on valves and seats, possibly causing valve sealing issues be somewhat a more important issue to be concerned about than loss of spring tension ?
beer

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#2434382 - 01/14/18 10:22 AM Re: How long would you leave valve springs compressed? [Re: moparx]
Hot 340 Offline
master

Registered: 12/01/06
Posts: 3138
Loc: Pa
I would be more concerned using a hydraulic cam and lifter setup in a motor that has intersecting valve centerlines. twocents

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