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87 944
Join Date: Oct 2008
Posts: 63
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Valve springs
How do i know if the springs are bad? I'm guessing they are because at around 5000 rpm engine sounds like *****. Ive replaced the distributor and soon to replace the rotor and the wires. Ill try and get a recording of what it sounds like if it helps but it sounds like its almost firing incorrectly or all at the same time? is this normal?
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11-21-2008, 09:52 AM
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Join Date: Apr 2006
Posts: 5,179
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I would think ore likely than the valve springs being bad would be the lifters being bad.
What type of oil are you using?
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11-21-2008, 10:53 AM
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87 944
Join Date: Oct 2008
Posts: 63
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10w 30 or 40, but it was exactly the same with 5w 30
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11-21-2008, 10:55 AM
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Join Date: Mar 2008
Location: Chicagoland
Posts: 2,695
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well 5w30 is way too thin. should be using at least 40 weight.
maybe it's a dead lifter? |
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11-21-2008, 10:58 AM
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87 944
Join Date: Oct 2008
Posts: 63
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i know thats what the po had in it. i checked and its 10 w40 that we put in because the oil pressure would drop and the light would go on which no longer happens with the new oil.
after driving it again and letting it warm up i can feel feedback in the gas pedal above 5k rpm Someone recommended bad springs and thats what my "co" worker guessed also how would i know the difference and what should i look for beside the obvious if i decide to start takin things apart?
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87 944 Last edited by porschenewb; 11-21-2008 at 11:59 AM.. |
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11-21-2008, 11:50 AM
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Greasy Member
Join Date: Mar 2006
Location: Indiana
Posts: 1,457
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The only way to check them is to pull the head off, remove the valves and check each spring for "squareness" and compression weight. The "squareness" is a check to make sure the sides of the springs are perpendicular to the top and bottom faces. Any speed/engine shop should be able to test the compression weight.
If you need the specs on the inner/outer comp weights, drop me a line and I can dig them up for you. More than likely it is the lifters, it takes ALOT of abuse to kill the Porsche double springs in these engines! Hope it helps! -Nick
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Owner: Bennington Motorsports www.benms.com Sponsor for Midwest Region 944-SPEC racing series -When was your timing belt changed or tensioned?? -Yes, I'm the crazy man that will loan out my 9201. Just PM me, I will add you to the list and get it out ASAP. |
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11-21-2008, 12:47 PM
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87 944
Join Date: Oct 2008
Posts: 63
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http://www.youtube.com/watch?v=YOYLzMzn9NQ here we go
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11-23-2008, 11:33 AM
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