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| matts85vet | broken valve spring -- need advice | ||
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Guru
 
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the ex valve spring on #4 broke. the valve didn't drop down completely, only about 1/4 inch. retainer and keepers still on the valve.
leak down test shows same results as other pistons-all around 5%. i pulled the head today. no damage as far as i can tell without some more cleaning. the valve did touch the cylinder and wore away some of the buildup of grime, and you can see where there was contact. i still need to remove the broken spring and valve and clean it up. the pistons are forged? its an 85. it was a comp beehive i ordered a new nitrided series set #1519 from pac, yet to arrive what should i do? ill try to get pics tomorrow thanks in advance |
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Posted on: 2012/9/23 3:45
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85 coupe, 383, TPIS Miniram, auto 700R4, 3.75 gears, afr 180 eliminator heads 58cc, 12:1 compression ratio, comp cams 280XFI hydraulic roller cam, 1.65 roller rockers, 52mm throttle body, c5 calipers, hedman elite longtube headers, pypes dual exhaust w/x- |
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| bogus | Re: broken valve spring -- need advice | ||
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Grand Imperial Pooh-Bah
 
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It seems you already have the answer... I would replace springs and move on.
I assume the miles on the engine are rather low, right? |
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Posted on: 2012/9/23 3:50
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Matatk | Re: broken valve spring -- need advice | ||
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Webmaster
 
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My question is why did it break? What RPM are you running at and are the springs you selected suited for your cam?
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Posted on: 2012/9/23 11:49
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| rklessdriver | Re: broken valve spring -- need advice | ||
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Senior Guru
 
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Since you can see where the valve contacted the piston, I would recommend you take that valve to a machine shop and have it trued up.
It takes alot more than a valve bump to damage a piston. Nothing to worry about there. Will |
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Posted on: 2012/9/23 22:20
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1984 Corvette. 434 SBC with a Powerglide. Best pass - 8.48@160MPH 1.23 60ft on MT 275/60R15 Radials. 1972 Corvette. LS5 454 BBC with M20 4 speed. Best Pass - Doing good to just pass a gas station. |
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| EngineDoctor | Re: broken valve spring -- need advice | ||
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Master Guru
 
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Yes , have a machine shop set u you up !
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Posted on: 2012/9/24 1:05
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