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SVTPerformance's Chain of Restaurants
A Taste of Home
West
almost blew up the saleen!!!!
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<blockquote data-quote="JaKaL" data-source="post: 1325129" data-attributes="member: 14466"><p>I’m not sure either MS, but if the car runs without major and obvious metal to metal noise then there is a good chance that timing components are to blame. The whole valve train is suspect at this point and in a DOHC engine even little things can have a big impact. The TICK for example has been blamed on everything from heat to torque specs on the cam tower retainer bolts.</p><p>5 seconds on the limiter should not have contributed too much to heat and if the oil was clean to begin with it is unlikely that a high rev condition would cause problems on the bottom end. Rough idle is not usually associated with main, cap, wrist pin or even cam bearings. It can and will skip or stretch chains, break or distort chain tensioners, mar or dislodge valve retaining clips, break valve springs and as mentioned before, destroy guides. Hell, it may even bust a cam strut tower or bust a bolt.</p><p>After fuel and vacuum, a leakdown test and careful visual inspection with the valve covers off will get you started to isolate the problem. My guess is the damage has already been done and troubleshooting at no-load RPM’s under 1,000 would not do further significant damage.</p><p>Of course you want to visually inspect things with the valve covers off first using an ignition off battery crank and a good stethoscope. A slow crank may lead you to a chain problem if nothing obvious seems wrong up top. Note though that valves are designed, at least they used to be, to be free to rotate ever so slightly and the only way to check is either with a micrometer or at idle with a timing light. If it doesn’t rotate, it is probably bent or has a bad guide. Not that I’d know where to even hook up a timing light on a coil on plug beast. God I’m old.</p><p>Anyway, a good mechanic will take it one step at a time checking tolerance as he/she goes. Total failures are rare and chances are good it is either a single cylinder issue or a chain issue isolated to one bank.</p><p>PM me if you like, if I get my snake back tomorrow I’d be happy to ride out and listen-and bring my stethoscope with me.</p></blockquote><p></p>
[QUOTE="JaKaL, post: 1325129, member: 14466"] I’m not sure either MS, but if the car runs without major and obvious metal to metal noise then there is a good chance that timing components are to blame. The whole valve train is suspect at this point and in a DOHC engine even little things can have a big impact. The TICK for example has been blamed on everything from heat to torque specs on the cam tower retainer bolts. 5 seconds on the limiter should not have contributed too much to heat and if the oil was clean to begin with it is unlikely that a high rev condition would cause problems on the bottom end. Rough idle is not usually associated with main, cap, wrist pin or even cam bearings. It can and will skip or stretch chains, break or distort chain tensioners, mar or dislodge valve retaining clips, break valve springs and as mentioned before, destroy guides. Hell, it may even bust a cam strut tower or bust a bolt. After fuel and vacuum, a leakdown test and careful visual inspection with the valve covers off will get you started to isolate the problem. My guess is the damage has already been done and troubleshooting at no-load RPM’s under 1,000 would not do further significant damage. Of course you want to visually inspect things with the valve covers off first using an ignition off battery crank and a good stethoscope. A slow crank may lead you to a chain problem if nothing obvious seems wrong up top. Note though that valves are designed, at least they used to be, to be free to rotate ever so slightly and the only way to check is either with a micrometer or at idle with a timing light. If it doesn’t rotate, it is probably bent or has a bad guide. Not that I’d know where to even hook up a timing light on a coil on plug beast. God I’m old. Anyway, a good mechanic will take it one step at a time checking tolerance as he/she goes. Total failures are rare and chances are good it is either a single cylinder issue or a chain issue isolated to one bank. PM me if you like, if I get my snake back tomorrow I’d be happy to ride out and listen-and bring my stethoscope with me. [/QUOTE]
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SVTPerformance's Chain of Restaurants
A Taste of Home
West
almost blew up the saleen!!!!
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