GMPP Timing Chain Damper...
#2
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The LS engine has a area between 3800-4200 that has some strange harmonics. When you drive thru this zone the chain will start a bad whipping motion that will eventually lock up the links and cause failure. The fix in the original design was a stamped steel piece with a nylon guide that snapped on. That piece did not make production although they kept drilling and tapping the holes for about three years. We had a Motorola cup car somewhere around 1999-2000 that lost a transmission gear (3rd) during the race. This caused the driver to jump from 2nd to 4th forcing the engine thru the "bad" zone. The timing chain failed about one hour after the trans. The "fix" was to make a rub block like the original design. It stops the chain "whip" by giving the chain something to lean on.
Kurt
Kurt
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#8
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Originally Posted by 427
The LS engine has a area between 3800-4200 that has some strange harmonics. When you drive thru this zone the chain will start a bad whipping motion that will eventually lock up the links and cause failure. The fix in the original design was a stamped steel piece with a nylon guide that snapped on. That piece did not make production although they kept drilling and tapping the holes for about three years. We had a Motorola cup car somewhere around 1999-2000 that lost a transmission gear (3rd) during the race. This caused the driver to jump from 2nd to 4th forcing the engine thru the "bad" zone. The timing chain failed about one hour after the trans. The "fix" was to make a rub block like the original design. It stops the chain "whip" by giving the chain something to lean on.
Kurt
Kurt
My engine has a double chain on it - for what ever reason, the engine is very rough around 1800 to 2000 RPM. Go past that point or below that point and the engine is fine. It does not matter if it is under load or not. Could I be having a problem similar to what you are describing? I appreciate any information on it.
Thanks
Bill
#9
TECH Senior Member
Originally Posted by Bill's 02 Z-28 SS
Hi Kurt
My engine has a double chain on it - for what ever reason, the engine is very rough around 1800 to 2000 RPM. Go past that point or below that point and the engine is fine. It does not matter if it is under load or not. Could I be having a problem similar to what you are describing? I appreciate any information on it.
Thanks
Bill
My engine has a double chain on it - for what ever reason, the engine is very rough around 1800 to 2000 RPM. Go past that point or below that point and the engine is fine. It does not matter if it is under load or not. Could I be having a problem similar to what you are describing? I appreciate any information on it.
Thanks
Bill
#10
Does anyone have apic of one installed on a block, I was thinking of doing this but using a tensioner set that Comp makes..it's designed for a SBC but i'm sure I can make it work.
#11
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Originally Posted by Unaffiliated Racing
Does anyone have apic of one installed on a block, I was thinking of doing this but using a tensioner set that Comp makes..it's designed for a SBC but i'm sure I can make it work.
Ed