Ecotec Cylinder 4 wear - common issue problem in performance applications?
In my little world, I seem to have noticed a pattern with Cylinder 4 in the 2.4 Ecotecs.
Block 1: Stock and boosted 2006 LE5 block, Cylinder 4 cylinder worn out bad (0.015" over spec) Block 2: Built and boosted 2015 LEA block, Cylinder 4 has the lowest compression and worst leak down result Block 3: Stock never boosted 2012 LEA block, Cylinders 1-3 measure 0.0006" wear over spec, Cylinder 4 measures 0.0010" wear over spec Could this be a problem with block cooling around Cylinder 4? Anyone notice something like this? |
it's been known since 05 that cyl4 runs hot. it's at the end of the cooling chain.
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Originally Posted by armcclure
(Post 7703263)
it's been known since 05 that cyl4 runs hot. it's at the end of the cooling chain.
Out coolant pump -> Cyl 1 water jacket -> flow across Cyl 2-3-4 water jackets (some leakage through head gasket) -> up through rear of Cyl 4 -> Into Cyl head at Cyl 4 -> flow across Cyl 3-2-1 -> Exit head at Cyl 1 -> back down into block near Cyl 1 A possible cure I envision is to plumb a restricted hose from the outlet of the water pump directly to the Cyl 4 water jacket at a strategic location to give it priority cooling with the coolest coolant, that might be cool. |
I never run engines long enough to notice accelerated wear. How many miles did you personally put on those engines and are you sure they werent already worn before you got them? |
Originally Posted by Slowbalt2000
(Post 7705439)
I never run engines long enough to notice accelerated wear. How many miles did you personally put on those engines and are you sure they werent already worn before you got them? |
I feel like the only way to really tell would be to build a new engine and record all the measurements, then run a certain amount of miles of how you would normally drive the car(maybe 10k miles), then tear down and remeasure. Putting thermocouples in different areas of the cooling circuit during this testing would probably help prove your case. Either way, its an interesting thought.
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