Tired engine

LX5liter · 08-31-2003, 09:35 AM

I think my engine's on its way out. When I start it there is a knocking sound on the drivers side. It's pretty loud until it warms up then it goes almost totally away. I'm thinking a scuffed or broken piston, or maybe something as simple as a bad lifter. The middle two cylinders are running about 100 degrees hotter than the other 6, so I'm thinking that's where the problem is. Any other thoughts? I haven't got around to a compression test yet, but I will do that asap.
The engine does have over 160,000km (100,000 miles) on it, and I've been beating on it at the track pretty good this year (w/ 10#'s of boost) so the engine doesn't owe me a darn thing, I was just hoping it would get me through two more races. I will be building a 331 for it over the winter. Should I get a pool going to see how long it will last? 1 race, 2 races, or less?

PKRWUD · 08-31-2003, 07:34 PM

This should help.

Take care,
~Chris

LX5liter · 09-01-2003, 01:41 PM

Thanks Chris, by the descriptions you give it is probably piston slap. I'll have to do some more checking, and try the 40 weight oil test.

08-31-2003, 09:35 AM	#1
LX5liter dude5l Join Date: May 2001 Location: Grande Prairie, Alberta, Canada Posts: 603	Tired engine I think my engine's on its way out. When I start it there is a knocking sound on the drivers side. It's pretty loud until it warms up then it goes almost totally away. I'm thinking a scuffed or broken piston, or maybe something as simple as a bad lifter. The middle two cylinders are running about 100 degrees hotter than the other 6, so I'm thinking that's where the problem is. Any other thoughts? I haven't got around to a compression test yet, but I will do that asap. The engine does have over 160,000km (100,000 miles) on it, and I've been beating on it at the track pretty good this year (w/ 10#'s of boost) so the engine doesn't owe me a darn thing, I was just hoping it would get me through two more races. I will be building a 331 for it over the winter. Should I get a pool going to see how long it will last? 1 race, 2 races, or less? __________________ Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542

08-31-2003, 07:34 PM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	This should help. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

09-01-2003, 01:41 PM	#3
LX5liter dude5l Join Date: May 2001 Location: Grande Prairie, Alberta, Canada Posts: 603	Thanks Chris, by the descriptions you give it is probably piston slap. I'll have to do some more checking, and try the 40 weight oil test. __________________ Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542

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