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Old 03-27-2010, 04:58 PM
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454 sounds like a diesel?

My engine has started to tick lately and sounds like a diesel. I have heard of people with comp xe cams that have said they were noisey, would this also apply to their roller cams? Motor runs good and has always had slight tick, but sounds more and more like a diesel. Not an exhaust leak and full of oil. Confused?

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Old 03-27-2010, 10:26 PM
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Excessive piston to wall clearances sound identical to a diesel, been there done that.
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Old 03-27-2010, 10:52 PM
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Are you sure its not your oil that caused the problem? The damage may already done. Check out the zinc additives in motor oils to see if your oil measures up.
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Old 03-28-2010, 07:13 AM
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If its excessive piston to wall clearance would that shorten the life of the engine? The cam is a roller with roller lifters so i dont think its the oil.
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Old 03-28-2010, 07:50 AM
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Quote:
Originally Posted by turchiac
My engine has started to tick lately and sounds like a diesel. I have heard of people with comp xe cams that have said they were noisey, would this also apply to their roller cams? Motor runs good and has always had slight tick, but sounds more and more like a diesel. Not an exhaust leak and full of oil. Confused?
Cast or forged pistons?

Has the engine been detonating? How many miles on it? How is it used?

Has it overheated? No one likes to admit to having done something they might not should have done, but you gotta be truthful...

If it was driven hot, this can collapse the skirts enough to cause piston slap.
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Old 03-28-2010, 10:00 AM
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Quote:
Originally Posted by DoubleVision
Excessive piston to wall clearances sound identical to a diesel, been there done that.
what he said.....inline 4.0 Jeeps can sound like that too ...piston slap
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Old 03-28-2010, 03:02 PM
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Pistons are wiesco forged, Engine has no detonation, around 10,000 miles since rebuild and never overheated also gets driven spiritedly. Runs fine just sounds like a sewing machine/Diesel. It also uses quite a bit of oil but doesnt foul out the plugs or smoke, zero blowby. About a quart every 500 miles?

Last edited by turchiac; 03-28-2010 at 03:10 PM.
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Old 03-28-2010, 04:10 PM
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I suppose "spirited" driving combined w/the piston to wall clearance starting out at the high limit could, in 10K miles- open the clearance up enough to get some slap.

The life expectancy does diminish w/increased piston clearance, the piston is rocking in the bore, this rounds the ring faces and will cause increased blowby. The blowby would be expected to be somewhat worse w/a higher CR.
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Old 03-28-2010, 04:47 PM
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One thing i forgot is the weisco pistons have a compression height of 1.395 and the rods are longer than stock at 6.385. Dont know if this matters.
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Old 03-28-2010, 04:52 PM
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Quote:
Originally Posted by turchiac
One thing i forgot is the weisco pistons have a compression height of 1.395 and the rods are longer than stock at 6.385. Dont know if this matters.
W/o looking those up, I'd guess the skirt is shorter than an OEM piston, if so this could also be a contributing factor to the rock/slap.

I'm also guessing there's no oil leaking, so if it's going through the combustion chamber just keep an eye on your plugs and for detonation.
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Old 03-28-2010, 05:01 PM
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Thanks ill keep an eye on the plugs. The noise is driving me nuts
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Old 03-28-2010, 05:43 PM
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Cobalt, isnt piston slap suppose to quite down after the engine warms up? This noise doesnt go away or even quiet down. Its the same on start up as it is when i shut it down.
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Old 03-28-2010, 05:50 PM
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Quote:
Originally Posted by turchiac
Cobalt, isnt piston slap suppose to quite down after the engine warms up? This noise doesnt go away or even quiet down. Its the same on start up as it is when i shut it down.
Yes- you would expect it to lessen. If it's bad enough, it will always be there, even warm. I got off on the piston slap tangent because of the noise being likened to a diesel running, which sounds a little like slap- even though it is basically detonation you are hearing. God forbid your engine is detonating that bad- it wouldn't last a hundred miles, so I doubt that's the problem- but reducing the timing temporarily just to see if it helps would tell you.

You can also remove one plug wire at a time and see if the noise changes or diminishes. But just let me say, noises are hard to diagnose over the internet. Piston slap is but on of several things that it could be.

If you want to try to narrow it down, there are mechanic's stethoscopes that are used to pinpoint the source if noises.

In a pinch, a length of fuel hose will do nearly as good of a job, held to your ear, the other end moved around against the block, heads, covers, etc. to locate where the noise is coming from.

If you do either, keep loose clothing, hands, etc. away from moving parts, wear eye protection and remove watches, rings, necklaces, etc. that could be caught in something.

Bearings will make noise, as will the parts of the valve train. Accessories like the w/p, f/p, alternator, timing chain inside the cover, etc. can ALL cause noise.

Last edited by cobalt327; 03-28-2010 at 05:56 PM.
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Old 03-28-2010, 05:54 PM
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OK, thanks again cobalt. Ill give that a try.
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Old 03-28-2010, 07:39 PM
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my 77 454

my 77 sounded like that , but it was just one tic or slap , what it was is when i put some flow masters on i reaved engine a lot at first , just to hear it , and with a rebuilt engine with just honed cyl.'s a pce off skirt broke and was hanging there or jamed inthere and was ticking

i did everything i though it was new dist. new lifters etc.

then after no help tore it down and that's what was , maybe you have two or more doing the same thing ,

just a throught , oh and it did get progressively worse too
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