I need some advise on a something on my 455. Are there any 455 engine pros out there near 21074? I'm trying to see if something is normal or not.
Just put it on here, I'm sure someone can help you. Is it something needed to be seen or heard in person?
The kind of thing that needs to be in person. The engine runs great, smoooooth idle and excellent oil pressure. The engine is quiet until the engine warms up and the oil thins out and the sound like a a rattling noise.
As you may know I'm a audiophile, my 455 sound great playing from a Pioneer Processor with 2 Velodyne FR1800R sub woofers and 4 K5.5 Klisch towers.
I used to - now I just play one in the garage Nice collection of speakers you have there! I have a Klipsch sub and rear surrounds, to go with my now ancient ARs...
Once the noise takes place shut the motor down and then pull off one plug wire at a time and then restart it and see if the noise changes. You might also check to see what condition the timing chain and gears are in. Pull all the plugs, remove the Dizzy cap and rock the Crank back and forth by the balancer, the rotor moving should follow the Crank movement closely! If you have more then 6 degrees of rotor lag either way then it's time for a chain and gears as the chain slapping around could be the source of your noise if your lucky, which is far better then a Bearing or piston or wrist pin issue!
It's a rotating like sound. It is not one one cylinder. I'm thinking excessive bearing clearances and oil as it gets thinner splashing around. The oil pressure because of the TA Performance pump works well. I have a new 10-10 455 crank and bearings and thinking of going that route. The engine spun one of the crank bearings when I first got the car and had the crank turned and installed new bearings. Think this may be what is going on here. I may try the impossible and try replacing the crank with out pulling the heads, I did it on a V6 Buick once. Quiet on start up and come around when the engine warms up.
Are the Velodyne FR1800R sub woofers 18" speakers??? There are two guys "near" you - Bruce Wilson (BQUICK) is still active and Mike Pollack and he's CarCrazy455 but I haven't heard from him lately.
If you have good oil pressure, even hot, get yourself a stethoscope (or even a long bladed screwdriver) and listen to various spots around the engine. Valve covers. Front cover. See if you can determine where the change in sound is coming from. Yanking the crank is the last thing I’d want to do ;-)
A piece of heater hose makes a good stethoscope. Worn rockers and shafts can make a rattling noise similar to a diesel engine, the 1970 versions are bad for this even with low mileage. A wise mechanic once told me always check the simple stuff first. it's a lesson I had to learn several times before it stuck!
Without hearing it, it wouldn't surprise me if it was lifters. What cam and lifters are you running? Which oil are you running?