zapp168

iTrader: (7)

Hey,
We got a 6.0 iron block 415 stroker from Schwanke. We re-used the head / cam from the 5.7 (Patriot heads and a 588 / 224 cam). Were looking for a quiet daily driver.
Here is the issue, start the car and it sounds fine, drive it say 2-3 minutes and suddenly it sounds like the motor is rapping (Oil preasure stays put at like 75 PSI) Drive like 1 more minute and noise DISAPPEARS! I mean drive it another 100 miles and it is silent and smooth. The noise won't come back until the motor is completely cooled and re-started, then the same thing over again. We have checked a few things, but I would rather not cloud your opinions at all. So please...let them fly.
Thanks!

koolrayz

iTrader: (26)

Sound like a lifter? Have you isolated the area the noise is coming from?

zapp168

iTrader: (7)

Maybe a lifter, however they are all new, The noise can be heard loud in the car, it is much quieter under the hood, but slightly louder underneath the car. It is loudest inside. It is hard to pinpoint, it stops almost as fast as it starts

zapp168

iTrader: (7)

Ever feel that you get all the sucky problems?

Whistler

iTrader: (46)

Perhaps check the windage tray to be sure the stroker crank counterweights arent grazing it?

butler

Maybe an exhaust leak that quiets down after things are all heated up? Could be a very small leak. Thermal expansion.

Q8-TECH

are you familliar with piston slap? it could be just that, thena gain it could be anything.
a good thing would be to find which are it is comming from then we could be of better help

IROC403

iTrader: (2)

Unfortnatly its my car It sounds like the windage tray hitting but it comes and goes which is weird?? but its about the only thing we didnt take appart to check so far. I guess thats next. thanks for the replys, Ill keep you posted when we find it, Ken

HPfreak820

iTrader: (3)

+1 on piston slap... Is this a forged setup? 2618 pistons will slap until they heat up and expand in the bore. This is perfectly normal. One way to cure piston slap is to have an offset pin bore in the piston...

IROC403

iTrader: (2)

It is forged but this noise is way to loud, I do hear the slap on cold starts but thats not this noise. Its hard to explain, metal on metal death banging LOL

redsilv

just a thought, cracked flywheel?

Schwanke Engines

iTrader: (1)

what head gaskets were used?

ramairws6

iTrader: (33)

Ouch..........here we go again

jmdgto

bent piston skirt. i had that problem. the noisy went away when warm. eventally it will not go away. then a new engine . that happened to me with an engine from epp. they did not back it up.

IROC403

iTrader: (2)

FOUND IT !!!!!! the front rod bolt was touching the oil pan , just barley scratched it, but what a loud noise LOL, thanks for all your help guys

Schwanke Engines

iTrader: (1)

Glad you found it. Make sure to torque it again just to make sure it stayed tight. Thoe F-body pans get really close in the front.

IROC403

iTrader: (2)

Put it sll back together and its no different,I thought for sure that was it. A local engine builder thinks its a tight wrist pin,making a piston slap exssively then the piston expands and stays quiet, ?? I dont know,I think ill park it before i drive it off a cliff LOL

ramairws6

iTrader: (33)

Looks like another post went 'POOF'....................

ramairws6

iTrader: (33)

Well.................any updates on this??

SPDMETL

Aint broke...don't fix it !