Richard Le
New member
The BRC pistons in my engine are very noisy and don't quiet down until after five miles of driving. They slap and sound awful at startup. Is that considered normal for these pistons?
Noisy BRC Pistons Normal?
- Thread starter Richard Le
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Richard Le
New member
Re: Noisy BRC Pistons Normal?
I know the pistons are 20 over and have total seal rings. I'm not sure about the clearance. Five miles of driving seems a little excessive to me. I thought forged pistons suppose to quiet down after half a minute or so.
I know the pistons are 20 over and have total seal rings. I'm not sure about the clearance. Five miles of driving seems a little excessive to me. I thought forged pistons suppose to quiet down after half a minute or so.
13.robb
New member
Re: Noisy BRC Pistons Normal?
My engine Has wiseco forged pistons and I also have The "cold knock " from the pistons for the first few minuites. I usually just start it and let it run for 5 minuites before i drive. I was also concerned at first, but the noise hasnt changed in about 3k miles. I talked to a few engine builders about this and i basically got the same info from all 3. They said most domestic vehicles with a modified engine with pistons, cams etc usually run headers or a very open exhaust thus covering up the knock noise from the pistons when cold. Also If you ever start up a ls1 engine and drive it before it warms up they are very loud like the syty engine with forged pistons and that is a production engine.
My engine Has wiseco forged pistons and I also have The "cold knock " from the pistons for the first few minuites. I usually just start it and let it run for 5 minuites before i drive. I was also concerned at first, but the noise hasnt changed in about 3k miles. I talked to a few engine builders about this and i basically got the same info from all 3. They said most domestic vehicles with a modified engine with pistons, cams etc usually run headers or a very open exhaust thus covering up the knock noise from the pistons when cold. Also If you ever start up a ls1 engine and drive it before it warms up they are very loud like the syty engine with forged pistons and that is a production engine.
Richard Le
New member
Re: Noisy BRC Pistons Normal?
It takes my truck around 20 minutes to warm up and the pistons to quiet down, and that's with a 170-deg thermostat. The TRW forged pistons I had didn't take this long to quiet down.
It takes my truck around 20 minutes to warm up and the pistons to quiet down, and that's with a 170-deg thermostat. The TRW forged pistons I had didn't take this long to quiet down.
NOJIMMY
New member
Re: Noisy BRC Pistons Normal?
Pardon my posting, but Richard ....
Its good to hear from you.
Hope your doing fine :tup:
Im betting people can still eat of your engine
(as its probably cleaner than most restaurant kitchens).
-Larry (and Claire) Brown
Pardon my posting, but Richard ....
Its good to hear from you.
Hope your doing fine :tup:
Im betting people can still eat of your engine
(as its probably cleaner than most restaurant kitchens).
-Larry (and Claire) Brown
JSM
Active member
Re: Noisy BRC Pistons Normal?
Larry you know better, Richard would never let anyone eat off his engine, the acids in the food would pit the chrome plating.
On a side note, Richard next time I am out your way let me throw some magic pixy dust inside the ECM and make it run right for you.
Larry you know better, Richard would never let anyone eat off his engine, the acids in the food would pit the chrome plating.
On a side note, Richard next time I am out your way let me throw some magic pixy dust inside the ECM and make it run right for you.
turbodig
Active member
Re: Noisy BRC Pistons Normal?
My TRWs don't either. Different manus tend to specify different skirt clearance... and if the builder is on the conservative side, he'll add an extra .001 for a bit of cushion.
Skirt length also plays a part in this, as a longer skirt piston will make a bit less noise.
It's annoying, to be sure, but it won't hurt anything. If anything, you can rest easy that you aren't as likely to gork a piston if you ever run into an overheat condition.
My TRWs don't either. Different manus tend to specify different skirt clearance... and if the builder is on the conservative side, he'll add an extra .001 for a bit of cushion.
Skirt length also plays a part in this, as a longer skirt piston will make a bit less noise.
It's annoying, to be sure, but it won't hurt anything. If anything, you can rest easy that you aren't as likely to gork a piston if you ever run into an overheat condition.