2.4 Bridgeport piston ring numbers

**AUS racer** · 01-18-2017, 11:44 PM

Would I be correct in saying that 2.4 Bridgeport piston ring part number is 39-44395A12
This is a nikasil block running Mahle Pistons.

Is this this the same part number as a Chrome bore/oval port 2.4?

**gmjim** · 01-19-2017, 01:36 AM

I might have some NOS rings I think, I'll see if I can find them and check the part no.

**Dave Strong** · 01-19-2017, 01:23 PM

39-44395A12 fits ser# B290010 thru C276611 and C276637 thru C276651. 39-816802A12 fits C276612 thru C276636 and C276652 and up.

Dave

**AUS racer** · 01-19-2017, 09:54 PM

Originally Posted by Dave Strong

39-44395A12 fits ser# B290010 thru C276611 and C276637 thru C276651. 39-816802A12 fits C276612 thru C276636 and C276652 and up.

Dave

And what bores do these serial numbers have Chrome or Nikasil.

**Dave Strong** · 01-20-2017, 03:22 AM

Originally Posted by AUS racer

And what bores do these serial numbers have Chrome or Nikasil.

Not knowing but would have to say first numbers chrome, second set NiC.

Dave

**gmjim** · 01-21-2017, 03:50 AM

The rings I have are 39-816802A12, I believe they are for Nik bores but can't be 100 percent sure

**AUS racer** · 01-22-2017, 05:33 AM

Can anybody give me a definitive answer. Im concerned about using the wrong rings and buggering the bores.
I have read use hard on soft and soft on hard, Soft Iron rings on hard chrome bores and hard chrome rings on soft nikasil/steel bores?

**Dave Strong** · 01-22-2017, 01:17 PM

Iron rings in nik and chrome, chrome rings in steel bores.

Dave

**AUS racer** · 01-24-2017, 05:45 AM

Anyone have an answer?
I still have no idea what rings to use on each bore

**BoomerMuskoka** · 05-06-2017, 10:30 PM

Originally Posted by AUS racer

Anyone have an answer?
I still have no idea what rings to use on each bore

DO NOT USE IRON RINGS IN A NIK BORE>>>>

**BoomerMuskoka** · 05-06-2017, 10:46 PM

just make sure the rings you use on nik are gold in color. ask the person selling them if they are gold,for nik iron for chrome or chrome for steel.

this isnt rocket scientology.

good luck.

**Dave Strong** · 05-06-2017, 10:51 PM

Originally Posted by BoomerMuskoka

DO NOT USE IRON RINGS IN A NIK BORE>>>>

Why Not?

Dave

**Dave Strong** · 05-06-2017, 10:54 PM

Originally Posted by BoomerMuskoka

just make sure the rings you use on nik are gold in color. ask the person selling them if they are gold,for nik iron for chrome or chrome for steel.

this isnt rocket scientology.

good luck.

Gold TiN rings are fine in some apps. Nothing wrong with iron rings in a lake boat.

Dave

**BoomerMuskoka** · 05-07-2017, 08:33 AM

Originally Posted by Dave Strong

Gold TiN rings are fine in some apps. Nothing wrong with iron rings in a lake boat.

Dave

they used to use chrome rings on nikasil bores (still do) but it is hard on the nik.. all the Tin (titanium nitride ) rings are chrome rings with TiN coating so again DO NOT USE AN IRON RING IN A NIKASIL BORE.. it will destroy your block. you could use chrome rings but would more than likely destroy your block..

**Dave Strong** · 05-07-2017, 10:27 AM

Originally Posted by BoomerMuskoka

they used to use chrome rings on nikasil bores (still do) but it is hard on the nik.. all the Tin (titanium nitrate ) rings are chrome rings with TiN coating so again DO NOT USE AN IRON RING IN A NIKASIL BORE.. it will destroy your block. you could use chrome rings but would more than likely destroy your block..

Wrong

Dave