Piston rings measure

[LM 25575]

Hi,

some weeks ago I bought a set of piston rings for my car. By the moment that cylinders were not re-bored I ordered standard size. Yesterday I got the rings and...they are too big. Now, I think that the dealer sent me the wrong ones, even if on the box there is a label saying STD which I think means standard, but probably they are for another car. I have been asking to the vendor what is the problem and I am waiting for a reply.
But, in the meantime, can someone of you recognize the kind of rings I got? Complete label says SRH 4236 STD. The strange thing is that there is another writing, erased, which says P2339.30.

Thanks and Merry Christmas to all of you!

Luca

[Sweede64]

Too big? Does the ends come togehter? If not, how much gap is there? Messure in the bottom of the cylinder.

[LM 25575]

Too big? Does the ends come togehter? If not, how much gap is there? Messure in the bottom of the cylinder.

They do not fit into the cylinder..

[Jeffrey Burland]

Hi Luca,

P2339  are 'Grant' brand rings for a 331. Bore diameter 3.813" (96.84mm), Ring size -  8 - 5/64" (Compression),  8 - 3/16" (Oil)
SRH 4236 STD seems to be Egge's part number for this same product.
HTH, Jeff

[LM 25575]

Hi Luca,

P2339  are 'Grant' brand rings for a 331. Bore diameter 3.813" (96.84mm), Ring size -  8 - 5/64" (Compression),  8 - 3/16" (Oil)
SRH 4236 STD seems to be Egge's part number for this same product.
HTH, Jeff

Yes, both codes appear on the box, which is Grant brand. I was wondering if the Grant one (erased) which is P2339.30 means that they are piston rings for re-bored engines. 

[Roger H]

many new rings are "file fit", 
I just installed new rings and pistons in my v12 and the rings I got needed to be custom ground for proper end gap.
they are shipped .005 too large.
Check with the ring manufacturer to see if they are wrong or file fit rings
i

[LM 25575]

many new rings are "file fit", 
I just installed new rings and pistons in my v12 and the rings I got needed to be custom ground for proper end gap.
they are shipped .005 too large.
Check with the ring manufacturer to see if they are wrong or file fit rings
i

But how did you do with oil ones?

[Dave Shepherd]

But how did you do with oil ones?

File to fit rings are normally used for racing applications when this occurs the oil rings are sized to the size bore or overbore and are not file to fit., If you file the rings you have more than a slight amount they will not usually fit the bore properly as the circumfrence does not match the cylinder wall, so as mentioned confirm what you have there. A .005 over ring in a stock bore can be file fitted, no larger though.

[Wayne Womble 12210]

P2639.30  Would indicate .030 over size.  Should be 3 13/16 std.bore. 

[Roger H]

On my set the oil rings  needed no filing, aparently they could handle the fit with no adjustment

however  .030 sounds like the wrong set

[Sweede64]

They do not fit into the cylinder..

Fit in the cylinder?  You must compress them first, when in place messure the end gap.

When i did my 390" no fililing was necessery just push the ring down in the bottom of the cylinder and check the gap.

[The Tassie Devil(le)]

Use a Piston without rings to push the ring down the bore, and only need to go down 1".

Using the Piston, keeps the ring square in the bore.

Bruce.

PS.   Go down too far makes it harder to reach down and measure.

[Sweede64]

Use a Piston without rings to push the ring down the bore, and only need to go down 1".

Using the Piston, keeps the ring square in the bore.

Bruce.

PS.   Go down too far makes it harder to reach down and measure.

Bruce, i allways measure in the bottom of the cyl. if its worn and not bored it will be the least worn part of the cyl. for the reach, measure from the crank side.