TRW L 2322.030 Piston measurements.

[1Fast340]

Out of curiosity,how big piston to wall clearance should those ancient L2322 .030 pistons realy have?
Anyone have a set that are not beat to death that they could measure the diameter both top and bottom?
No need to rush or go out of your way for it,just if you have them within easy reach or have the numbers close by so to speak.

 

[nm9stheham]

FWIW, .0035-.004" has always been the typical cylinder-to-bore clearance for forged in this type of bore size, with maybe another .001" if you are putting a lot of power and heat on them. I've had some forged TRW's in the past where the data sheet included with the new pistons listed less, but IMHO you had better have the bores really right, with things like torque plates in place, as well as things like bellhousing bolts in place and torqued, when boring and honing, if you want to get by with a tighter clearance.

Sadly, I can't recall where to measure them, up by the pin or near the bottom of the skirt.

 

[brian6pac]

.004-.006, .004 is on the tight side if you ask me, I would run .006, if it runs hot it will scuff with .004

 

[yellow rose]

Measure the piston and subtract that number from nominal bore size. That's how much the minimum clearance should be.

If that's the domed piston I have some in the shop and I can measure one later.

 

[perfacar]

according to speedpro, clearance is measured up on skirt about 1/2" from tip. actually even with the bottom of main piston body. they call for .005 clearance. that usually is a min clearance.

 

[MOPAROFFICIAL]

Can run them up to .008

 

[1Fast340]

Measure the piston and subtract that number from nominal bore size. That's how much the minimum clearance should be.

If that's the domed piston I have some in the shop and I can measure one later.

They are the domed pistons,or used to be before someone cut down the domes.

That would be very nice if you could do,if you dont mind measure above the topring,and further down at the correct height for measuring
Absolutly no rush at all this is just out of curriousity,i have 8 of those pistons that have been in some serisously worn out bores and has been thru a couple raceengines since the mid 80´s or so and just looking at them sitting in some fresh bores its obvious that they have been slapped around enough to actualy become smaller and appear to have lost more size at the top
so would just be intresting to know by how much compared to how they are supposed to be sized.
They have ridicules clearances to say the least and im surprised they didnt expire considering that the block they lived in cracked 2 bores.

 

[dibbons]

My engine builder just finished putting together my .030 over motor with the L2322 pistons. I wanted more, but he used .005" which is probably right. I did use more than .005" back in the day on my bracket racing motor though.

 

[Gunnar Eriksson]

Out of curiosity,how big piston to wall clearance should those ancient L2322 .030 pistons realy have?
Anyone have a set that are not beat to death that they could measure the diameter both top and bottom?
No need to rush or go out of your way for it,just if you have them within easy reach or have the numbers close by so to speak.

 

[Gunnar Eriksson]

hej jag har sådana beg kolvar till min 340 motorrenoveraren vill veta måtten på kolvarna när dom var nya kan du ha fått dom måtten när du ställde frågan ang kolvspel mvh Gunnar ring gärna om du kan 0703171757

 

[stixx]

Now that's a reply everybody can understand


...or I could say: that's an english speaking forum and not a blog

 

[Max1196]

From the skirt and moving up, new .030 over
4.0688 thou. very bottom
4.0685 thou. half way up skirt
4.0680 thou. just below oil ring grove
4.0365 thou. between 2nd ring and oil ring groves
4.0391 thou. top of piston above top ring land
photos to follow after work

 

[Max1196]

pics.

 

[Gunnar Eriksson]

pics.
View attachment 1715346229 View attachment 1715346230

Thanks alot for your answer, but this is not the TRW 2322 dome pistons , is it TRW forged pistons?

 

[Gunnar Eriksson]

Measure the piston and subtract that number from nominal bore size. That's how much the minimum clearance should be.

If that's the domed piston I have some in the shop and I can measure one later.

Hi! do still have some of this piston in your shop so you can measure them for me

 

[Gunnar Eriksson]

They are the domed pistons,or used to be before someone cut down the domes.

That would be very nice if you could do,if you dont mind measure above the topring,and further down at the correct height for measuring
Absolutly no rush at all this is just out of curriousity,i have 8 of those pistons that have been in some serisously worn out bores and has been thru a couple raceengines since the mid 80´s or so and just looking at them sitting in some fresh bores its obvious that they have been slapped around enough to actualy become smaller and appear to have lost more size at the top
so would just be intresting to know by how much compared to how they are supposed to be sized.
They have ridicules clearances to say the least and im surprised they didnt expire considering that the block they lived in cracked 2 bores.

Hi ! did you get any information about the diameter of the pistons?

 

[Max1196]

Yes the TRW piston, part # L2316F .030, should still give you a clue as to what the forged TRW spec would be.

 

[Gunnar Eriksson]

Yes the TRW piston, part # L2316F .030, should still give you a clue as to what the forged TRW spec would be.

Ok thank you

 

[yellow rose]

Hi ! did you get any information about the diameter of the pistons?

Yes, I still have them. I lol go dig them out this afternoon and measure them for you.

 

[Gunnar Eriksson]

Yes, I still have them. I lol go dig them out this afternoon and measure them for you.

sounds great thank you

 

[yellow rose]

sounds great thank you

I'm on that this AM.

 

[Wyrmrider]

you get the good guy award YR

 

[yellow rose]

Ok, here are the measurements from some brand new Pistons I have on the shelf. These are NOS stuff from maybe the very early 1980's. IIRC, the newer off shore made TRW stuff has much tighter clearances.

4.0620
4.0625
4.0622
4.0625
4.0623
4.0622
4.0623
4.0622

At those numbers, the minimum clearance is (I always set clearance off the biggest piston) .0075 and then the some will have .0077, .0078, .0079 and one with .0080.

When I was younger I'd have honed all the holes to fit. Now, I'd set it to the big piston and run it.

New Pistons will never see that much size difference anyway.

 

[Gunnar Eriksson]

Ok, here are the measurements from some brand new Pistons I have on the shelf. These are NOS stuff from maybe the very early 1980's. IIRC, the newer off shore made TRW stuff has much tighter clearances.

4.0620
4.0625
4.0622
4.0625
4.0623
4.0622
4.0623
4.0622

At those numbers, the minimum clearance is (I always set clearance off the biggest piston) .0075 and then the some will have .0077, .0078, .0079 and one with .0080.

When I was younger I'd have honed all the holes to fit. Now, I'd set it to the big piston and run it.

New Pistons will never see that much size difference anyway.

Hi! Thanks alot, realy nice of you

 

[yellow rose]

Hi! Thanks alot, realy nice of you

No problem. Sorry it took so long.