How much material is needed to take 14 grams from a piston?

Or would it be easier just to get the assembly rebalanced????

Thanks

14 grams is gigantic. Most pistons will take about 2-4 grams safely. Some of the old TRWs can take more, but many will argue what is a safe limit, and at what point are you doing more harm ( stress risers) than good. I myself stop at about 5 grams, and even at that, some pistons ( many of the strokers now) arent worth even touching.
Most newer modern pistons come in finished within 2 grams across the board.

You may be able to find a lighter wrist pin like in H-11 and take the weight out there .

14 grams would not be suggested.

Thanks

Ive a stroker kit im changing pistons on and thats the piston weight difference...

Looks like the smart (best only) way is to do it right and get a rebalance....

I will look into the pin option as well.

Thanks again!

Depending on what rods you have, you might be able to get 14g off the small ends of the rods too...

I've done this before when I had to replace an old out of date piston with a new one. The new piston was heavier, and I couldn't get enough weight out of it. I ended up grinding the small end of the rod and it worked out fine.

If you must, 14 grams is easy to get out of a piston.

Send them to Eric Henke @ Rebco Machine

316-440-2828

He machined almost 100 grams from these pistons. (solid dome)

Besides cutting most of the dome off, internal milling and
the 2 pockets visible here, if you look through the pin bore,
you can see where he milled above the pin on the inside.

Obviously, short pistons are more of a challenge.

It ALL depends on what type of piston it is.....

A current Diamond/Wiseco race-piston ? .... 14 grams ? ... NO way ... not likely.

A OEM cast/forged old-school ..... NO problem.

Diamonds are pretty beefy. Been a while since I had ahold
of a Automotive Wiseco. The one in my picture is a JE.

I wouldn't use a forged TRW to chock my trailer from rolling over the hill.

It does depend on the piston.

Vic,

I agree , anything is possible, but I am doubting you'd wnt to remove 14 grams from a normal small block piston. ( I am making an assumption here about what 77 R/T is working on)

If you are doing a normal balance job ( which again is what I am talking about) you know a balance keyway style cutter isnt going to find 14 grams very easy in a SB stroker piston. Obviously you could ball mill some etc, but again, I am quite certain that isnt where he is headed here.
A 100 gram change is basically a total piston re-work. IE: Taking one piston and making it into another or a maximum lightening effort, which then lends me to wonder about piston strength.
As you know, there will be a balance between cost/sensibility and strength. Pick any two...lol.

For the record, what did it cost to take 100 grams out of 8 pistons? Also, what was trying to be acomplished with those and why did they need to be done in the first place?

I'd rather change wrist pins than take a crapload of weight out ( within reason). I know Diamond and I went round and round about this before, and they still like to maintain some strength as opposed to cutting the piston up too much. I can see it in NASCAR where they frequently change ( and can afford to) pistons etc, but I'll exchange a little beef for longevity anyday.

Just my and opinion

You'd see about 200 grams difference between something similar in a new style piston vs the TRWs. ( assuming flat top vs flat top) Thats considerable.That being said, for years people beat the hel* out of old heavy TRWs and they lived. Would I want to use them? No.Does that mean they are junk? No. Just a matter of budget vs expected results.

Todd.......IIRC it was $148.00 +shipping (4 operations)

I know what you are saying. I didn't mean 14 grams with a die-grinder
weight match. That's why I started with "If you must......"

About 4-5 grams is all I care to take of the pin bosses to weight match.

Doc........Safe limit is a loaded question. I buzz my stock stroke 340
engines pretty good so, no TRWs for me.

Mopar pistons are notoriously heavy to begin with and TRW didn't do us
any favors in the weight department.

TRW did offer shelf pistons for us Mopar guys, when there was only
custom "West Coast" pistons, otherwise.

If you require a lightweight piston for that, it can be made.

I have a set of SS 340 pistons that are extremely light.

That is very reasonable then for that weight removal.
About the same as new pins. Again, I think it needs to be a piston with that much material that can be removed.

Thanks.

I took 200+ grams off TRW l2215fs for a 383. I milled the tops down .2" for a stroker engine build. That was 15 years ago. The crown was .490" thick in the center before milling.

I ve got some old TRWs that have the skirts cut, profiled inner skirts, cut valve reliefs, removed underhead etc, and I got about 160grams out, but that was almost 20 years ago now. There were no options then. Amazing what good old ingenuity could do when we had no choices huh?

I did a BBC 2 years ago that came in with bearing issues. I told the owner " you have a balance or crankshaft problem" after just looking at the bearings. He did not know the whole history of the motor other than it "did not have that many laps on it". After tearing down, checked pistons, all were Ross domes, but two were a bit different forging. I took them off and found the problem. Same part #, different weights. they were each almost 28 grams different than the other 6. The guy that put it together never wieghed them, and just ordered the same part number, dome configuration looked the same, so he just threw them in. I took all the wieght out I could, swapped for lighter wrist pins and been running like a champ.

14 grams is about .32 cubic inches; 4 holes 3/4" ID by 3/16" deep, etc.