patsmx5

iTrader: (16)

That's the question. Looking for the mass of a stock 1.8 piston or the mass of a forged piston. Playing with some numbers and need to know the mass. Thanks.

iWeasel410

1.8L forged 2618 is just about 300 grams.

patsmx5

iTrader: (16)

What brand piston is that? You get that from somewhere or measure it yourself?

NA6C-Guy

iTrader: (1)

Damn, that reminds me I meant to weigh some parts while I had them out and apart, but forgot. I never did seperate the rod and piston though, but could have given a combined weight. Dont guess even that would have helped though. Id like to see someone doing a rebuild do a full weight list for us Miata guys. Maybe I will do that next time.

Joe Perez

iTrader: (8)

Is that with or without the quarters?

deliverator

iTrader: (14)

Gotta be wiithout. If you're getting forged pistons, get them with the right CR.

Quarters are only needed for stock pistons, man.

TURNS101

iTrader: (10)

While we are on this weight thing, how about stock 99 rods??

patsmx5

iTrader: (16)

Sure, the weight of the stock 99' rods would be nice too. Go pull one out of your oil pan and weight it.

iWeasel410

That's the JE stocking shelf part. If you want the weight with locks and pin, just ask.

patsmx5

iTrader: (16)

Asking.

TURNS101

iTrader: (10)

I like that LOL!!

KMag

iTrader: (2)

The last 1.8 I built, the pistons, wrist pins and rods weighed as follows in grams. It was 95 engine.

#1 = 283.4, 78.8, 573.8

#2 = 286.6, 78.9, 573.3

#3 = 287.6, 78.8, 574.8

#4 = 292.1, 78.9, 573.5

I hope this helps.

KMag

patsmx5

iTrader: (16)

Thanks a million!

KMag

iTrader: (2)

Sure thing! One thing to note is the difference in weight in the cast pistons, almost 10 grams from the lightest to heaviest. It took a lot of work to remove 10 grams from #4. I believe that got all of them within 1/10 gram of each other.

KMag

iWeasel410

Forged 2618 pistons with wrist pins and locks are just shy of 380 grams.