Hello guys.

The engine is 86x89
ITBs
vtec killer custom cams.
long rods
custom over deck 16:1 pistons by JE
deck plate
~1,75 rod/stroke ratio.
The engine will rev around 10500.
It will be a race only engine and its 90% ready.


The question here is about piston pins.
The pins that came with the pistons are 21x67,7mm and
weight around 105 grams each.They look too beefy probably for
forced induction.
Is there a known off the shelf lightweight pins that will hold 300whp
but 70-80 grams?

Whats your opinion on this anyway?What pins you use?

Thank you for your time.

Edit:Some images.

 

Yes you can change pins. What brand is the piston

 

Pistons are custom made by JE.
Pins are 21 x 67.5 mm.
Any ideas?
thanks for your time.

 

My opinion is, I think it's a great idea to reduce weight that the motor has to turn/push wherever you can (except the flywheel, depending on application). In fact it's the philosophy I will be building my motor's final version around. I didn't even think of lighter pins, good idea

 

Bump for some ideas.

 

And soμe pictures of the beautifull pistons.

 

I am in the same boat with my Arias Pistons, my pistons came with .827x2.350x.200" pins, case hardened .015-.020". 8620 material, surface hardness 57-61 Rockwell "C"

I checked their website, as well as emailed Arias to check my options. So your best bet is to check your piston manufacturer's website, call, or email.

I bought .827x2.35x.120" pins, heat treated 100%, 52100 material. My build is much milder than yours, but still very unconventional (n/a nonvtec).

 

correct me if I am wrong here, but the pins dont know anything about power. much like a rod bolt. the stress they encounter comes from RPM. I used STD piston in my H series engine two years ago and that was a big mistake for a 10krpm engine. i had maybe 20-25 passes and a couple dyno sessions on it and i could remove the pins from the pistons they were so bent.

 

If you don't mind me asking, where did you purchase those?

 

True, pins can become bent many different ways, the pins that came with my pistons were "medium duty" according to Arias, the new ones I ordered are "Heavy duty". The material they are made from, the amount of heat treating they have, and the thickness of the walls all have something with the application obviously. I was asked how high I planned to rev my engine, and was told if more than 9k the thinnest I could go was .160" with 8620 material, and .120" with the 52100" material. So I went with the lighter option.


I bought my piston pins from Arias, as my brand of pistons is Arias. Now as far as which part number will fit other brands, is a guessing game, just have to know the specs of yours, and what you are looking for.


My new pins finally arrived

Old pin weight 87g. New pin weight 76g.