Thanks John for your insight points well taken. I am going to buy new lighter pistons and not worry about how much metal would be left. Its not all that expensive for a set of 8. Reducing the reciprocating weight and all cnc matched is not such a little thing as well.Hello Moparfriend,
I have done this with 360 forged pistons in a 340, 1972 engine myself.
But I was taking an 11 to 1 down, nearer to 10 to 1.
A 12.5 to 1 pistons is way too big for a street engine I would say?
With aluminium heads I would stay under 11 to 1.
But with iron I will NOT got over 10...
Very few piston domes are solid so its a lottery how much you can remove?
Sell the 12.5's and buy the correct ones for the JOB!
Dome head pistons are 'old school' technology these days anyways...
They hurt the flame travel across the piston and a FLAT top piston, is much more desirable.
Squench technology is the 'new kid on the block'...
Actual compression is not known but these domed pistons are 12.5:1 based on the heads I have. Way to high for iron heads and shitty fuel in Phoenix. I am shooting for 9.5:1 but also thinking of slapping on some aluminum heads if so then I will go to 10:1
Hey Bearman have you had any work done there? They look like a general machine shop as opposed to an engine building shop. I am gonna probably need a bunch of work done on the bottom end and block to get the refresh done right.
Ok... so here's a thought. IF you're going to aluminum heads, you can tolerate a bit higher compression. Me ? I'd do an actual CC of the combustion chambers, and then see what a change to aluminum heads with a slightly more volume chamber affects your CR.
Yes i have had work done. Please call them and talk over everything you need and want. I can say that nothing is done second class. The do alot of military work i have not yet had a engine done but i hope i get to very soon.
You know he moved to Colorado! I went to see him over a year ago. He was packing up the shop!
What does “overbalanced” mean?
I new he was doing alot of racing up there but i haven't been in touch with anybody in over a year. The covid thing put a stop to that. Now getting back into it will find out who's in and who's out.
Yeah I was bummed he was old school and reasonably priced for machine work. Still is if you visit his website.
Balancing to a 51-55 percent factor as opposed to the standard 50 percent, it's supposed to be a little smoother at high RPMs. In a close to stock bob weight Mopar, you would never know the difference between 45-55.
Less stress on the rods, yes, rev quicker, nothing measurable.
Buy a new set! Those pistons are sweet!
The 512ci Big-block in my avatar picture will only rev to 6000rpm, HOW LAME is that...
