I did a Google search, and another search here, but didn't find anything.

I would like to know as with new pistons, and rods I will need to balance everything.

 

https://my350z.com/forum/engine-and-...n-general.html

 

Thanks, good info. Also, looks like your just north of me in TN.

 

M-train, to answer your question directly, your Z is internally balanced. (Some older engines had an extra counterweight built into the external harmonic damper hence they were externally balanced). The link Carfreak provided is a 14-year-old discussion by the OG forum blowhards regarding under-drive crank pulleys and such. This doesn’t really apply to you. By possibly changing the weight of rods and piston assemblies you may be changing the balance factor of your engine.

To explain in a nutshell, all engines have counterweights on the crank to balance out the weight of the crank pins etc and put it in rotational balance. On inline and flat engines the reciprocating parts (rods pistons rings etc) tend to be in natural balance as one at the bottom of its stroke counterbalances a piston at the top of its stroke. Most V engines don’t have this symmetry, so some adjustment to the crank counterweights must be made. This will only put the engine in perfect balance over a portion of the RPM range. A family sedan will be tuned for the RPMs used at cruising speed; a racecar will be set up for high RPM work.

Google “balance factor” for an explanation of how to weight your new rods, pistons and compare them to your existing ones and what subtle changes this may make in your engine’s balance factor.

My dad was a machinist and fabricator and did this kind of work on exotic old racecars and obscure antique cars. Even though he could make any missing or mangled part and could figure the formulas for balance factors etc on the back of an envelope, he was somewhat illiterate and would only write up a simple bill for his services. Another small shop owner showed me how to write up much more itemized bills. I made it my business to learn the name and function of every arcane nut, bolt and part in order to make a much more impressive looking repair bill. Hence my simple and superficial knowable of this kind of thing.

 

Thanks Jennifer. I've been building engines for over 35 years now [wow, time flies], and its always good to know what your working on.

This engine is new to me, and actually the car I'm working on is an Altima SE-R.

However, there isn't much wrenching going on with this engine at the Altima forums so I came here for a little insight.

Here is one of my creations.

 

Wow M-train that’s a box chock full of turbos. Also, lots of fine fabrication back there, I even see a watts link.

 

Yep, almost NOTHING performance is made for the Mazda B series truck [and there should be as at 85hp its a real turd].

I had to make all of the suspension, front, and rear, all of the turbo stuff, rack/pinion steering, and probably the only B series truck with 14" front brakes..............lol.

I'm getting into my late 40's, and have learned a few tricks along the way, the Mazda B was a snowball I sometimes wish I never started rolling...lol. Oh, and that is an 03 Ford Ranger front body setup with an 86 Mustang SVO hood scoop.