The reason I asked is that I just got my built engine and my brother was concerned that the rod weights (Number on the rods in grams) is different on all cylinders. They are 272, 265, 292, 301 respectively. I guess my questions are:
How is the engine balanced?
Is this OK to have the rod weights like this?
Are all Honda engines balanced the same?

This is a D16z6 by the way if it makes any difference.

Thanks for the help.

 

If you are building a high performance engine and want it balanced, or just a stock rebuild but nicely balanced, those numbers will not work.

To balance a rod, a balancing shop will weigh the rod on a special scale and machine material off both the small end and big end to make them all the same weight. Normally taking the weights from the lightest small end and the lightest big end and machining the rods to match that number. Normally the pistons are also machined to the same weight, and then the crank will be balanced depending on the end result of the mass from the rod and piston weight.

-Marauder-

 

wtf, are these the stock rods you using?

seems odd that the rods are weighting different that would mess up torque numbers -- or if honda actually did that on purpose for the HP numbers on stock cars and reliability.

 

they balance it as a recipericating mass not individual parts

so this means that everything that moves gets balenced together, IE rods with pistons on them! (recipericating mass)


Rob

 

The local shop does it like this:

1) You bring in your pistons, rods, wrist pins, clips.
2) The pistons are weighed. 1 piston is usually lighter than the rest. Material is removed from the heavier pistons so that all pistons are the same weight.
3) Step #2 is repeated for the rods.
4) The pistons/rods are put together and then weighed. The shop then gets a weight that matches this number and clamps that weight to all 4 of the crank throws.
5) The crank pulley is bolted to the front of the crank.
6) The flywheel and clutch are bolted to the rear of the crank.
7) The whole assembly is spun around in a fancy crank balancing machine. Material is removed from the crank counterweights and/or the flywheel and/or the flywheel bolts to get things balanced.

Sonny

 

i don't believe so there buddy. what was said above was a great post and is exactly how it's done


[Modified by poison, 7:23 PM 7/24/2002]

 

your right my Father isnt a machinist


thats how he has allways done it
Cranks as well. doesnt mean there isnt different methods...BUDDY

 

that my freind is a reciporactaing mass!!!! read it a bit.

Rob

 

It sounds like it was done right then. It is a D16Z bored to 1.8L with JE Pistons, Eagle Rods, Iron Sleeves, etc. The counter weights have places where they drilled to make it even it looks like. Although, the rod weights still are different unless there was material I can't see taken off. I don't have a way to check the pistons either since it came assembled. If it is balanced as a whole unit, does it matter on the rods?

 

you are good man! every thing is cool!


[Modified by rjardy, 11:52 AM 7/25/2002]

 

Are we confusing balancing V-8's and 4 cyl engines? Pistons and rods are balanced the same way in both engines but cranks are not. With a V-8 you bolt corresponding weights onto the rod journals when you spin balance the crank. With straight 4 cyl Hondas you get the same balance whether you bolt weight on or not because the rod journals are 180 degrees opposed to each other. Most balancers do not use the weights on 4 cyls.
Although some balance shops may balance a crank with the clutch anded flywheel on the crank, IMHO it doesn't make sense. That would mean that everytime you change your clutch or put a different weight flywheel on, you would throw your engine out of balance. Would you want to tear your engine down to rebalance the crank every time you changed clutches? The flywheel should be balanced seperately.

 

guess what? it IS weighed individually and balanced.......read THAT a bit.

and i know there is different methods, BUDDY, however this is the most common one.

I rest my case.


[Modified by poison, 8:01 PM 7/24/2002]

 

Ok, ok, dont everyone get thier panties in a bunch now....

 

haha just throwing hammers back, that's all

 

well i hope you feel better....

and i was thinking v8s sorry, i thought it was asll the same. sorry about the 's but were still n ot BUDDYS

 

ohh, not buddies huh. well i hope YOU feel better.

and v8's are a pain in the *** and a half, and they end up blowing up anyways


[Modified by poison, 8:34 PM 7/24/2002]

 

tru Screw a v8 that was so highschool

did that sound GAY?


Rob

 

haha, i sure hope it wasn't, otherwise im glad im not ur buddy

 

HEY HEY we all have skeletons inour closet! i had a mustang (66) with a 351 windsor. it was quick and fun, but i was young and dumb! needless to say it got me in allot of trouble and now i dont have it any more!


Rob

 

haha, it's ok, u own a honda now right? if u do, you are blessed with Honda over Ford

and yes, I know, of you getting into trouble with the Ford (and also being broke for all the repairs you put into that 302 stroked/bored to 351 beast -- but unreliable beast)

if you own a honda, of it being probably slow as hell at the moment, i am in the hopes that if you BALANCE it the PROPER way (haha, not to bring this up y0) but you just might have more reliability and be able to push more horses into it huh?


[Modified by poison, 2:45 AM 7/25/2002]

 

Very interesting.

art

 

yeah i like hondas now, im in the military and in korea right now, so i dont have a car at the moment. but im thinking about getting another GSR when i get back to the states (in 3 months!!!)

Rob

 

wow..this is very interesting....

stan

 

why does everyont think that this is so interesting? becasue i made myself look like a dummy


Rob

 

VERY interesting...



what brand you in man?