Built Z Motors Machining Process Part II :BALANCING
Thread Starter
Sponsor
builtZmotors
builtZmotors
iTrader: (21)
Joined: Jul 2004
Posts: 2,780
Likes: 0
From: Albuquerque, NM
Built Z Motors Machining Process Part II :BALANCING
The Balancing Process
Balancing the rotating assembly is a crucial part in ensuring a reliable long lasting motor. The balancing refers to weighing all of the pistons and rods and making sure that they are all within 1gram in weight of one another.
The big ends of the rods are weighed using a rod support. The small ends are weighed in a similar fashion.
The weights of one rod, one piston, the piston’s buttons, one set of rings, and one set of rod bearings are all taken into account when coming up with the balancing amount. The balancing weight is the weight that must be simulated on each rod journal when balancing the crank.
Bob weights are then measured out to create 6 bob weights that all equal the exact weights of each of the rod journal components (abovementioned items).
The bob weights are made up of steel weights that have one hollow cylinder on either side. The cylinders can be filled with lead pellets to obtain the desired final weight.
The bob weights are all tightened down to each rod journal, perpendicular to the journal when it is in the most upright position (this is done to produce a baseline consistent pattern to fastening the bob weights to the crank).
The dimensions of the crank are imputed to the balancer and the crank is rotated.
The balancing machine will calculate which area of the crank needs to have material removed or added.
In this case, material needed to be removed only. The forged steel is delicately drilled away, gram by gram, until the desired balance is obtained.
We aim to balance each crank to less than .5 grams. (NOTE: non-performance factory cranks are typically balanced within 5 grams).
After the crank is balanced, all of the bob weights are removed and the crank is cleaned in a washing tank. The crank journals are then polished utilizing the following polishing tool:
The rotating assembly is now perfectly balanced and ready to begin the assembly process.
Balancing the rotating assembly is a crucial part in ensuring a reliable long lasting motor. The balancing refers to weighing all of the pistons and rods and making sure that they are all within 1gram in weight of one another.
The big ends of the rods are weighed using a rod support. The small ends are weighed in a similar fashion.
The weights of one rod, one piston, the piston’s buttons, one set of rings, and one set of rod bearings are all taken into account when coming up with the balancing amount. The balancing weight is the weight that must be simulated on each rod journal when balancing the crank.
Bob weights are then measured out to create 6 bob weights that all equal the exact weights of each of the rod journal components (abovementioned items).
The bob weights are made up of steel weights that have one hollow cylinder on either side. The cylinders can be filled with lead pellets to obtain the desired final weight.
The bob weights are all tightened down to each rod journal, perpendicular to the journal when it is in the most upright position (this is done to produce a baseline consistent pattern to fastening the bob weights to the crank).
The dimensions of the crank are imputed to the balancer and the crank is rotated.
The balancing machine will calculate which area of the crank needs to have material removed or added.
In this case, material needed to be removed only. The forged steel is delicately drilled away, gram by gram, until the desired balance is obtained.
We aim to balance each crank to less than .5 grams. (NOTE: non-performance factory cranks are typically balanced within 5 grams).
After the crank is balanced, all of the bob weights are removed and the crank is cleaned in a washing tank. The crank journals are then polished utilizing the following polishing tool:
The rotating assembly is now perfectly balanced and ready to begin the assembly process.
Last edited by 350zDCalb; Mar 28, 2006 at 08:00 PM.
the balancing process is pretty cool. luckily most of the pistons and rods going into these motors are of such quality, that not much matching needs to happen on those.
nice write up.
nice write up.
Thread Starter
Sponsor
builtZmotors
builtZmotors
iTrader: (21)
Joined: Jul 2004
Posts: 2,780
Likes: 0
From: Albuquerque, NM
Originally Posted by overZealous1
the balancing process is pretty cool. luckily most of the pistons and rods going into these motors are of such quality, that not much matching needs to happen on those.
nice write up.
nice write up.
the pistons were all well within spec to one another, two of the rods needed one gram removed from them to obtain identicle weights. They are extremely close, almost perfect, we are shooting for perfection
We are taking the additional time to ensure these motors meet the highest of standards!
Registered User
Joined: Nov 2004
Posts: 376
Likes: 0
From: tennessee
Man, it's killing me seeing pictures of you working with machinery with no eye protection. Norm (This Old House) Abrams is going to come get you! Take care.
Keep these write-ups coming. Good stuff.
Keep these write-ups coming. Good stuff.
Thread Starter
Sponsor
builtZmotors
builtZmotors
iTrader: (21)
Joined: Jul 2004
Posts: 2,780
Likes: 0
From: Albuquerque, NM
Originally Posted by bullseye
Man, it's killing me seeing pictures of you working with machinery with no eye protection. Norm (This Old House) Abrams is going to come get you! Take care.
Keep these write-ups coming. Good stuff.
Keep these write-ups coming. Good stuff.
that's not me, that's bryan, the machinist...I wear eye protection
, telling a guy who has been doing this for 25+ years isn't so easy
Originally Posted by 350zDCalb
the pistons were all well within spec to one another, two of the rods needed one gram removed from them to obtain identicle weights. They are extremely close, almost perfect, we are shooting for perfection We are taking the additional time to ensure these motors meet the highest of standards!
We are taking the additional time to ensure these motors meet the highest of standards!PS- when is your website going up? I've been curious about your prices since you first let us know you would be building.
Trending Topics
Thread Starter
Sponsor
builtZmotors
builtZmotors
iTrader: (21)
Joined: Jul 2004
Posts: 2,780
Likes: 0
From: Albuquerque, NM
Originally Posted by ht4
Where do you remove weight from con rods? I have seen balancing tabs (not sure it that is the right term -- talking about the little pertrusion on either end that you can grind away to acheive identical weights) on several different types of rods, but never on ones created for the VQ35.
PS- when is your website going up? I've been curious about your prices since you first let us know you would be building.
PS- when is your website going up? I've been curious about your prices since you first let us know you would be building.
the site will be up very soon, getting close to having it done, just been very busy. If you'd like a quote, send me a pm, as we will not have many prices on the site anyways
ya typically a belt type sander is used to remove small amounts of material on the very top or very bottom of the rod to balance it. then a die grinder is used to remove small amounts of material from the pistons to match those. typically on the underneath of the piston head.
Thread Starter
Sponsor
builtZmotors
builtZmotors
iTrader: (21)
Joined: Jul 2004
Posts: 2,780
Likes: 0
From: Albuquerque, NM
Originally Posted by overZealous1
ya typically a belt type sander is used to remove small amounts of material on the very top or very bottom of the rod to balance it. then a die grinder is used to remove small amounts of material from the pistons to match those. typically on the underneath of the piston head.
Thread
Thread Starter
Forum
Replies
Last Post
Colombo
Forced Induction
35
Nov 9, 2020 10:27 AM
