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Bob Weights for 2.8 V6 Ford Engine
- Thread starter DanR
- Start date
kmathis
Donation Time
Hi, Dan:
Are you talking about balancing the rotating assembly on you 2.8? If it is; that is a process, that the machine shop does, by weighing all of the rotating components, and adding weight or removing weight to make them all weigh the same; then they balance the crank, flywheel, and crank pulley.
Are you talking about balancing the rotating assembly on you 2.8? If it is; that is a process, that the machine shop does, by weighing all of the rotating components, and adding weight or removing weight to make them all weigh the same; then they balance the crank, flywheel, and crank pulley.
DanR
Diamond Level Sponsor
Kelly, That is what I am asking about!
My Machine Shop does alot of racing engines and other types of stuff But has not balanced a 2.8 V6 in more than twenty years.
That is why I'm looking around trying to locate them.
Yes, I want the complete Engine Assembly balanced. They need the "Bob Weights to continue with the process.
Any help in this matter is appreciated.
My Machine Shop does alot of racing engines and other types of stuff But has not balanced a 2.8 V6 in more than twenty years.
That is why I'm looking around trying to locate them.
Yes, I want the complete Engine Assembly balanced. They need the "Bob Weights to continue with the process.
Any help in this matter is appreciated.
kmathis
Donation Time
Maybe, someone else can chime in on this one, my engine was balanced; they drilled a hole or two on the counterweights of the crankshaft, to remove weight, drilled another hole and filled it with a heavier metal and welded that in to add weight, and did the same on the rest of the rotating assembly till it was balanced. I have never heard of a particular component to add or remove weight. Which doesn't mean it doesn't exist, but my engine shop didn't ask for anything extra. I must say, though, that the old man that did my engine, is an old school race engine builder for about 45 years, and relies on very tried and true methods that he has been practicing for a long time, so these "bob weights" could be something that is for later engines...maybe?
Also, the amount of weight that usually needs to be added or removed, is very slight.
Which doesn't mean it doesn't exist, but my engine shop didn't ask for anything extra. I must say, though, that the old man that did my engine, is an old school race engine builder for about 45 years, and relies on very tried and true methods that he has been practicing for a long time, so these "bob weights" could be something that is for later engines...maybe?Also, the amount of weight that usually needs to be added or removed, is very slight.
Mike Armstrong
Bronze Level Sponsor
Never heard of the term before myself but a quick Google search brung up some interesting info.
http://www.carcraft.com/howto/ccrp_0803_engine_balancing/viewall.html
http://www.hinesindustries.com/documents/reciprocalmass.pdf
http://www.carcraft.com/howto/ccrp_0803_engine_balancing/viewall.html
http://www.hinesindustries.com/documents/reciprocalmass.pdf
So Dan, when they ask for the Bob Weights are they simply asking for the numbers - in other words, what are the "bob weight" values for your crank?
Or are they yanking your chain? My brother when he was in the Navy on an airdraft carrier told me it was a common joke to ask a newbie to go to the stockroom and get some "prop wash"
And yeah, this was in the 60s when they still had a few prop planes on carriers
Tom
Or are they yanking your chain? My brother when he was in the Navy on an airdraft carrier told me it was a common joke to ask a newbie to go to the stockroom and get some "prop wash"
And yeah, this was in the 60s when they still had a few prop planes on carriers
Tom
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DanR
Diamond Level Sponsor
No these Guys are for real! They are not yanking my Chain, like go get a left hande monkey wrench
The Bob Weights are "weights" utilized to balance the engine assy.
I'm attempting to "locate" the weights that some Shop has that are not using or may "Loan" to us or even sell if it gets to that.
I can see where my shop will need them for at least three (3) engines for me alone.
Perhaps you guys will ask 'your" shop guys if they are willing to loan out their "bobs" for the Ford 2.8 V6.
Maybe you can scout around and find some machine shop that has them but no longer using for lack of demand (fewer and fewer 2.8 ford engines).
The Bob Weights are "weights" utilized to balance the engine assy.
I'm attempting to "locate" the weights that some Shop has that are not using or may "Loan" to us or even sell if it gets to that.
I can see where my shop will need them for at least three (3) engines for me alone.
Perhaps you guys will ask 'your" shop guys if they are willing to loan out their "bobs" for the Ford 2.8 V6.
Maybe you can scout around and find some machine shop that has them but no longer using for lack of demand (fewer and fewer 2.8 ford engines).
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Typically, bob weights are adjustable. All the pistons and rods are balanced then you take one rod and weigh it, add the weight of one of the pistons and one set of rings with one wrist pin with a set of rod bearings. The totals of all of these are added to the bobweights. After you have the same amount of weight on all the crank journals, you can spin it up to balance the crank.
Jose
Jose
Mike Armstrong
Bronze Level Sponsor
Hi Jose.
So, are 'bob weights' a physical object you can hold in your hand or are they simply a figure on paper of the total weights of different engine parts? I'm thinking the latter.
So, are 'bob weights' a physical object you can hold in your hand or are they simply a figure on paper of the total weights of different engine parts? I'm thinking the latter.
So, the bob weights are used to represent the piston, pin and rod weight during the crank balancing process, is that right? They are not left on the crank.
I know when I had motorcycle stuff done I just gave the whole deal to the machine shop: crank, pistons, pins rods; then let them figure it out. From google it looks like most bob weights are adjustable and not specific to an application so maybe Tom's onto something and they want the value to use (in which case giving them the piston/rod/pin would give them the info). Either that or they don't have the appropriate range of weights for your engine?
I know when I had motorcycle stuff done I just gave the whole deal to the machine shop: crank, pistons, pins rods; then let them figure it out. From google it looks like most bob weights are adjustable and not specific to an application so maybe Tom's onto something and they want the value to use (in which case giving them the piston/rod/pin would give them the info). Either that or they don't have the appropriate range of weights for your engine?
Bob weights are physical objects that bolt to the crank journals, representing the weight of all the parts I mentioned, so the crank will be spinning the exact weight it wil be spinning while in the block.
The 60 degree V6s are a naturally balanced engines, and are pretty smooth stock, but when balanced, they almost become as smooth as an electric motor.
There is only one way to calibrate the bob weights, and that is to have the weight of all the reciprocating parts, then making all the bob weights weigh exactly the same
Jose
The 60 degree V6s are a naturally balanced engines, and are pretty smooth stock, but when balanced, they almost become as smooth as an electric motor.
There is only one way to calibrate the bob weights, and that is to have the weight of all the reciprocating parts, then making all the bob weights weigh exactly the same
Jose
DanR
Diamond Level Sponsor
My Machine Buddy found some thursday in Cali or Wash state not sure where but they wanted $1500 for a set to do the ford 2.8 V6 (and they are reusable). My guys have different kinds hanging on the machine wall for use on the smc and other type engines.
Costly! but required if you want an engine to run smoothly. And that is what I want! Help me locate some, please.
The Shop in Charlotte, NC has closed. I'm still looking for help.
Costly! but required if you want an engine to run smoothly. And that is what I want! Help me locate some, please.
The Shop in Charlotte, NC has closed. I'm still looking for help.
Mike Armstrong
Bronze Level Sponsor
Interesting, thanks.
MikeH
Diamond Level Sponsor
http://www.racerwalsh.zoovy.com/
The have some V6 stuff and may be able to point you in the right direction.
You might also check on the rangerstation site.
MikeH
Diamond Level Sponsor
I found some specs. Scroll down the list to Ford.
http://www.hinesindustries.com/documents/reciprocalmass.pdf
And found V6 bobweights on the same site.
http://www.hinesindustries.com/balancing-equipment/bobweights.shtml
Poke around on the site. Some interesting stuff here.
They do balancing, too.
http://www.hinesindustries.com/services/balancing-service.shtml
And an interesting article on balancing.
http://www.circletrack.com/enginetech/ctrp_0504_engine_balancing_tech_terminology/viewall.html
And you might check these guys. The modded a 2.9 crank for me.
http://www.standardcrankshaft.com/
http://www.hinesindustries.com/documents/reciprocalmass.pdf
And found V6 bobweights on the same site.
http://www.hinesindustries.com/balancing-equipment/bobweights.shtml
Poke around on the site. Some interesting stuff here.
They do balancing, too.
http://www.hinesindustries.com/services/balancing-service.shtml
And an interesting article on balancing.
http://www.circletrack.com/enginetech/ctrp_0504_engine_balancing_tech_terminology/viewall.html
And you might check these guys. The modded a 2.9 crank for me.
http://www.standardcrankshaft.com/
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