Machine shop

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Machine shop

Post  tconnection on February 23rd 2012, 11:54 pm

What all does a machine shop need to totally race prep a block other than one piston and head studs?
Thanks

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Re: Machine shop

Post  466cj on February 24th 2012, 12:13 am

Need all the pistons. Need to know what rings you plan to use. Need to know what height to deck the block to. Steve

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Re: Machine shop

Post  Wheelie58 on February 24th 2012, 9:47 am

Plus...
If you want to make sure your main bearing clearances are correct...the first time.... supply your crank and bearings. If the main bores are on the tight side of the tolerance, they may need line honed. It is much better to figure that out prior to assembly time.
Another thought...if it will have an aftermarket stroker assembly, you should validate rod to block clearance.
It is also a great time to check lifter bore clearance, and If the shop will install your cam bearings, they should ask for the cam that will be used.
Just a couple more thoughts.....
Keith
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Re: Machine shop

Post  rmcomprandy on February 24th 2012, 11:59 am

tconnection wrote:What all does a machine shop need to totally race prep a block other than one piston and head studs?
Thanks

Enough money to pay for all the hours spent.

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Re: Machine shop

Post  D. Sea on February 24th 2012, 12:16 pm

rmcomprandy wrote:
tconnection wrote:What all does a machine shop need to totally race prep a block other than one piston and head studs?
Thanks

Enough money to pay for all the hours spent.

^^^ What a Face
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Re: Machine shop

Post  rmcomprandy on February 24th 2012, 1:59 pm

D. Sea wrote:
rmcomprandy wrote:
tconnection wrote:What all does a machine shop need to totally race prep a block other than one piston and head studs?
Thanks

Enough money to pay for all the hours spent.

^^^ What a Face

I can't tell you the amount of people who come in here wanting the short block "set-up" for them to assemble and will pay for the machining but, will expect you to spend the hours to do all the fitment work for $150.00 or even less. Rolling Eyes

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Re: Machine shop

Post  D. Sea on February 24th 2012, 4:16 pm

I hear ya' Randy. Some people want stuff for "Free"

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Re: Machine shop

Post  tconnection on February 24th 2012, 11:04 pm

I for sure dont want it done for da low nor for free,. I rather pay the cost for good work. I took it to the machine shop today for a total race prep. Its a new a460 block. He only asked for one piston head studs, rings and support rails for file fitting and is gonna install coated dura bond cam bearing for like 700 bucks. Jus didnt know wat all was needed lastnite.
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Re: Machine shop

Post  tconnection on February 26th 2012, 1:15 am

I was told the block will get bored and honed with torque plates, align hone the mains, decked and coated cam bearings. Why would all 8 pistons be needed?
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Re: Machine shop

Post  466cj on February 26th 2012, 3:45 am

If they are all exactly the same only need one. Some will marry each to a cylinder if there is a small variation, some just like to check them to be sure none are off so are not get blaimed when the engine has the wrong running clearance on some cylinders because of something not right with the piston.

Steve

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Re: Machine shop

Post  tconnection on February 26th 2012, 12:11 pm

What about the piston to wall clearance? Diamond 4.530 piston, would a good shop know what clearance this piston needs? What the best deck height? Domed a460.
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Re: Machine shop

Post  rmcomprandy on February 26th 2012, 1:53 pm

466cj wrote:If they are all exactly the same only need one. Some will marry each to a cylinder if there is a small variation, some just like to check them to be sure none are off so are not get blaimed when the engine has the wrong running clearance on some cylinders because of something not right with the piston.

Steve

Just a simple question ... how would you hand fit the rings without having the entire set ...?

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Re: Machine shop

Post  466cj on February 26th 2012, 4:14 pm

rmcomprandy wrote:
466cj wrote:If they are all exactly the same only need one. Some will marry each to a cylinder if there is a small variation, some just like to check them to be sure none are off so are not get blaimed when the engine has the wrong running clearance on some cylinders because of something not right with the piston.

Steve

Just a simple question ... how would you hand fit the rings without having the entire set ...?

Randy my reply was to the question of why would they need all 8 pistons. As for rings based on the Op's question shop is only prepping the block so will be up to who ever puts this thing together to check everything is right and to clearance the rings, etc...

Personally IMO he'd be better off to have the shop do the short block! Everyone wants to put it together, but most don't have the measurement equipment and knowledge to do it right. When I used to work at a machine shop we would ask for everything and check the bearing clearances to the crank and cam, fit the rings, do all the measurement and prep to make sure everything was right, then hand it all back to the customer so they could have the thrill of assembly. Really be easier if they just let us do it! Of course some customers do let you assemble it...

Steve

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