Block Correction Machining - Belt Surfaced Block - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 07-06-2012, 12:18 AM   #1
Senior Member
Thread Starter
iTrader: (1)
 
BogusSVO's Avatar
 
Join Date: Mar 2012
Location: Pensacola Fla.
Posts: 590
Total Cats: 191
Default Block Correction Machining - Belt Surfaced Block

Block Correction Machining


This block was machined at another shop, then ended up at my shop.



To start with the block gasket surface was belt surfaced.
I have heard of this being done, but this was the first time I have seen it in person.


A longer view


The hone job was sub par also. But I did not get a pic of that.

When setting the block up to be milled, I did the “quick set up”
This method indexes the gasket surface to the oil pain rails, and not the main journals.

The oil pan rails had some light surface rust on them



I long boarded the oil pain rails, to make sure they were clean and no burs that would hinder the accuracy of the set up.



After they were cleaned.


I do not much care for this set up, for the simple reason that most block oil rails have a wide range in tolerance.



Some shops will set up like this and then use shims to level the block deck.

I found .002 tilt from front to back on this set up. That dose not seem too bad.


But Blocks are NOT machined to the oil pan rails, they are machined indexed to the main journals.

So I took this set up down and set up to deck the block to the mains.

This is the bar the main journals of the block will rest on.


I checked the bar and it had less than .0005 from end to end distortion.

Setting the block on the bar

Notice the hold down on the left side.


Now that the block is set up on the mains, checking the tilt showed .0045
This lets me know the oil pain rails are .002 off from the main journals.


Now to mill the block, I will start with a .0005 “getting to know you pass”


Now that I am sure of the set up, I cut another .002


The block still has a low corner.


After another .002 pass for a total of .0045 removed, I was left with this.


I made a final pass of .001 for a total mill of .0055 removed.


Now that the block was milled, it removed some of the top champher from the cylinder bore, this aids in the installation of the piston and rings into the block.

The “hi-tech” tool used to champher the block.


The cylinder on the left has had the champher cut, the right has not been.


The crosshatch I honed in the block.


After the block has been washed to remove metal flake and grit from machining.
This block still will need a final wash before assembly.
Attached Thumbnails
Block Correction Machining - Belt Surfaced Block-img_0963.jpg   Block Correction Machining - Belt Surfaced Block-img_0949.jpg   Block Correction Machining - Belt Surfaced Block-img_0948.jpg   Block Correction Machining - Belt Surfaced Block-img_0940.jpg   Block Correction Machining - Belt Surfaced Block-img_0942.jpg  

Block Correction Machining - Belt Surfaced Block-img_0943.jpg   Block Correction Machining - Belt Surfaced Block-img_0957.jpg   Block Correction Machining - Belt Surfaced Block-img_0955.jpg   Block Correction Machining - Belt Surfaced Block-img_0961.jpg   Block Correction Machining - Belt Surfaced Block-img_0971.jpg  

Block Correction Machining - Belt Surfaced Block-img_0972.jpg   Block Correction Machining - Belt Surfaced Block-img_0974.jpg   Block Correction Machining - Belt Surfaced Block-img_0975.jpg   Block Correction Machining - Belt Surfaced Block-img_0976.jpg   Block Correction Machining - Belt Surfaced Block-img_0978.jpg  

Block Correction Machining - Belt Surfaced Block-img_0982.jpg   Block Correction Machining - Belt Surfaced Block-img_0983.jpg   Block Correction Machining - Belt Surfaced Block-img_0988.jpg   Block Correction Machining - Belt Surfaced Block-img_0985.jpg  
BogusSVO is offline   Reply With Quote
Old 07-06-2012, 10:08 AM   #2
Hear me Meow
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default

Very nice. I think the pictures in this one are great.
skidude is offline   Reply With Quote
Old 07-06-2012, 11:12 AM   #3
Elite Member
iTrader: (46)
 
Stein's Avatar
 
Join Date: Dec 2007
Location: Nebraska
Posts: 4,812
Total Cats: 138
Default

Nice pics and writeup. Is it safe to say that belt surfaced isn't tied to any surface, just flattening to whatever deck surface there was to start with? They don't tie to the journals at all do they?
Stein is offline   Reply With Quote
Old 07-06-2012, 12:11 PM   #4
Senior Member
Thread Starter
iTrader: (1)
 
BogusSVO's Avatar
 
Join Date: Mar 2012
Location: Pensacola Fla.
Posts: 590
Total Cats: 191
Default

Stein.... you know the little belt sander you have in your shop? Make it huge.. grab the part to be surfaced, hold it as steady as you can and step on the pedle.

Hold on like a man.

You now have been trained on a belt surfacer...

Block Correction Machining - Belt Surfaced Block-photo0091.jpg
BogusSVO is offline   Reply With Quote
Old 07-06-2012, 12:22 PM   #5
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Thanks for the thread. I always enjoy your writeups and pics.
Ben is offline   Reply With Quote
Old 07-06-2012, 01:46 PM   #6
Senior Member
iTrader: (10)
 
Join Date: Aug 2007
Location: Fredericton, NB
Posts: 1,187
Total Cats: 4
Default

Got a new camera???

Great writeup and pics!
Preluding is offline   Reply With Quote
Old 07-08-2012, 03:16 PM   #7
Senior Member
iTrader: (4)
 
mr_hyde's Avatar
 
Join Date: Jul 2009
Location: Seattle
Posts: 799
Total Cats: 25
Default

I'm sure at least a few of your 100+ props have come from me, but here's another. Mods should make a set of stickies out of your machine shop and build threads. Thank you for your contributions!
mr_hyde is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 58 Yesterday 10:04 PM
Another Cast Manifold Corky Bell Prefabbed Turbo Kits 18 11-22-2016 10:01 PM
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
NA Seat Sliders and Seat Belt Receivers skipstr Miata parts for sale/trade 2 09-28-2015 11:53 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:33 AM.