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Old 12-09-2012, 09:30 PM   #1
sburck
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Default Boring a subaru motor with an old school boring bar?

Well I have the feeling that this might be a terrible idea, but as a DIY enthusiast I thought it must be worth asking. Would using an old fashioned boring bar like the van norman 777 shown in the video below to bore out an ej block work, and work well?

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Old 12-11-2012, 09:54 PM   #2
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no ideas on this?
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Old 12-12-2012, 10:50 AM   #3
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It would work but you would need to mount the block on something more rigid than an engine stand. Also you would need to ensure the deck is prefectly flat as well as the bottom of the boring bar to ensure it is perfectly perpendicular to the bore. Modern boring bars will let you level the deck (on the fixture) as the boring bar is perfectly perpendicular to the fixture.
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Old 12-12-2012, 06:43 PM   #4
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Would you need a torque plate?
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Old 12-12-2012, 06:59 PM   #5
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Quote:
Originally Posted by sburck View Post
Would you need a torque plate?
Nevermind.

Last edited by djdalaney; 12-13-2012 at 05:07 PM.
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Old 12-12-2012, 07:08 PM   #6
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Stock head bolts or ARP?
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Old 12-12-2012, 07:26 PM   #7
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Originally Posted by djdalaney View Post
The head bolts aren't directly next to the cylinders, so torquing them down shouldn't cause any cylinder distortion. You shouldn't need a torque plate in this application.
What?
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Old 12-12-2012, 08:18 PM   #8
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^ya I dont get that? Why wouldn't you need a tq plate?
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Old 12-12-2012, 08:45 PM   #9
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You do realize that torque plates are highly recommended with our engines, right? There has been measured and proven cylinder distortion when torquing head bolts/studs down.
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Old 12-12-2012, 11:13 PM   #10
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Quote:
Originally Posted by sburck View Post
Would you need a torque plate?

not when you bore, only when you hone.
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Old 12-12-2012, 11:31 PM   #11
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^^^I guess I should've read into that a little, he may have meant it that way...
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Old 12-13-2012, 03:30 PM   #12
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You do realize that torque plates are highly recommended with our engines, right? There has been measured and proven cylinder distortion when torquing head bolts/studs down.
Torque plates are only necessary if the cylinder distorts when the head is torqued down. The head bolts on the EJ engines are out at the edges of the block, so how does that cause cylinder distortion? I'm not familiar with EJ blocks, just general machining. I'm not saying you're wrong, I just don't see how torquing heads down is going to distort the cylinder that isn't directly connected to the head bolt holes due to the open deck design. Do you have any links to info on this?

See below.

Last edited by djdalaney; 12-13-2012 at 05:07 PM.
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Old 12-13-2012, 03:53 PM   #13
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http://forums.nasioc.com/forums/show....php?t=1213861

This is just one that's in the "Links to great threads" sticky up top.
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Old 12-13-2012, 04:29 PM   #14
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In addition to the link posted, years of trial and error from Subaru engine builders, and torque plate use as a common practices in any QUALITY machine shop...ARP also recommends their use. According to their testing heat bolts/studs distort the cylinder in a localized manner in the area of the bolt/stud.
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Old 12-13-2012, 04:31 PM   #15
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In addition to the link posted, years of trial and error from Subaru engine builders, and torque plate use as a common practices in any QUALITY machine shop...ARP also recommends their use. According to their testing heat bolts/studs distort the cylinder in a localized manner in the area of the bolt/stud.
That's what I'm saying. There are plenty of applications where a torque plate is completely unnecessary. Apparently the EJ is not one of those though. Actually, my engine rebuilding/machining teacher basically said, if they make a torque plate for a specific engine, it is probably needed.

Thanks for the link drew.
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Old 12-13-2012, 04:32 PM   #16
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Search my SN for threads started. I did a whole test on TQ plates.
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Old 12-13-2012, 04:34 PM   #17
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^^^Yours was the one I really wanted to link him to. I just found that one faster.
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Old 12-13-2012, 04:56 PM   #18
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Search my SN for threads started. I did a whole test on TQ plates.
Wow, that does distort pretty badly. Thanks for that. All of your threads seem like really good info. Although, you still don't need a torque plate for boring, as the honing will be done after boring.
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