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Old 12-27-2008, 08:19 AM
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Tool to torque middle intake bolts?

When tightening the inner intake studs on my SBC intake, I find it's impossible to use a torque wrench due to the angled nature of the bolt holes leading the tool to want to intersect the carb boss. As a result, the only way I can tighten these is to use a hex bit in combination with a ratchet wrench, which has no way of measuring torque.

What do you guys use?

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Old 12-27-2008, 08:30 AM
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Ayuh,...

The same wrench as yourself,+ My Calibrated Elbow......
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Old 12-27-2008, 08:35 AM
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Quote:
Originally Posted by bondo
Ayuh,...

The same wrench as yourself,+ My Calibrated Elbow......
lol, yea, that's how I'm doing it. Not exactly accurate though! Also, because the hex bit needs only a 10mm (12mm at the most, can't recall off-hand) ratchet wrench to turn it, I've already managed to render one wrench useless as those tiny little ratchet wrenches were not designed to withstand much more than 'hand-tight' torque.

There must be a 'special tool' for the job that permits accurate torque measurement of these inner bolts?
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Old 12-27-2008, 08:42 AM
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Boxed end wrench and a "medium grunt" works for me.
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Old 12-27-2008, 10:04 AM
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I never have torqued, or even tried to torque the center bolts, just a box end and a little muscle.

Vince
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Old 12-27-2008, 10:05 AM
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I've spent so long at this that I can usually get within 5-10 lb-ft by elbow feel. I suggest you try several fasteners on something else, then use the torque wrench to test your guesses. When you have a feel for the proper torque, then you can just use a combination wrench and estimate.

Proper torque prevents the fastener from backing out and stretches it to the point of its max strength. In the case of an intake bolt, its main purpose is to seal the intake. There is no torsional or longitundinal stress placed on those bolts during engine operation. Since the intake will seal over a wide range of torque values, its not as critical as main and rod bearings, or flywheel bolts.
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Old 12-27-2008, 10:17 AM
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Thanks for the info guys... I guess my existing method is what most other folks also use, so I feel more confident doing it that way now, without feeling 'sloppy'.

Cheers,
Ian.
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Old 12-27-2008, 10:24 AM
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If you really want to be as close as possible with the tools you have there is something called the flat method.

Loosen all of the bolts then run then all down hand tight. Mark one corner of the bolt and place a corresponding line in the intake with a marker. Torque all of the bolts you can reach with the torque wrench then observe how far the bolts have rotated then turn the bolts you can't reach an equal amount. You can do this in steps just like you would if you could get a torque wrench on all of them.

There is one other method but it may prove controversial so I won't bring it up in this thread.
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Old 12-27-2008, 10:45 AM
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I have never torqued a intake on a SBC.And never had any problem's with one yet..
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Old 12-27-2008, 11:37 AM
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Quote:
were not designed to withstand much more than 'hand-tight' torque.
Ayuh,...

Hand Tight is All you need....

5/16" bolts only require about 25ft.lbs. torque...

3/8" bolts only require about 35ft.lbs. torque....

just How Tight have you been Trying to get them,..??
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Old 12-27-2008, 01:04 PM
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Quote:
Originally Posted by bondo
Ayuh,...

Hand Tight is All you need....

5/16" bolts only require about 25ft.lbs. torque...

3/8" bolts only require about 35ft.lbs. torque....

just How Tight have you been Trying to get them,..??
30 ft-lbs... you must have very strong hands if you can tighten a bolt to that torque by hand. Bear in mind, being a small 10-12mm wrench, the wrench is only about 4"-5" long.
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Old 12-27-2008, 03:03 PM
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Quote:
Originally Posted by Blazin72
If you really want to be as close as possible with the tools you have there is something called the flat method.

Loosen all of the bolts then run then all down hand tight. Mark one corner of the bolt and place a corresponding line in the intake with a marker. Torque all of the bolts you can reach with the torque wrench then observe how far the bolts have rotated then turn the bolts you can't reach an equal amount. You can do this in steps just like you would if you could get a torque wrench on all of them.

There is one other method but it may prove controversial so I won't bring it up in this thread.
This makes more sense to me than any method I have used or heard used. Like most others, I have always used the "armstrong" method and never have had a problem. After you have been twistin' wrenches for 40-50 years like most of us, you just get a feel for it and know when to stop. But this method outlined by Blazin72 is brilliant.

V8hed, the wrench may only be 4-5 inches long, but there's nothing to prevent you sliding a 2-ft pipe onto it and doin' it the easy way.
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Old 12-27-2008, 03:16 PM
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to be real accurate

you could weld an old socket to the end of a box wrench ...torque the other bolts with a regular socket. then check it with your tool ...read the adaptor number and torque the center ones to that number. I think an airplane mechanic had a tool like that in his tool box..
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Old 12-27-2008, 03:20 PM
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I've also just used a box end and "guessed"- one thing to note is that with a 6" long wrench you only need a 60 pound force acting perendicular to it, while it may sound like a lot its actaully easier to hit than you might imagine. Of course I'm just a young kid who spends alot of time in the gym, but even my pop with all of his arthritis can hit it pretty easily.

Its roughly the same force used to torque mains (of course that depends on the length of your torque wrench).
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Old 12-27-2008, 05:02 PM
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yes there is a method that works well
use a crows foot and this calculator
http://www.norbar.com/Calculators/To...0/Default.aspx
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