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Club President
I supported Toymods
Location:
Sydney
Registered:
May 2002
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HEAD STUDS vs. HEAD BOLTS
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Sun, 11 July 2004 08:36
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This is straight from the ARP website.  I just thought some of you may be interested in why they were a good idea.
HEAD STUDS vs. BOLTS... A TECHNICAL DISCUSSION
ARP's factory Tech Representatives are often asked which is better, cylinder head studs or bolts. The answer, invariably, depends on the installation. On many street-driven vehicles, where master cylinders and other items protrude into the engine compartment, its probably necessary to use head bolts so that the cylinder heads can be removed with the engine in the car.
For most applications, however, studs are recommended. And for good reason. Using studs will make it much easier to assemble an engine (especially a racing powerplant which must be serviced frequently and quickly!) with the cylinder head and gasket assured of proper alignment.
Studs also provide more accurate and consistent torque loading. Heres why. When you use bolts to secure the head, the fastener is actually being twisted while its being torqued to the proper reading. Accordingly, the bolt is reacting to two different forces simultaneously. A stud should be installed in a relaxed mode never crank it in tightly using a jammed nut.
If everything is right, the stud should be installed finger tight. Then, when applying torque to the nut, the stud will stretch only on the vertical axis. Remember, an undercut shorter stud will have a rate similar to a longer, standard shank stud. This provides a more even clamping force on the head. Because the head gasket will compress upon initial torquing, make sure studs and bolts are re-torqued after the engine has been run.
[Updated on: Sun, 11 July 2004 08:40]
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| | Subject | Poster | Date |
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HEAD STUDS vs. HEAD BOLTS
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thetoyman75 | Sun, 11 July 2004 08:36 |
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Re: HEAD STUDS vs. HEAD BOLTS
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fade-e | Sun, 11 July 2004 08:50 |
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Re: HEAD STUDS vs. HEAD BOLTS
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earlyrolla | Sun, 11 July 2004 09:33 |
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Re: HEAD STUDS vs. HEAD BOLTS
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kingmick | Sun, 11 July 2004 09:52 |
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Re: HEAD STUDS vs. HEAD BOLTS
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fade-e | Sun, 11 July 2004 10:31 |
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Re: HEAD STUDS vs. HEAD BOLTS
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THE WITZL | Sun, 11 July 2004 10:46 |
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Re: HEAD STUDS vs. HEAD BOLTS
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ed_ma61 | Sun, 11 July 2004 11:24 |
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Re: HEAD STUDS vs. HEAD BOLTS
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allencr | Sun, 11 July 2004 13:06 |
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Re: HEAD STUDS vs. HEAD BOLTS
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ed_ma61 | Sun, 11 July 2004 13:11 |
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Re: HEAD STUDS vs. HEAD BOLTS
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toynado | Sun, 11 July 2004 17:12 |
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Re: HEAD STUDS vs. HEAD BOLTS
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ed_ma61 | Sun, 11 July 2004 17:25 |
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Re: HEAD STUDS vs. HEAD BOLTS
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Mr DOHC | Mon, 12 July 2004 09:19 |
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Re: HEAD STUDS vs. HEAD BOLTS
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Super Jamie | Mon, 12 July 2004 10:55 |
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Re: HEAD STUDS vs. HEAD BOLTS
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toynado | Tue, 13 July 2004 01:48 |
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Re: HEAD STUDS vs. HEAD BOLTS
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Super Jamie | Tue, 13 July 2004 01:59 |
