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Antique Gas Engine Discussion

Why Studs Instead Of Bolts ??


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  #1  
Old 02-08-2005, 08:53 PM
Smoke Smoke is offline
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Default Why Studs Instead Of Bolts ??

Doing a little research here for a project I am working on. Can any of you tell me why the old engine companys used studs and nuts to hold the heads on engines instead of just using bolts. The blocks were tapped to use the studs so why not just screw in a bolt. Is there a special reason for it. Thanks
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Old 02-08-2005, 09:10 PM
Ed Malcom Ed Malcom is offline
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Default Re: Why Studs Instead Of Bolts ??

I dont really know but most full blown racing engines today go that route.
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Old 02-08-2005, 09:12 PM
Kevin O. Pulver Kevin O. Pulver is offline
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Default Re: Why Studs Instead Of Bolts ??

I don't know exactly either. I know the old flathead V8 Fords had head studs too, and they can be a real bear to get the head off. Usually the studs gotta come out first. I think they were fine thread on top and coarse in the block.
My best guess is using studs helped support and locate things rather than having to hold a gasket, heavy head, and bolt all at once and try to line it all up.
I know that leads to other questions and objections, but it's the best I can do. Kevin
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Old 02-08-2005, 09:19 PM
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Keith Smigle Keith Smigle is offline
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Default Re: Why Studs Instead Of Bolts ??

Using studs make it much easier to assemble an engine. Try holding any where from a 5 to 50 pound cylinder head up to an engine, and maintain alignment of the head gasket, while you screw in the first head "bolt".
Especially in a factory of mass production, slipping a head gasket and then the head on "studs" is much easier and less aggravating. As far as top fuel racers are concerned it all has to do with the dynamics of stresses on the threads around the stud or bolt in the block, twisting torque of a bolt VS clamping of a nut on a stud and much more than engine builders of 100 years ago really cared about.
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Old 02-08-2005, 10:25 PM
Gasengin Gasengin is offline
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Default Re: Why Studs Instead Of Bolts ??

When treads get stripped from repeated assembly and disassembly, the stud can easily be replaced and it will be as good as new.
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Old 02-08-2005, 11:25 PM
RHudson RHudson is offline
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Default Re: Why Studs Instead Of Bolts ??

right o, with bolts, you are wearing out the threads in the block, with studs you are wearing out the threads on the stud, which can be replaced.
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Old 02-09-2005, 10:53 AM
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Mark Thompson Mark Thompson is offline
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Default Re: Why Studs Instead Of Bolts ??

I am guessing that it was mostly economics.

Many years ago, it would be cheaper/easier to make a stud and nut then machine a long bolt.

Most bolts were machined starting with the size of the wrench flats then turned downed to the actual bolt size then treaded. Today, the heads are formed by being upset.

I also agree that studs allow for easier assembly and maybe even the radial stress factor.

Take care

-Mark Thompson
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Old 02-09-2005, 02:49 PM
Smoke Smoke is offline
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Default Re: Why Studs Instead Of Bolts ??

Thanks for the replies folks. I am building a compressor pump/engine conversion. I am machining a complete head and wasn't sure if I wanted to use bolts or studs. I think I will make studs. Thanks
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Old 02-09-2005, 09:02 PM
Al Wait Al Wait is offline
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Default Re: Why Studs Instead Of Bolts ??

A bolt may bottom in its hole, and therefore not keep the head tight. Al Wait
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Old 02-09-2005, 09:34 PM
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Frank K Jr. Frank K Jr. is offline
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Default Re: Why Studs Instead Of Bolts ??

The stud and nut setup is stronger than a bolt. Notice the old steam engines has stud/nut setups to hold everything in place. Take notice to the thickness of a bolt head compared to the thickness of a nut. With the proper amount of thread above the nut, it would have to strip a lot of threads before the assembly would have fallen apart. This would have given a responsible crewman enough time to make repairs before major damage occured. A few years back I had a v8 block bored and honed. The shop asked if I was going to use bolts or studs for the cyl head. They told me it made a difference in the deflection of the block at the head bolts.

Hope this helps,
Frank
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Old 02-10-2005, 10:55 PM
David L. Showerman David L. Showerman is offline
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Default Re: Why Studs Instead Of Bolts ??

With the use of studs, It is easier to have a "full compliment" of thread in the block before adding the stress of tightning the fastner. In other words, It is better to have about 2 - 1/2 times the diameter of the bolt/stud in place before adding stress. Just my 2 cents worth. Dave in Holt.
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