Does anyone know of a source for a headbolt conversion that use studs and nuts, rather than stretch bolts? The advantages of studs vs bolts is clearly outlined on ARP's head stud website.
By the way, did MK1s have electric sunroofs? Thanks.
Headbolts
bolts
Never really looked into stretch bolt theory but have only seen and used them on alloy heads.
If you are not worried about using non stretch bolts/studs just measure the std bolts and have a look through some stud catalogues or pop into your local factors.
Cheers
Luke
If you are not worried about using non stretch bolts/studs just measure the std bolts and have a look through some stud catalogues or pop into your local factors.
Cheers
Luke
Please call me Luke 
1989 BX 16valve White 70k almost up to scratch
1989 BX 16valve White 70k almost up to scratch
Re: Headbolts
What would the purpose of that be? I don't see anything to be gained (unless you're thinking of something i'm not).tobytronic wrote:Does anyone know of a source for a headbolt conversion that use studs and nuts, rather than stretch bolts? Thanks.
AFAIK the purpose of stretch bolts is to expand/contract with the alloy without loosening. Using solid studs/nuts (if it were possible) would inhibit the alloy expanding and cause all sorts of unpleasent nastities.
Now listen here you mullet...
-
Anonymous
Re: Headbolts
Head studs are inherently stronger than bolts. I dont think that there would be any of the problems you suggest: Most F1 engines use them. I intend to supercharge my engine and wish to give the head gasket its best possible chance. I realise that there may be problems removing the cylinder head in situ. I have spoken to a couple of engineers, whom have both confifmed their superiority over bolts. Why would a respected firm such as ARP make the for other all alloy engines? Thanksjayw wrote:What would the purpose of that be? I don't see anything to be gained (unless you're thinking of something i'm not).tobytronic wrote:Does anyone know of a source for a headbolt conversion that use studs and nuts, rather than stretch bolts? Thanks.
AFAIK the purpose of stretch bolts is to expand/contract with the alloy without loosening. Using solid studs/nuts (if it were possible) would inhibit the alloy expanding and cause all sorts of unpleasent nastities.
-
Anonymous
The reason behind this is purely from a tightening point of view. Studs are commonly used where a high tightening torque is required in materials such as softer alloys, often copper based alloys or the same could be said for aluminium.
A stud of a given grade of HTS will have the same mechanical properties (namely tensile strength) as a bolt, whether that bolt be hex or cap head - the weakest point of any mechanical fixing is the 'root' of the thread.
When tightening, bolts have a tendancy to 'gaul' when torquing down an item where a highish clamping force is desired, therefore it is preferrential practice to use a stud in a correctly machined hole, this will all but eliminate damage to the alloy type material.
In addition studs are used where an item may be taken apart reasonably regulary, although as we all know 9 times out of 10 the stud will come out as well
.
Apologies for the essay.
Tony
A stud of a given grade of HTS will have the same mechanical properties (namely tensile strength) as a bolt, whether that bolt be hex or cap head - the weakest point of any mechanical fixing is the 'root' of the thread.
When tightening, bolts have a tendancy to 'gaul' when torquing down an item where a highish clamping force is desired, therefore it is preferrential practice to use a stud in a correctly machined hole, this will all but eliminate damage to the alloy type material.
In addition studs are used where an item may be taken apart reasonably regulary, although as we all know 9 times out of 10 the stud will come out as well
.Apologies for the essay.
Tony
