head bolts for 400bhp+ cosworth engine??
#1
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head bolts for 400bhp+ cosworth engine??
i need some advise on what head bolts are ideal for a 205 block cosworth engine running over 400bhp other then taking the risk of getting it long studded?
cheers nick
cheers nick
#9
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ok cheers for the advice everyone looks like ill be going for standard head bolts, just out of curiosity has anyone ever managed to long stud a 205 block? ive heard alot about it being hit and miss previously?
#11
Regular Contributor
There have been some YBL-blocks (205) where you can use long bolts.
we are referring to the std 205 blokcs fitted to the production sierra 3 door and sapphire cosworth
there is insufficient waste casting in the base of the block to do this successfully
we are referring to the std 205 blokcs fitted to the production sierra 3 door and sapphire cosworth
there is insufficient waste casting in the base of the block to do this successfully
Last edited by Turbosystems; 31-05-2012 at 11:32 AM.
#15
#17
Regular Contributor
i have arp and 205 now for 10000 miles no problem i think good ideal for 400 hp as a limit ..for above even 20 hp you need long studs ..i never seen 205 block with long studs ...that it will be very good because i have 2 blocks and no 200
#19
Regular Contributor
#20
*** Sierra RS Custard ***
iTrader: (3)
Ive used ARP's on YB engines without a problem, its a fastener that very commonly gets used on other engines (Vauxhall XE in both N/A and turbo form for one) without any drama so its weird the way that people seem to consider them a problem on the YB.
Not sure if Tony's comment was meant as a joke or not, but they do stretch when torqued up, they just dont get taken past their point of elasticity so they shrink back down again when untorqued. They provide a good and lasting clamping pressure to the head for umpteen years of use in fact.
Given that the standard ones (if you buy a quality brand like Tony suggests) are well upto the job though, you may as well just go for those.
Not sure if Tony's comment was meant as a joke or not, but they do stretch when torqued up, they just dont get taken past their point of elasticity so they shrink back down again when untorqued. They provide a good and lasting clamping pressure to the head for umpteen years of use in fact.
Given that the standard ones (if you buy a quality brand like Tony suggests) are well upto the job though, you may as well just go for those.
#22
Regular Contributor
Ive used ARP's on YB engines without a problem, its a fastener that very commonly gets used on other engines (Vauxhall XE in both N/A and turbo form for one) without any drama so its weird the way that people seem to consider them a problem on the YB.
Not sure if Tony's comment was meant as a joke or not, but they do stretch when torqued up, they just dont get taken past their point of elasticity so they shrink back down again when untorqued. They provide a good and lasting clamping pressure to the head for umpteen years of use in fact.
Given that the standard ones (if you buy a quality brand like Tony suggests) are well upto the job though, you may as well just go for those.
Not sure if Tony's comment was meant as a joke or not, but they do stretch when torqued up, they just dont get taken past their point of elasticity so they shrink back down again when untorqued. They provide a good and lasting clamping pressure to the head for umpteen years of use in fact.
Given that the standard ones (if you buy a quality brand like Tony suggests) are well upto the job though, you may as well just go for those.
#24
*** Sierra RS Custard ***
iTrader: (3)
Ive been using ARP stud and nuts in various engines, (for rod bolts too not just head ones) for 20 years and never had that problem, I would suspect an installation problem TBH
#26
*** Sierra RS Custard ***
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Sounds like you are making a fuss over nothing TBH mate in that case.
#27
Super Moderator
iTrader: (5)
I wasn't joking chip
ARP stud and nuts are not suitable for a yb
options are std k1000 , victor reinz or genuine long studs done by the pros
none of the top yb builders use them or recommend arp head studs in fact we all just laugh every time we see an engine with them in
ARP stud and nuts are not suitable for a yb
options are std k1000 , victor reinz or genuine long studs done by the pros
none of the top yb builders use them or recommend arp head studs in fact we all just laugh every time we see an engine with them in
#29
*** Sierra RS Custard ***
iTrader: (3)
I wasn't joking chip
ARP stud and nuts are not suitable for a yb
options are std k1000 , victor reinz or genuine long studs done by the pros
none of the top yb builders use them or recommend arp head studs in fact we all just laugh every time we see an engine with them in
ARP stud and nuts are not suitable for a yb
options are std k1000 , victor reinz or genuine long studs done by the pros
none of the top yb builders use them or recommend arp head studs in fact we all just laugh every time we see an engine with them in
Have you any idea what about the YB causes the problems you are talking about? As like I mentioned they've been fine in engines I have built using them, in fact I have even re-used them and still not had an issue.
#30
Super Moderator
iTrader: (5)
Yeah ive noticed that plenty of YB engine builders dont like them, just strange that the YB specifically has an issue when so many other iron block and ally head engines dont.
Have you any idea what about the YB causes the problems you are talking about? As like I mentioned they've been fine in engines I have built using them, in fact I have even re-used them and still not had an issue.
Have you any idea what about the YB causes the problems you are talking about? As like I mentioned they've been fine in engines I have built using them, in fact I have even re-used them and still not had an issue.
surely the fact that the top yb builders don't use them says it all
only people like yourself seem to think they are ok based on very little experience
the stretch bolt was a revolutionary design for alloy heads
studs were used in prehistoric times like the moris minor era
why people get so excited that they are throwing away a cosworth designed part specifically designed for the yb and replacing it with a morris minor head stud is beyond me
I'll start your debate and leave your brain to start up in analytical mode
The cosworth yb head has a thermal expansion rate of 17 thou form 20C to 90C
#32
*** Sierra RS Custard ***
iTrader: (3)
stop using them chip ffs
surely the fact that the top yb builders don't use them says it all
only people like yourself seem to think they are ok based on very little experience
the stretch bolt was a revolutionary design for alloy heads
studs were used in prehistoric times like the moris minor era
why people get so excited that they are throwing away a cosworth designed part specifically designed for the yb and replacing it with a morris minor head stud is beyond me
I'll start your debate and leave your brain to start up in analytical mode
The cosworth yb head has a thermal expansion rate of 17 thou form 20C to 90C
surely the fact that the top yb builders don't use them says it all
only people like yourself seem to think they are ok based on very little experience
the stretch bolt was a revolutionary design for alloy heads
studs were used in prehistoric times like the moris minor era
why people get so excited that they are throwing away a cosworth designed part specifically designed for the yb and replacing it with a morris minor head stud is beyond me
I'll start your debate and leave your brain to start up in analytical mode
The cosworth yb head has a thermal expansion rate of 17 thou form 20C to 90C
What sort of failures have you actually seen though, is it just the issues with the block cracking or have you found that the studs get taken past their point of elasticity and hence stretch and dont recover like you have hinted in this thread?
I dont really see how that would happen with less than half a mm of expansion on a stud of 150mm or so, they can withstand that sort of expansion without going past their elastic limit after all, and once again, other iron block and alloy head engines work well on them.
Dont think im implying you are incorrect, I dont think that at all mate, in fact Im sure you know exactly what you are doing with the YB engine.
Im just interested in the details of the issues you've seen and why they have happened, as its counter intuitive to me that an 8740 steel alloy head stud could be forced to stretch for example when the thing doing so is an ally head, Ive seen the opposite happen in fact, ie the head being crushed.
#33
Live long and prosper!!
iTrader: (1)
This is what happens with arp studs in a coosie 205 block.....Treads fully clean tapped and blown out fiited as per arp's instructions too same as this block was still on its std bore only took head off due to shitty cometic gasket firing rings being too thick and allowing water and oil mix on rest of gasket.....
Last edited by costina; 21-11-2012 at 09:07 PM.
#39
Live long and prosper!!
iTrader: (1)
I wasn't joking chip
ARP stud and nuts are not suitable for a yb
options are std k1000 , victor reinz or genuine long studs done by the pros
none of the top yb builders use them or recommend arp head studs in fact we all just laugh every time we see an engine with them in
ARP stud and nuts are not suitable for a yb
options are std k1000 , victor reinz or genuine long studs done by the pros
none of the top yb builders use them or recommend arp head studs in fact we all just laugh every time we see an engine with them in
Take This advice guys you may be lucky atm i was'nt and so many others too.
200 blocks can and will suffer too.
#40
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You say it's fine but most of the time you don't notice until the head is removed and then there is a good chance there's a crack between the bolt holes to a water way mate. If that comes apart again and it's not cracked I would put standard bolts in tbh and if you can find someone that can do it in situ get the head and block doweled