m20 arp studs

[Cabriolet]

i've only found one guy to do that and only make 285whp. thats not much more than a good NA build makes.

http://www.e30tech.com/forum/showthread.php?t=10467

>14psi on stock bolts

[einstein57]

I've never heard of anyone boosting 14+ psi on stock bolts.

[Cabriolet]

Fixed

no, there are many many tests that prove that the metric blues are weaker than the stock BMW ones.

[Exodus_2pt0]

go metric blues ! im going to buy some of those soon , very disappointed when a ARP stud broke off in my block! BIG waste of money , way over priced
called arp about it and they wouldnt send me a new stud to replace the broken one

Umm...

You shouldn't have tried to use the TTY process on them....

[einstein57]

worst advise ever. if you broke an ARP stud you should not be around engines EVER

ARP>metric blue>BMW>VR

Fixed

[Cabriolet]

go metric blues ! im going to buy some of those soon , very disappointed when a ARP stud broke off in my block! BIG waste of money , way over priced
called arp about it and they wouldnt send me a new stud to replace the broken one

worst advise ever. if you broke an ARP stud you should not be around engines EVER

ARP>BMW>metric blue>VR

[4evere30]

go metric blues ! im going to buy some of those soon , very disappointed when a ARP stud broke off in my block! BIG waste of money , way over priced
called arp about it and they wouldnt send me a new stud to replace the broken one

[TS87325IS]

My arp's came today ;-)

[blueapplesoda]

Yeah...stick with Blues. Those studs look promising if they made it in a 12.9 class.. Or just do ARP, those are proven time and time again.

I put metric blues in all my turbo kits as a "at least" precaution, with special install instructions. Just clean the holes really really well. I usually fill it up with some sort of solvent and use a pipe cleaner and aggitate it for about a minute, then use a shop vac attached to a home made gatorade bottle catch can and vacuum lines to suck out all the stuff in the holes before installing. Use good moly type grease/assembly lube.

It's floating around on these forums, but Information, which should always be free.

ARP PNs
M20 HSK part numbers:
14x AM6.770-1B
14x AMN12-1
14x 200-8519

Derek
DedericMS

[JCarp90]

My metric blues will be here tomorrow and my engine will go together this weekend. We shall see...

[RobertK]

oem bolts are comparable and metric blues are quite a few rockwells stronger and still stretch the bolts. So comparing claming force versus tensile strength is pointless. The stud itself will stretch before the nut and spacer give out causing the head to lift and so on and so forth.... reguardless of what the clamp force style is so its a really mute point.
I'm going with ARP studs: http://www.ebay.com/itm/BMW-M20-ARP-...item48416c90e0

You make a very good point and the difference in tensile strenght is reflected in the price.

Oh well, back to the drawing board.

[germanrob82]

oem bolts are comparable and metric blues are quite a few rockwells stronger and still stretch the bolts. So comparing claming force versus tensile strength is pointless. The stud itself will stretch before the nut and spacer give out causing the head to lift and so on and so forth.... reguardless of what the clamp force style is so its a really mute point.
I'm going with ARP studs: http://www.ebay.com/itm/BMW-M20-ARP-...item48416c90e0

[einstein57]

Factory bead bolts are stonger then those studs. I would not use them.

[RobertK]

Not gonna chance it if there is that much difference in the two.i allready had a metric blue broke off in the block, dont want to do this again.

I honestly doubt you would have the same problem with the studs. Worst case you strip out the threads or nut. I wouldn't hesitate to use them. I actually plan to use them on my S52 refresh.

There is a difference in that that bolts are pulling in their center and studs / nuts utilize more downward clamping force.

[TS87325IS]

Not gonna chance it if there is that much difference in the two.i allready had a metric blue broke off in the block, dont want to do this again.