M20 aftermarket head bolts?

[Joseph~]

Your opinion on aftermarket head bolt for the M20?

Thank You

Joseph

[MR 325]

Can you be more specific with the question?

[dustyperez]

arp or bust

[Joseph~]

Can you be more specific with the question?

What is available on the market.

Genuine BMW bolts - I did not look up the cost.

ARP stud kit jobber price $285.52

Metric Mechanic Socket Head Bolt Set price $140.00

Grade 12.9, 10mm X 150mm socket head bolts from industrial supplier at $3.00 per bolt a set cost $42.00

Any other bolts on the market?

[SkiFree]

Joseph what is your opinion on current healthcare plans?

Seriously, if you want an actual answer you need to give a little more context (remember who/what/when/where/why?)

[Joseph~]

[SNIP}Joseph what is your opinion on current healthcare plans?...........{SNIP])

I have no opinion on healthcare plans, as I do not require that information nor do I make a decision on my healthcare plan. As the plan in not available to the general public.

You have to write a dissertation to get an opinion on a product / brand a person used /uses?

[SkiFree]

Jeepers

Should I put the time and effort into a thoughtful response if the person asking the question doesn't care enough to provide a little background?

[Cabriolet]

The BMW head bolts are the best you can do for bolts.
They aslo aren't that expensive.

the arp studs are about 3mm too long and on some casts touch the valve cover. (they do on my car)

Raceware (RTE) made the only m20 specific head studs.

[Joseph~]

The BMW head bolts are the best you can do for bolts.
They aslo aren't that expensive.

the arp studs are about 3mm too long and on some casts touch the valve cover. (they do on my car)

Raceware (RTE) made the only m20 specific head studs.

Thank You for the information.

Raceware head stud set for the M20 cost $329.00.

Looked up Genuine BMW head bolts, part number 11121726478
Set of 14 TORX bolts list price at $32.10

Joseph

[MR 325]

What is available on the market.

Genuine BMW bolts - I did not look up the cost.

ARP stud kit jobber price $285.52

Metric Mechanic Socket Head Bolt Set price $140.00

Grade 12.9, 10mm X 150mm socket head bolts from industrial supplier at $3.00 per bolt a set cost $42.00

Any other bolts on the market?

You can get OEM bolts for around $25 online. They're much nicer than any other aftermarket head bolt. I also would never use a generic bolt like you listed above. You're a bit off on that ARP cost. They go for around $230 retail.

the arp studs are about 3mm too long and on some casts touch the valve cover. (they do on my car)

ARP now makes a specific kit for the M20 engine. They have for a couple years at least.

They are a perfect fit without issue.

[Joseph~]

Fwiw

wrote and posted ....[SNIP}"I also would never use a generic bolt like you listed above"....{SNIP]

Grade 12.9 bolts are NOT generic. Covered under ASTM F568 Specification. Grade 12.9 bolts/studs are manufactured from quenched & tempered alloy steel having a minimum tensile strength (min) of 1220 Mpa. Compared to Class 8.8, medium carbon steel; quench and tempered, tensile strength (min) 800 Mpa.

Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing.

[MR 325]

They ARE generic in the fact that they haven't been designed for the specific use of M20 head installation.

[15Michaeljoseph]

Boys! Boys!

Joseph, my esteemed and honorable friend, the fact is, the genuine BMW spec part is the cheapest option. They're not going to break. They're not going to be subjected to anything close to a 1220 Mpa. You don't need the 12.9 ASTM F568 certified bolt. Use the same part that the guys who built the motor in the factory used. do it in their memory, a tribute to the BMW elders. show your respect. light a candle.


--Mike

[Joseph~]

[SNIP}..... do it in their memory, a tribute to the BMW elders. show your respect. light a candle....{SNIP]

--Mike

OK, I will light a candle.



Joseph

[Ether-D]

So at what psi do the OEM bolts become inadequate? I've read that it's mostly about the tune. Let's assume that you have a perfect tune, how many psi can be safely run (ballpark)? I hear 10 being tossed around a lot. Is that just because it's nice and round?