914 - bus flywheel to crank bolts

[Piledriver]

Anyone in the states selling those BAS bolts?

I guess I don't really need them tomorrow...

[dstar5000]

Anyone in the states selling those BAS bolts?

I guess I don't really need them tomorrow...

YOU DONT NEED THEM AT ALL UNLESS YOU ARE MAKING OVER 250-275 HP...

DON

[Ol'fogasaurus]

B.A.S bolts from Ahnendorp.com have to be to a (probably an ISO [International Specification Office]) spec.

I tried looking them up and since my German is 50 years old w/o using a word of it since I now can't understand it. Doing other searches talk about them but the spec they are made to or dimension are not there.

Ream-to-fit, while not a common thing that most people do, is it not out of reason as long as the under head radius is also taken care of. What is the standard strength ratio as it is not the same numbers as ASME (ISO) or MIL standards use. If you can get a strength of cross-reference between the two then they might be easier to get here in the states (and possibility maybe a bit cheaper ) as I think the metric system standards are produced here like our standards are produced off-shore.

Lee

[Piledriver]

Anyone in the states selling those BAS bolts?

I guess I don't really need them tomorrow...

YOU DONT NEED THEM AT ALL UNLESS YOU ARE MAKING OVER 250-275 HP...
DON

2.5l, HAM heads, Alfing crank, crower rods.... e85 twin gt22v turbos... not planning on oodles of boost because t4 heads, but it should easily clear 275 hp by a bit...
I will probably go with the ARP bolts mentioned earlier as its going into a beefed 090 automatic.
It can be built to take really stupid power ~indefinately, unlike any other ACVW trans, regardless of how much $$$ you throw at them.

May take oldfogs advice and see if anybody makes a grade 12 or better 12mm socket head cap screw with a shoulder for ream to fit...

[Ol'fogasaurus]

Sorry I got mouthy! https://www.bing.com/search?q=metric+ve ... 4d054a0a9a

I'll try to stop butting in.

Lee

[Piledriver]

Sorry I got mouthy! https://www.bing.com/search?q=metric+ve ... 4d054a0a9a

I'll try to stop butting in.

Lee

? You are not butting in.

Stock bolts are metric grade 12.9, which is more or less equivalent to SAE grade 8.
Not sure what the pure unobtanium bolts work out to in some std grade.
The design etc may be more important, you are still bolting through a hunk of cast iron or at best maybe ~1040 steel.
...unless you go with one of the chromemoly flywheels, I dangerously assume Kennedy makes decent versions, the Chinese can make perfectly good ones at some price point, IIRC there is even a CrMo 228mm version out there. How does CrMo work as a friction surface?

[Ol'fogasaurus]

Sorry I got mouthy! https://www.bing.com/search?q=metric+ve ... 4d054a0a9a

I'll try to stop butting in.

Lee

? You are not butting in.

Stock bolts are metric grade 12.9, which is more or less equivalent to SAE grade 8.
Not sure what the pure unobtanium bolts work out to in some std grade.
The design etc may be more important, you are still bolting through a hunk of cast iron or at best maybe ~1040 steel.
...unless you go with one of the chromemoly flywheels, I dangerously assume Kennedy makes decent versions, the Chinese can make perfectly good ones at some price point, IIRC there is even a CrMo 228mm version out there. How does CrMo work as a friction surface?

You are now above my expertise on that. I had limitation as to what I could and could not do (mostly because of my lack of a full education) and because fastener design was up to the engineers and the specialists. I was directed to search for fasteners that met certain specifications needed so, in this case, I did a quick search: https://www.bing.com/search?q=How+does+ ... bbeac15ccb

The company I worked for was very large and I was one of those who got moved around to and when the need was so I learned a lot of things others may not have including the requirements of the National, Military and International standards groups. I also checked other's work for completeness but not form, fit or function but I could ask questions of the engineers and specialists so I picked up a lot of things others may not have had access to.

Every-so-often I revert back to my working days and shoot my face off based the jobs I had; e.g., butt in on things.

Lee

[Clatter]

https://lnengineering.com/type-4-store/ ... t-set.html

THOSE ARE CLUTCH PLATE BOLTS....

DON

No need to shout, there, Sunshine.. We're all right here.


They sure -seem- to fit..


What are these, then?
https://lnengineering.com/type-4-store/ ... bolts.html

Still, the low price doesn't inspire confidence.
And 10.9 isn't 12.9..

I'm no metallurgist,
But sometimes can't too hard mean brittle?

[Piledriver]

The last link is pressure plate bolts, again, according to text.
only problem is the picture is of cap screws think the heads are too thick to work.

[Ol'fogasaurus]

Yes, cap screws do have that tradeoff: you sacrifice the flanges for the wrench for the smaller dia. but you end up with a taller bolt head needed for the Allen head tool. I'm not 100% sure anymore but I think the underside of the standard bolt, if you were to ignore the flanges, I would suspect the dia. of load bearing surfaces of both styles of bolts would be very close to the same dia..

As a double check, on the standard bolt measure the area where the flanges are straight across to the next flange flush then compare the measurement to the dia. of the head of the cap screw you should come out pretty darn close (you should also be able to see the dia. of the load surface inside of the wrench flanges). The thickness of the 6-point bolt heads can vary also.

I've never been directly involved with the design of a cap screw/bolt so I can't be of more help there.

Depending on the design of the flywheel (reliefs), a fairly flat bellhousing is most likely going to be a problem and I don't think you want to machine in a grove for the bolt heads either .

Lee

[dstar5000]

Anyone in the states selling those BAS bolts?

I guess I don't really need them tomorrow...

YOU DONT NEED THEM AT ALL UNLESS YOU ARE MAKING OVER 250-275 HP...
DON

2.5l, HAM heads, Alfing crank, crower rods.... e85 twin gt22v turbos... not planning on oodles of boost because t4 heads, but it should easily clear 275 hp by a bit...
I will probably go with the ARP bolts mentioned earlier as its going into a beefed 090 automatic.
It can be built to take really stupid power ~indefinately, unlike any other ACVW trans, regardless of how much $$$ you throw at them.

May take oldfogs advice and see if anybody makes a grade 12 or better 12mm socket head cap screw with a shoulder for ream to fit...

1 HAVE CAT(CATERPILLAR) 12.9 CAP HEAD BOLTS THAT YOU WOULD HAVE TO *SAND*/REAM TO FIT....

DON

[dstar5000]

https://lnengineering.com/type-4-store/ ... t-set.html

THOSE ARE CLUTCH PLATE BOLTS....

DON

No need to shout, there, Sunshine.. We're all right here.

I CANT SEE VERY WELL AND ALWAYS TYPE IN CAPS. I AM NOT SHOUTING.
WHEN I STARTED IN COMPUTERS, WE DIDNT HAVE LOWER CASE SO IT WAS EASY TO FALL BACK ON....
THE ONLY REASON THAT YOU THING THAT I AM SHOUTING IS BECAUSE SOMEONE TOLD YOU THAT ALL CAPS IS SHOUTING.
STOP LISTENING TO EVERYONE ELSE.....
DON

[dstar5000]

[/quote]
I'm no metallurgist,
But sometimes can't too hard mean brittle?
[/quote]

12.9 IS THE CLAMPING PRESSURE...

DON

[Steve Arndt]

Just saw these:

https://www.thesamba.com/vw/classifieds ... id=1549528

[Clatter]

Just saw these:
https://www.thesamba.com/vw/classifieds ... id=1549528

Interesting.. 10.9 again.