3/8 cast iron bar
Turbo Mini Forums

I'm after some cast iron bar of 3/8 dia to tap to 3/8 UNC to plug the head studs on my K1200 conversion. Has anybody got some lying about after their conversion?

My only other option is to turn down some bar of around 25mm down to 3/8".

Cheers

Have you tryed rapid metals on Bayton road mate?

Edited by 1380rich on 2nd May, 2013.

Avon 2010 class c 3rd
Avon 2011 class c 2nd 13.8 @ 98mph

Would some 3/8 UNC threaded steel rod not be suitable ?

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

i couldn't find any either and resorted to turning a bigger bit down,

I would also like some if you find a source!

In terms of thermal expansion steel should be fine. I doubt it would make a difference.

I feel its probably going to be a case of whats technically correct vs what works

But well. The metal in threaded bars ive found is generally shite.

Me buddy :)

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Go on then has anyone used steel to plug their blocks? What do the companies that offer the conversions use?

Edited by minimole23 on 4th May, 2013.

Has anyone just cut down a standard head stud to pug the block, or are they too hard and will cause the drill bit to wander? Tempted to just use steel bar to plug my block otherwise.

I've been trying to find some cast iron without success here in Oz too. Seems like it's going to have to be turned down from a larger diameter.

Edit: I'll be using steel for all water & oil ways, and for the 4 studs that don't overlap the new BMW ones. Cast Iron (once I find some) for the two end studs that do overlap the new ones.

Edited by poida97 on 25th Sep, 2015.

Give MC Mills in Barnsley a ring, I bet pound to a penny they can get you some 3/8 unc threaded bar, i bought some 5/8 unc threaded bar tutha week.

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

01226 732566

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

I use steel in my blocks, I've done about 6 now, no issues ever.

Team www.sheepspeed.com Racing

Thanks for that Mike. Jim good to know.

Interesting Jim - so just to clarify, you use steel to block the two end studs that do overlap the new ones? If so, does that mean that the wandering drill worry is not really an issue?

Hope that is the case, it will save a lot of d!cking around trying to find and then machine & thread cast iron.

how amount milling rather than drilling,

That was my thought too Joe. Mill the holes and an end mill on a rigid milling machine is unlikely to wander if you take it steady.

If you centre drill them and go down with a slot drill you should be fine.

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www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

I mill the holes with a 8mm endmill, and do two finish cuts to make sure the whole is round

Team www.sheepspeed.com Racing

I ended up milling an old camshaft, for the 5 holes that need to drill, all the other use brass.