What steel for I/C engine cylinders

[Mo deller]

The designer of the Vega I am trying to build has specified EN8m but I cant find a supply for the few inches I need.
Just wondering if anything else is suitable. They are one piece and lapped with a cast iron ring in the piston.
It also shows a couple of what he calls heavy metal inserts in the crank web to balance. I cant find a supply for that either.

Any thoughts anyone?

Mo ???

 

[tel]

The designer of the Vega I am trying to build has specified EN8m but I cant find a supply for the few inches I need.
Just wondering if anything else is suitable. They are one piece and lapped with a cast iron ring in the piston.
It also shows a couple of what he calls heavy metal inserts in the crank web to balance. I cant find a supply for that either.

Any thoughts anyone?

Mo ???

Lead or gold? Can't help with the EN8m

 

[Mo deller]

Ahh yes brain went wonky. What I meant to say was High density metal. He says it has a specific gravity of 17 which is more than lead.

Mo

 

[DavesWimshurst]

Mo,
For what it's worth tungsten carbide has a specific gravity of 15.8 according to:
http://en.wikipedia.org/wiki/Tungsten_carbide
It may be available in a suitable shape as a boring bar insert or the shank of a broken solid carbide end mill.
Also I have seen the idea raised in one of the model magazines of using exotic materials such as depleted uranium! We don't need a toxic waste site in our own shops!

Sorry about the name mix up, eyes don't always work so good before my coffee.
Dave

 

[Bluechip]

Hi Mo Deller

IIRC it's a tungsten alloy once sold by GLR ( UK )

This is their site

http://www.modelmakingsupplies.co.uk/

The material does not seem to be there anymore, neither does the site seem to be 'searchable'. ???

You could e-mail them to enquire I suppose. I think they were the characters who did it, but I may be wrong ..

EN8 ? Livesteammodels Normally sell by the metre though, don't know anyone who does 6 "

Dave

 

[Mo deller]

Hi Mo Deller

IIRC it's a tungsten alloy once sold by GLR ( UK )

This is their site

http://www.modelmakingsupplies.co.uk/

The material does not seem to be there anymore, neither does the site seem to be 'searchable'. ???


Dave

Hello Dave,

Yes it was GLR quoted as supplier and I was dissapointed with what I found on the web. As you say no mention of the material there or anywhere else I have searched. I'll have another look and contact them but I am not confident it'll do any good.

Thanks
Peter.

 

[GrahamC]

I had a reference to EN8 steel and near equivalents but can't put my finger on it at the moment.

However, if you have never found Ron Chernich's web site on Model Engineering and Model IC Engine Projects you will find much of interest.

http://www.modelenginenews.org/

On that web site is a FAQ by Roger J Schroeder which contains this bit on materials:

http://www.modelenginenews.org/rsch/build.html#A7

cheers, Graham

 

[Jasonb]

EN8 in 12" lengths from these, 6" if over 1" dia

http://www.metal2models.btinternet.co.uk/bms1.pdf

http://www.collegeengineering.co.uk/Materials/en8.htm

And this post on another group by someone who sounds like they are making a similar engine, he still posts regularly so you could ask on the group what he used in the end.

http://www.rcgroups.com/forums/showthread.php?t=714981&highlight=heavy+metal

Jason

 

[Kermit]

EN8 - Med. Carbon Steel

EN8e-Med. Carbon/Manganese Steel

EN8m-Semi-Free cutting steel closely equivalent to a SAE1137 or SAE1140

from HERE.

Kermit

 

[Mo deller]

However, if you have never found Ron Chernich's web site on Model Engineering and Model IC Engine Projects you will find much of interest.

http://www.modelenginenews.org/

On that web site is a FAQ by Roger J Schroeder which contains this bit on materials:

http://www.modelenginenews.org/rsch/build.html#A7

cheers, Graham

Thanks Graham, I have this site in my favourites but hadn't found the section on materials so that was great thanks.

Thanks for the other links and info guys I'll check them out.

Mo

 

[Mo deller]

GLR do have EN8m but no longer stock the HD metal

 

[Seanol]

Guys,
When we balanced crankshafts in racing engines we use "Mallory Metal". It is denser (heavier?) than steel and is used to help balance by adding weight by tangential drilling the crank web.

There is a company called Goodsons that should have it (at least here in the US)
Hope that helps,
Sean

 

[Mo deller]

Guys,
When we balanced crankshafts in racing engines we use "Mallory Metal". It is denser (heavier?) than steel and is used to help balance by adding weight by tangential drilling the crank web.

There is a company called Goodsons that should have it (at least here in the US)
Hope that helps,
Sean

Thanks, I looked it up and it seems to be a trade name for the group of tungsten alloys that the stuff I need seems to be. I havn't yet found a stockist here in the uk though. I will ring round locally when I get a round tuit but have lost the drive for the moment.

Peter.