Does anyone know some good materials too use in making of racing cylinders
for two strokes?

The problem is that alcohol and nitro mixes create unusual high
temperatures.
It must altso tolerate punishing high revs' (20,000 rpm )

And the piston?

Titanium perhaps?

"Haaken Hveem" wrote in message
...
It must altso tolerate punishing high revs' (20,000 rpm )

And the piston?

Titanium perhaps?

I would think a beryllium alloy could do something here, but I guess it's
just too feared and expensive to try.
Maybe a lithium aluminum alloy...

Tim

--
"California is the breakfast state: fruits, nuts and flakes."
Website: http://webpages.charter.net/dawill/tmoranwms

Haaken Hveem wrote:

Does anyone know some good materials too use in making of racing cylinders
for two strokes?

The problem is that alcohol and nitro mixes create unusual high
temperatures.
It must altso tolerate punishing high revs' (20,000 rpm )

And the piston?

Titanium perhaps?

Try here; http://www.mt-llc.com/index_home.shtml

There are lots of other companies that do similar work.

--
__
Pete Snell
Royal Military College
Kingston Ontario


The reasonable man adapts himself to the world;
the unreasonable one persists in trying to adapt the world to himself.
Therefore all progress depends on the unreasonable man.
- George Bernard Shaw

Haaken Hveem nospam wrote:
Does anyone know some good materials too use in making of racing
cylinders
for two strokes?

The problem is that alcohol and nitro mixes create unusual high
temperatures.
It must altso tolerate punishing high revs' (20,000 rpm )

Don't know if it's useful, but model airplane engines burning alcohol &
nitro typically use an aluminum piston running in a chrome plated brass
cylinder liner (typically in an aluminum block). No rings - it's a
tight fit cold, and works out via the thermal expansion.

The usual stock cylinder material on sachs two stroke is cast iron.
Kreidler uses crome plated.


skrev i melding
ups.com...
Haaken Hveem nospam wrote:
Does anyone know some good materials too use in making of racing
cylinders
for two strokes?

The problem is that alcohol and nitro mixes create unusual high
temperatures.
It must altso tolerate punishing high revs' (20,000 rpm )

Don't know if it's useful, but model airplane engines burning alcohol &
nitro typically use an aluminum piston running in a chrome plated brass
cylinder liner (typically in an aluminum block). No rings - it's a
tight fit cold, and works out via the thermal expansion.

I made a pair of sleeves from DuraBar . Runs great and no wear on a two
stroke outboard.

Pete


"Haaken Hveem" wrote in message
...
The usual stock cylinder material on sachs two stroke is cast iron.
Kreidler uses crome plated.


skrev i melding
ups.com...
Haaken Hveem nospam wrote:
Does anyone know some good materials too use in making of racing
cylinders
for two strokes?

The problem is that alcohol and nitro mixes create unusual high
temperatures.
It must altso tolerate punishing high revs' (20,000 rpm )

Don't know if it's useful, but model airplane engines burning alcohol &
nitro typically use an aluminum piston running in a chrome plated brass
cylinder liner (typically in an aluminum block). No rings - it's a
tight fit cold, and works out via the thermal expansion.

"Haaken Hveem" wrote in message
...
Does anyone know some good materials too use in making of racing cylinders
for two strokes?

The problem is that alcohol and nitro mixes create unusual high
temperatures.
It must altso tolerate punishing high revs' (20,000 rpm )

And the piston?

Titanium perhaps?

If you want information from professional engineers who research this
subject with the aid of serious money and well-equipped labs, it's a subject
that has come up from time to time in SAE white papers. You have to pay for
them, but it's cheap if you're serious about building something.

Go to the SAE site and you'll find the publications.

--
Ed Huntress

You didn't indicate a displacement size. Assuming you are interested in
something up to about 10cc displacement, but most likely in the 1cc -
2.5 cc displacement range:

4032 AL for the cylinder with chrome plating on the bore

A high silicon (20%) AL sintered piston (not quite, but almost unobtainium)

2024 AL for the rod with the lower end bushed or perhaps 7068 AL without
a bushing

2024 AL T3 or T4 for the case if you machine it from a block

390 AL aged to T6 if you cast it

Stay away from 6061 and 7075 for model airplane engines. 6061 moves too
much under pressure and heat. 7075 loses a lot of its desirable
properties when heated much over 125 to 150 degrees C

Titanium has a lot of nice properties except it has a tendency to gall
when there is a moving interface. It's temperature expansion ratio is
very different that the normal bushing materials, AL, and steels used in
model engines which bring a whole new set of problems.

Ed is right, the SAE has some very good materials. Send them lots of
money and brush up on your math. Those reports have a wealth of
information but are not written for the non-engineering type.

Dave Rolley

Ed Huntress wrote:
"Haaken Hveem" wrote in message
...

Does anyone know some good materials too use in making of racing cylinders
for two strokes?

The problem is that alcohol and nitro mixes create unusual high
temperatures.
It must altso tolerate punishing high revs' (20,000 rpm )

And the piston?

Titanium perhaps?


If you want information from professional engineers who research this
subject with the aid of serious money and well-equipped labs, it's a subject
that has come up from time to time in SAE white papers. You have to pay for
them, but it's cheap if you're serious about building something.

Go to the SAE site and you'll find the publications.

--
Ed Huntress

"Dave Rolley" skrev i melding
...
You didn't indicate a displacement size.
about 60-70cc
Assuming you are interested in
something up to about 10cc displacement, but most likely in the 1cc -
2.5 cc displacement range:

4032 AL for the cylinder with chrome plating on the bore

A high silicon (20%) AL sintered piston (not quite, but almost
unobtainium)

2024 AL for the rod with the lower end bushed or perhaps 7068 AL without
a bushing

2024 AL T3 or T4 for the case if you machine it from a block

390 AL aged to T6 if you cast it

Stay away from 6061 and 7075 for model airplane engines. 6061 moves too
much under pressure and heat. 7075 loses a lot of its desirable
properties when heated much over 125 to 150 degrees C

Titanium has a lot of nice properties except it has a tendency to gall
when there is a moving interface. It's temperature expansion ratio is
very different that the normal bushing materials, AL, and steels used in
model engines which bring a whole new set of problems.

Ed is right, the SAE has some very good materials. Send them lots of
money and brush up on your math. Those reports have a wealth of
information but are not written for the non-engineering type.

Dave Rolley

Ed Huntress wrote:
"Haaken Hveem" wrote in message
...

Does anyone know some good materials too use in making of racing
cylinders
for two strokes?

The problem is that alcohol and nitro mixes create unusual high
temperatures.
It must altso tolerate punishing high revs' (20,000 rpm )

And the piston?

Titanium perhaps?


If you want information from professional engineers who research this
subject with the aid of serious money and well-equipped labs, it's a
subject
that has come up from time to time in SAE white papers. You have to pay
for
them, but it's cheap if you're serious about building something.

Go to the SAE site and you'll find the publications.

--
Ed Huntress

Most hi-performance two-stroke cylinders we use are aluminum with a
NiCom plated bore.
http://www.usnicom.com/Why_NiCom_/why_nicom_.html
Pistons are forged aluminum.
http://www.wiseco.com/faqs/automotive.html#Anchor-22870
David



"Haaken Hveem" wrote in message
...
Does anyone know some good materials too use in making of racing cylinders
for two strokes?

The problem is that alcohol and nitro mixes create unusual high
temperatures.
It must altso tolerate punishing high revs' (20,000 rpm )

And the piston?

Titanium perhaps?