Today's Message Index:
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1. 02:59 AM - Cylinder sizes with M 14 engines (Richard Goode)
2. 06:00 AM - Re: Cylinder sizes with M 14 engines (George)
Message 1
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| Subject: | Cylinder sizes with M 14 engines |
Further to my earlier posting about this, I thought it might be helpful
for people to know little more about the cylinder sizes. Importantly,
the new cylinders have a layer of nitride on the cylinder =93 this
is a hard metal/ceramic compound that is fused onto the cylinder wall,
but in a very thin layer. This thinness causes a significant problem in
that it only gives a limited ability to have over-sized cylinders before
cutting through the nitride layer. So the official dimensions are:
Standard cylinder diameter: 104.98 mm
First oversize (R1): 105.10 mm
Second oversize (R2) 105.18 mm.
So you can see that the additional oversize cylinders are actually very
little increase in diameter. Our view is that there is sufficient
nitride layer to make a third oversize possible without cutting through
the nitride into the base steel. But in the long term it is clear that
we will need to be thinking of extending the lives of the cylinders. A
problem with nitriding is that the cylinder head in aluminium has to be
removed in order to re-nitride the cylinder, so this is impractical. The
other solution which we are now adopting is to coat the internal
cylinder walls with Nikasil =93 a product not similar to nitride,
but widely used in the automotive industry and with the advantage that
it can be applied to cylinders without removing the cylinder head.
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: <mailto:richard.goode@russianaeros.com>
richard.goode@russianaeros.com
<http://www.russianaeros.com> www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
Message 2
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| Subject: | Cylinder sizes with M 14 engines |
The Motorstar Factory in Romania still produces new cylinders. They have
had some success in installing new cylinder barrels as well. They are
currently working on the Nikasil process.
Barretts has been using the Nikasil process as well. It has an advantage
they resist corrosion much better than nitrided cylinders. It has been
used on continental and Lycoming cylinders for over 20 years with good
success.
George Coy
MotorstarNA
714 Airport Rd.
Swanton VT 05488
802-868-5633 off
802-363-5782 cell
<mailto:george.coy@gmail.com> george.coy@gmail.com
<http://motorstarna.com/> http://motorstarna.com/
SKYPE george.coy
From: owner-yak-list-server@matronics.com
<owner-yak-list-server@matronics.com> On Behalf Of Richard Goode
Sent: Monday, March 21, 2022 5:59 AM
Subject: Yak-List: Cylinder sizes with M 14 engines
Further to my earlier posting about this, I thought it might be helpful
for people to know little more about the cylinder sizes. Importantly,
the new cylinders have a layer of nitride on the cylinder =93 this
is a hard metal/ceramic compound that is fused onto the cylinder wall,
but in a very thin layer. This thinness causes a significant problem in
that it only gives a limited ability to have over-sized cylinders before
cutting through the nitride layer. So the official dimensions are:
Standard cylinder diameter: 104.98 mm
First oversize (R1): 105.10 mm
Second oversize (R2) 105.18 mm.
So you can see that the additional oversize cylinders are actually very
little increase in diameter. Our view is that there is sufficient
nitride layer to make a third oversize possible without cutting through
the nitride into the base steel. But in the long term it is clear that
we will need to be thinking of extending the lives of the cylinders. A
problem with nitriding is that the cylinder head in aluminium has to be
removed in order to re-nitride the cylinder, so this is impractical. The
other solution which we are now adopting is to coat the internal
cylinder walls with Nikasil =93 a product not similar to nitride,
but widely used in the automotive industry and with the advantage that
it can be applied to cylinders without removing the cylinder head.
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: <mailto:richard.goode@russianaeros.com>
richard.goode@russianaeros.com
www.russianaeros.com <http://www.russianaeros.com>
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
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