| Author |
Message |
    
raa
Member
Username: raa
Post Number: 23
Registered: 02-2007
| | Posted on Saturday, February 05, 2011 - 09:41 pm: | 
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Has anyone ever seen one of these indicators for a internal combustion engine. I guess I've lead a sheltered live and have never seen one. There are plenty of steam engine indicators around but how many of these are there?
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johnoxley
Member
Username: johnoxley
Post Number: 15
Registered: 04-2010
| | Posted on Saturday, February 05, 2011 - 10:32 pm: |
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Hi - Yours lok like steam engine indicator. I have a similar model that has Aluminium alloy arms - these are lighter and designed for higher speed diesels. Today designers use electronic versions. They are primarily used to show valve and amnission/injection events plotted on small cards. |
russell
Advanced Member
Username: russell
Post Number: 45
Registered: 08-2003
| | Posted on Sunday, February 06, 2011 - 08:28 am: |
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Very nice Raa. I think it's a steam one. Any of the real seers out there know for certain? I have a similar but all brass one -obviously for a much slower revving engine. The springs are used for the differing pressures in a range of engines. |
johnoxley
Member
Username: johnoxley
Post Number: 16
Registered: 04-2010
| | Posted on Sunday, February 06, 2011 - 04:33 pm: |
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Yes - different springs used for different pressures - usual triple expansion expansion has steam pressure say 180 psi for High Pressure cylinder, 40 psi for Intermediate Pressure cylinder and 10 psi for the Low Pressure cylinder. You could use the same spring for all, but the HP diagram would be almost flat and the LP diagram would exceed the range of the instrument. See http://www.oldengine.org/members/diesel/Indicator/Indicator3.htm |
raa
Member
Username: raa
Post Number: 24
Registered: 02-2007
| | Posted on Monday, February 07, 2011 - 09:25 am: |
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Many thanks for all the input.
When I saw the label saying the indicator was for --internal combustion engines-- I was surprised because I thought these thought these indicators were only used on steam engines which are external combustion.
Dick |
