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Here's A Chart Showing "Normal" Compression Values for Late 20's and Early 30's Cars


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As you know, there are various ways of calculating what normal compression is for specific engines, based on their compression ratio ( if known) , etc. Some Dykes manuals have a range, as do some types of compression test gauges. 

  Attached is the first chart I have found that lists "normal" values for SPECIFIC CARS of the late 1920's and 1930's. It was found among some papers that came with a Cord that I recently purchased. I hope that forum users will find it of some value. I was surprised at how low the values were for some cars. ( less than 80 psi ). This may even give some owners of those cars a little more peace of mind. Click on it and zoom if required and it will be easily readable.

post-142660-0-63180300-1443981662_thumb.

Edited by Guest (see edit history)
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Unfortunately, the computer will not let me save the chart and it is a bit blurry. Could you please tell me what it says for the 1931 Dodge 6? Thanks.

 

1930-31 D-D-6      80 psi

1931 6 and 8 late series  86 psi

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Here's what worked for me.

Open the attachment to view it.  On the bottom right corner of the chart is a SAVE and a CLOSE button. Click on the save button and the chart opens in a new tab. Right click the newly opened chart and one of your choices is "save image as".  This will let you save the image to where ever you like on your computer.

 

Hope this helps.

 

Bill

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  • 11 months later...
On 10/4/2015 at 2:01 PM, 31 Caddy said:

As you know, there are various ways of calculating what normal compression is for specific engines, based on their compression ratio ( if known) , etc. Some Dykes manuals have a range, as do some types of compression test gauges. 

  Attached is the first chart I have found that lists "normal" values for SPECIFIC CARS of the late 1920's and 1930's. It was found among some papers that came with a Cord that I recently purchased. I hope that forum users will find it of some value. I was surprised at how low the values were for some cars. ( less than 80 psi ). This may even give some owners of those cars a little more peace of mind. Click on it and zoom if required and it will be easily readable.

Compression chart.jpg

Can this be posted at a higher resolution than a thumbnail picture?

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