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38 V16 combustion chamber volume

Started by robert G. smits, June 01, 2023, 12:29:47 PM

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robert G. smits

June 01, 2023, 12:29:47 PM
Does anyone know the combustion chamber volume at TDC for a single piston.  Trying to revive a motor that has sat for 35 years and I want to know how much ATF/Acetone mix I can safely put in each hole for a couple weeks before I try to spin it.  Thanks
R. Smits, #2426
23 Cad 7P Touring
32 Cad 5P Coupe
38 Cad 90 Series
41 Cad 63 Series
58 Cad Eldo Barritz
The average man can take care of one Woman and two Cadillacs, Al Edmond AACA Past President

Roger Zimmermann

#1
June 02, 2023, 03:22:21 AM
Knowing the total displacement and compression ratio, it should be possible to calculate the combustion chamber volume or am I wrong?
1956 Sedan de Ville (sold)
1956 Eldorado Biarritz
1957 Eldorado Brougham (sold)
1972 Coupe de Ville
2011 DTS
CLCMRC benefactor #101

Chris Cummings

#2
June 02, 2023, 01:24:32 PM
Robert, I would ask Brad Ipsen or Terry Wenger (both in the directory) who know most of what there is to know about 1938-1940 V-16s.  Good luck!

Chris Cummings

tmdeturck

#3
June 03, 2023, 07:58:42 AM
Quote from: Roger Zimmermann on June 02, 2023, 03:22:21 AMKnowing the total displacement and compression ratio, it should be possible to calculate the combustion chamber volume or am I wrong?
Should be:
Vc = Vd/ (Cr-1)

So for the 1938 v16, Vd = 431 cu in and Cr = 6.8, so total combustion chamber volume would be 74.3 cu in, or 4.6 cu in per cylinder.

This would get a bit complicated however, as the pistons won't all be at TDC though.  Is there a concern with pulling all the plugs and just filling until the ATC/acetone mix just comes out each plug hole?
1963 Series 6229
1937 Series 6019

Warren Rauch #4286

#4
June 03, 2023, 08:47:27 AM
   

   I agree with tmdeturck ,just fill them up!
   How much will it take? You may be wondering. Half of each cylinder will be full at any given time ,so 431 divided by 2 is 215.5 cubic inches. Plus the 4.6 above each piston is 74.3, total 289.8 cubic inches. Conversion to ounces times .5555 .is 160.99 ounces or 5.03 Quarts.
Warren
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