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NVHIS-1200, 1486 ci Cummins Supercharged V-12


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  #1  
Old 06-01-2018, 09:54:19 AM
Sooty Jim Sooty Jim is offline
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Default NVHIS-1200, 1486 ci Cummins Supercharged V-12

Gents, would someone with any early '50s spec books look to see if they can find the power and torque specs for a Cummins HVHIS-1200? It's the supercharged version of the NVHI, or NVHIB-1200 V-12 (sometimes seen as NVHI-1486) which is a 1486 ci V-12. The '55 turbocharged version was 600 hp @ 2100 maximum and the NA version was 400 hp maximum. Introduced in '49 and discontinued in '74, though the 1710 ci version began in 1960.
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Old 06-01-2018, 12:26:30 PM
Vanman Vanman is offline
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Default Re: NVHIS-1200, 1486 ci Cummins Supercharged V-12

That sounds like exactly two of mine! My book lists the supercharged 743 ci as high as 320 hp, and turbocharged as high as 335. Both at 2100. I have no idea if those hp figures would simply be doubled, but it seems logical.
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Old 06-01-2018, 11:01:11 PM
enginenut2 enginenut2 is offline
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Default Re: NVHIS-1200, 1486 ci Cummins Supercharged V-12

Jim, I only find reference of the v12 supercharged 1486 in my "Diesel Engine Catalog" volume 20 of 1955-1956,
chart listing the NVHIS-1200--max HP: 550@2100, cont.:350@1800. The NVHBIS-1200--shown as the same.
The engines w/ I in the model designation are stated to be "industrial" with mounting feet.
The 12 cyl supercharged are not shown in the marine or automotive charts.

However in the volume 19 the NVHMS-1200 is shown in the marine chart @520 pleasure boat HP @ 2100 and 425 work boat HP @ 1800.
Same volume has a performance chart for the supercharged NVHS-1200 showing 550 HP @2100 R/M and max torque 1450 @ 1600 R/M

Last edited by enginenut2; 06-01-2018 at 11:13:36 PM. Reason: more
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Old 06-02-2018, 05:56:08 AM
Sooty Jim Sooty Jim is offline
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Default Re: NVHIS-1200, 1486 ci Cummins Supercharged V-12

That's helpful! Though I have the '55 and '56 #20 too and somehow missed it ( : < 0).
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Old 06-06-2018, 12:00:37 AM
dieselsteveo dieselsteveo is offline
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Default Re: NVHIS-1200, 1486 ci Cummins Supercharged V-12

Jim,
Our NVHIS-1200 tested out at 467hp @ 1800rpm
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