Detroit Experts? - Diesel Truck Forum -
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post #1 of 3 (permalink) Old 11-06-2009, 04:49 PM Thread Starter
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Detroit Experts?

I am in the midde of rebuilding Detroit 4-53. The original motor is an a series with 17:1 compression and 2 valve per cylinder head. I would to up the HP. The newer 4-53 uses a 4 valve head and higher compression 21:1. My question is can I use the higher compression rebuild kit and still use 2 valve head or can it be done.?
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post #2 of 3 (permalink) Old 12-11-2009, 02:50 AM
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Sure can ! What's the application ? Is this an Oliver 1900 by chance ? 2 valve head engines were speed limited I believe , but have to check some old 70s vintage spec sheets to verify . 4 valve head engines were governed at 2800 full load,about 3000 no load .

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post #3 of 3 (permalink) Old 12-11-2009, 03:43 AM
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I have my field service data book here and with 2 valve head, and 45 injectors, the RPM seems to top out at 2200 and 103 HP. 4 valve gets you an extra 5 HP, 108. What you want to do is call Detroit Diesel with the Serial number, they can tell you what the upgrades in RPM and injectors you can go with. I can not remember whether the old engines had a different crank, If you increase the RPM you may need a dampener. As an 4-53N and 50 injectors at 2200 RPM you get 116 HP, properly equipped you can go to 2800 RPM and 136 HP. You can use the different kits "N" I do not believe you would gain that much, with the 2 valve head, putting in the "N" injectors would gain you a bit, with the "N" kits. 2200 RPM is a good RPM to run those engines last forever.

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