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Old 02-02-2007, 11:07 PM   #11
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Old 02-06-2007, 01:35 AM   #12
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The point of the thread isnt to debate which motor is better he is just wondering what the story of the 1693 is, not to say that its better than a cummins. The four and a quarter cat, is that a 1693 or a 3406? I always hear how good they were but was just wondering which model people are refering to.
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Old 02-06-2007, 03:10 AM   #13
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Really didn't have anything to do with Cummins. I wasn't familiar with this CAT and couldn't find much on the net about it. It sounds like a good motor, a bit ahead of it's time but not direct injection. Sort of like the KT cummins in some ways in how it served the trucking industry. I have heard elsewhere that they are pretty durable and easy on bearings.
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Old 02-06-2007, 03:18 AM   #14
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Quote:
Originally Posted by Chris88
The point of the thread isnt to debate which motor is better he is just wondering what the story of the 1693 is, not to say that its better than a cummins. The four and a quarter cat, is that a 1693 or a 3406? I always hear how good they were but was just wondering which model people are refering to.

Most people are probably refering to the 3406, atleast when most of the guys i am around are talking Four and a quarter they are talking 3406
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Old 02-06-2007, 04:20 AM   #15
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I would say that when most people are talking about 425 Cats they are refering to the 3406B air to air motor from the mid 80's and newer, and like you said information is hard to find on the 1693 mostly due to the fact that there arent many left running. Also the last production year that the motor was offered was 1976, again another reason it is hard to find info.
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Old 05-05-2007, 02:59 AM   #16
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What can you do to upgrade one from 325hp?
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Old 05-05-2007, 04:29 AM   #17
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they were cats first leap into the OTR truck market. IT was a bit before my time. I have ridden in a truck powered by a 1693 and it pulled strong. but when he fired it up and it settled down to an idle I waited a couple of seconds before going near it. I thought it was going to rattle apart!

like said previously, when the get quiet that's when you have to worry! now a day they pretty much live along side the 3408's in the fact that if there running they should be kept running because there a unique part of the history of the modern Semi truck and diesel power in general.

but there fuel sucking pigs and parts are rare and spendy! They Smoke pretty good and can be turned up to really lay power to the ground. but they can, do, and will break when pushed to there limits.

If i had the space to keep one inside and the $$$ to restore them and treat them right i would definitely have one as a toy. would i run one down the highway ever day to make a living, Definitely not. Just to many better options out there that are cheaper to maintain, easier/cheaper to repair, and get WAY better mileage. And in OTR trucking MPG = $$$
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Old 05-06-2007, 07:12 PM   #18
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Quote:
Originally Posted by kblackav8or
What can you do to upgrade one from 325hp?
The main difference between the 325 and 425 was the air-charge cooler, the 425 had one the 325 didnt. A 325 can be made to run with a stock 425 on fuel alone, not sure how they do it but it takes somebody that has been around one before to know exactly what screws to turn.
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Old 05-07-2007, 02:42 AM   #19
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They really are sort of exotic. Got a look at one in person today. DOHC, 4 valves per, turbocharged, 14.7 liter or 893 CID. They are big and unique sounding. I am not against Cummins in any way but these are pretty cool. It is too bad they are somewhat fragile if you abuse them.
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Old 05-07-2007, 03:38 AM   #20
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The 1693 was kind of a prelude to the 3406. They had some good ideas just needed time to refine them. I know the dealer here had to pull a few of them out and change them for Cummins to keep the big customers happy. The early 70’s model 359 Peterbilts had inboard steering boxes so that was a project if I remember right.
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