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03 /29/ 24, 8:22amLogin ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 123456[7]8910 ]
Subject: Re: PT36 V.S. PT40


Author:
Bob Dilks
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Date Posted: 10/ 9/ 02, 6:27pm
In reply to: Bill Fox 's message, "PT36 V.S. PT40" on 07/ 14/ 02, 9:36pm

Our 84 PT36 has decent power. The 330 HP 6V92 engine puts out 970 lb ft of torque. At 37,800 pounds loaded weight that is 115 pounds of coach for each one horsepower and 39 pounds of coach for each foot pound of torque. Our coach will cruise at 70 MPH and has a goverened top speed of 75 MPH at 2250 RPMS. The PT36 seems easier to handle than the longer units. As I recall, the 475 HP 8V92 puts out 1250 lb ft of torque in a coach with a loaded weight of about 42,000 pounds which equates to one horsepower for each 88 pounds of weight and one foot pound of torque for each 34 pounds of weight. The coaches have the same top end goverened speed limits but the 8V's are turning about 1950 RPM's. The expected performance difference is ameliorated in the 6V92 which has a has a five speed transmission while the 8V92 has a four speed. Why not get a PT38 which has the 8V92 and four speed transmission with less weight. You can also change the fuel injectors from 90's to 100's and boost your horsepower to 500. A friend of mine who has a PT38 with a 500 HP 8V92 says it "eats mountains".

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Replies:
[> Subject: Re: PT36 V.S. PT40


Author:
Jeff Miller
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Date Posted: 10/ 10/ 02, 5:16pm

You could also add N95 injectors to the 6V92TA and bump it to around 375hp, or N100s and a new turbo nozzle. You can get 400hp out of the 6V92TA, although DD only produced 400hp 6V92TAs that were DDEC controlled if I remember correctly. You'd also have to increase radiator size and check the max. rating on the transmission.
A PT38 with an 8V would be okay, but notice that the longer engine was accommodated by using more bedroom space, and it wasn't added until '85 when the rear overhang was increased to create enough engine room length.
The 8V92 is heavier, longer, and until '90 it had only a 4-speed transmission which negated some of the additional power as the 92-series engines have a very narrow power band and fall flat on their faces if you don't have a gear for the climb/speed you're on. I like the 5-speed 6V just fine, the extra power of the 8V is nice but still not fast and it comes at a cost (space/weight/fuel mileage/price).

- Jeff

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[> [> Subject: Re: PT36 V.S. PT40


Author:
Jeff Miller
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Date Posted: 10/ 10/ 02, 5:19pm

Oops, forgot to mention. The biggest advantage that I see in the PT40 is the large pass-through basement behind the steer axle, the PT36 doesn't have it.

- Jeff

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