| Author |
Message |
steve (130.245.251.65)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 14, 2003 - 12:07 am: | |
Does anyone have a DD 6V53 engine? Are they good motors for a 40 footer? |
RJ Long (Rjlong) (24.127.74.29)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 14, 2003 - 12:27 am: | |
Well, Steve, here's some DDA specs for you to mull over:
6V53 = 210 hp & 440 ft/lbs torque
6V71 = 238 hp & 600 ft/lbs torque
8V71 = 318 hp & 800 ft/lbs torque
(All of the above are non-turbocharged, with C65 injectors)
6V92TA = 350 hp & 1020 ft/lbs torque
8V71TA = 370 hp & 1064 ft/lbs torque
8V92TA = 450 hp & 1230 ft/lbs torque
(The "TA" designation indicates these are turbocharged and aftercooled motors)
GVWR for a 40-foot MC-9 is 36,600 lbs. Using the magic "lbs/hp" figure, the fewer pounds per hp, the better the performance.
I'll let you do the math to answer your question. . .
HTH,
RJ
PD4106-2784
Fresno CA |
Peter Aduskevich (Slowslowpete) (63.208.84.50)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 14, 2003 - 1:38 am: | |
I just had a leak in the cooling systen to oil in a 6 53. It was a hard leak to find. Center cyl, has a square oring close to head sealing ring. An almost undetectable combustion leak ,distorted the o ring. I have and had a number of '71's series . The 6 53 was never over 180 degree's in the last 7 years. I would not repower with a 53 series. The 71 series is a better engine in my opinion. |
Geoff (Geoff) (66.238.120.85)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 14, 2003 - 8:22 am: | |
I am very familiar with 6V53's and I wouldn't have one in a bus-- they have an annoying whine to them (2800rpm governors) and tend to slobber a lot of oil. The replacement engine for them was a Detroit 8.2 or 3208 Cat. Are you looking for an engine for a school bus?-- we are talking medium duty diesels here. |
Buswarrior (Buswarrior) (64.229.210.77)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 14, 2003 - 9:38 am: | |
As the world evolved....
Transit fleets that were based in flatter parts of the country were known to spec 6V53 in their 40'. Perfectly good from the fleet manager's perspective: fuel use, parts and mechanic knowledge compatibility with the existing fleet, passenger comfort on acceleration.
When it came along, the 6V53 was a more powerful drivetrain than the ones in the buses being replaced, so everyone was happy in their ignorance.
At least the 6V53 could climb the little hill at the old Bingo with a load on. In the older buses, the standees knew they had to get out and walk the 30 yards to the stop sign at the top of the little side street, when the bus came to it. And I'm talking 1960, not 1930. Faegel was the old one that had a hard time with the hill, but to be fair, they were ancient. Transit here was still successfully paying its own way without subsidy at that time. If your passengers have been acclimatized to slow, and underpowered, who's to care? Still beats walking all the way home!
I would recommend a bigger engine, unless you are just going to be tooling around a flat town.
happy coaching!
buswarrior |
Paul (205.210.53.253)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, February 15, 2003 - 10:53 am: | |
The city where I live had Orion 35 foot buses with 6V53 detroit engines. They were geared to give some city performance but only had a top speed of about 45 MPH. Even with the transit gearing the buses were very under powered I couldn't imagine a converted 40 footer with this engine. |
Mike Eades (Mike4905) (206.148.164.184)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, February 15, 2003 - 9:26 pm: | |
RJ is that 8v71 with 65 injectors really 318? I thought that the 318 didn't show until we put 70 injectors. Mike |
RJ Long (Rjlong) (24.127.74.29)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, February 15, 2003 - 9:46 pm: | |
Mike - Yup. Spec booklet I have (dated 4/78, btw) shows:
318 hp @ 2100 rpm @ 60F w/ C/N65 injectors and 29.92 in. Hg barometer (dry)
304 hp @ 2100 rpm @ 85F w/ C/N65 injectors and 29.00 in. Hg barometer (dry)
800 ft/lbs torque @ 1600 rpm @ 85F w/ C/N65 injectors and 29.00 in. Hg barometer (dry)
(The 60F and 85F refer to ambient temp in degrees.)
Might be a little "advertising fluff", but if so, it seems the industrial stuff is less fluff than in the consumer-oriented arena. . .
HTH,
RJ |
Geoff (Geoff) (66.238.120.21)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, February 16, 2003 - 8:09 am: | |
What is "60F" and "85F"-- temperature? Anyway, my Detroit Diesel specs only show 318HP @ 2300 rpms, not 2100. 304 @ 2100 RPMs, both with N65's. N70's @ 2100 RPM should give you 319 HP.
--Geoff
'82 RTS CA |
Henry R. Bergman, Jr. (Henryofcj) (65.194.145.46)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, February 16, 2003 - 7:57 pm: | |
Detroit years ago had many different settings/ratings for the "N" engine, depending upon the application.
Some marine mills had huge injectors with higher power ratings at higher rpms. Same with some fire appparatus engines.
Plus...various ratings used different numbers. Difference between gross vs. net vs. shaft horsepower vs....
....intermediant vs contineous....etc., etc.. With N65 injectors with "A" timing, the heavy truck ratings for the 8V71N....
...were usually 318 gross hp at 2100 and 800 torque at 1400 or soosssss. Good luck. |
Geoff (Geoff) (66.238.120.48)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, February 16, 2003 - 9:47 pm: | |
"318" is what all the truckers call an 8V71, no matter what the actual horsepower is. |
RJ Long (Rjlong) (24.127.74.29)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, February 16, 2003 - 10:50 pm: | |
Geoff -
The numbers I posted were from a spec folder dated 4/78, my guess is that your data sheets are probably newer and more accurate. The 60F and 85F were temperature references - haven't figured out how to get that little "degree" circle for temps to post properly via the 'net.
BTW, in that same 4/78 spec sheet, it lists the 8V71TA using a "7G75" injector. Any idea what the difference is between that and an "N" or "C" injector?
RJ |
Geoff (Geoff) (66.238.120.6)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, February 17, 2003 - 8:06 am: | |
Yes-- the internal timing of the 7G injector is different than the N or C series, so they are not interchangable.
--Geoff
'82 RTS CA |
Scott Whitney (66.82.9.24)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, February 17, 2003 - 2:00 pm: | |
To type the degree symbol (i.e 70°) Hold down the 'Alt' key and hit the keys 0 1 7 6. In other words, Alt plus zero, one, seven, six and upon releasing the six key, the ° symbol will appear.
Scott |