MORE QUESTIONS ,DETROIT DIESEL

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scottie:
HELLO AGAIN EVERYONE
GEE I THINK IM HOOKED ,I GOT MY FIRST COPY OF "BUS CONVERSIONS" MAG  A WEEK AGO READ IT COVER TO COVER AND NOW I FIND IM HANGING AROUND MY MAIL BOX LOOKING FOR AUGUSTS COPY ....

FEW QUESTIONS ABOUT THE DETROIT DIESEL ENGINE
8V71 OR 6V92...FROM WHAT I HAVE BEEN READING SO FAR ..8 CYL /INLINE/ 71 CUBIC INCH PER CYLINDER. AND THE OTHER ONE IS A 6 CYLINDER/INLINE/92 CUBIC INCH PER CYLINDER...IS THAT RIGHT ??
OK SO THE 8V71 IS IN THE OLDER BUSES ,IM I RIGHT TO SAY THE 6V92 HAS MORE HORSE POWER??
ANY PROBLEMS  GETTING PARTS,OR HAVEING REPAIRS DONE AT A SHOP ON THE OLDER ENGINES????
ARE THE PARTS CHEAPER FOR THE OLDER ENGINE??
IS THE NEWER ENGINES BETTER ON FUEL....WHAT SHOULD I GET IN M.P.G ON A MCI WITH A 8V71 OR A 6V92 ???
IS THERE MUCH DIFFERENCE IN POWER BETWEEN THE TWO??
OK HERES A LOADED QUESTION...AND I KNOW ABOUT CONDITION/MILES ETC ETC  BUT....
WHAT SHOULD I EXPECT TO PAY FOR A RUNNING/COMPLETE/ CLEAN/ALL SEATS IN...MID 80S MCI??
THERE ARE  4 BUSES IN THE SAME AUCTION ON E BAY RIGHT NOW MCI ,,81,85,88,87 ITS IN CANADA SO I DONT HAVE TO WORRY ABOUT BOARDERS...ITS IN DRIVEING DISTANCE...3 HOURS,I ASK THE GUY IF HE DOESNT SELL ALL 4 TOGETHER WILL HE SELL THEM SEPARATE HE SAID HE WOULD...SO ...10 GRAND?? 8 GRAND?? WHAT DO YOU THINK?
THANKS AGAIN
SCOTTIE FROM ONTARIO.. :'(

TomC:
Welcome Scottie!  As to the two different displacement series for the 2 stroke Detroit Diesels, the 71 series in buses used the 4-71, 6-71, 6V-71, 8V-71, 12V-71.  The 71 series first came out in 1938.  The 92 series used in buses is the 6V-92TA and the 8V-92TA-an in line 6-92 was never made (too bad).  The 92 series first came in 1976.  The 92 series is always turboed and aftercooled.  Most of the 71 series are not turboed, although there are a few (like me) that have turboed the 71 series with very good results.  Because of the smaller components, the 71 series tends to be more tolerant to both horsepower increases and to run them up at a higher rpm (truckers were know to turn the 8V-71's up to 2800rpm).  92 series doesn't like to be revved above 2350rpm since their valves will float.  Both series will get similar mileage when set up the same.  When the 92 series is electronically injected (DDEC-Detroit Diesel Electronic Controls) they will get about 1 mpg better than the mechanically injected engines.  The only DDEC 71 series I knew of is the 6-71TA and the 12V-71TA.  As far as I know the 6V-71 and 8V-71 never had DDEC.  Both series of 2 stroke engines are getting harder and harder to find qualified mechanics to work on them.  Plus they require using straight sae40 weight engine oil-like Chevron Delo 100, that is also getting harder to find.  Although the 2 stroke engines are extremely reliable engines, they are dirty smog wise, get less than average fuel economy and eventually all of us will have to change out to modern 4 stroke type Diesels-but hopefully not for another 10 years or so.  Good Luck, TomC

buswarrior:
Hello Scottie.

1st, turn off the caps lock, it's hard to read, and some consider it shouting.

I'm here in Toronto, if that helps.

Ok, the V in 8V71 and 6V92 means a V block engine. There are 6-71 and 6V71 engines, one an inline, the other a V block.

An MCI of the vintage you are considering will produce similiar fuel economy figures, the 6V92, all things being equal, might squeeze a shade better mileage than an 8V71.

The 6V92 has a turbocharger, the 8V71 does not.

Oh, with an auto tranny, the fuel economy will be running somewhere around 6 miles per US gallon, about 7 miles per imperial gallon on the highway, it drops hard if you start doing city driving.

As to power, an 8V71 typically was set at 270 HP, with a max of 304 HP if you spend money on injectors and advance the timing (SAE gross was 318HP)

A 6V92 might have a bunch of settings, 260 HP was popular in the mid 80's for a stock engine. There are two kinds of 6V92, one with mechanical injectors, one with electronic injectors and an engine computer. The mechanical engines may be hot rodded to stock numbers of 350 HP with the right infusion of CA$H. The electronic motors need some cheating/lying/stealing and then some to hotrod, which will cost you LARGE $$$ if you don't know the cheat/lie/steal yourself.

All depends on you, the 6V92 has a little more torque and will hill climb marginally better at higher alititudes, the 8V71 will snap off the line and out into traffic stronger.

They are all slugs compared to a car.

Pick the coach with the combination of lowest drivetrain mileage and best mechanical condition.

They all will empty your wallet and break your heart.

Just ask any of us!!!!

happy coaching!
buswarrior

Dallas:
Quote from: scottie on July 26, 2007, 04:18:34 PM

HELLO AGAIN EVERYONE
GEE I THINK IM HOOKED ,I GOT MY FIRST COPY OF "BUS CONVERSIONS" MAG  A WEEK AGO READ IT COVER TO COVER AND NOW I FIND IM HANGING AROUND MY MAIL BOX LOOKING FOR AUGUSTS COPY ....

FEW QUESTIONS ABOUT THE DETROIT DIESEL ENGINE
8V71 OR 6V92...FROM WHAT I HAVE BEEN READING SO FAR ..8 CYL /INLINE/ 71 CUBIC INCH PER CYLINDER. AND THE OTHER ONE IS A 6 CYLINDER/INLINE/92 CUBIC INCH PER CYLINDER...IS THAT RIGHT ??
Detroit diesel 2 stroke cycle engines. 8V71 = 8 cylinders, V configuration, 71 CID per cyl. dry liner, around 260-270HP in stock configuration. Some Military uses put them up to 950HP, but life expectancy suffers.
6V92 6 Cylinders, V configuration, 92CID per cyl. wet liner, around 350HP standard. 1150HP in Military use, again, longevity suffers with increase in HP.

I don't like Wet liners because of cavitation problems and other things. But your mileage may vary,

OK SO THE 8V71 IS IN THE OLDER BUSES ,IM I RIGHT TO SAY THE 6V92 HAS MORE HORSE POWER??
ANY PROBLEMS  GETTING PARTS,OR HAVEING REPAIRS DONE AT A SHOP ON THE OLDER ENGINES????
ARE THE PARTS CHEAPER FOR THE OLDER ENGINE??
Not many mechanics at even Detroit dealers still know how to work on the 2 stroke cycle engines. Parts prices depends on where you get the parts. No problem with parts availability

IS THE NEWER ENGINES BETTER ON FUEL....WHAT SHOULD I GET IN M.P.G ON A MCI WITH A 8V71 OR A 6V92 ???
IS THERE MUCH DIFFERENCE IN POWER BETWEEN THE TWO??
Depends on where you put your right foot while in gear.

OK HERES A LOADED QUESTION...AND I KNOW ABOUT CONDITION/MILES ETC ETC  BUT....
WHAT SHOULD I EXPECT TO PAY FOR A RUNNING/COMPLETE/ CLEAN/ALL SEATS IN...MID 80S MCI??
As little as possible. They were taken out of service for a reason, not because the owner just got tired of looking at them.

THERE ARE  4 BUSES IN THE SAME AUCTION ON E BAY RIGHT NOW MCI ,,81,85,88,87 ITS IN CANADA SO I DONT HAVE TO WORRY ABOUT BOARDERS...ITS IN DRIVEING DISTANCE...3 HOURS,I ASK THE GUY IF HE DOESNT SELL ALL 4 TOGETHER WILL HE SELL THEM SEPARATE HE SAID HE WOULD...SO ...10 GRAND?? 8 GRAND?? WHAT DO YOU THINK?
THANKS AGAIN
SCOTTIE FROM ONTARIO.. :'(


Please turn your Caps lock off. It's not polite to yell.

scottie:
hi
sorry about the caps..im on eye drops and it easier to see , i didnt know i was yelling
boy you guys really know your engines.
so what year did they switch to 4 strokes??
are the 4 strokes more horse power ..would be smoother  too...
how would i know a 4 stroke from a 2 stroke...just the year of the bus??
thank you all again
scottie

p.s bus warrior the 4 buses that i mention that are on ebay are in the toronto area.im off for the next few weeks and was going to check them out

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