Ford guys can't figure it out

[QRTRHRS]

Re: Two Strokes

Originally posted by KKaiser

I thrashed many a Detroit while playing Army in the '70s. 6V53s, 6V53Ts and 8V71Ts. they ran like a raped ape if the Allison was working right. If not, they were slugs. I too have fond memories of 3am alerts in Germany with the smell of diesel heavy in the air prior to leaving the motor pool. This definatly led me toward purchasing a Cummins.

Kent,



The diesel smell was good for covering up the smell of the field coffee I used to drive an 8" SP howitzer. Those 350 horses would really scream through the little 4" or so exhaust pipe. The Germans sure were happy with us driving through the little towns at 3am!

 

[KKaiser]

I need to see it!

Snowking,

I appreciate the reply, but would like a link to a graphic presentation of two stoke diesel ops. I have a hard time converting the written word to a picture in my mind.



Thanks,



KK

 

[SnoKing]

OK KK check this site:

http://www.yachtsurvey.com/comparing_diesel_types.htm

Snow King

 

[KKaiser]

Snow King,

Thanks much, that's exactly what I had in mind.



KK

 

[ScooterH]

Anyone ever lug down their 71 series detroits and have it run backwards? Smoke would start pouring out the air cleaner. Just shut her down, start her back up, and keep on truckin.

 

[fj40charles]

Those engines had good hp on NO torque!! Typical for a V8 engine.





That sounds like a description of a powerjoke or a maxipad.

Those phord boys will never figure it out...



Charles

 

[Dr.Evil]

FJ40 - Ever drive a 238 Detroit or as it was also called 6-71? 238 HP and about 3 pound ft of torque at less than 2100 RPM. The lack of torque was due to the 2-cycle design, not the angle of the cylinders. And actually the 6V-92 TTA I used to drive sometimes was rather torquey from around 1600 on up for only a 300 HP engine.

You guys with your "Real Trucks have 6-cyl. attitudes really bore me anymore. Short-sighted tunnel vision combined with lack of knowledge. The arrangement of cylinders have nothing to do with the perceived performance of the engine.

Now for something really interesting, Anyone ever have any experience with the old radial airplane engines? 28 cyl. was the most I ever heard of in one engine. 4 rows of 7 cyl. Bet it was pretty gutless huh? All those little V spaces between the cyl.

DENNY... ... ... ... ... ... .

 

[RustyJC]

OK, I'll add some fuel to the "engine configuration" fire.



One of the electrical power generation diesel/dual-fuel engines our company manufactured was a 4-cycle turbocharged and intercooled V-20 configuration with a 15. 5" bore and 22" stroke. This LSVB-20 developed 8,445 BHP @ 400 RPM. If I plug that into the BHP = (Q x RPM)/5252 equation and solve for Q (torque), I come up with 110,883 lb-ft of torque @ 400 RPM. Not exactly a "gutless" V engine... .



Rusty

 

[ScooterH]

Dr. Evil

I don't know a thing about engineering, so maybe you can explain to me in layman terms why Cat. ,Detroit and Cummins don't continue to use V8 engines in over the road trucks? I haven't seen many V configuration engines in dozers, frontend loaders, or any other equipment that needs a lot of lowend grunt, unless that equipment had some restriction in the engine bay. I was on a Trident sub. once and noticed a monsterous inline engine. (cylinders must have been 2' in diameter) Don't know what it was used for. Maybe they used the inline for dependability

The fastest, sweetest sounding engine I ever owned or drove was a V8 Mack!! But it did not pickup a load as well as my inlines.

I've owned1- 6v71, 2-8v71, 1-v8 Mack, 2-inline Cummins, 1-inline Detroit. I have driven extensively 8v92's 12v71 and Cat. inlines, and 1 inline Mack. ,also 1-90nothing (903)Cummins.

The next time I'm in southern W. Va. , or Kentucky, I'll ask some of those Coal Haulers why they don't use V8's.

 

[THubbard]

It has been some 4 years since I was in the text book; but I seem to remember that torque was a function of displacement and compression ratio with a little thing called "volumetric effeciency" thrown in and stated in ft/lbs of torque. Horsepower is a measure of torque at a given speed or PRM. The problem occures in that torque is not costant in an internal combustion engine. Street type engines tend to peak at 2200 to 2800 RPM. . The reason I remember for "V" or "Y" is to get more cylinders in a shorter space. It is generally accepted that the amount of loss due to friction goes up with more moving parts. The reason 2 strokes have more power is because they have a power stroke every revolution where as a 4 stroke has one everyother stroke. So given the same number of revolutions, the 2 stroke has the advantage. Look at two stroke motorcycles. 250 c. c. produce 30 some horspower. If you run that out straight line, the 5900 cc or 5. 9 ltr Cummings would be doing about 700 hp.