6V71 Detroit Diesel Cold Start

[123MrBurg]

I miss the 2 strokes, I ran a 6V92 for 2 years, it would turn 2400 rpm and sounded do cool when it was wound up. All 335 hp. :-)

These motors were dragonflies but I still loved them. Thanks for the video.

[6122gerald]

I went to a diesel tech school along time ago.The shop had a 6-71 fire up and it

had a run away situation and could not be stut down.A flat board was supose to be

put on the air intake,but too late.A studant lifted his shurt and put his chest on

the intake side of the blower and instant large hickie and belly rupture.Not to smart.

[electricshockproof]

@amusichound Nor the correct valve covers. It's a 71 here.

[Busdude97]

What kind of bus is that?

[julescicle]

sounds great you cant beat the leaky beast of a detroit

[retcan]

love the sound with the turbo in the background.

[countryboy732]

this aint a cold start! It's only 45! I pray for mornings like that!

[anewbeggining21]

Where is Blacksburg?

[rednecktruck19]

what does something like that go for?

[DagonTracnos]

Sweet running 6-71! No idle roll and she kicked right over. No block heater used I assume? I expected a lot more blue smoke and roll....

[sirloyal]

Blacksburg Transit Authority ordered all of their transit buses with 6V71's. I know it because I saw the whole fleet for sale in person.

[dredre1315]

MBTA had the 6V71T (turbo charged) gmc rts buses that were from 1985

[studpuppy69]

Its a 6v71, listen to it.

[detroitmansilver92]

that's a 692 not a serie 71 but heck it's in good shape to start and run as smooth as she did on the first go.

[sirloyal]

Good gravy, you'd think I would know what it is, since I bought it from the original transit authority that ran it and got it with all receipts, manuals, parts catalogs, maitenence logs- hundreds of pages- along with an additional new rebuilt engine to drop into it (still in it's shrink wrap). But then, I guess you saw a 55 second video, so what do I know?

[detroitmansilver92]

whatever you say

[valleyfever]

It's a 6V92TA, you're correct. =]

[poppiesrule]

@sirloyal I guess you would also know that 2 stroke detroits are not classified as "blown" since they can not run without a blower, and the blower is used for scavenging, not increasing the air charge for combustion. Show me a 6V71 without a blower? What DO you know?

[dieselman1988]

@sirloyal wow a whole new motor ready to drop in. that is a good deal

[AntoDamicoShow]

@detroitmansilver92 You crazy, listen to that high rev idle it's a 71

[ClassicTVMan81]

The Greater Lafayette Public Transportation Authority (now CityBus) of Lafayette, IN, was another transit agency which specified the 6V-71TA in their Flxible Metro buses. In their case, though, the buses were 35' long.

[flyingscrapyard]

Now that's quality. Any wonder these things were used on standby generators where they might sit for months and months then expect to start unfailingly every time and immediately run up to peak working revs with no warm-up. Go you good thing.

[BernardR30]

These engines were built to last!! If the government wouldn't have made strict emmission laws, Detroit will still make a ton of these engines!!

[moncai1]

Buses in Ireland used this engine into the early 2000's. They were mated to Allison V730-3 speed transmissions.

[team486]

6v92 not 71series.

[theangrytruckdriver]

I used to work for the LACMTA that had flx metros the 2800' series with a detroit inline 6-71 ddec turbo built around early 90's

[fuddmethen]

hmmm...MBTA (Massachusetts Bay Transit Authority) ran ALL detroit motors (6v71's) for the longest time, probably up to about 6yrs ago, and sometimes you still here the ole' Detroits roarin' under the hoods

[ClassicTVMan81]

They only went to the 6V-92TA when they bought RTS's, when GMC sold out to TMC/MCI in 1987.

[figzig]

is this an air start?

[Dirtbikeracer250]

thats not a bad injector its just a fuel knock because its cold

[markthebusman]

Definite misfire at the start of firing up, then it settles down, possibly an injector on the way out / timing problem? Running a bit fast as well by the sounds of it. This motor would run extra sweet if everything was fixed on it.

[chrisfdny1]

These motor are a TWO stroke design,,,,,,,the all start like that when there are cold.....and GOD KNOW HOW MANY MILES ARE ON IT.....BUS ENGINES

[jaggass]

the engine looks nice

[roadwolf2]

detroits are a 2 stroke motor and need the blower to scavange the air so they are always blown but are classed as "naturally aspirated" if they dont have a turbo

[flyingscrapyard]

Correct. The blower does not pressurize the in coming air like a compressor, just delivers air like a fan. Hence in this application, it is not a supercharger. Interestingly, the Rootes blower was used for ventilating underground mines before engines came along.

[breitkreuz1]

A guy can change the gears on the blower drive to speed it up then it does create boost pressure!

[jaggass]

no problem for a detroit engine

[s172mch]

where did ya get it?

[jacuzzibusguy]

I have a 6v71 and it is turbocharged. Technically it is a 6v71T....T for turbo. Mine is in a 1987 city bus

[dhmarley]

Is that a turbocharger I see on top of the engine? If so that's the first 6V-71 I've ever seen with one.

[huppypuppy]

The Detroit 2 strokes came out as either N (natural aspiration), T (Turbocharged non-aftercooled), TA (Turbocharged & Aftercooled) and TTA (Twin Turbocharged & Aftercooled) - so if it's the first one you've seen, where have ya been all this time???

[Kokoots]

On a Cummins "N" stood for 4 valve head. 4 valves per cylinder. Two stroke Diesels will not work unless they have an engine driven supercharger. So it's unlikely you could have a naturally aspirated Detroit 2 stroke Diesel.

(Just read roadwolf2 comment)

Two strokes never really caught on in the U.K. Foden and Commer had their own versions in the 50's and 60's and Bedford used Detroit's in the 70's, but they were never popular.

[huppypuppy]

The engine driven supercharger you're referring to is actually a Rootes style scavenging blower which is used for scavenging exhaust gases out of the engine and introoducing clean filtered air into the engine for the new cycle! Roadwolf2 is right in saying that! As far as I know (and I know a little bit about them), they weren't the only two stroke diesel in existance... Krupps of Germany had one as did Chrysler UD - as you say Foden and Commer had them as well!

[ilovebabyfeeders]

i have one

[ClassicTVFan82]

Is this an ex-Blacksburg Transit Flx?