Tell us what that is ?.Then tell us what the N suffix denotes on two stroke Detroits ?.
To add itâs actually a belt driven blower not a belt or gear driven supercharger.
A Detroit two stroke ainât supercharged itâs either naturally aspirated ( N ) or itâs turbocharged ( T ) there is no ( S ).
Obviously itâs you that needs the lesson in the difference between a blower v a supercharger.
Itâs not a supercharger.itâs just a blower to aid scavenging/induction on start up.Non turbo models are designated N for ânaturally aspiratedâ all have the blower.It wonât start without the blower.
Blimey Franglais where do you get the idea that two stroke Detroits werenât turbocharged.
The blower is mainly just to help to fill and to clear the cylinders during start up itâs fitted and applies to turbocharged and non turbo versions.Turbo Detroit numbers have the suffix T added to the usual designation of number of cylinders, configuration and cylinder cubic capacity.
Ta means aftercooled (intercooled).
Weâre going to need a different prime mover for that trailer.
It wonât run without âa blowerâ of some type, at any speed.
Detroit calling their supercharged engines NA is a bit confusing in my view. Because an engine will not run without a supercharger is no reason to pretend there is not one there!
I readily admit that I am indeed surprised that turbos are run on 2T engines.
Well googled Carryfast, but that has always been your strong point, in trying to appear knowledgeable.
Have you ever seen or driven a Detroit two banger?
@Frangers Whatâs 2T that you have used a few times? TTA?
2T is an abbreviation for two stroke and 4T is four stroke.
Why T? I dunno.
Specialist two stroke oils, for motorcycle type and garden type engines are often labelled as 2T, too.
Thanks mate, not a term used here. Reading as two stroke made sense, but I couldnât come to terms with 2T over 2S.
Letâs not forget the Commer knocker, also a two stroke that used a scavenger pump, which was developed by them. Hence the name, Rootes blower.
Well, what is the difference between a blower and a supercharger?
Both pressurise the air to push it into the cylinder. What is the differentiation?
As I was typing my previous reply, I was thinking Detroits were available before TS 3s, so googled Rootes blower,
" The Roots-type blower is named after American inventors and brothers Philander and Francis Marion Roots"
note the different spelling.
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Why donât you just admit you got it wrong.
Itâs called N because itâs not Supercharged.Itâs called T because itâs turbocharged.
The energy contained in the expanded exhaust gases leaving the cylinder is not only sufficient to provide scavenging which is how naturally aspirated two strokes work, itâs also sufficient to run a turbocharger which really does pressurise the inlet charge above atmosphere.You were simply way underestimating the amount of energy contained in the exhaust gases.
I actually started my career in the job surrounded by mostly Detroit two stroke powered vehicles from 6v71N to 16v71N to 6v92T and 8v92T before Google ever existed.
Itâs a blower not a supercharger turbocharging is a ( worthwhile ) option.Franglais got it wrong not me.
They are called NA because âthe blowerâ doesnât pressurise the induction above atmospheric.So you agree itâs not a supercharger ?.
Would that be the career where you failed to finish the training?
It is a supercharger and used as such by hotrodders.
Itâs referred to as a blower in Detroit parlance, same horse, different jocky.
It has been noted that you avoided the question, asking if you had ever driven a Detroit.
Did Bedfords fit Detroits in some of their TMs?
Iâm thinking I once had one in a hire motor for a week or so.
It was a lively thing, but it may have been a Cummins, who knowsâŚwho cares? 
@robroy yes Bedford KM, same cab as TK and with a big, high bumper, had Detriots as an option to their own 466.
In the case of the Detroit itâs called a blower because it just âblowsâ air at atmospheric pressure into the inlet side of the engine to aid scavenging.Which is also why itâs called âNâ for Naturally Aspiratedâ in Detroit âparlanceâ.
A supercharger âcompressesâ the inlet charge air above atmospheric pressure.
Which is why Detroit went to all the trouble of fitting it with a turbocharger or two and preferably charge cooling.To âpressuriseâ the inlet charge which the blower certainly doesnât.I didnât âfailâ in my career in that regard I was moved at my own request from factory to works transport and test driving.
Knowing the difference between a two stroke diesel blower v a 4 stroke petrol supercharger compressor was expected of me in that.
You failed to complete your apprenticeship, that in your alternative world makes you an engineer. 
You seriously expect us to believe you went from failed apprentice to test driver?
Pull the other one, it plays jingle bells.