It really does work because of the fact that exhaust gasses don’t need an exhaust stroke to leave the cylinder.They also rush out of it with enough energy to pull in a new charge behind them and drive a turbocharger.The pistons do the same job as 4 stroke inlet valves do.
Oooo.Kaay…
Since the gases are “rushing out” (without being expelled by a rising piston in a 4T) why is that? It is because they are at higher than atmospheric pressure.
Why then do they not exit through the inlet as well as the exhaust side? It is because the inlet is at above atmospheric pressure.
The inlet pressure must be above the exhaust pressure or else the gases would exit through the inlet. The gases cannot “read” any sign post saying “This Way Out Only”.
Gases exiting do not “pull in a new charge behind them” as a descending piston does in a 4T. In that scenario an expanding volume creates a low pressure area, not the high pressure area you have described, (the high pressure that gives the gas the energy to “rush out” and to drive a turbine) and I agree exists in the 2T.
Your shoddy research and the inability to recognise untrustworthy sites. Did you even look at the official RoadRanger site?
Your rude, arrogant and condecending attitude.
Your desperate need to always the keeper of all knowledge and inability to accept that there are others with more knowledge than you.
Your arrogant assumption that you are always right, even when it’s patently obvious that you are wrong. You would argue fiercely, including quotes, links and YouTube videos that the sun rises in the west, in the southern hemisphere.
Your hyperbole concerning qualifications and the strong intimation, bordering on prevarication, of your experience.
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^^^ end of chat. 
If you and Mr. Fuller really want to get technical about this zb you could start with where this confusion begins.By definition if it’s a range change box then the so called ‘deep reduction’ is actually the low range of three ranges.
Deep reduction could mean anything splitter or range change.
It’s low,mid and high range.Or the range change description means the square root of zb all.
Looks like you’ve gone back to Mr Angry mode.
No I didn’t see any ‘official’ Eaton/Fuller information describing the 15 speed as a ‘‘range change box’’ or I obviously wouldn’t have bleedin argued the case.Together with all the other obvious confusion even by credible sources contrary to your indignant rant.
A range change design, covering that many ratios, is/ would be virtually unprecedented.
So not difficult to make an unambiguous description of which they didn’t to my knowledge unless you can show otherwise.
Although contrary to your obvious wishes I’m not going to take the Japanese apology method over it.Now that I realise which design it actually is no thanks to Fuller’s information.Although you will find ‘official’ Fuller information which says don’t float gears double de clutch shifts.
When you hear all that noise from a straight through unbaffled exhaust from a 4 stroke petrol do you think it’s the result of the piston pushing out the exhaust gasses on the exhaust stroke ?.
Or is it what is effectively the explosive release of the over pressure in the cylinder created by the expanded exhaust gasses starting before BDC on the power stroke and effectively well on their way out of the cylinder creating a virtual less than atmospheric pressure in the cylinder behind them, well before TDC on the exhaust stroke ?.
Similar applies in the case of a two stroke Detroit.Except the exhaust valves open even sooner before BDC on the power stroke.
They don’t close until after BDC in overlap with the then open inlet port to maximise the scavenging effect.
Magic indeed especially when it’s turbocharged.
The exhaust gases can’t exit out of the inlet side because of the closed inlet valves stopping them.Just like the closed inlet ports in the case of a two stroke.Although similar to a two stroke valve timing overlap is still used to harness scavenging effect of the exiitting exhaust gasses.IE inlet valves open before TDC on the exhaust stroke.
Not at all, it is a 10 speed, as in RT or RTO ***10 with an added 5 speed deep reduction gears, giving 10 ratios for normal use and an added 5 deep reduction for extraordinary use. In normal use only the top ratios are used, reflected in earlier use of a dash mounted control.
There are no inlet valves in a Detroit 2T.
It is, as you mentioned previously, a piston-ported design.
In any case the “valves” are open or closed. Do not confuse them with “one-way” valves.
If any (imaginary) inlet valves were to remain closed, how would the new charge enter?
Even your imaginary valves do not solve any issues with gas flow.
Gas flows from higher to lower pressure areas.
Whether it is a passageway controlled by valves or by piston position, gas flows are due to pressure difference.
You have already said that the gases in the cylinder are “rushing out”, which is because they are at above atmospheric pressure.
In the same paragraph you envisage having the imaginary inlet valves closed and there being an overlap when they are open.
Schrodinger’s cat would be proud of you.
I’m not angry, I’ve got nothing to be angry about. I haven’t made a fool of myself, trying to look cleverer than I am. Looks like that humble pie has given you indigestion.
You need to improve your research skills. Not everything on the internet is true.
I’m not surprised you would think such, with your short and limited transport industry career. There is no call for complex or sophisticated equipment pottering about in a council truck or the undemanding, mundane task of delivering parcel freight from depot to depot.
There were many heavy duty trucks with 5x3 or 5x4 gearboxes of various brands, the most recognizable being the famous Mack quad box 5x4. Ask Spardo about single handed compound shifts. You wouldn’t know where to start.
Now you’re gone from the sublime to the downright rediculous, a little indigestion is perfectly adequate.
I have not changed my stance. You have some book knowledge that could form parts of interesting conversation, but your behaviour has made you universally disliked and rarely taken seriously. Stop trying to project the appearance of the highly and widely experienced driver, blokes who have genuine experience can smell bs, a mile off.
Be who you really are, a bloke who knows a bit and has an interes in trucks.
It’s a 15 speed ‘‘range change’’ box agreed ?.
You then say that the lowest ‘‘range’’ of 5, of the 15 gears, isn’t the low ‘‘range’’ and the, by definition, mid ‘‘range’’ of 5 gears isn’t the mid ‘‘range’’ and the highest ‘‘range’’ of 5 isn’t the ‘‘high’’ range’‘.
It’s a 10 speed range change with a deep reduction set of 5 which I’m expected to guess is a deep reduction range, or bleedin deep reduction splitter.With many who even drive the thing getting that call wrong let alone me who’s never even seen one.
The fact is if it’s a 15 speed range change box, which it undoubtedly and unarguably is, then it’s also by definition low range, mid range and high range and it’s titled the Fuller 15 speed range change box.
Now about that mobility scooter and trailer.Obviously the clear definition, of the advantages of drawbar train weight and load capacity, v an artic.
While I’m happy to accept Franglais’ idea that a Detroit two stroke has permanently open inlet ports.Which runs on the principle of the blower pushing higher than atmospheric pressure air in and blowing the even higher pressure exhaust gasses out of the exhaust despite the turbocharger messing up the whole design.
Just to keep the bleedin peace.
Some things never change.
Think ‘transfer box’. You’re still trying to think of the standard 10-sp Fuller range-change manifested as a 15-sp Fuller as a 5-over-5 as another bolt-on five. The deep five is like a transfer box on a Landrover-type vehicle.
To add if you think there is no inlet ‘valves’ in the Detroit two stroke process how does the piston create compression and combustion create expansion power in the cylinder without blowing it all out of the inlet ports .
There are inlet valves on the Detroit two stroke in the form of the pistons which cover and open the inlet ports in the bores at the correct point around BDC of the power stroke.The exhaust valves open before that point.
Like a 4 stroke the exhaust gasses left in the bore are already leaving the cylinder at enormous speed well before TDC on the exhaust ( compression in this case ) stroke leaving behind a less than atmospheric pressure environment behind them which the inlet charge then fills during the inlet v exhaust overlap period.
Or none of that is correct the inlet ports are permanently open, totally reliant on forced induction from the blower , to blow out the exhaust gasses through the exhaust valves and at the same time to fill the cylinder with the new charge.
In which case define scavenging, naturally aspirated or turbocharged ?.
How? What is it with your truck and dog fetish?
I get the drawbar truck fetish but dog 
The Land Rover transmission could logically be described as a twin stick 4 over 4 8 speed range change box.
Don’t think there’s any prerequisite that each different range has to provide a continuous progression of gear steps relative to the other, as in either case.
The definition would be each different ‘‘range of gears’’ is selected by the same gearshift control regardless of the range control and selection method and relative progression of the gear ratios.The 4 speed gear shift in the case of the Land Rover or the 5 speed shift in the case of the Fuller 15 speed selects the gears, regardless of which range of gears is actually selected by the respective range change controls.
Because, like dispensing with the unnecessary induction and exhaust strokes of a 4 stroke diesel, coupling up a trailer, without it imposing any of that load on the lead vehicle, is good engineering practice.
Whether it’s a mobility scooter or a two, or three, or four axle rigid or even the lead trailer of a road train.
Which will become even more apparent if they are serious about EV trucks, assuming they don’t want battery capacity at the expense of payload and vice versa.
It was actually you who posted the proof in this case assuming it’s an EV mobility scooter ( most probably ).