Steam generator, design and implementation

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Instant steam generator to power a GP system (Gillier Pantone): achievement advice

The system "GP +" is an evolution of water doped with bubbler, called GP system (in honor of his first experimenter farmer Antoine Gillet) to replace the bulky bubbler by a steam generator.

The original idea came from Michel Lathuraz, Whose nickname is Camel1. The idea and the steam generator design have been developed largely on the forums which is an example of a Peugeot 205.

It is this assembly which was directed to the Mayor of Vitry sur Orne.

To understand the interest of a steam generator, refer to the previous page: steam generator, principle and advantages

Schematic diagram

First, an exploded view of the annular GV. It is integrated into the exhaust line, after the reactor, Best centered as possible with respect to the axis of the exhaust gas.

steam generator

A freehand plan, which gives the dimensions concerning XUD7 the engine of 205. The dimensions must be adapted depending on the cylinder capacity and the type of engine (for calculation, see below).

steam generator coast


GV temperature rise is proportional to its exchange surface.
If the displacement of the engine increases, the exhaust stream also increases (for a system and a given exhaust temperature), that is to say that the flow of gas passing over the heat exchanger per unit time is larger, thus yielding more calories, and resulting in a rise curve steeper temperature. So there is a simple rule of three to do, for the dimensions.

empirical formula to calculate these dimensions depending on the cubic capacity of a diesel engine with inner tubes 16 / 18 20 mm and exterior / 22mm.

a) For a diesel engine

L = 240 / C with L the tube length in mm C engine size in liters.

Examples: for a diesel engine 1.9L will require a length of 240 / 1,9 126 = mm.

b) For a gasoline engine

L = 240 / 1,25 192 = * C / C

For a gasoline engine, it will apply a 1,25 coefficient (ie divide by 1,25) because the exhaust gases are hotter.

Examples: for a gasoline engine 1.2L will require a length of 192 / 1,2 160 = mm.

This formula will probably subsequently improved, but allows a priori to fall for the usual displacements in the right temperature values ​​and amount of the injected steam.


Here is a view pieces of brass prepared for this future GV. The inner tube is red hot at the ends, to be flared with a conical metallic object of suitable dimensions, gently struck with a mallet. This ensures that the flaring allows the tube back into the outer tube, with slight play, which will easily make a nice closing solder.

manufacturing steam generator: parts

prior verification, it adjusts:

making instant steam generator

Brazed joints, then carefully lime which protrudes into the outer tube with a big "rat tail", it remains only the solder the ends to achieve:

making instant steam generator


making instant steam generator

And GV posed in the exhaust - here on Mercedes DidierIs practiced two holes into the exhaust tube toward the mouth of 12,5mm diameter to the vapor outlet, and the other towards the bottom of SGS, 4,5 mm, to the supply tube 'water. We must "work" that little hole with an old drill (or 4 mm scrap end) by tilting it backwards (in the direction of GE) to facilitate the entry of the feeding tube.

making instant steam generator

Care should be taken before the establishment of the SGS, to achieve expansion loop of this tube to the water inlet of the GV, designed to collect the expansion of the heated copper.

After the past two tubes, and GV carefully centered in the exhaust, remains only the solder, where better to weld TIG.

Of course, for the installation, it will come up with solutions in each case, given the diversity of exhaust systems.

Here at last is a bottom view of the whole rested on the car, which gives a good idea of ​​the general arrangement of the elements. The float chamber is positioned to the GV bottom is flooded (about two cm) is missing in this picture its mounting flange, which prevents it from moving and to force the feeding tube and the tube balancing, which will connect the tank lid to steam out of GV by a hose of small diameter Indeed, following the multiplication of GV achievements and thanks to feedback generated, it appears that there are cases where the conditions of depression towards the exit of GV lead a more or less chaotic upwelling, well beyond the equilibrium level obtained at rest.

making instant steam generator

The solution is extremely simple, is to cancel the pressure difference between the float chamber and the outlet of GV. We must therefore replace the small vent hole on the top of the tank, with a start copper small diameter, connected by a small diameter hose stuck in the steam outlet hose. Thus, it has the guarantee of a stable, regardless of the engine on which the fits ...

To secure the water supply, and have precise control over the maximum flow of water per hour, just do as suggested it to me Yoan, a feed of the hose fitted with a flow meter "drip" kind of hospital infusion.

Design of a steam generator forums
A steam generator mounted in a hall
Principle and advantages of the steam generator


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