It is all the more true that without carrying out real tests on performance, pollution and consumption it is very difficult to tout this technology without the support of concrete data and reliable data on the reliability (precisely) of the converted engines .
Indeed, for amateurs, the somewhat square tests with instrumentation and measures that hold water, it is more of a dream than a reality ...
When the gain in consumption is relatively low (about 10% on my R19), but that the final uncertainty of measurement is between 5 and 10% ..... the ground is slippery .... After, those who proclaim miraculous gains (50%) on engines supposed to operate normally at the start ..... engage only them .... or those who want to believe them.
For reliability, when it is ready (a Gillier Pantone), the high engine is cleaned / stays clean, it is certainly a plus. André spoke of (40000 km?) Carried out in Gillier Pantone without incidents.
On the other hand, during the development and certain "hazardous" modifications, one can easily make co ... ries and make swallow a mouthful of water with the high engine. A little coughs a lot, and it's good. A larger one or repeatedly, we can blow everything (turbo, cylinder head, piston, crankshaft, valves ....). In short, not an adventure for the first comer who wants everything, right away.