As it turns out, not at all! On the
contrary, an AB Engine can have significantly higher engine power
output compared to traditional Otto designs with the same engine
volume. Believe it or not, it can even be as high as a Miller engine
and without a complicated Miller turbocharger design!

If you look at the AB Engine cycle P-V
diagram, you will notice that after point V2, when the AB Engine
intake valve is closed, the

minimum pressure in the chamber can be
much below that of the initial gas intake pressure. In conventional
engines, except Miller, it is impossible to fill chamber with gas at
initial pressure. Resistance of all manifold components including
filters does not allow it. Typically, the higher the RPM, the lower
the gas amount coming into the chamber causing lower power output
from each cycle. Because of this, a conventional engine is limited
in increasing engine power output with increasing RPM! Pay
attention, the AB Engine does not have this problem. AB engine can
achieve very high levels of RPM with the same cycle power output,
increasing Engine Power Output linearly with increasing RPM. Why?
Because the AB Engine patent covers the algorithm to change V2 valve
closing position depending on the fuel type as well as changing
conditions of gas flow with increasing RPM!

Remember the P-V diagram? Compared to
a conventional engine, we have a huge reserve of pressure difference
to make gas flow as fast as this difference. With twice the
difference in compression and expansion minimum pressures, after V2,
only o.25 from the initial gas pressure!

The calculation is simple. Let’s
assume that a conventional and AB Engine have the same volume and
similar resistance manifold design. It is easy to estimate the
engine power output calculating the amount of gas that can be
delivered through the manifold track. The more gas going through the
manifold, the more power you can create from the increased fuel
amounts and you can burn with larger amounts of gas. Similar
manifold design can deliver the same maximum amount of gas
regardless of the PRM. So we can assume that an AB Engine and a
conventional engine can go through the same amount of gas and burn
the same amount of fuel! But the AB Engine has a higher fuel efficiency
(up to 45%) and correspondingly higher possible power output, up to
45%, just because of the fuel efficiency. There are also other reasons
why an AB Engine will have more powerful output. Conventional
engines susch as Otto, Diesel and Atkinson engine taking smaller and
smaller amount of gas with increasing RPM make each working cycle
less and less optimum! Burning fuel with smaller compression
pressure, becoming less and less efficient and as a consequence,
conventional engines lose power very quickly with RPM!

On the contrary, during maximum power
output, the AB Engine always keeps the actual compression ratio the
same with changing RPM by definition of invention! At higher RPM,AB
Engine intake valve closes later and later, keeping the amount of
gas the same per cycle and optimal for gas burning. Testing my
personal car with a modified engine from 8 to 16 compression ratio,
I surprisingly found that the car became not only more than twice as
efficient, but also became significantly more powerful, gaining
power noticeably up to the maximum of 5000 RPM that were limited by
engine design.