Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Nickel Plating piston tops etc: more timing advance

Logic · 09-25-2023, 11:07 AM

"...Use of In-Cylinder Catalysts
In order to investigate the application of the concept of
catalytic combustion, various catalysts, such as copper,
chromium, and nickel, were coated on the combustion chamber wall or determining their effects on engine
pcrtormance. combustion, and emissions characteristics...

...Among the
different catalysts investigated, copper was found very
effective in reducing both HC and CO emissions, and brake
thermal efficiency was also improved. At a high CR of 9:1
and with a lean mixture (A/F=15.7), copper catalyst increases
the absolute brake thermal efficiency from 17.7% to 22.8%,
decreases HC emissions from 3200 to 2300 ppm, and lowers
CO emissions from 3.6 to 0.25% by volume when compared
to the normal engine (CR=7.4, A/F=13.2) at 2 kW, 3000
rpm. Ignition delay was lower, combustion duration was
shorter, and cylinder peak pressures were higher with the
copper catalyst at higher compression ratios and with leaner
fuel-air mixtures. Knock-limited power output also increased
by about 12% at a high CR of 9:1 in the presence of copper
catalyst..."
https://digital.library.unt.edu/ark:...dc740511/m1/8/

There's interesting stuff in the rest of that paper too.

Now coating pistons, valves, intake tracts with copper is as easy as a Copper Sulphate solution and some copper wire.
(I played with this as a kid)

Nice too see some vindication of the idea..?

09-25-2023, 11:07 AM	#15 (permalink)
Logic Master EcoModder Join Date: Aug 2022 Location: South Africa Posts: 518 Thanks: 172 Thanked 218 Times in 183 Posts	"...Use of In-Cylinder Catalysts In order to investigate the application of the concept of catalytic combustion, various catalysts, such as copper, chromium, and nickel, were coated on the combustion chamber wall or determining their effects on engine pcrtormance. combustion, and emissions characteristics... ...Among the different catalysts investigated, copper was found very effective in reducing both HC and CO emissions, and brake thermal efficiency was also improved. At a high CR of 9:1 and with a lean mixture (A/F=15.7), copper catalyst increases the absolute brake thermal efficiency from 17.7% to 22.8%, decreases HC emissions from 3200 to 2300 ppm, and lowers CO emissions from 3.6 to 0.25% by volume when compared to the normal engine (CR=7.4, A/F=13.2) at 2 kW, 3000 rpm. Ignition delay was lower, combustion duration was shorter, and cylinder peak pressures were higher with the copper catalyst at higher compression ratios and with leaner fuel-air mixtures. Knock-limited power output also increased by about 12% at a high CR of 9:1 in the presence of copper catalyst..." https://digital.library.unt.edu/ark:...dc740511/m1/8/ There's interesting stuff in the rest of that paper too. Now coating pistons, valves, intake tracts with copper is as easy as a Copper Sulphate solution and some copper wire. (I played with this as a kid) Nice too see some vindication of the idea..?