Water injection

[user-23911]

By changing the partial pressures of the gasses in the exhaust.

But you need to understand how these things work.....first.



Then do lots and lots of testing.

[nitro2]

Although it was long believed to be, the ideal Location of Peak Pressure of combustion, especially at part throttle, is not universally fixed at 14°. A number of years ago, a GM researcher developed a pressure feedback system utilizing a sensor-equipped head bolt, for the purpose of dynamic spark advance control to maintain LPP at 14° ATDC. As the work continued, corrections had to be introduced for various applications and operating conditions. Eventually it was realized that the resulting tables were pretty much as complicated and time-consuming to create as a normal spark table, and the project was dropped.

Right. The idea that there is an ideal location for peak pressure is pure fantasy. Not sure why anyone ever thought that in the first place, maybe because proper processing was not feasible back in the day.

Peak pressure location is nothing more than 1 single point (i.e. 1 degree) in a combustion pressure process that spans a great many degrees of crank rotation. The ideal location for the entire combustion process (for racing and most (but not all) other purposes) is the one that makes maximum IMEP, which is determined from the summation of the pressure for ALL of the degrees of rotation of the crank.

Fortunately the software to take all of the actual real pressure data and determine if the combustion process is too soon or too late, and by how much, for every condition of load and rpm, exists and has existed for at least a decade.

[3pedals]

By changing the partial pressures of the gasses in the exhaust.

But you need to understand how these things work.....first.



Then do lots and lots of testing.

Care to elaborate?

[MadBill]

Update: I just remembered, the initial magic number was 17°. This would have been ~20 years before the Cline article was written.

[chimpvalet]

Any advice on how best to deliver water with an IR carb'd N/A engine?

[user-23911]

Get rid of the carb fora start.

[Jeff Lee]

Maybe this is related...maybe not.
Remember Andy Granatelli’s Tune Up Masters? I worked there in the late’70’s as a “Tune Up Tech” and after replacing parts, we would but the vehicle on a chassis dyno, load the dyno for WOT at 55 MPH indicated on the speedometer. Then (air filter housing off) we would squirt straight water into the carb. This was back when vehicle emissions was a new thing (at least here in Arizona) and some of the vehicles came in with 100,000 miles on the odometer and original plugs and points! And owners though the vehicle ran good! The water treatment blew out the carbon build up and the vehicle was noticeably more responsive when done. Next we would time the engine again at WOT / 55 MPH full dyno load for peak RPM. That’s what got Andy in trouble as we were altering the OEM timing specs which made the EPA unhappy. But man, most cars left running way better than they came in!

[user-23911]

Reminds me of modern day ricers doing a "seafoam" tune up.
What's in seafoam besides water?

[3pedals]

Reminds me of modern day ricers doing a "seafoam" tune up.
What's in seafoam besides water?

Are you engaging in the "Science of dis-information"?
Lol

[Truckedup]

Reminds me of modern day ricers doing a "seafoam" tune up.
What's in seafoam besides water?

Yeah Seafoam... The dry intake manifolds interiors on port injection engines get a bit dirty and greasy after a few years.. They look down the throttle body and see the dirty stain. So they rev the engine and pour in the Seafoam...Big cloud of smoke then the dirt is gone...Where did the dirt go?