Living Throttleless

[Frank Lee]

Various OEMs (cars and motorcycles) have been diddling around with this idea for decades. They found, as you are finding, that the process needs to be HIGHLY regulated within very narrow parameters to work without blowing things up. Thus they don't feel it's ready to be in the hands of the ham-handed public.

[theunchosen]

Pistons have not arrived. Have not been shipped even. Manufacturing delays.

In reverse order this time ^^,

Frank yeah. We as a populace are not ready for something so high maintenance.

Merc, I've looked at it but I am partially considering a new option.

Update.

With the throttle plate back in place I should be able to get it to any cruising speed and then gradually lean it out to the limit of ignition. This is quite a bit higher than what alot of people are suggesting. If you watch an engine as it runs out of fuel and its got a wideband sensor it will show you the AFR goes well and above 20:1. As your lines reach the point its injecting mostly atomized gas(running on fumes) it will run for a few seconds(it runs out of vapor fuel). The trick is making sure the fuel atomizes as much as possible and you get plenty of air. In low O2 environments fuel won't burn. period. So if the chamber has too little o2 overall it can't overcome the inert nitrogen even if the mixture is 14.7-10:1. Just won't happen. the trick is making sure the isoctanyl is paired up with plenty of o2 molecules close at hand. If you have alot more air in the cylinder overall(it WONT situation you have alot more molecules than in lean burn with a TP) you have more o2 molescules close to each drop of fuel, more nitrogens yes but the nitrogen only acts as barrier under lower o2 levels and non compression. More air means higher ignition probability.

The other road that is available. . is to flow a compound that is much more ignition friendly than gas. This would simply ensure ignition every spark. Much more complicated system but there it is.

[rmay635703]

You might consider a DIY ceramic coating of your piston head since they are out and about anyway, that should solve most of your lean run holes

Pistons (Dave Baker; Dirk Broer; Dave Williams; John De Armond; Chris BeHanna)
Advanced Coating Technology by Swain Tech for Automotive Coatings including engine piston coatings, ceramic coating services engine, automotive ceramic coating, ceramic header coating, dry film lubricant, race engine coatings, exhaust header coating

(I can't find the ceramic coat I was thinking of but you get the idea)

Also
Kal Gard High Performance Oil and Accessories

A good spray on coating for the inside of your engine block.

Both of these should "help" with lean run detonation issues.

Worth a look

[Christ]

What's going on with this?

[nemesis]

I've been thinking about the same thing for a couple of weeks, didn't know that somebody is actually doing it, I'll be watching this.

[rmay635703]

Originally Posted by Christ

What's going on with this?

No pistons = no more experiments

I hope he follows my advise so he doesn't have to take them out again in short order.

[Christ]

Originally Posted by rmay635703

No pistons = no more experiments

I hope he follows my advise so he doesn't have to take them out again in short order.

I've got some higher compression pistons that I'll offer up for the cost of shipping, they still have the rods attached.

PM6B with 1.6 rods.

[basslover911]

Any updates?

[Christ]

I, too, have been patiently waiting for some kind of update to this.

[Xelas]

Honda already uses something like this in the engines for the 2006+ Civics:
Honda Worldwide | July 5, 2005 "Honda Develops New 1.8l i-VTEC Engine"

From the link:
"With the i-VTEC engine, however, intake valve closure timing is delayed to control the intake volume of the air-fuel mixture, allowing the throttle valve to remain wide open even under low-load conditions for a major reduction in pumping losses of up to 16%. Combined with comprehensive friction-reducing measures, this results in a significant increase in fuel efficiency for the engine itself."


It is a drive-by-wire engine, with the ECU taking care of throttle position, valve and spark timing, and exhaust gas recirculation to increase efficiency.

I have a 2008 Civic, and because of the different engine, I get better mileage with steady cruising than with P&G.