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Search: Posts Made By: omgwtfbyobbq
Forum: Experiments, Modifications and DIY 01-16-2007, 01:06 PM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
Sweet. And I just need to make sure that I'm...

Sweet. And I just need to make sure that I'm deactivating two cylinders that move together (https://www.autozine.org/technical_school/engine/smooth2.htm), like 1 and 4 or 2 and 3.
Forum: Experiments, Modifications and DIY 01-15-2007, 11:49 AM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
So I can do this with a carb'd engine? Does the...

So I can do this with a carb'd engine? Does the carb just mix a certain amount of fuel with a certain amount of air, so with two valves not opening, the carb just won't mix any fuel in? Regarding...
Forum: Experiments, Modifications and DIY 01-13-2007, 02:49 PM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
Yeah... That's the problem with automatics and...

Yeah... That's the problem with automatics and their kick-down crap. In a situation like this turning it off from the cab would be the best bet since the driver could cut fuel under low load/flat...
Forum: Experiments, Modifications and DIY 01-12-2007, 10:49 AM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
Running it in a higher gear just to avoid...

Running it in a higher gear just to avoid vibrations defeats the purpose of the experiment. That combined with richer running, and it's no wonder the mileage was worse. At the very least, we need a...
Forum: Experiments, Modifications and DIY 01-11-2007, 04:12 PM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
It could be because of the ECU going into closed...

It could be because of the ECU going into closed loop... The difference in mileage for something like a normal versus lean burn civic is ~20% at cruise iirc. So if going from ~15:1 to 17-19:1 allows...
Forum: Experiments, Modifications and DIY 01-11-2007, 11:44 AM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
There's a lower limit for doable (no custom motor...

There's a lower limit for doable (no custom motor mounts etc) small engine swaps and I'm trying to figure out whether a gasoline engine can be modded relatively easily to get the same mileage as a...
Forum: Experiments, Modifications and DIY 01-10-2007, 06:33 PM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
Depends on what you mean by pumping air in and...

Depends on what you mean by pumping air in and out because we have two situations that describe that.
-Just killing fuel to two injectors.
-Killing fuel to two injectors and pulling the spark...
Forum: Experiments, Modifications and DIY 01-10-2007, 02:18 PM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
I think you mean marginally more power. ;)

I think you mean marginally more power. ;)
Forum: Experiments, Modifications and DIY 01-10-2007, 11:54 AM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
Good point about the behavior of the O2 sensor,...

Good point about the behavior of the O2 sensor, probably why most manufacturers use the air spring approach. Obviously, running in open loop mode would avoid a really rich condition, so killing the...
Forum: Experiments, Modifications and DIY 12-28-2006, 10:46 PM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
I'm checking it out now. I found this...

I'm checking it out now. I found this (https://www.motorcycle-usa.com/Article_Page.aspx?ArticleID=3909&Page=1) on cylinder deactivation for a CBR1100 prototype , and it looks like Honda is being way...
Forum: Experiments, Modifications and DIY 12-28-2006, 10:56 AM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
But a DIY economy minded driver who puts this...

But a DIY economy minded driver who puts this system in is not going to drive according the the EPA driving schedule. And the system, which is very touchy and switches on/off quite a bit, will be on...
Forum: Experiments, Modifications and DIY 12-28-2006, 09:02 AM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
Here's...

Here's (https://www.canadiandriver.com/articles/jk/041020.htm) some more on DoD.
Forum: Experiments, Modifications and DIY 12-28-2006, 08:52 AM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
I never said it will equal that. But it will be...

I never said it will equal that. But it will be the greatest increase w/o pulling apart the engine. By cutting fuel to two cylinders we cut pumping losses in half, which should have the biggest...
Forum: Experiments, Modifications and DIY 12-28-2006, 02:13 AM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
Because it's easier to just kill two injectors,...

Because it's easier to just kill two injectors, have two cylinders firing that require twice as much air from the throttle, with the two dead cylinders getting twice as much air as well... Compared...
Forum: Experiments, Modifications and DIY 12-28-2006, 01:16 AM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
I think theclencher's take on mileage increase is...

I think theclencher's take on mileage increase is accurate. The EPA tests have the car bouncing around in terms of speed, so who knows how often DoD is actually activated. I'm guessing that a four...
Forum: Experiments, Modifications and DIY 12-27-2006, 09:06 PM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
Think about it this way. Diesel engines are...

Think about it this way. Diesel engines are already BTU corrected by the EPA for mpg figures. And in the same car with the same transmission diesels get ~30-40% better efficiency, partially because...
Forum: Experiments, Modifications and DIY 12-27-2006, 03:02 PM
Replies: 75
Views: 27,519
Posted By omgwtfbyobbq
Air movement does incur a pumping loss, but the...

Air movement does incur a pumping loss, but the biggest contributor, what people talk about wrt gassers, is the pressure difference between the crank case and the closed cylinder as it moves down. At...
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