[Xist]

Originally Posted by BabyDiesel

Also, have you ever heard of deleting two valves (1I, 1E) per cylinder? I read about it somewhere on a 16v Honda motor... and it helped FE! Probably hurt power... but that's overrated

I have heard about people trying that and it sounds nearly impossible to implement. Your engine balance will be off and it is extremely difficult to seal off everything. I guess that if you delete matched valves they will balance...

Referring to deleting one cylinder:

Originally Posted by Frank Lee

The bad vibes will drive you nuts within minutes.

http://ecomodder.com/forum/showthrea...tml#post243784

Originally Posted by Diesel_Dave

the cylinder delete is a REALLY bad idea. For one thing, that would be an extremely involved process

http://ecomodder.com/forum/showthrea...tml#post244043

Originally Posted by Frank Lee

Deactivating cylinders reduces pumping losses two ways: 1) there are fewer working cylinders moving air around, and 2) the remaining cylinders- each now working harder to produce the same total output- require the throttle plate(s) to be open more. The more open a throttle plate is, the less the engine is working to overcome the vacuum behind it.

The reduced pumping losses from fewer working cylinders are but one component of why deactivation works; because the remaining cylinders are each working more at their capacity- getting a fuller air/fuel charge- the combustion pressures and tumble/swirl velocities are much higher and thus more efficient, in the same way we know that any ICE is more efficient at near wide open throttle than at near idle.

Originally Posted by Frank Lee

As an experiment I deactivated two on my four cylinder and it wouldn't start

http://ecomodder.com/forum/showthrea...tml#post404239

Originally Posted by ChazInMT

Only 4% of the engine loss is due to pumping loss (See This) so it isn't like you'll double your mileage by eliminating it.

[...]

I'm 99% certain no one has ever done a homemade cylinder deactivation and gotten outstanding results from it, power decreases immensely, the engine management system would hate it and need to be modified to the point of causing madness, and you may not see any gain in fuel efficiency.

http://ecomodder.com/forum/showthrea...tml#post404240

Originally Posted by Old Mechanic

I think deactivation will be a tough sell in a 4 cylinder engine, taller tires or lower overall gearing is a better tactic.

http://ecomodder.com/forum/showthrea...tml#post404348

Originally Posted by MetroMPG

Ironically, Honda just settled a class action lawsuit related to their 6 cylinder engines equipped with cylinder deactivation:
http://www.autonews.com/article/2013...-burning-claim

http://ecomodder.com/forum/showthrea...tml#post405393

I need to be somewhere, but that should be a start. You can also read http://ecomodder.com/forum/showthrea...ion-14526.html, those were just the first few threads that came out of the search box.