white92d15b7

Sooo i rack up alot of highway kilometres in my winter beater, travelling all over the place for my job, i decided gas prices were getting crazy, i was spending too much so i decided ot experiment with my ef Si, first thing i did was get some d16y7 injectors . . . . got 60 more kms per tank .. . decided then that i wanted more, installed an hf ecu. . . . got another 200 kms per tank, now im somewhere in the 800 kms per tank range . . . then i wondered what else i could do, then it hit me ot shut off some injectors, 2 cylinders on the highway was plenty for cruising, so i installed some switches to shut off each injector, seems i need either 1,4 or 2,3 working at the same time . . . now im up to 1000 kilometres on my first tank of fuel with this setup, have just under a quarter left

problems i have experienced with this . . . the damn engine light comes on as soon as i shut off an injector . . . another problem seems to be when i have 2 and 3 firing i have not alot of heat , 1 and 4 firing i have tonz of heat . . . .

so anyways when i pull off the highway i just shut off the ignition, coast on the off ramp and flick the injectors on and turn the ignition back on . . either bum start it or turn the key, same thing on the highway if i need power, flick injectors on shut the key off and back on . . .

anyways ill post more as this experiment goes along . . . .

zeeman

iTrader: (1)

it would be better/safer if you could kill the spark to those two cylinders as well as the fuel b/c the spark plug is trying to ignite a fuel-less mixture. Fuel helps keep the cylinder temps down, and without the fuel there i wouldn't be surprised if that sucker doesn't last too long.
But damn 1000km to 3/4 tank of gas.
I'd love to throw a wideband o2 in your car and see how insanely lean you're running, with those 180cc injectors and HF ecu.
How did you get those saturated injectors to work in your car that requires peak and hold? Did you remove the resistor box and fix the wiring to the injectors?

white92d15b7

removed the resistor box all together as i couldn't find one attached to the wiring in diagrams of an ek . . the 4 injecotor wires ran to the ecu and i took the yellow/blk wire and ran it to all four injectors . .

haven't really checked the ecu codes as to see what im throwing cuz i need my power off the highway . . . so i need to reset it on the fly .


had ot edit this i messed up what i did

white92d15b7

i don't think that there is a way to shut off the spark to just two cylinders . . . and the cyllinder still is lubricated from the bottom, and i think the heat is offset by no bang in the cylinder . . .

white92d15b7

so the experiment goes further i got sick of the engine light bull **** and i decided to wire in two extra injectors just taped to the intake, not hooked up to fuel . . but wired up to two three way switches so now i switch from the fueld injectors to the non fueled ones, there there just to keep the ecu thinking that there's 4 . . . i put the stock airbox back on and im getting close to 1300 kms a tank of pure highway driving . . sure i miss the power, but im loving the fuel savings

kwikb16a2

doesnt it bog down like a bastard when ur running on two cyl??

zeeman

iTrader: (1)

man, i'd love to tear this engine down and see what it looks like. Or have an egt guage on one of the cylinders with the injectors turned off. What do the spark plugs look like? have you checked?

chris_si98

some experiment..

how does it drive? how long have you been driving like this?

white92d15b7

been driving like this for 3 months now . .the spark plugs are a light golden brown obviously its running lean been checking them quite frequently. when cruising on the highway you don't need much power . . . it doesn't bog too much . . .like obviously im missing two cylinders its gonna be a little sluggish . . . . i really don't think its causing any damage to the engine, there is way less heat being created, and its not a two stroke engine where the fuel is required to lubricate it . . it still gets lubricated just fine . . . was hard to keep it warm in the winter months ,. . but seems to be staying in proper range now . . . there has been no drop in compression in any of the cylinders and oddly enough im not getting a code from the o2 sensor . . .

white92d15b7

and for the record i get amazing gas mileage from my civic better than a hybrid for that matter its a great experiment

nashall

wow im amazed.....1300 kms on one tank of gas!!!!

zeeman

iTrader: (1)

so you don't think not having fuel in 2 cylinders but spark being present doesn't cause excess amounts of heat?
Fuel helps keep cylinder temperatures down, without fuel there will be lots of heat, especially if there is spark. Its trying to ignite a fuel-less mass of compressed air. You said yourself that you are running really lean, running lean also creates excessive heat, raising the chance of detonation. And detonation kills engines.
And in a two stroke oil is in the gas to lubricate, fuel isn't required to lubricate. Fuel along with spark is required to ignite the compressed air.
The only way this so called experiment will be any sort of valid is if you tear the engine down afterwards to see the condition. I'll help you, b/c i'm very interested to see the condition of this poor engine.

imported_viper_2_4

doesn't honda (and others I think) have a similiar idea to this on the new Odysee, on the highway half the engine shuts off....mind you, i'm sure thiers is a little more sophiticated, but the same idea none the less

white92d15b7

your telling me that a little spark is creating more heat than a huge *** explosion in the cylinder 1000's of times a minuite ? think about that ? if the spark is creating more heat why won't my engine warm up to operating temperatures on cold days . . like below 5 degrees ? why isn't my engine overheating ? obviously there is far less heat being created . . . and whe nthis engine goes i'll be glad to tear it down with anyone interested in seeing this !!

and as in a 2 stroke engine the fuel is the gas + the oil sorry for that mis communication . . .

zeeman

iTrader: (1)

just b/c your car isn't overheating doesn't mean your egts aren't through the roof. Super high egts are really bad for your engine. Toss an EGT guage in there, its the only way to know for sure. But without gasoline to cool the heat caused by friction (pistons moving up and down) the cylinder temps will be high. Just b/c there isn't combustion taking place doesn't mean there isn't hella heat building up inside the cylinder.
I'd love to hear what other knowledgable people think about this. And if its so good of an idea why aren't there lots of other people doing the same thing?

white92d15b7

well if this is screwing up my motor ill see how long it takes, and since i get new sohc zc motors for 240 from the importer and takes me 3 hrs to change it drunk i think i have already paid for 2 new motors in gas savings . . . seeing as how i was filling up 8 times a month now im filling up 3-4 times . . . at 35 bucks a fill up i have already saved 490 bucks in the last 3 months. And it hasn't affected my travelling at all !!!

on another note !!! what about the new impala that shuts down 4 cylinders ? or the odssey that shuts down two ? there's some pistons moving in there too creating friction . . . would it not be screwing their motors too ?

im sticking with the fact that wether there's fire in the cylinder or not there's friction created, dispersed by the oil still lubricating them. there is way less heat created due to the fact that there isn't a big bang happening

im smelling a heated debate here hahahaha

white92d15b7

well zeeman !!! the honda god of hamilton, seems we have no one who can even touch our knowledge here . . .. seems we can't find anyone with enough thought process to even compare to us . . my hats off to you as being the only one to stand up to my theory and experimentation . .10 000 people and your the only one to challenge me or offer an opinion !!!!

Trystan

zeeman

iTrader: (1)

i wish i had a car i could try this to.
I have crome on my laptop, datalogging setup, a wideband and real time programmer so i could make sure its safe. But i wouldn't want to try this with my only car.
Its sick the gas mileage you get. Now if you could decrease all possible rotational mass and un-needed weight and make your car as aerodynamic as it could be you could prolly pick up a few more MPG.
Ever tried to figure out what your miles per gallon would be, for comparisons sake?

white92d15b7

you know what man im all about the trial and error of the d series, i have no idea what chrome and wideband are . . . i play with wires, and make it work, i disconnect and cross till the engine light goes off, i dunno what to say bro . . . .wanna team up amd ,ake the most fuel efficient civie ever . . better than honda has even done ? im getting 1150 stable kilometres from a tank of fuel here with a non hybrid civic !!!! D SERIES RULES !!! maybe two heads can make it more !!!!!!

zeeman

iTrader: (1)

i bet if i tossed my wideband in there i would only make your mileage worse after i saw how lean the air/fuel ratio is. Your probably cruising around with an AFR of 16.5:1. Thats about as lean of an AFR i've ever been able to cruise around with without any bucking/missing or major issues, but i'm willing to bet the EGTs were through the roof....i'll never know until i get an EGT guage, which will probably be never, so i'll just stick with a safe AFR, which is about 14.5-15:1 during crusing/partial throttle.
Very interesting experiment none the less.
Props.