p_expresss1

Hey guys kinda new posting here but in the middle of a gas mileage project. Picked up a 94 civic vx with the d15z1 suppose to get 48 in the city and 55 on highway well.. **** thats good and to be honest never seen a vtec-e before. I've been reading around to see if anyone has done anything to this engine and can't seem to find much on it so here is what ive done so far, Now I know this motor is only 90hp but thats not the point more gas mileage is however. Took the motor down seen that it has some deep dished pistons low compression 9:8 or something like that did a little looking around and ended up getting a set of pm3's out of a d15b7 at the junk yard for 60 bucks. Now i know this is going to drive the compression way upi believe around the nieghborhood of 13:8 also the PM3 has about 0.0040 more lift than the old dished pistons so first things first the combustion chamber and ports will need some attention if you look the right side depending on how you hold it is more dished than the other has a notch sticking out first grind it out match it with the other side now mind you if you've never done anything like this before dont try this at all one wrong move and your ****ed. ok this will bring you down quite a bit 12:4 or so still thats not quite enough for me may be ok with pump gas may not but im not going to take the chance. So thought about it for a while and decided to go mill the piston tops 0.0020. With a 0.0060 gasket this will put you right at 11:1 which means a little more power and hopefully more gas mileage. Anyways not quite complete yet waiting on some parts to come in but will keep you everyone posted on how it turns out. but maybe this will help get you started on your gas saver so far this project has costed me $190 thats a rebuild kit and the pistions waiting on vavles hope to at least reach 60mpg with a nice ram air and a few bolt ons should geta little more

evilclown312

iTrader: (2)

Your going to have too tune, and thats going to up the cost a good bit.

cheggie

Doing some quick math,

12000 miles per year / 55 mpg hwy = 218, 218*$3.75= $818.00 fuel cost for a year

12000 miles per year / 60 mpg hwy = 200, 200*3.75= $750.00 fuel cost for a year

Thats a savings of $68 per year IF you actually get 60 mpg from your proposed mods.

My vote is to leave the engine alone, do a proper alignment, eliminate extra weight, and check the tire inflation regularly. You will waste money tearing into that motor to change things around, and you're probably not going to be happy with the results.

$190 could have bought you 50 gallons of fuel already....