Building up a sohc d16 on a 98 civic ex

Originally posted by Almighty-Si



This I dont understand so well, what are you saving from using a D16 over a B16? Is it the hundred pounds you save using a D16? Yes I have to agree that Honda engines are pretty torqueless but how can you say Horsepower means nothing? What makes a 99 Si almost 2 seconds faster in the 1/4 mile than a 99 EX? Oh wait I got it...it's the weight right? Oh no, the Si is heavier...ok ok I got it.....it's 4 extra ft lbs of torque right?

I realized I did not address this issue of putting an 99Si up against an 99EX.

Okay, first of all, they both have 1600 CC's of displacement. And they both have Vtec. They weigh about the same other than the Si DOHC is heavier than the EX SOHC.

The Si will be faster due to the fact of the DOHC head and the fact that the engine is more efficient in air flow and fuel management by means of the Intake Cam and the Exhaust Cam. SOHC have only one to take care of both, (hence Single Over Head Cam), which means less efficient burning. The throttle Body is bored bigger, the intake manifold is honed bigger, Bigger pistons, longer stroke, higher compression ratio, higher fuel oil pressures. I can go on with tracking, exhaust size and so on and so forth.

OH BTW, I never said the EX would be faster than the SI. It wouldn't be OEM. That's physically impossible at that point! You can mod it to be, and those two seconds you spoke of can be reversed! When speaking of weight, I was speaking clearly on edge over the other. That alone will help! I never said that alone will beat the other, did I? Again, don't be reading between the lines.