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Hey all. I was wondering if anyone has any more info on the pistons and rods that are supposed to be coming out soon. I'm curious because I'm concerned that the application will be for the EX and they have .1 liter advantage, which leads me to conclude that their cylindar walls have a larger diameter, and thus the new pistons will be slightly larger then would be for LX model engines. If anyone has a little more info on this please respond.

 
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Who told you that the EX's have a .1 litre advantage? That's not right. The EX and LX engines have the same displacement; both are 1.7l engines.

 
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Woo hoo!

Heh bad brain fart. You made me a happy man!

 
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That sucks, our 1.7L are basically same bore as the 1.6L but just have a longer stroke (rods). If they were a 1.7L with a short stroke, we could probably get longer rods and have 1.8L without the overbore.

 
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The difference between ex and lx is the compression rate[IMG]i/expressions/beer_yum.gif[/IMG]

 
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That would be all good except, longer and shorter rods don't just change the stroke/displacment of the piston. They also change redline and where in the powerband the engine makes the most power.

 
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well if the bore is the same, and only the stroke is different, why can't we use the really nice low compression crower forged aluminum pistons from the B16?

 
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I don't know? If that's true, then what would that do to our engines? Increase compression or lower it? If we could lower the compression even more then we could run higher boost levels. Woohoo! The only thing that might be different would be the diameter of that crank shaft thingie that connects to the piston. Why wouldn't manufacturer's of older products advertise them for newer things if they fit? You know? If they aren't advertising, then they're losing money. I think there must be a reason why they aren't advertising them for the 7th gen civic. Probably because they don't fit in some way.

 
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If the bore is the same, we should be able to use low or high compression pistons.
Depending on the needs. Lower compression = less power and more boost, then more power at the end!
Higher compression = more power all the time, and less boost!
they might fit, but does they fit with the rods?

 
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I'm sure they would fit, I guess now the concern would be whether the Connecting Rods and Wrist Pins would match up.

 
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Yeah, exactly. Those things. I didn't know what they were called. Also, if the location of the valves is different, then bye bye piston. I guess you could put them in and then just turn the crank and check if they're clearing everything.

 
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Hey Grey, Can you just shave the bottom edge of the head to do the same effect?
higher compression rate!!!!!

 
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Yeah, of course. That's what the concept civic did to put out 170hp. I want to do that as well. That, port and polish, a slightly bigger exhaust, a nice 4-2-1 header, a higher flow catalytic converter, some aluminum pistons, more aggressive camshaft, new valve springs, and what not. I should put out clsoe to 200hp with ease. Then maybe a little nitrous or a supercharger and I'm off. [IMG]i/expressions/face-icon-small-smile.gif[/IMG]

 
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Hell yeah! that's what i'm talking about. The thing is that I noticed that our car, well, my car 's got a dc sport header and they are relatively thin compared to the old style civics, is weird that with a bigger engine we get a smaller headers. So if we port and polish and everything else, the exhaust exit to the manifold in the head might be bigger but,,, we might need bigger diameter headers. Right?

 
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Not really. The size of the headers is taken from the size of the engine. If we increase the capacity, then we need to get rid of more exhaust gases. The stock size should be optimized for the stock capacity, 1.7l. Also, with a turbocharger the bigger the exhaust the better. That is the only exception.

 
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I understand this Grey but,
What I am saying is that a stock civic let's say 95, has bigger headers, or at least they sell bigger headers than for our civics, both of them with stock heads, I saw this a couple of times, I don't get it, plus everybody from the shops ask me to see the headers, and they say "wow man they are thin, check this out," so they show me a 1.6l headers which are a lot bigger!

 
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Hum... Yeah, I get you. We will not need bigger headers as you asked though. I wonder why that is? They're thicker walled and bigger diameter?

 
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What are you talking about? old 1.6 headers?if so, yes, they look huge compared with mine! I don't know if somebody in this forum has another older civic and have seen what I'm talking about!
You know!, that's why I think our civics don't have the power we expect. See an SI has 160hp and lile 107 of torque. It's got less torque than ours and this is very very important, but it's got more hp, and is not because the twin cam, noooo, is because the higher compression rate, intake and exhaust. The head basically, we got more torque cause we have a bigger engine and we should have more power if we have more displacement. The torque,mmmm, very important, think of the torque like, let's say,,,,
you have a bolt, you have a 1 feet rachet, and you can apply 100 pounds of force to the rachet (100ft-lbs).
It's going to be hard to turn this bolt even though you are aplying 100 pounds with your arm, right,,,,,but if you go and get a 2 foot rachet, you are going to increase the torque to turn the bolt with the same power. Now is going to be easier to turn it! final word hp is nothing without torque and we got more torque. So if we mess with the heads ( which I think is the most restrictive part on our cars) we can get more power. Also, this is a fact, by decreasing the diameter of the tires, we will get more power to the wheels!!!
It is amazing what a 2k1 EX does with 195/50/R15, handling and accelerating wise!!!
So we need to do something with the heads!!!![IMG]i/expressions/beer_yum.gif[/IMG]
Am I right or wrong! Please correct me if I'm wrong!

 
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What do you mean what am I talking about? I asked if the header that you saw. The one made for the civic with the 1.6l engine was of a bigger diameter, or was it thicker walled, or both? I.E. Did you get a good look at the old header (1.6l one) and compare it side by side with the new header (1.7l one)?

 
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No man, they are bigger in diameter I couldn't see the inside because they were installed, but they are big enough to notice that the inside is also bigger, What do you think!
Also check my last post because I edited it!
Also tell me what you think!

 
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I thought it is the INNER diamater and tube length that counts? [IMG]i/expressions/face-icon-small-confused.gif[/IMG]

The thinner wall might be a result of cost cut/emission/weight savings?

 
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That's what we are saying, that the header, the whole thing looks like is just bigger than ours. But hey, Ihave seen the outside, what I am saying that I am pretty sure that the whole thing is bigger. [IMG]i/expressions/face-icon-small-confused.gif[/IMG]

 
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Alright,,,,,,,,,you should get neo to rip the heads off his 99 civic........(or whatever year it was)

haha....then youd see.

[IMG]i/expressions/face-icon-small-wink.gif[/IMG][IMG]i/expressions/face-icon-small-wink.gif[/IMG][IMG]i/expressions/face-icon-small-wink.gif[/IMG][IMG]i/expressions/face-icon-small-wink.gif[/IMG][IMG]i/expressions/face-icon-small-wink.gif[/IMG][IMG]i/expressions/face-icon-small-wink.gif[/IMG][IMG]i/expressions/face-icon-small-wink.gif[/IMG][IMG]i/expressions/face-icon-small-wink.gif[/IMG][IMG]i/expressions/face-icon-small-wink.gif[/IMG][IMG]i/expressions/face-icon-small-wink.gif[/IMG][IMG]i/expressions/face-icon-small-wink.gif[/IMG]

 
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Yeah... Hum... If the header for the 6th gen civic has a larger diameter than ours then that might be due to that thing called shockwave tuning. Maybe the designers increased the exhaust output size to improve horewpower within a certain range? They might have done the same thing with ours to improve gas mileage. That's what I think they did.

So yeah... A port and polish and a bigger header might make your beast burn more fuel, but also produce more power. That's something to think about.

About putting on smaller overall diameter wheels... That's what I was thinking of too. I'm not too worried with the civics acceleration from 0 - 60 though. I'de like to get from 60 - 120 quicker. The smaller diameter wheels would give us the acceleration we need when in 5th gear. We'de eat through the gears faster too.

As for the heads. A dual overhead cam would be nice to control the intake and exhaust valves independently. Shaved head for higher compression would be nice too, as stated earlier. That's what I'm going for myself. That and an aggresive cam shaft that keeps the intake valves open longer and the exhaust valves open longer will net really nice results. Should be better than VTEC camshaft or at least of similiar power if the VTEC camshaft is maxed out. That means that an LX would have the 127 horses throughout the entire powerband, unlike an EX that only engages the more aggresive portion of the VTEC camshaft during a set rpm. [IMG]i/expressions/face-icon-small-smile.gif[/IMG]

 
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Remember that you will not get 127hp in the entire powerband never!!!

 
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I think there is type r pistons out.