I saw a 92-95 civic hatchback in a magazine and under the specs it said 1.5L, 4 cylinder, 8 valve. Is that wrong, or were there any made like that?

And I know this question is stupid but how would it affect the performance if our cars were 8 valve?

 

the D15B8 has 8 valves.......i <u>think</u> thats the 92-95 civic cx

 

yes- there was an 8 valve model- I saw a gutted one w/ N2O run 12's last year at the track

 

Yes, the '92-95 CX (D15B8) had the 8-valve engine. However, the pistons still have four valve reliefs cast into them, so a 16-valve head from a DX (D15B7) could be swapped on easily.

 

i remember looking at an older 88-91 8valve head and admiring it's roller rocker style of cam rockers! if only they made 16v w/ that setup you'd have a 11krpm machine! weeeeEEEEEEEEEEEE!

 

88-91 crx hf---8 valve with roller rocker arms
92-95 civic cx---8 valve
2003 civic hybrid---8 valve and 8 spark plugs

 

So was the CX a hatchback, or was there a sedan with 8 valves too? And how much does having 8 valves hinder the performance?

 

bump for my last questions... and I was wondering if anyone has a picture of those roller rocker arms and can tell me how they work?

 

Another bump... why did everyone stop postin?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by OldSchoolHatch &raquo;</TD></TR><TR><TD CLASS="quote">So was the CX a hatchback, or was there a sedan with 8 valves too?</TD></TR></TABLE>
CX models are hatchback-only.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">And how much does having 8 valves hinder the performance?</TD></TR></TABLE>
Since there are only 8 valves, that means there is only 1 intake valve for each cylinder, and 1 exhaust valve. This, of course, is a bottleneck to the flow in and out of the cylinders. A 16-valve engine, in comparison, has 2 intake valves and 2 exhaust valves. This makes for two entrance and exit paths for flow through the clyinders, allowing more air/fuel mixture in, and more exhaust out - thus increasing the efficiency of the engine, and increasing the specific output (horsepower per unit displacement).

This is the way I understand it; if I'm wrong, someone correct me.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by OldSchoolHatch &raquo;</TD></TR><TR><TD CLASS="quote">and I was wondering if anyone has a picture of those roller rocker arms and can tell me how they work?</TD></TR></TABLE>
Here is the idea behind the purpose of rollers in the valvetrain. Now, the pic shown there is of a pushrod engine which has actual "roller-rocker arms." Overhead cam engines, as in our Hondas, have pieces called "cam followers" instead of rocker arms.

Crane makes roller-tipped cam followers for B-series engines, but they must be used with cams designed specifically for this purpose; standard B-series cams will not work. As of right now, I think Crane is the only company making these cams and followers for B-series engines.

The D15Z1 Civic VX engine and D16Y5 Civic HX engine are equipped with the roller-tipped cam followers fro the factory; however, they are of no use to us from a performance standpoint, since they are VTEC-E engines. Also, according to the others in this thread, the 8-valve D15B6 CRX HF engine is equipped with roller-tipped followers. That's something I didn't know before . . .

All of Honda's new K-series engines use roller followers as well.

 

Thanks for the reply man, that's what I needed to know.