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I don't understand the arguement. On Dec 19 Civic04 asked:
Quote:
Originally Posted by Civic04
so normal running conditions (pre vtech) both exhaust valves open all the way and 1 intake valve opens all the way and 1 intake valve opens part way. When vtech kicks in under the preset conditions both exhaust valves open the same as before (becase no vtech on the exhaust side) and both intake valves open (fully) in the hotter cam profile .
Yes? No?
Everyone agrees this is the definition of VTEC.
The picture of the valve at TDC was errantly described as "TDC for cylinder 3" and explained it is cylinder 3 at engine TDC. Therefore, correct me if I'm wrong, the picture shows the one fully opened valve at 38.604 mm (using the numbers from post #1), one valve that is cracked at 32.848 mm, and the exhaust valves closed. If VTEC were engaged for the picture, both intake valves would be at 38.604 mm and the exhaust closed. VTEC does not affect the height of the exhaust valves, which are both the same height (38.784 mm).
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...About my '02 EX
I thought I got this **** like 2 weeks ago, but now when I read the entire thread, I'm just confuddled about sumthin. The VTEC allows for milleage saver UNDER 4500 RPM's, right? If yea, then over 4500 is like driving the engine without VTEC but under is where we actually see the use of it?
Bottom line: Does the EX get ANY extra power from the VTEC or does it just help me save gas under 4500 RPM?
Sorry for being such a noob, but I drove GM suv's all my life and then I went to 95 civ DX economy. I know nothing about performance tuning with Hondas.
SOLD 2002 Silver Honda Civic EX Coupe Tenzo R Rallye-2 Seat Base RSX Shift Knob Redline Goods Custom Shift Boot DC Sports Short Shifter AEM SRI Neuspeed Strut Tower Bar Eibach Sportline Springs 7thGen.MT.C.
Last edited by JesterMasque; 03-16-2005 at 04:07 AM.
VTEC allows for less gas to be used before the more aggressive cam engages. Therefore, it is to enhance better gas mileage before VTEC engages and to provide additional gas (more power) after VTEC engages.
__________________ "Fritter and waste the hours in an offhand way."
SOLD 2002 Silver Honda Civic EX Coupe Tenzo R Rallye-2 Seat Base RSX Shift Knob Redline Goods Custom Shift Boot DC Sports Short Shifter AEM SRI Neuspeed Strut Tower Bar Eibach Sportline Springs 7thGen.MT.C.
EX's have roller rockers, both intake valves work off the same cam lobe over +/- 4500 rpm's when a hydraulic plunger locks both roller rockers together. Below vtec only one valve opens fully and the other partially, working independentaly.
i could give a fvck if you like me or not so next time you wanna send me some rep, have the balls to put ur name there (even though i can se everyones name who leaves me rep anyway).....oh and good job hiding it in a thread that you didnt post in. your not on my level.
EX's have roller rockers, both intake valves work off the same cam lobe over +/- 4500 rpm's when a hydraulic plunger locks both roller rockers together. Below vtec only one valve opens fully and the other partially, working independentaly.
I was really tempted to pick at this, but for the sake of the point of "WHEN VTEC kicks in on the EX" not being beat to death, I'm going to shut my mouth and look away...
If you didn't notice, this topic has been finished for a while. And do some research before you post any kind of technical stuff on here. We do have n00bs running around you know
SOLD 2002 Silver Honda Civic EX Coupe Tenzo R Rallye-2 Seat Base RSX Shift Knob Redline Goods Custom Shift Boot DC Sports Short Shifter AEM SRI Neuspeed Strut Tower Bar Eibach Sportline Springs 7thGen.MT.C.
This is ridiculous. 
Caorndorff 
