Honda motors are hardcore. In Japan, they are seen as mavericks, but in America they are seen as household appliances.... its sad to see how tainted Hondas name is here.

 

thats one clean civic

 

im pretty sure the engineer that invented it was employed by honda, Ikuo Kajitani.
honda patented it. why do u think they were the only cars with variable valve timing? when there patent ran out....other motor companys used it.

 

My friend in town has a boosted Del Sol on a totally stock motor (sohc too!) @ 231 hp and daily driven. Guess how many miles in current boosted condition? 55k miles! No joke! Only "tuning" is a FMU, Walbro, and his trusty AFC. We call it his miracle child.

We're currently building him a 300+ sohc monster, forged, LSD, weight-reduction, the works.

HONDA FTW!

 

"The first experimentation with variable valve timing and lift was performed by General Motors. GM was actually interested in throttling the intake valves in order to reduce emissions. This was done by minimizing the amount of lift at low load to keep the intake velocity higher, thereby atomizing the intake charge. GM encountered problems running at very low lift, and abandoned the project.

The first functional variable valve timing system, including variable lift, was developed at Fiat. Developed by Giovanni Torazza in the 1970s, the system used hydraulic pressure to vary the fulcrum of the cam followers. The hydraulic pressure changed according to engine speed and intake pressure. The typical opening variation was 37%."

Also, alot of systems work in different ways. - Fishey

* BMW VANOS - Varies intake and exhaust timing by rotating the camshaft in relation to the gear.
* Ford Variable Cam Timing - Varies valve timing by rotating the camshaft
* GM DCVCP (Double Continuous Variable Cam Phasing) - Varies timing with hydraulic vane type phaser (see also Ecotec LE5).
* Honda VTEC - Varies intake, duration, and lift by using two different sets of cam lobes
* Honda i-VTEC - Adds cam phasing (timing) to traditional VTEC
* Hyundai/Kia CVTT
* Mazda S-VT - Varies timing by rotating the camshaft
* Mitsubishi MIVEC - Varies valve lift
* Nissan N-VCT - Varies the rotation of the cam(s) only, does not alter lift or duration of the valves.
* Nissan VVL - Varies intake, duration, and lift by using two different sets of cam lobes
* Porsche VarioCam - Varies intake timing by adjusting tension of a cam chain
* Porsche VarioCam Plus - Varies intake timing by adjusting tension of a cam chain as well as valve lift by different cam profiles
* Rover VVC - Varies timing with an eccentric disc
* Suzuki VVT
* Subaru AVCS - Varies timing (phase) with hydraulic pressure
* Toyota VVT-i - Varies intake timing by advancing the cam chain
* Toyota VVTL-i - Varies timing by advancing the cam chain and switching between two sets of cam lobes


- Linked from
http://www.madabout-kitcars.com/kitcar/kb.php?aid=211

Feel free to read that as it gives some good information..

 

the big H has some of the best flowing cylinder heads in their new K series motors that are currently out in the market. The heads in the rsx-type s and new civic Si can flow nearly 300cfm unported with a lumpy cam. That is fricking rediculous, especially when you cosider that they manages to do it with out killing intake velocities...

 

actually it was triumph or maybe alfa romeo back in the early 60's that started it.... Honda just perfected it..

 

buy one, mod it, and you'll fall in love

 

Your source is wrong on this one, but otherwise good info.

MIVEC varies cam phasing... not lift or duration.

 

Depends on which engine you're talking about. The 4B11 and 4G63 MIVEC only vary cam phasing, the 4G69 varies both the cam, lift, and duration.

 

Interesting, I was not aware of that. Learn something new every day!

 

I thought VTEC was Very Tiny Engine Components, or maybe it was Valve tick Extremely Common. I can't remember which.

 

You bumped a month old thread for this 3/10 troll attempt?

 

So what is good about it?