Forums Blogs Marketplace. Recommended Posts. Llfr 0. Neutral Newbie September 10, I have read up on the definitions but I still don't understand. Share this post Link to post Share on other sites. Porker 18, Turbocharged September 10, Quantum 1, Seanboi Maybe u can do a search on Wikipedia to learn more? DOHC more power at high end.
I did a search and understand the different valves involved. Neutral Newbie September 10, edited. Sorry ah.. I'm a noob to VTEC. One leg hopping is faster coz, 'One leg hopping' Honda Civic eats most 'two leg running' cars in same sergment. Crummytyre 0. Blame Honda marketting. Comparatively the Civic, whilst only 13kW more, feels considerably more powerful under all circumstances. That's because it doesn't have any efficiency work done on it.
No variable valve anything to boost low RPM torque. So its number are only valid when at close to the peak power and torque RPM. JACE, do u drive an auto? Tell me more about the jazz vtec. Is it even i-vtec?
It just says vtec on the engine cover. I know its offtopic but want to know. LOL, typing this while watching soccer.
Jazz 1. Below rpm, one of the intake valves is closed so that the intake comes in from one side and the shape of the piston head directs the charge so that it swirls around in the head for complete burning. So you get good torque at low rpm. Above rpm, 1 intake valve is not enough to fill the cylinder quick enough, so both valves are opened by VTEC.
So effectively, you get double the intake area above rpm. So when you look at dynos of the torque chart, the torque is higher as your RPMs increases. Opposite to that of economy engines where the torque is high at the middle rpms and starts to taper down as RPM increases. The engine also has molybdenum coating on the piston skirts it was the first non-performance honda engine to get it , while the intake manifold is divided into 2 so that the 2 farthest cylinders still get enough air without being blocked by the closest 2 cylinders.
What else Someone check underneath their car to confirm this! It should be nice and shiny. Opposite to my Accord euro with steel headers that are dull and brown.
This thread makes me wish that Honda would differentiate between the different VTecs more explicitly. The SOHC honda engine is designed for fuel economy.
Sorry for my ignorance on this subject as I am still learning about these concepts, however, the Atkinson cycle is probably a more appropriate name for what Honda is trying to do with the i-VTEC in the 06 Civic. The main difference between Miller cycle and Atkinson cycle is that Miller cycle always use supercharger to compress the charge.
The Atkinson cycle is a Miller cycle without the supercharger, so it provides efficiency at the expense of power. In the Miller cycle engine, a supercharger 'over-compress' the fuel-air mixture. When the piston moves upward to compress this charge, the valve is allowed to open for longer than usual, so some of the charge is pushed back out into the intake manifold.
The Miller cycle engine is advantageous as long as less energy is used by the supercharger to compress the fuel-air charge than what the piston would use during compression stroke. This is where VTEC is can be used to increase the valve timing when the advantages are present.
I know some part of what I said contradict aaronng's posts, I could be wrong conceptually and I don't know enough about Civic engine to comment on specifics.
I am open to suggestions A miller cycle engine without a forced induction to bring up the filling efficiency is called an atkinson cycle engine. Why did I refer to the miller cycle instead? TerryMit 09 May Zaimdog 10 May Francisrof 16 May RobertChade 01 Jun CasinoX 03 Jun TerryMit 05 Jun Belio 05 Jun Zaimdog 07 Jun Francisrof 09 Jun SUE 14 Jun RobertChade 16 Jun CasinoX 17 Jun TerryMit 18 Jun Dzhinsa 18 Jun Francisrof 20 Jun RobertChade 22 Jun CasinoX 23 Jun TerryMit 24 Jun Zaimdog 25 Jun Francisrof 26 Jun RobertChade 04 Jul CasinoX 06 Jul TerryMit 07 Jul
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