Viperman and all other car freaks here, do u know whether this is a V-TEC engine? It is the engine of a Honda Accord LX 2001 model, but i can't tell whether its V-Tec or not. And what is the difference between a V-TEC engine and a normal one?

I would say 9 times out of 10 it is a VTEC with a single cam. 2001 Honda Accord LX. The DX uses the normal non VTEC SOHC engine and the EX and LX use a SOHC VTEC engine especially from 98 - 02. I read my reply again and I'm not even sure if I answered your question!

Engines have inlet and exhaust valves. These inlet valves let air into the engine and the exhausdt/outlet valves expel the combusted air when the spark plugs have ignited the fuel and air mixture. Some cars have 2 valves per cylinder (one inlet and one outlet), some have 3 vales (2 inlet and one outlet), in recent times most manufacturers have gone for 4 valves per cylinder (2 inlet and 2 outlet). Cars with 16v badging are the obvious ones. These valves are lifted and closed with camshafts. Some engines apply Single Overhead Camshafts (SOHC) and some engines apply Double Overhead Camshafts (DOHC)

The valve timing (opening and closing) sequence, how long the valves are opened for before they are closed. The length of time of opened or closed valves is indicative of how much air is allowed into the cylinders to be burned. Hence the other denotation of variable valve timing.

The SOHC engine uses the single camshaft to lift and close the valves while the DOHC uses one bank of camshaft for low RPMs and uses the other bank for high RPMs.

In my understanding the art of optimising the opening and closing of these valves to achieve better performance from an engine of a certain displacement without turbo or supercharging. Hondas are known for their screaming engines. The VTEC engines are known to develop more power at higher rev ranges compared to normal or induced engines depending on if they are optimsed for performance or economy. The Honda S2000 for instance has a red line of 9000 rpm and pulls harder from 6000 rpm when other engines will have have run out of breath.

Honda pioneered this technology but you now have other manucturers with different flavours of the same. Mitsubishi (MiVECS), Toyota (VVT-i), BMW (Valvotronic)

I'm no Engineer so I'm sure other Nairalanders with better knowledge can add or even disagree with me.

The formation of this engine is not the v tech format.

@Pro0212

What exactly did you post??!

@Ivvie

If you don't understand my post google is your friend,

No offence intended.

proo212:

@Ivvie

If you don't understand my post google is your friend,

No offence intended.

@Pro         [ No offense either and didn't take it as an offense ]


I don't need to google your post; It's my sub area of study and I'm also an engineer in training with an SAE licence.  Extensive simulations and structural analysis integrated with kinematics.  Multiphysics to some core.  I design/innovate and not fix.  So, vehicular engine technology is far trivial with respect to what I do.  Your post is mixed up and that is why I commented.  The OHC and DOHC just wasn't logical and your conclusion wrt to performance is infinitely off.

Una too much book sef, sotay engineer wey neva qualify dey halla for bragging rights too. . Chei----book ohhhh!!!

Me kwanu, professional vulcanizer------Ajangbandi no go see beta tire without me.

Abeg helep the bobo if u sabi, if u no sabi make we hear word jare.

@Papa

What's happening?!

Pro's info is partly correct and I queried it.

An Engineer in Training is an entry level engineer working under the supervision of an engineer.  It's termed EIT i.e. entry level engineer.  You are not an engineer till after 5 to 8 years in practice.  I did help your the fellow that requested the information.  I rebuilt a 90 degrees vblock engine two years back so it isn't books when I talk about engines and combustion.

My post before this to Pro012 ended in a form of cliffhanger 'cause the thread was getting off focus from it's initial post and didn't want grudges.

@IVVIE,
This is a four cylinder VTEC engine, looking closely at the pic, u will see the VTEC imprint on the engine though its not so clear.
I have same model of car, no long grammer.

toy boy:

@IVVIE,
This is a four cylinder VTEC engine, looking closely at the pic, u will see the VTEC imprint on the engine though its not so clear.
I have same model of car, no long grammer.

You may be right!