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IntaCepta

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Registered: 25th Mar 02
Location: Mill Hill East, Greater London
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30th May 03 at 18:12

yea i agree, u need an animation or something to illustrate it.

Lo-Ranger-w

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Registered: 12th May 02
Location: Milton Keynes
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30th May 03 at 18:13

Variable valve Timing and lift Electronic Control.

IntaCepta

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Registered: 25th Mar 02
Location: Mill Hill East, Greater London
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30th May 03 at 18:14

oh yea, do u know if this VTEC concept / idea is patented(sp?)??

can other manufactures adopt the same idea?

cos i often wondered why no one else has taken this idea, as it is a really effective design

Lo-Ranger-w

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Registered: 12th May 02
Location: Milton Keynes
User status: Offline

30th May 03 at 18:15

ok high cam and low cam.. when vtec kicks in it engages the high rpm lobes to work there for allowing the low rpm lobes to run as high rpm. look at link thats been posted.

Lo-Ranger-w

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Registered: 12th May 02
Location: Milton Keynes
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30th May 03 at 18:16

there is also Mivec.. which is similar thing.. from mitsubishi I believe.

Lo-Ranger-w

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Registered: 12th May 02
Location: Milton Keynes
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30th May 03 at 18:18

nope

RobHardyUK

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Registered: 11th May 03
Location: High Wycombe
User status: Offline

30th May 03 at 20:36

quote:
Originally posted by 16vmarc
8 cylinders in a v formation naturally aspirated.

doesnt have to be normally aspirated!!!

SVM 286

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Registered: 13th Feb 05
Location: pain
User status: Offline

2nd Mar 06 at 14:12

quote:
Originally posted by SRi_Lad

quote:
Originally posted by 16vmarc
wot dont u understand abt v8s?

What is a V8? Is it the way the engine is laid out etc, what is the difference between a normal engine and a V8?

A V8 is a normal engine.

SVM 286

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Registered: 13th Feb 05
Location: pain
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2nd Mar 06 at 14:13

quote:
Originally posted by Marc
8 cylinders in a v formation naturally aspirated.

Not if it's turbocharged or supercharged.

SVM 286

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Registered: 13th Feb 05
Location: pain
User status: Offline

2nd Mar 06 at 14:13

quote:
Originally posted by Nismo

quote:
Originally posted by Cosmo
is there any decent places on the net you can read up about engines, etc??

yesh there is Click Here

SVM 286

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Registered: 13th Feb 05
Location: pain
User status: Offline

2nd Mar 06 at 14:17

quote:
Originally posted by SRi_Lad
Cheers guys, what about VTEC?

Also I take it you can add forced induction onto V8s etc!

Also are Merc kompressors supercharged engines?

1) Variable valve timing - there are various systems utilised by different manufacturers, but the basic jist is that valve lift and/or duration of opening time are increased at higher revs to allow more fuel/air mixture in to the combustion chamber to promote even higher revving and greater power and torque production.

2) Yes.

3) Yes.

mwg

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Registered: 19th Feb 04
Location: South Lakes
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2nd Mar 06 at 14:18

thread digger

SVM 286

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Registered: 13th Feb 05
Location: pain
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2nd Mar 06 at 14:21

quote:
Originally posted by Matty G
thread digger

Sorry Matt, didn't realise.

Clicked on this one by accident without thinking.

It was at the bottom of the page I was reading in related threads.

It looked interesting and I neglected to check how old it was.

Sorry.

Cybermonkey

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Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline

2nd Mar 06 at 14:22

seems you apologised as i posted

[Edited on 02-03-2006 by Cybermonkey]

SVM 286

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Registered: 13th Feb 05
Location: pain
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2nd Mar 06 at 14:23

Sorry Monkey - my bad.

Didn't even spot the date.

'tis nearly 3 sodding years old.

SVM 286

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Registered: 13th Feb 05
Location: pain
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2nd Mar 06 at 14:24

bradfincham

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Registered: 20th Sep 02
Location: East Of England Drives: Clio 172
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2nd Mar 06 at 16:01

SVM - well pointed about the vtec its what i was going to put

all these people that say thats when the 2nd cam comes in, or it comes on cam, or the ecotech kicks in

its all bollox

cars runs 16 valves and the 2 camshafts all the time

the reason why in say a corsa at 4.5k revs it feels a bit faster or sounds louder is that everything is running at optimim performance
so the air/fuel mixture is right etc

Tom

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Registered: 3rd Apr 02
Location: Wirral, Merseyside
User status: Offline

2nd Mar 06 at 16:02

It's just the profile of the cam init, but something to do with oil pressure

awaits getting shot down

whitter45

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Registered: 15th Nov 02
Location: Norton
User status: Offline

2nd Mar 06 at 16:51

VTEC does not use two camshafts

It uses actuators that engage at a given rev range and make the cam have a high lift profile

In effect the inlet is open for longer thus gives more power

I had a video of it somewhere

Corsa_Sri_93

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Registered: 25th Jun 02
Location: Bitchin' Hitchin
User status: Offline

2nd Mar 06 at 17:13

I have a 4th gen jap import Honda Prelude 2.2 VTEC and it's sooooo good. Easily the best car i've driven.

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