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Old 05-15-2005, 12:30 AM   #1
FordFromHell351
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Did you know?

Did you know that the Italians invented the VTEC system? I was reading on an Alfa Romeo web site.
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Old 05-15-2005, 03:32 AM   #2
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Quote:
Originally Posted by FordFromHell351
Did you know that the Italians invented the VTEC system? I was reading on an Alfa Romeo web site.

Are you sure? I thought it appeared first in the 1991 NSX.
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Old 05-15-2005, 04:01 AM   #3
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Nope, just 2 years before that Alfa Romeo developed it.
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Old 05-15-2005, 04:05 AM   #4
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Quote:
Originally Posted by FordFromHell351
Nope, just 2 years before that Alfa Romeo developed it.

can you link me?

And BTW = did you get my PM?
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Old 05-15-2005, 04:21 AM   #5
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I dont remember the web site, but Ill try to find it and if I do I will put it on here. I do know that the Alfa Romeo 164L and S use a VTEC system, check it out.
Yes I did, I guess I dont need that Lambo pic.
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Old 05-15-2005, 11:42 PM   #6
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I always thought that Honda created Vtec...back in 1989?

http://asia.vtec.net/article/d15b/
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Old 05-16-2005, 02:08 AM   #7
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Quote:
Originally Posted by Ghost
I always thought that Honda created Vtec...back in 1989?

http://asia.vtec.net/article/d15b/

I think he means variable valve systems.
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Old 05-16-2005, 08:54 AM   #8
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oh! lol...sorry bout that
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Old 05-16-2005, 08:56 AM   #9
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Quote:
Originally Posted by Ghost
I always thought that Honda created Vtec...back in 1989?

http://asia.vtec.net/article/d15b/

of course honda made vtech!
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Old 05-16-2005, 03:37 PM   #10
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Quote:
Originally Posted by CarEXPERT
of course honda made vtech!

actually, vtech is a child's toy meant for learning, available at most any merchandise store nowadays. VTEC is available in some Honda/Acura cars.
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Old 05-16-2005, 07:44 PM   #11
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Alfa made a variable timing system for the 2 liter in the 164. Honda made avariable cam profile system. three's a rather large differnce. One that I'ee gone over many times.

"The timing of the valve train is not fixed as in most present day engines, but can be adjusted by a patented device conceived and produced by Alfa Romeo, the timing variator.

This is an electro-hydraulic actuator keyed onto the gear that drives the camshaft acting on the intake valves. This actuator enables the camshaft to be shifted into two different angular positions and to modify the intake valve opening durations. Its operation is controlled by the electronic control box of the integrated ignition and fuel injection system.

Valve timing actuator logic is predetermined so that overlap - i.e. that fraction of the engine's operating cycle when both the exhaust and the intake valves are open simultaneously - is shorter at low revs and with lighter loads, and longer at higher engine speeds when extra power is required."

.....................................

Basically, the Alfa system is an improvement on the earlier VarioCam systems, where the cam timing in relation to the crank is adjusted on the fly (but only to TWO distinct positions), and then holds the vlaves open slightly longer. The VTEC system by Honda, didn't just vary the timing of the cam in relation to the crank, it had two separate cam lobe profiles on a single cam, switched back and forth through a simple hydraulic system.

Unlike the Alfa system, which is like advancing and retarding your stock camshaft in, say, a Mustang (advancing to get a touch more power at WOT, but retarding it again to get better idle), VTEC is like having someone swap out your stock cam for a Comp Cams unit on the fly just before the stock one stops making power. A fairly radical difference and something no one else EVER did. It didn't just change cam/valve timing, VTEC changes timing, duration, lift, overlap, and entire cam profile on the fly! Some versions even changed intake runner length to match the new rpm range on the fly (effectively swapping between a regular and high rise intake manifold when teh cam change happened).
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Last edited by ChrisV : 05-16-2005 at 07:47 PM.
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Old 05-17-2005, 10:41 PM   #12
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Im talking about variable valve timing.
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Old 05-18-2005, 04:43 PM   #13
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Quote:
Originally Posted by FordFromHell351
Im talking about variable valve timing.

You said, "Did you know that the Italians invented the VTEC system?" Variable valve timing is NOT VTEC. Changing the cam's timing in relation to the crank is considerably different than switching cam lobes to a completely new profile, which is what VTEC does. The Alfa version was a development of the earlier Porsche vario-cam system, which was really an interactive version of the old hotrodder tuning trick of degreeing the cam.
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Old 05-18-2005, 05:05 PM   #14
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i feel so bad for chrisv having to repeat himself almost on a daily basis nowadays......... maybe i should jump in and help out a bit sometimes..... chrisv, dont u ever get tired of having to repeat urself?
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Old 05-18-2005, 08:42 PM   #15
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There is a huge difference between a variable timing system and hondas Vtec system, there guy. Im pretty sure that every major car company has their own version of variable timing, ford has VCT, toyota has VVT,etc. But Honda is the only one (i believe) that actually completly changes cam lobes instead of just the timing.
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