Does Vtec really kick in?

[brainhulk]

my mitsubishi's mivec kicked in harder than vtec yo

 

[Pantoot]

Same bike, not my dyno, but...VTEC YO @ ~6800 rpm

 

[KIAman]

My kid's sippy cup just kicked in, YO!

 

[vshah]

srs question. honda's vtec was the first variable cam system, correct? are all the other automaker's licensing Honda's tech?

 

[KIAman]

srs question. honda's vtec was the first variable cam system, correct? are all the other automaker's licensing Honda's tech?

No, they found their own way to do it.

 

[Zenmervolt]

srs question. honda's vtec was the first variable cam system, correct? are all the other automaker's licensing Honda's tech?

It was the first to employ two separate cam profiles, yes.

Fiat had an experimental system in the 1960's, and GM flirted with some patents in the 1970's, but neither system employed two distinct cam profiles.

In 1980, Alfa Romeo used a mechanical cam phasing system in a couple of cars and this what the first use of variable timing in a production vehicle. Nissan introduced a cam phasing system with electronic control in 1987 I think, but again these didn't use two separate cam profiles.

KIA man is right that most companies have found ways to implement variable valve timing without needing to license other companies' patents.

ZV

 

[Demon-Xanth]

"Some versions of the Bristol Jupiter radial engine of the early 1920s incorporated variable valve timing gear, mainly to vary the inlet valve timing in connection with higher compression ratios.[2] The Lycoming R-7755 engine had a Variable Valve Timing system consisting of two cams that can be selected by the pilot. One for take off, pursuit and escape, the other for economical cruising." --from Wikipedia

(the latter an experimental aircraft flown 1944-1946)

Nissan also used VVT in the 1986 300ZX, three years before Honda's VTEC.

And here's a VVT setup on an 1886 steam engine

 

[Demon-Xanth]

double post

 

[reallyscrued]

According to Wikipedia (does that phrase annoy anyone else?) Honda first implemented VTEC in 1983 on their CBR400 bike.

Not to mention Nissan didn't introduce the Z32 body until 1989, the 1986 300zx still used the Z31 body style with no VVT.

And in that steam engine photo, you can clearly see the HONDA name stamped on the shaft.


And by the way, from inspiration of this thread, I am changing my license plate to:

 

[Zenmervolt]

According to Wikipedia (does that phrase annoy anyone else?) Honda first implemented VTEC in 1983 on their CBR400 bike.

The REV system in the CBR400 was quite nifty, but wasn't actually varying cam timing or lift. The engine operated on 2 valves/cylinder at low RPM and then switched to 4 valves/cylinder at high RPM. Nit picky perhaps, but the system didn't actually change either cam, it just brought a second one into play at high RPM.

Not to mention Nissan didn't introduce the Z32 body until 1989, the 1986 300zx still used the Z31 body style with no VVT.

The Z31 did get the NVCS setup in 1987 prior to the Z32 style. Possibly not in the US market, but the VG30DE was used in the Fairlady Z in '87.

And in that steam engine photo, you can clearly see the HONDA name stamped on the shaft.

I think you're right. :awe:

ZV

 

[vshah]

am I blind? i can't see honda anywhere on that shaft

 

[Demon-Xanth]

am I blind? i can't see honda anywhere on that shaft

Need to buy some batteries?

 

[speedy2]

How/Why would honda be on it anyway. The Honda who founded the company wasn't even born back when that steam engine was built. lol

 

[vshah]

Need to buy some batteries?

don't understand this either

I think i will just leave this thread alone :hmm:

 

[Demon-Xanth]

don't understand this either

I think i will just leave this thread alone :hmm:

Your sarcasm meter isn't working.