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Author Topic: Interesting - Cam profiles  (Read 1297 times)

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Marks DTM Calib

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Interesting - Cam profiles
« on: 20 February 2009, 14:53:55 »
Did a quick measurement on the A and G cams out of a 3.0 V6.

The profiles are as follows:



You will note that the G cam has the same lift but has a longer duration!

Not much difference other than that!
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Gaffers

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Re: Interesting - Cam profiles
« Reply #1 on: 20 February 2009, 14:55:32 »
The question is how much of a difference that would make  :-/
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Marks DTM Calib

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Re: Interesting - Cam profiles
« Reply #2 on: 20 February 2009, 14:57:56 »
Quote
The question is how much of a difference that would make  :-/


Quite a bit on the inlet, much less so on the exhaust
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M0T0RVATE

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Re: Interesting - Cam profiles
« Reply #3 on: 20 February 2009, 15:00:58 »
Longer duration is better than more lift.
Too much overlap though will result in very 'lumpy' idle speed, and an 'unsociable' drive at low mph.

Colin

 :)
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Martin_1962

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Re: Interesting - Cam profiles
« Reply #4 on: 20 February 2009, 15:50:37 »
Quote
Did a quick measurement on the A and G cams out of a 3.0 V6.

The profiles are as follows:



You will note that the G cam has the same lift but has a longer duration!

Not much difference other than that!


2.6 cams now and then all 4 please
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Timbuk

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Re: Interesting - Cam profiles
« Reply #5 on: 20 February 2009, 16:29:14 »
Only interesting if i had a rather clue what that means :D :D and dont you lot pretend im the only one who hasnt got a clue ;D ;D
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Marks DTM Calib

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Re: Interesting - Cam profiles
« Reply #6 on: 20 February 2009, 16:33:17 »
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Only interesting if i had a rather clue what that means :D :D and dont you lot pretend im the only one who hasnt got a clue ;D ;D

Elementary, the G cams hold the valve open longer.....and hence more air can get in easier
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TheBoy

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Re: Interesting - Cam profiles
« Reply #7 on: 20 February 2009, 16:58:25 »
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Only interesting if i had a rather clue what that means :D :D and dont you lot pretend im the only one who hasnt got a clue ;D ;D
I consider it like necking my favourite nectar...  ...the longer and wider my gob is open, the more efficiently the glass is ready for the next....
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Grumpy old man

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Re: Interesting - Cam profiles
« Reply #8 on: 20 February 2009, 17:16:05 »
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Only interesting if i had a rather clue what that means :D :D and dont you lot pretend im the only one who hasnt got a clue ;D ;D

Fancy not understanding, tut, tut.

 :o
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Timbuk

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Re: Interesting - Cam profiles
« Reply #9 on: 20 February 2009, 17:22:39 »
Quote
Quote
Only interesting if i had a rather clue what that means :D :D and dont you lot pretend im the only one who hasnt got a clue ;D ;D

Fancy not understanding, tut, tut.

 :o

At least im not pretending i do ;D ;D
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Re: Interesting - Cam profiles
« Reply #10 on: 20 February 2009, 17:38:52 »
Quote
Quote
Quote
Only interesting if i had a rather clue what that means :D :D and dont you lot pretend im the only one who hasnt got a clue ;D ;D

Fancy not understanding, tut, tut.

 :o

At least im not pretending i do ;D ;D

It's quite obvious from the graph ::)
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HGV mechanic

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Re: Interesting - Cam profiles
« Reply #11 on: 20 February 2009, 17:58:28 »
vtec is the way forward best thing since sliced bread,, dont rate the vvt system tho
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