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Old 09-20-2004, 01:48   #1 (permalink)
Jim Mock You Rock
 
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Advancing cam timing and power..

Hi just wondering? I am getting 150 rwkw out of thewagon at 160 -180 km ph .How far would I typically advance the cam to bring the power band down say 500rpm?
Also does that mean my 150 rwkw will be less?
Does it also mean that I will have much bigger power down low?Any experiences appreciated..
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Old 09-20-2004, 06:01   #2 (permalink)
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Re: Advancing cam timing and power..

Anyone?
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Old 09-20-2004, 15:32   #3 (permalink)
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Re: Advancing cam timing and power..

The power output wont change, just when the power curve peaks at its highest.
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Old 09-20-2004, 16:35   #4 (permalink)
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Re: Advancing cam timing and power..

Mustangs right you will chnage the character of the cam but not really change the peak output much.

I have run my DEV3HL with 0.025'", 0.035" & 0.045" lift at the cam ATDC (not at the valve) and the peak power is all much the same. At 0.025" the idle is poor, the low end very doughy and the cam kicks in strongly at the BBM switchover 3800rpm peaks at 5300rpm and holds stronly to the limiter. At 0.045" the idle is good the low end good, the mid range strong with a linear build of power peaking at 5300rpm and slowly trailing off to the limiter. Best all round for me was 0.035". I have tried this a lot but its all seat of pants as I don't have a dyno to check it with. At 0.035" I am running a 15.6 sec 400 ET so its not bad for an Auto wagon.

Just to compare in case your interested because of my AU rocker ratio of 1.8:1 0.025" lift at the cam is 0.045" lift at the valve.
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Old 09-20-2004, 23:52   #5 (permalink)
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Re: Advancing cam timing and power..

Quote:
Originally Posted by MustangNicko
The power output wont change, just when the power curve peaks at its highest.
Will the power curve change through the range?Will it give more power lower?
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Old 09-21-2004, 00:26   #6 (permalink)
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Re: Advancing cam timing and power..

In a word yes.

I have you making less than a stocker at 2750rpm now so I think that can be improved.
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Old 09-21-2004, 05:06   #7 (permalink)
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Re: Advancing cam timing and power..

Quote:
Originally Posted by useless
Will the power curve change through the range?Will it give more power lower?
The power output wont change, just the torque curve will be brought back a bit at lower rpm
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Old 09-21-2004, 05:18   #8 (permalink)
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Re: Advancing cam timing and power..

Quote:
Originally Posted by MustangNicko
The power output wont change, just the torque curve will be brought back a bit at lower rpm
So ..ill get more grunt lower..this must be good right??
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Old 09-21-2004, 05:26   #9 (permalink)
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Re: Advancing cam timing and power..

Yeah if you want more down low torque for off the line stuff. Personally id love a PHAT kick in the bum from 3k upwards. Because my car is a manual, by the time its launched and taken off, id allready be at 2,500 so the cam will kick in nicely straight away. Low range torque is mainly good for autos.
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Old 09-21-2004, 06:36   #10 (permalink)
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Re: Advancing cam timing and power..

If I want to bring peak power down Say 150 rwks at 5000rpm to 4500 rpm ..how much must I advance it?
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