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Old 09-08-2003, 01:34   #1 (permalink)
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Retarding and Advancing Timing

Hey Y'all Just got ahold of a Vernier adjustable Gear and I'm pretty confident of Installing etc but I keep getting mixed responses as to what I should be doing as to Retarding or Advancing. My Car pulls like a 15 y/o wanking at 3000rpm and I thought it was advancing the timing to bring the power in earlier. After talking to Bresciani they suggested I need to retard my timing. Any help......?
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Old 09-08-2003, 02:17   #2 (permalink)
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Re: Retarding and Advancing Timing

Retard it to increase top end power, advance it to increase bottom end power.

Rick.
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Old 09-08-2003, 02:41   #3 (permalink)
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As a guide, 4 degrees advance will bring the power range down by about 200rpm, so the torque you had at 3000rpm will now occur at around 2800rpm. Opposite is true for retarding the cam by 4 degrees.
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Old 09-08-2003, 04:54   #4 (permalink)
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Any Idea how safe I can retard/advance without knocking my rocker arms (mind u my gearing only allows 6 degrees)?
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Old 09-08-2003, 05:08   #5 (permalink)
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Generally upto +/-4 degrees is standard. 6 degrees might be okay, but depending on the cam, you could actually end up loosing power. There is only one way to find out I guess, just make sure to check pv clearance. It may be a good idea to talk to JMM (if thats the cam you are tuning) to see what they recon.
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Old 09-12-2003, 07:49   #6 (permalink)
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Re: Retarding and Advancing Timing

Quote:
Retard it to increase top end power, advance it to increase bottom end power.
You guys sure about this? From what I found retarding and advancing my cam timing, retarding it increased bottom end, advancing increased top end.

Oh yeah by the way, I don't think you can change cam gears without taking the head off.

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Old 09-12-2003, 08:13   #7 (permalink)
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Re: Re: Retarding and Advancing Timing

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Originally Posted by donuts2003
You guys sure about this? From what I found retarding and advancing my cam timing, retarding it increased bottom end, advancing increased top end.
Directly from Crane Cams: "Advancing the cam will shift the basic RPM range downward. Four degrees of advance (from the original position) will cause the power range to start approximately 200 RPM sooner. Retarding it this same amount will move the power upward approximately 200 RPM."
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Old 09-12-2003, 08:56   #8 (permalink)
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Re: Re: Retarding and Advancing Timing

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Originally Posted by donuts2003
You guys sure about this? From what I found retarding and advancing my cam timing, retarding it increased bottom end, advancing increased top end.

Oh yeah by the way, I don't think you can change cam gears without taking the head off.
YES, you can change without pulling head off, cos' i have done this...

retard it for bottom end, advance for top.... mine mad best power bout' 6-8deg retard -btw, you can lose or gain bout' 10-15rwkw from having it it in the right/wrong place, so experiment, or dyno tune it...

when mine was setup, it didn't have any affect on low end torque, whether adv/ret, it only affected the top end dramatically. i was surprised it could run the same low end regardless
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Old 09-12-2003, 09:00   #9 (permalink)
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Re: Retarding and Advancing Timing

sorry, i ****ed up, i meant retard for top, advance for bottom guys
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Old 09-13-2003, 07:32   #10 (permalink)
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Re: Retarding and Advancing Timing

Jah_Nix: you might be mixed up as to which way advancing and retarding is -

if you are standing in front of the motor with the rocker cover off, and you turn the cam X degrees clockwise in relation to the crank you are advancing it, counter clockwise is retarding.

is that how you understood it or did you have it the other way around?
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