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Author Topic: Cam TIming  (Read 1606 times)

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Bhentz

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Cam TIming
« on: December 29, 2016, 03:08:53 PM »
Cam Timing question? Anybody have any experience with, advise or opinion on advancing cam timing. I have a 2012 CVO Ultra with 10.5:1 pistons, SE 259 cam VH power duals and hi flow air cleaner and SE pro tuner. Dyno 115 Hp and 112 lb/ft. The power curve really takes off about 2800 rpm, I would like to move the torque lower in the rpm range (without buying another cam). I was thinking about advancing the cam timing. Thoughts?
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*58Vette

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Re: Cam TIming
« Reply #1 on: December 29, 2016, 04:44:01 PM »
4 degrees is only around 250 RPM, you might want to look into re-gearing. 
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HD Street Performance

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Re: Cam TIming
« Reply #2 on: December 29, 2016, 05:26:02 PM »
So intake closes earlier, good
Exhaust opens earlier, not so good.
The 259 shines at 11.0:1
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grc

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Re: Cam TIming
« Reply #3 on: December 29, 2016, 05:55:19 PM »

I don't think you can advance it far enough to turn that cam into a stump puller.  A little more compression might help, and a change to the overall gear ratio will also help.  But at some point you will need to look at the costs involved with those changes versus just finding a better cam that more closely matches your riding style.

JMHO - Jerry
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HD Street Performance

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Re: Cam TIming
« Reply #4 on: December 29, 2016, 11:41:37 PM »
Great advice there. The 259 is a lot like the old 257 but wider more EFI friendly LSA. The 257 was right at home at 11:1 also.
I doubt you actually have 10.5:1 also, probably less. Fluid checking the components and measuring the head gasket and deck heights will reveal the actual.
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FlaHeatWave

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Re: Cam TIming
« Reply #5 on: January 07, 2017, 01:55:59 PM »
Quote from: Bhentz on December 29, 2016, 03:08:53 PM
Cam Timing question? Anybody have any experience with, advise or opinion on advancing cam timing. I have a 2012 CVO Ultra with 10.5:1 pistons, SE 259 cam VH power duals and hi flow air cleaner and SE pro tuner. Dyno 115 Hp and 112 lb/ft. The power curve really takes off about 2800 rpm, I would like to move the torque lower in the rpm range (without buying another cam). I was thinking about advancing the cam timing. Thoughts?

'Had an the same set-up in the '09 for about 10k miles , was running RSD Slip-ons (1.75 Baffle)  my #s were 107 / 119, which are typical for the SE Stae III Kit, originally had a flat spot 2500-2700, more dyno time cured the flat spot... Pulled clean from down low, and really came on the cams at 2700 on out.

You didn't say what mufflers you have?? from your HP being higher than TQ with the 259s, guessing the baffles are larger???

You might go to 1.75 baffles (TQ come in sooner) and retune...

If you want to cruise at 2000 in top gear and not downshift to pass, then change cams...
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Fullsac Performance

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Re: Cam TIming
« Reply #6 on: January 08, 2017, 05:02:21 PM »
Quote from: FlaHeatWave on January 07, 2017, 01:55:59 PM
'Had an the same set-up in the '09 for about 10k miles , was running RSD Slip-ons (1.75 Baffle)  my #s were 107 / 119, which are typical for the SE Stae III Kit, originally had a flat spot 2500-2700, more dyno time cured the flat spot... Pulled clean from down low, and really came on the cams at 2700 on out.

You didn't say what mufflers you have?? from your HP being higher than TQ with the 259s, guessing the baffles are larger???

You might go to 1.75 baffles (TQ come in sooner) and retune...

If you want to cruise at 2000 in top gear and not downshift to pass, then change cams...

You will have good results by following this advise. I don't think you will get the results your after with the cam timing changes. I only say this after spending considerable time in a dyno room doing back to back runs searching for results while making cam timing changes.

Steve@fullsac.com
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timo482

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Re: Cam TIming
« Reply #7 on: January 08, 2017, 05:25:23 PM »
trying to run at 2000 rpm at full power is dubious in the first place...

should be at 3000 to be really getting on it.. the rpm curve is right at the very bottom in the crank wrecking range

having the power come on big at 2800 is really about the bottom of where you want the power to come on isn't it?
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