www.CVOHARLEY.com

Please login or register.

Login with username, password and session length
Advanced search  

Author Topic: Cam TIming  (Read 1599 times)

0 Members and 1 Guest are viewing this topic.

Bhentz

  • Newbie
  • *
  • Offline Offline
  • Posts: 16
  • www.CVOHARLEY.com
    • TN

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?
Logged

*58Vette

  • Senior CVO Member
  • ****
  • Offline Offline
  • Posts: 285
    • VA


    • CVO1: 2011 FLHXSE2 Black Diamond w/Crimson Tag Graphics
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. 
Logged

HD Street Performance

  • Vendor
  • 2.5K CVO Member
  • *
  • Offline Offline
  • Posts: 3133
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
Logged

grc

  • 10K CVO Member
  • ****
  • Offline Offline
  • Posts: 14216
  • AKA Grouchy Old Fart
    • IN


    • CVO1: 2005 SEEG2
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
Logged
Jerry - 2005 Cherry SEEG  -  Member # 1155

H-D and me  -  a classic love / hate relationship.  Current score:  love 40, hate 50, bewildered 10.

HD Street Performance

  • Vendor
  • 2.5K CVO Member
  • *
  • Offline Offline
  • Posts: 3133
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.
Logged

FlaHeatWave

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 2208

    • CVO1: '01 FXDWG2 RED 103 6sp
    • CVO2: '05 FLHTCSE2 CHERRY
    • CVO3: '09 FLTRSE3 YELLOW 117/DD7
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...
Logged
"I've read dozens of books about heros and crooks, and learned much from both of their styles"

Fullsac Performance

  • Vendor
  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1768
  • Never ride with a Halfsac! Insist on Fullsac Perf!
    • AZ


    • CVO1: 2024 Road Glide
    • Fullsac Performance
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
Logged
Never argue with idiots. They will beat you with experience.

timo482

  • Elite CVO Member
  • *****
  • Offline Offline
  • Posts: 860
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?
Logged
 

Page created in 0.218 seconds with 21 queries.