Feb 13, 2015, 01:41 PM
Last edit by: IB Advertising
Everything Breakout! Find out everything you need to know! Some topics include:
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• And much more!
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• Customizing you bike
• Seats
• Risers
• And much more!
For more information check out these threads:More Threads
The Everything Breakout Thread
Ultimate HDF Member
Joined: Apr 2016
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From: Sulphur La.
Yes mine is the same way, but it would be nice to have that slack so I don't have to unclamp it from the frame.
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Joined: Mar 2016
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From: Mesa, AZ
-WRM
Outstanding HDF Member
Joined: Jun 2014
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From: 90210
Hello everyone hope you are all getting some good summer riding time in.
I have put quite a few miles on the new 57H cams, tuned it in very well with the PV TT system. All in all it runs great except it is a bit weaker down low than I would like and I notice it more now with 2-up riding. I would attribute this to the lower static and dynamic compression of thee cams- it is 181CCP with the 57H cams @ 38deg IVC and 9.04:1 dynamic comp.
Stock cams, compression ratio was higher at 187ccp (@ 30deg IVC) - dynamic comp was 9.30:1 - Although the 57H gives long duration and greater lift, the reduction in compression and later IVC event is taking more notice with my riding style (mostly town, a lot of stop / go).
So I have two choices to consider- Keep the 57h cams, pop the heads and run a thinner HG to raise comp - or - drop in a set of 48H cams (29deg IVC). Either will get me to 188CCP and 9.33:1 dynamic. Essentially back to stock comp levels but with better lift & duration. Actually with prices of the 48H cams so low, it looks like the cheapest option.
I have put quite a few miles on the new 57H cams, tuned it in very well with the PV TT system. All in all it runs great except it is a bit weaker down low than I would like and I notice it more now with 2-up riding. I would attribute this to the lower static and dynamic compression of thee cams- it is 181CCP with the 57H cams @ 38deg IVC and 9.04:1 dynamic comp.
Stock cams, compression ratio was higher at 187ccp (@ 30deg IVC) - dynamic comp was 9.30:1 - Although the 57H gives long duration and greater lift, the reduction in compression and later IVC event is taking more notice with my riding style (mostly town, a lot of stop / go).
So I have two choices to consider- Keep the 57h cams, pop the heads and run a thinner HG to raise comp - or - drop in a set of 48H cams (29deg IVC). Either will get me to 188CCP and 9.33:1 dynamic. Essentially back to stock comp levels but with better lift & duration. Actually with prices of the 48H cams so low, it looks like the cheapest option.
Last edited by LA_Dog; Sep 6, 2016 at 11:57 AM.
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Joined: Jul 2015
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From: SF Bay area
Hopefully one of the resident engine builders will chime in here...
You can try the Andrews 4 degree advance gear. From what I read it gives a bit of a compression bump, & moves the curve to the left a little.
Again, just what I've read.
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You can try the Andrews 4 degree advance gear. From what I read it gives a bit of a compression bump, & moves the curve to the left a little.
Again, just what I've read.
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Outstanding HDF Member
Joined: Jun 2014
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From: 90210
By getting to a 29 IVC I'll be on the cam at closer to 2k rpm and pulling up comps to a more optimal level. I'm also looking at the S&S 583 cams - IVC of 19 but supposed to have a usable range of 1500-5000 rpm and would give me about 9:53:1 dynamic comp. Interesting grind on them. I don't really need the ez-start gadgetry though.
Stellar HDF Member
Joined: Feb 2014
Posts: 2,710
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From: Lethbridge, Alberta Canada
. . . All in all it runs great except it is a bit weaker down low than I would like and I notice it more now with 2-up riding. I would attribute this to the lower static and dynamic compression of thee cams- it is 181CCP with the 57H cams @ 38deg IVC and 9.04:1 dynamic comp.
. . .
My Stage 4 Race kit (2014 version with the 259 cams) shows 210 on that test. Of course that kit I have included hi-compression pistons and CNC heads.
Jim G
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Joined: Jun 2014
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From: 90210
Wow! Are we talking about the compression reading you get when you turn the engine over with the starter with the compression releases disabled? 181?
My Stage 4 Race kit (2014 version with the 259 cams) shows 210 on that test. Of course that kit I have included hi-compression pistons and CNC heads.
Jim G
My Stage 4 Race kit (2014 version with the 259 cams) shows 210 on that test. Of course that kit I have included hi-compression pistons and CNC heads.
Jim G
Your stage IV setup will have higher comp by nature of its design, and ideally, the shop that installed it made sure the pistons were zero-deck and quench was optimized with a 30 thou head gasket. those things would all help raise your CR and CCP to the good levels you have.
Just ordered a set of 48H cams $200 shipped. I'll get them installed in the next couple of weeks and post back. 57h will be up for sale if anyone wants a very low mileage set - maybe 500 miles on them max.
Last edited by LA_Dog; Sep 6, 2016 at 01:58 PM. Reason: correction
Dog, interested to see what you thing of the 48s. I'm somewhere in the middle with a 33 intake close.
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Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
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From: 90210
Of course there are other things to consider in the cam specs besides IVC that will affect where the power comes on, like the LSA, but in my case from what I'm seeing it is a case of less compression and later IVC not equaling the "in town" riding result I want- I'm still not ready yet to throw a 107 kit at her and deal with extended downtime during nice weather. A set of cams I can toss in and tune in half a day, and it is less costly / time consuming that even pulling the heads for thinner head gasket swap.
Maybe this winter though on the 107 kit. I might be putting the Big Dog up for sale and then I'd want that nice grunt on the Breakout. ;p
Here is the info on the 48H cams:
Andrews 48H cams Product information:
Manufacturer #: 216348
Drag Specialties #: 0925-0598
Biker's Choice #: 49-4093
Fitment: 06 Dyna, 07-14 Twin Cam
• Broad tip cams for baggers with stock motors
• Max torque at low and mid RPMs
Timing-Open---Timing-Closed---@.053---Duration---Lift
Intake----13°----------29°--------------------222°---.548
Exhaust--43°----------15°--------------------238°---.548
Outstanding HDF Member
Joined: Jun 2014
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From: 90210
BTW I'm really not expecting a major diff with the 48H, just looking at recovering some slight but noticeable compression losses which I definitely feel when taking of from the light with a passenger. Nothing here is going to be a large difference until I move forward with further motor work. For example, the higher lift of the 48H is a tad bit of a waste with the restrictive stock heads, but hey it was a good deal on them and they have decent specs. It will be fun to see how the motor changes with the 48h cams installed and if my indications for improvement are correct.
Honestly the biggest and most significant performance difference to the bike (to date) has been the upgrade to 30/70 belt pulleys. I have yet to see any other mechanical mod give as much gain for the same (relatively) small $ of money spent
Honestly the biggest and most significant performance difference to the bike (to date) has been the upgrade to 30/70 belt pulleys. I have yet to see any other mechanical mod give as much gain for the same (relatively) small $ of money spent