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Old 10-27-2010, 09:52 AM   #1 (permalink)
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Cycle-rama cams cr575 lift @ t.d.c

Does anyone out there have the specs on the Cycle-rama cr575 cams. Including lift @tdc.

thinking about going to one in my 103, but concerned about valve to valve clearance. Thats why i need lift at tdc.. Intake is 2.00"

What do you think.

Bill
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Old 10-27-2010, 11:22 AM   #2 (permalink)
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Good Cam. I use it a lot as a bolt-in.
Pretty tall TDC's by comparison. (Lot of advance)
IN TDC: .270 (TWO SEVEN ZERO)
EX: TDC .180 (ONE EIGHT ZERO)
INT 15/35 .575 LIFT 230 DUR 100 LC
EXH 49/07 .560LIFT 236 DUR 111LC
22 OVLP
105.5 LSA

HTH.
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Old 10-27-2010, 03:21 PM   #3 (permalink)
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what size valves are you runnin?? any clearance problems....270 DAMNNNN!!!
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Old 10-27-2010, 03:49 PM   #4 (permalink)
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Your heads are modified, check yours and see if you have a valve to valve issue or piston to valve
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Old 10-27-2010, 04:09 PM   #5 (permalink)
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Quote:
Originally Posted by Sir Fig View Post
what size valves are you runnin?? any clearance problems....270 DAMNNNN!!!
I use it a lot as a bolt-in. ie stock valve sizes. No problems on the OE 96's and 110's.



Check with your porter if he can set/sink valves to accommodate v to v. and v to p. and get the chamber sizes you need.
(v to p may need addl valve relief machining depending on pistons).
If not, choose another cam.
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Old 10-27-2010, 07:01 PM   #6 (permalink)
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cr575 cams

Just checked valve to valve clearance, intake already sunk, somewhat. Exhaust no good, only .170 with Intake at .260. I know that's .010 more than the intake lift at tdc.
Plenty of meat left on exhaust head, bout .100 head thickness, without touching the valve face. Seating surface is dead in the middle of the valve face. I may just take a little meat off the exhaust vave head edge at 45 degrees, should still have plenty of edge thickness left. Valves are Manley, very thick head edges. Dont really like sinking valves. A lot of blending to do, then have to cut the surface to get compression back up..more spring shims, grind the stem, etc.

What do you xperts say? bout .060 clearance at tdc lifts?

I am running a Wood TW7 now. Unbelievable torque at lower rpm. kind of runs out of steam if you want to play around any.

Thanks,
Bill

07 ultra classic
103" 10.5 to 1
S&S crank,
wiesco pistons, +5cc domes.
no compression releases
real pain to start after a hot soak
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Old 10-27-2010, 07:11 PM   #7 (permalink)
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Quote:
Originally Posted by Sir Fig View Post
Just checked valve to valve clearance, intake already sunk, somewhat. Exhaust no good, only .170 with Intake at .260. I know that's .010 more than the intake lift at tdc.
Plenty of meat left on exhaust head, bout .100 head thickness, without touching the valve face. Seating surface is dead in the middle of the valve face. I may just take a little meat off the exhaust vave head edge at 45 degrees, should still have plenty of edge thickness left. Valves are Manley, very thick head edges. Dont really like sinking valves. A lot of blending to do, then have to cut the surface to get compression back up..more spring shims, grind the stem, etc.

What do you xperts say? bout .060 clearance at tdc lifts?

I am running a Wood TW7 now. Unbelievable torque at lower rpm. kind of runs out of steam if you want to play around any.

Thanks,
Bill

07 ultra classic
103" 10.5 to 1
S&S crank,
wiesco pistons, +5cc domes.
no compression releases
real pain to start after a hot soak
I would prefer to see 100 thousands valve relief clearance, if you are swapping out Wood 7's to the Cyclerama to gain top end I feel you are wasting your time. The Cyclerama 575 is a great cam, quieter than the 7 but very comparable. I could send you a dyno sheet with the CR575 if you want.
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Old 10-27-2010, 09:47 PM   #8 (permalink)
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Herko, BVBOB and any others

I'm looking at the CR 575 as a bolt in for my 2011 SESG. Couple of questions:

Will this cam push the torque to the right? If so, how much?

Would changing the head gasket to a .030 be a good choice or leave it stock?

How would the CR 575 compare to the TMan 555 or Mackie 575?

Thanks

JW
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Old 10-27-2010, 10:25 PM   #9 (permalink)
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Quote:
Originally Posted by BD 110 View Post
Herko, BVBOB and any others

I'm looking at the CR 575 as a bolt in for my 2011 SESG. Couple of questions:

Will this cam push the torque to the right? If so, how much?

Would changing the head gasket to a .030 be a good choice or leave it stock?

How would the CR 575 compare to the TMan 555 or Mackie 575?

Thanks

JW
This is a sheet showing the before and after from a 2010 CVO Convertible, the only work done was the install of the Cyclerama cams and a Rhinehart 2 into 1 pipe with a TTS open loop tune.

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Donatell heads
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Welded crank



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Soon to be back on the road


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Old 10-28-2010, 12:30 AM   #10 (permalink)
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Quote:
Originally Posted by Herko View Post
Good Cam. I use it a lot as a bolt-in.
Pretty tall TDC's by comparison. (Lot of advance)
IN TDC: .270 (TWO SEVEN ZERO)
EX: TDC .180 (ONE EIGHT ZERO)
INT 15/35 .575 LIFT 230 DUR 100 LC
EXH 49/07 .560LIFT 236 DUR 111LC
22 OVLP
105.5 LSA

HTH.
Must be real some steep ramps.. For instance a SnS585 cam has an earlier intake open of 20 degrees, higher lift but the TDC value is only 0.186 in... The CR cam has 15 deg and only .575 lift..

The exhaust on the 585 closes at 20 after and has basically the same TDC lift at 0.179 yet there is 13 degrees close difference and 0.025 more lift on the 585.
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Old 10-28-2010, 06:58 AM   #11 (permalink)
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Quote:
Originally Posted by Bruce Woltz View Post
Must be real some steep ramps.. For instance a SnS585 cam has an earlier intake open of 20 degrees, higher lift but the TDC value is only 0.186 in... The CR cam has 15 deg and only .575 lift..

The exhaust on the 585 closes at 20 after and has basically the same TDC lift at 0.179 yet there is 13 degrees close difference and 0.025 more lift on the 585.
If they are steep ramps they have figured out how to achieve this without the typical noise, these cams are very quiet.
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Welded crank



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Old 10-28-2010, 07:30 AM   #12 (permalink)
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Quote:
Originally Posted by BVBOB View Post
If they are steep ramps they have figured out how to achieve this without the typical noise, these cams are very quiet.
Herko put a set in a friends 2010 CVO Street glide,made 120ish torque and no noise.
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Old 10-28-2010, 07:45 AM   #13 (permalink)
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Steep ramp that doesn't make noise, it's in the hydraulic intensity.
The high TDC is because they have ground in advance.
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Old 10-28-2010, 09:37 AM   #14 (permalink)
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Quote:
Originally Posted by nw_guy4_fun View Post
Steep ramp that doesn't make noise, it's in the hydraulic intensity.
The high TDC is because they have ground in advance.
hydraulic intensity Sounds like techno-babel..

You can see that there is some advance based on IO and EC but it sure seems like a lot because you have 2 points where you can draw a line between say .270 at tdc and 0.086 at 20 before TDC for the intake. Did cr find the secret to opening the closing the valves faster than with noise then everyone else? Interesting but still skeptical.. A lot of the cams get noise from the from the last 0.020 before the valve touches the seat.. A gentle set down is what helps.. SE cams are this way.. Gentle lift off might help also.. Seems to me that these cams would hard on motors with stock springs.

The slope for the CR575 would be

270-86
------- = 9.2 thou per degree
20

A Woods 6h would be

194 - 86
--------- = 5.4 thou per degree
20

585
186 - 86
-------- = 5.0
20

While opening the intake is not linear you've got tho know that the acceleration between those to points is quite a bit different..
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Old 10-28-2010, 10:11 AM   #15 (permalink)
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Techno babble huh
Well I guess you can take that up with Harvey Crane
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