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View Results: What is your Favorite BumpStick?
I have a 296, no reason to have any other 4 26.67%
I have a 308, and It's a kinda MAGIC! 2 13.33%
I have a 320 SYMMETRIC, Love it! 1 6.67%
I have a 320 ASSYMETRIC (IE Siebenrock, MI, et al), It's the Shiznit! 4 26.67%
I have a 324, It's the Cat's Meow! 0 0%
I have a 330, why would I want anything else! 0 0%
I have a 332, I am in Nirvana! 0 0%
I have a 336, It's the Bee's Knees! 5 33.33%
I have a 340, and it's the Bomb! 0 0%
I have a 344, and it's a Stairway to Heaven! 0 0%
Multiple Choice Poll. Voters: 15. You may not vote on this poll

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Old 04-13-2013, 08:55 PM   #16
Les_Garten OP
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Old 04-13-2013, 09:16 PM   #17
Lornce
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[QUOTE=Les_Garten;21180672]
Quote:
Originally Posted by Lornce View Post
I put this Andrews cam in my GSPD with good results. It's either a #2 or #3, can't recall exactly. The paperwork is burried somewhere in the basement of my "other place".





Thanx! Is the Andrews on the Right in the PIC?
Yes. It's got more lift and greater duration, though it's hard to tell until you realise it has a much smaller base circle than the stock 308 cam on the left.
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Old 04-14-2013, 01:54 AM   #18
chasbmw
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Baseline dyno run

Baseline dyno run on a Slightly modified R100/7. The 2 lines show the difference between standard silencers and a set of Jim Cray's.

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Old 04-14-2013, 02:00 AM   #19
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Base run dyno run on r90/6, almost standard with high compression pistons. This bike has been fitted with 320 cam from motoren Israel, comparison dyno run will be made when engine run in.

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Old 04-14-2013, 02:07 AM   #20
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Another earlier Jim Cray dyno showing the results of his standard stage 1 tuning package on a euro 82 RS engine.

This does not include camshaft changes, just porting, dual plugging, induction and squish band work. Note the very much fatter torque curve.




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Old 04-14-2013, 02:10 AM   #21
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Seibenrock 1070 kit dyno runs, red at 26 degrees, blue at 28 degrees, dells, Seibenrock assymetrical cam, 40 mm straight through Jim Cray silencer, ported dual plugged, run taken after only 1200 miles
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Old 04-14-2013, 02:14 AM   #22
ME 109
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I wouldn't have a clue what cam I have. It is stock, as far as I know.
It doesn't matter.
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Old 04-14-2013, 03:15 AM   #23
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I wouldn't have a clue what cam I have. It is stock, as far as I know.
It doesn't matter.
Edit, I forgot to vote so I went to the polling booth but I couldn't see a 'I wouldn't have a' box?
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Old 04-14-2013, 09:14 AM   #24
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Be interesting to know what's causing such a dramatic drop in torque right through the middle of the useful rev range.

Any thoughts.

What are the lift/duration specs on the "asymetrical" cam.


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Seibenrock 1070 kit dyno runs, red at 26 degrees, blue at 28 degrees, dells, Seibenrock assymetrical cam, 40 mm straight through Jim Cray silencer, ported dual plugged, run taken after only 1200 miles
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Old 04-14-2013, 11:32 AM   #25
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Old 04-14-2013, 11:34 AM   #26
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Old 04-14-2013, 12:06 PM   #27
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Originally Posted by Les_Garten View Post
Hey CHASBMW, thanx for the graphs. On some of the GS's, that Torque dip was cured with exhaust changes. Has Jim Cray mentioned why this occurs on non GS's? Basically, what is the fix?

Is your 320 the Symmetric or Asymmetric version?
Les, my 1070 bike has a single crossover exhaust, with a proper 40mm diameter, this might have something to do with the dip, you can feel it on the 1070 bike, but then coming out of that dip is very nice. The 1070 has the assymetrical cam as supplied by Seibenrock for the 1070 kits. I never raised the issue with Jim.

The R90/6 has the non assymetrical cam 320 cam and it will be interesting to see the results, especially as with it's current set up the torque curve is almost straight.
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Old 04-14-2013, 12:25 PM   #28
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Some General Material from my Cruisings

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Old 04-14-2013, 12:27 PM   #29
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Old 04-15-2013, 02:19 AM   #30
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Originally Posted by Les_Garten View Post
How do you like the Symmetrical 320 on the R90 compared to the 308 I assume you used to have in it?
I'm waiting to find out, bike should be running again this week, then after it is run in I will dyno test it on the same dyno as the base line test. This should give some idea of the changes that a cam swop can achieve.

Not definitive, but a better idea then "my bike with a XYZ cam revs like a MOFO and does 300 yard wheelies uphill in 4th gear"


The reason for using the 320 cam is that my R90/6 is one of the early small front seal engines and aftermarket Cam choice is limited to either the 320 or the 332. Rudi, one of the contributors to this forum said that he had had good experiences from this cam.
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