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September 23rd, 2017, 06:55 AM   #21
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Mayyyybe it makes sense that a single 550-600cc cylinder emitting force in a BANG will need the same clutch spring as four 250cc cylinders delivering more power but more smoothly?
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September 23rd, 2017, 10:30 AM   #22
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Hmm you got a point.. 70hp in a single bang is probable worse than 4 x 50hp. Anyways, the clutch is put away for an unknown time. Then I will find out and share my findings.
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September 24th, 2017, 12:16 PM   #23
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Not sure what youre saying there my friend, but any pulse going through the system is reliant on the mass of it all. (flywheel crank and all)
Spec is for ex from 3000 rpm, which is just set from the specs of the build, make it a smooth ride. The amount of inertia would relay on that no?
This done right its just about mean torque to make the clutch bite, as the clutch now manages a steady force, not pulses.

Now the range wont cover the most lowest rpm, but theres no chance you can achieve max cylinder filling at that point either.
Any max tq and match springs, super simple

Were looking at 17% more here than a souped up 565, should do for an easy calc.
Id imagine the stock springs shimmed 1.4 mills will take it, just guessing
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Last edited by TomTom; September 24th, 2017 at 01:01 PM.
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September 24th, 2017, 02:29 PM   #24
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You are probably right. The suter clutch use a different spring system than stock so it is just a matter of testing the different springs until it works as intended.
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September 26th, 2017, 11:00 AM   #25
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Having a closer look at the head and found a problem on the left side intake rocker. The rod can be carefully polished up and turned 180 deg, but I'm afraid the rockerarm must be changed out don't you think? The damaged area is quite rough so if I polish it up the result will be out of spec..

Big Bores for 70 degrees-20170926_195402.jpgBig Bores for 70 degrees-20170926_195433.jpg

I was told the head came from a CZ team and they had done the job on the ports.

Big Bores for 70 degrees-20170926_202137.jpgBig Bores for 70 degrees-20170926_202109.jpg

Last edited by jon andersson; September 26th, 2017 at 11:29 AM.
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September 26th, 2017, 09:31 PM   #26
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I'd change the rocker. They aren't cheap but they are as insurance.

Interesting the different opinions on knife edging.
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October 4th, 2017, 06:30 AM   #27
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After a few emails back and forth with thumperracing it is time to pack everything up to be shipped across the pond. In lack of any interesting mechanical pictures I will spam with some exhilarating packing pictures..

Enough padding to protect it from DHL.. Shorter bolts with a plastic lid holds the cylinder in place.
Big Bores for 70 degrees-20171004_145929.jpgBig Bores for 70 degrees-20171004_151105.jpg

I also added my 450 cam to be reprofiled and two inner bushings so the crank can be transported in the case on the way home.
Big Bores for 70 degrees-20171004_145956.jpg

Ready to be sent.
Big Bores for 70 degrees-20171004_151839.jpg

To be continued.
Big Bores for 70 degrees-20171004_152128.jpg
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October 4th, 2017, 08:33 AM   #28
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I sincerely confirm my exhilaration!
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October 5th, 2017, 04:51 AM   #29
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Are you able to disclose what they charge to reprofile the cam?
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October 6th, 2017, 03:59 AM   #30
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I didn't ask this time as I asked them in 2014, and I assume it will be in the same pricerange. This is the answer I got then:

Our stage 4 cam for your motor runs $425. The cam from your 450 is fine for a core.

Thumper
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