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| lordmoonpie |
 Posted: Fri Aug 04, 2006 6:04 pm |
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Rookie
Joined: 04 Aug 2006
Posts: 4
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I've got a DOHC crank going into an SOHC engine for a CB750. I've sorted the primary drive, chain and tensioner but don't know what to do about the camchain sprocket or camchain tensioner. Presumably I have to use a DOHC camchain tensioner on the hy-vo camchain, but how do I fix it up in the SOHC engine?
Also, what donor bike can I get the correctly geared camshaft sprocket from?
Any ideas gratefully received - in fact the first detailed solution for both I'm prepared to send the poster a pair of screen sticker for their bike of their name or nickname!
Cheers
Simon  |
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| Satanic Mechanic |
| Posted: Sun Aug 06, 2006 8:24 pm |
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Moderator
Joined: 04 Sep 2005
Posts: 309
Location: Munich, Germany
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| The DOHC cam sprocket will at least have the correct number of teeth, but I have no idea how it will fit the SOHC cam. |
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| Satanic Mechanic |
| Posted: Sun Aug 13, 2006 5:05 pm |
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Moderator
Joined: 04 Sep 2005
Posts: 309
Location: Munich, Germany
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| The CB 400 N cam sprocket is supposed to fit the DOHC cam chain and the SOHC cam. |
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| lordmoonpie |
| Posted: Mon Jan 07, 2008 9:50 pm |
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Rookie
Joined: 04 Aug 2006
Posts: 4
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Satanic Mechanic wrote: The CB 400 N cam sprocket is supposed to fit the DOHC cam chain and the SOHC cam.
Well it's the right profile at the teeth end of things but doesn't have the right cutouts for the megacycle or the right thickness to clear the cam tunnel....but what it did do was allow me to take that plus a good SOHC cam sprocket and get one made that was the hybrid son of the two!
So - just the cambox cover to fit now which doesn't fit on a hy-vo camchain in a SOHC head...otherwise I'm there, DOHC crank in an SOHC engine....on the bench  |
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| Satanic Mechanic |
| Posted: Tue Jan 08, 2008 9:06 am |
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Moderator
Joined: 04 Sep 2005
Posts: 309
Location: Munich, Germany
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Good to hear you are making good progress!
What are you using for a primary chain tensioner? I am somewhat stuck there with my turbo / auto crank project, and suggestions?
Cheers, |
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| lordmoonpie |
| Posted: Tue Jan 08, 2008 7:58 pm |
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Rookie
Joined: 04 Aug 2006
Posts: 4
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Ah, tensioner is not so easy I'm afraid. Front tensioner is a CB200N which is obsolete so you'll have to search for that. For the back tensioner I followed what I've done previously in my CB350 race bike and made a slipper tensioner. Basically you get two pieces of 2mm stainless steel and a block of 16mm thick teflon. Shape them so you sandwich the teflon in the steel and shape to the same bow type profile as the original tensioner. Cut a hole through the base to take the pin that goes into the crankcase mouth and you have a slipper tensioner.
The only issue I can see is that with the hy-vo chain it doesn't fit as well lengthways between crank and cam so you either have it way too tight or too slack so the tensioner is doing a lot of work. Worth a try though 
When I get it all finished and write the build up I'll post a link to it all so you can see for yourself. |
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