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teetee2
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Post subject: Big valves on early F1? Posted: Fri Dec 05, 2014 7:53 pm |
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Joined: Sun Oct 17, 2010 2:24 pm Posts: 30 Images: 4
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teetee2
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Post subject: Re: Big valves on early F1? Posted: Fri Dec 05, 2014 8:13 pm |
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Joined: Sun Oct 17, 2010 2:24 pm Posts: 30 Images: 4
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Is this where I'll need to go? http://www.ducatiphoenix.com/F1.htm"........ The heads have been seriously ported and mated to the 40 mm Dellorto pumpers with Malossi velocity stacks that barely fit between the frame rails. The carbs have no chokes; just ticklers. The spark plug holes have been filled up and new holes brought farther from center to get a higher compression piston in there. The plug size is reduced from 14 to 12mm. Valve sizes are 42/44 mm...."
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huit
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Post subject: Re: Big valves on early F1? Posted: Fri Dec 05, 2014 8:50 pm |
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Joined: Sat Oct 29, 2011 3:38 pm Posts: 798
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Cjsracing in Bristol, he can help you out. Paul
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teetee2
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Post subject: Re: Big valves on early F1? Posted: Fri Dec 05, 2014 11:11 pm |
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Joined: Sun Oct 17, 2010 2:24 pm Posts: 30 Images: 4
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Bristol is a bit far from Oz but thanks
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athleticroman
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Post subject: Re: Big valves on early F1? Posted: Sat Dec 06, 2014 1:49 am |
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Joined: Sun Nov 28, 2010 4:13 am Posts: 657 Images: 0 Location: Sydney, Australia
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I have a series 1 750 F1 also. It is currently with Ian Gowanloch in Adelong NSW having the same upgrade that you plan for your engine. Ian has all the parts on the shelf. If you are closer to Melbourne you can also try Bob Brown. There you have it, two of the world's top Pantah race engine builders on your door step!
Ian has quite a back log to get through so try Bob Brown - I understand that he is only semi retired and may enjoy a job like this.
Re engine cases cracking - if you can screw the throttle as hard as Marco Luccinelli then there is a chance you can crack the cases. If you don't ride that hard it won't be a problem.
Cheers, MikeA
_________________ Mike, Sydney Australia https://www.facebook.com/groups/HandHeldDyno
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athleticroman
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Post subject: Re: Big valves on early F1? Posted: Sat Dec 06, 2014 3:33 am |
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Joined: Sun Nov 28, 2010 4:13 am Posts: 657 Images: 0 Location: Sydney, Australia
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teetee2
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Post subject: Re: Big valves on early F1? Posted: Sat Dec 06, 2014 5:22 am |
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Joined: Sun Oct 17, 2010 2:24 pm Posts: 30 Images: 4
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Thanks Mike, I know of both Bob and Ian. In fact the engine in this bike is a Bob Brown 836cc engine similar to the Magee bike. The heads have had some work on the ports but it is still using the standard valve size and 36mm PHF's. The motor has heaps of grunt but runs out of puff at 7000 and I was hoping to give it a little more legs before the end of January when we go to the Island Classic to be thrashed by the P6 RC30s/OWO1s/GSXR1100s etc. However given the time and budget restrictions neither of those two are options. Instead we will do it ourselves, which is why I was curious if anyone had done something similar.
The plan at present is to insert a 12 mm spark plug and widen the inlet valve to 41mm. As the seats will have to be recessed I expect the valve stem will have to be shortened. Although I think the 41mm Ducati monster/ss valve is shorter than the 37. Then of course there is that lifter groove to line up.
I suspect changing the valve angle would also involve the creation of new rocker arms, so that wont be happening.
I have a set of TT2 cams I was thinking of installing as well in the attempt to get more speed.
cheers
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teetee2
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Post subject: Re: Big valves on early F1? Posted: Sat Dec 06, 2014 5:35 am |
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Joined: Sun Oct 17, 2010 2:24 pm Posts: 30 Images: 4
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PS Your right I'm no Marco Luccinelli, but it is on its second set of cases.
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athleticroman
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Post subject: Re: Big valves on early F1? Posted: Sat Dec 06, 2014 7:21 am |
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Joined: Sun Nov 28, 2010 4:13 am Posts: 657 Images: 0 Location: Sydney, Australia
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teetee2 wrote: PS Your right I'm no Marco Luccinelli, but it is on its second set of cases. Sounds like you are no slouch either! Good luck against the Jap bikes! Cheers,
_________________ Mike, Sydney Australia https://www.facebook.com/groups/HandHeldDyno
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teetee2
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Post subject: Re: Big valves on early F1? Posted: Sat Dec 06, 2014 8:37 am |
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Joined: Sun Oct 17, 2010 2:24 pm Posts: 30 Images: 4
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Very much the slouch Mike
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