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Eldert
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Post subject: Re: Italian Championship uphill GR.5 vintage classic Posted: Fri Jul 01, 2011 3:00 am |
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Joined: Sun Oct 17, 2010 3:25 am Posts: 54 Location: Netherlands
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Hi Graeme
i use 78 mm stroke and 90 mm bore . i made a new liner with 95 mm outside diam and 93.5 mm where the liner goes into the crankcase . liner is a modified Peugeot diesel engine item . about the only one with a collar big enough to suit a Ducati
i weld a plate into the l.h. crankcase and turn a sleeve for the bearing that also goes into the reinforcing plate
Eldert
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plate in crankcase 004_edited.jpg [ 189.39 KiB | Viewed 1686 times ]
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graeme
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Post subject: Re: Italian Championship uphill GR.5 vintage classic Posted: Fri Jul 01, 2011 4:03 am |
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Joined: Sun Nov 07, 2010 10:54 pm Posts: 537 Location: Brisbane
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Thank you Eldert, from what I can see from your picture these are pre 74 cases which had the 2 case bolts either side of the cylinder hole exposed when looking down into the case? Later 74 cases had these 2 bolts spaced wider so when looking down through the cylinder hole you can't see the bolts. I think the pre 74 cases also had 1 smaller main bearing. Is that the side you and Carlo have strengthened? And used a larger main bearing? Graeme
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Eldert
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Post subject: Re: Italian Championship uphill GR.5 vintage classic Posted: Fri Jul 01, 2011 4:23 am |
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Joined: Sun Oct 17, 2010 3:25 am Posts: 54 Location: Netherlands
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the smaller main bearing is on the r.h.crankcase . Ducati went to a bigger main bearing after 450 engine number 453509 . so i think that must have happened in late 70 / early 71
i have to slim down the case bolts in the middle in order to get the 93.5 mm liner in the case and put in the bolts before i put on the barrel
i like to use the very late type cases but they are hard to find so i use any case with the bigger r.h. bearing
Eldert
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graeme
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Post subject: Re: Italian Championship uphill GR.5 vintage classic Posted: Fri Jul 01, 2011 4:49 am |
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Joined: Sun Nov 07, 2010 10:54 pm Posts: 537 Location: Brisbane
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I've only ever had the late case bikes, all 462--- , with the bolts spaced 110mm centres. What do you do to get 78mm crank? Offset bore the crank pin? Graeme
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Eldert
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Post subject: Re: Italian Championship uphill GR.5 vintage classic Posted: Fri Jul 01, 2011 4:59 am |
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Joined: Sun Oct 17, 2010 3:25 am Posts: 54 Location: Netherlands
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offset bore the crankpin thats correct . i use a straight 34 mm bigendpin from a Yamaha and use a 145 mm Yamaha rod from a XT 500 . i use a Paso type piston with a 18 mm wristpin high up in the pistonskirt
later on we made a new crank with full circle flywheels to accept the Yamaha parts
Eldert
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78 mm crank.jpg [ 56.48 KiB | Viewed 1677 times ]
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78 mm crank 2.jpg [ 29.09 KiB | Viewed 1679 times ]
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graeme
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Post subject: Re: Italian Championship uphill GR.5 vintage classic Posted: Fri Jul 01, 2011 5:19 am |
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Joined: Sun Nov 07, 2010 10:54 pm Posts: 537 Location: Brisbane
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graeme
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Post subject: Re: Italian Championship uphill GR.5 vintage classic Posted: Fri Jul 01, 2011 5:27 am |
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Joined: Sun Nov 07, 2010 10:54 pm Posts: 537 Location: Brisbane
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I used a Honda 500XL rod with similar big and little end dimensions, it was 1mm longer than a standard rod, but this is a road bike. The singles here are in another class. I have many more questions,,,,,,,, Graeme
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Eldert
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Post subject: Re: Italian Championship uphill GR.5 vintage classic Posted: Fri Jul 01, 2011 5:50 am |
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Joined: Sun Oct 17, 2010 3:25 am Posts: 54 Location: Netherlands
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the old 79/80 Honda XL use the same 34 / 42 mm bigendbearing . lenght is 141 mm . the only thing is the small end is 21 mm so you have to make a bushing and use a piston with a 20 mm wristpin . Prox still sells these rodkits .
i use this rod in my short stroke 6 speed 350 Ducati
Eldert
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Carlo
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Post subject: Re: Italian Championship uphill GR.5 vintage classic Posted: Fri Jul 01, 2011 5:56 am |
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Joined: Thu Oct 28, 2010 4:44 am Posts: 1790 Images: 7
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Carlo
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Post subject: Re: Italian Championship uphill GR.5 vintage classic Posted: Fri Jul 01, 2011 6:01 am |
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Joined: Thu Oct 28, 2010 4:44 am Posts: 1790 Images: 7
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This is a good way to strengthen the left crankcase.
RE GASSSS!!!!!!!!!!!!!!!!
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immagine 247.JPG [ 148.51 KiB | Viewed 1671 times ]
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