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Italian Championship uphill GR.5 vintage classic http://www.ducatittandf1.com/viewtopic.php?f=20&t=267 |
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Author: | graeme [ Fri Jul 01, 2011 4:03 am ] |
Post subject: | Re: Italian Championship uphill GR.5 vintage classic |
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 |
Author: | Eldert [ Fri Jul 01, 2011 4:23 am ] |
Post subject: | Re: Italian Championship uphill GR.5 vintage classic |
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 |
Author: | graeme [ Fri Jul 01, 2011 4:49 am ] |
Post subject: | Re: Italian Championship uphill GR.5 vintage classic |
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 |
Author: | Eldert [ Fri Jul 01, 2011 4:59 am ] | |||
Post subject: | Re: Italian Championship uphill GR.5 vintage classic | |||
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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Author: | graeme [ Fri Jul 01, 2011 5:19 am ] |
Post subject: | Re: Italian Championship uphill GR.5 vintage classic |
Author: | graeme [ Fri Jul 01, 2011 5:27 am ] |
Post subject: | Re: Italian Championship uphill GR.5 vintage classic |
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 |
Author: | Eldert [ Fri Jul 01, 2011 5:50 am ] |
Post subject: | Re: Italian Championship uphill GR.5 vintage classic |
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 |
Author: | Carlo [ Fri Jul 01, 2011 5:56 am ] | |||||
Post subject: | Re: Italian Championship uphill GR.5 vintage classic | |||||
Hello, I use the aluminum in silica and the income from a solid cylinder barrel, and then cover in NICASIL, up to a displacement of 498cc. 92mm piston. Stroke 75. Cubic capacity 518 cc:, piston 92mm, 78mm stroke, shaft drive shaft offset. Crankshaft, machined from solid, titanium connecting rods. Gass!!!!!!!!!!
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Author: | Carlo [ Fri Jul 01, 2011 6:01 am ] | ||
Post subject: | Re: Italian Championship uphill GR.5 vintage classic | ||
This is a good way to strengthen the left crankcase. RE GASSSS!!!!!!!!!!!!!!!!
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