Dear All,
This is Eddie (currently living away in a country where there are no Vincent, no special tools nor specialized machine shops..)
I was finally able to acquire a twin which I’ll be starting soon to slowly rebuilt (bike is in Europe, I’m not)
Being away I’m not in hurry, but I’m pushing to have it completed as soon as possible trying not too lose much time.
The machine is a 48 Rapide (acquisition object of a previous post: http://www.vincentownersclub.co.uk/...etermine-authenticity-and-value-of-1017-cases ) which I’m willing to rebuild to be used as much as possible once back in home. As it’s not a matching number, am not looking for a concourse rebuilt but for a reliable enjoyable bike.
I’ve already some ideas but I would like to get your expert advice and i'm sorry if some of the questions have already been treated in previous posts.
First of all, i'will be sending the cases (as were welded around the front primary sprocket) for wrapping check to Maughan.
I’ll also ask them to rebuild and balance the crank for me, and here the first question: piston compression which is the best one for road use and long engine life? 7.3 as per Shadow or 8 as per modern fuel allowance? More than 8 become too extreme?
My idea would be 8:1.
After the bottom end is done, to complete the lower engine part I would need to source a gearbox..again which is the best compromise for fast road use? Rapide or shadow first gear? There is really a difference? I was of couse thinking about shadow specs for the gear box. I’m not interested in a 5 speed type.
As my primary cover is already modified for accepting a multiplate clutch (separate clutch chamber has been cut away) I was thinking to stick with it instead of the original one. Any major inconvenience with that? Is it true that mutliplate clutch allows for quicker gear changing?
And what about the cams and timing chest? MKII or 105?? MKII are to extreme and reduce fuel mileage? 105 still good at all revs? Low torque granted? Top speed ok?
Idler and gears to be lightened with holes??
My idea is for the time being Gary Robinsons 105.. but open to suggestion..
Cylinder heads, I don’t have them, so again I’m pretty free here. I was thinking about Goddens complete heads (front and read, not two front) ported to take shadow specs carb 1 1/8.
For carbs? Again I’m not bind to originality, but just looking for good street performance and reliability so was thinking about a monoblock 389 series as per D shadows. Concentric would be better? Gardner or other are too extreme??
Last thing for this afternoon (more to follow..) magneto: Lucas or electronic BTH?? BTH is for now my choice and was also thinking about an Alton 12v generator.
Thanks to all,
Eddie
This is Eddie (currently living away in a country where there are no Vincent, no special tools nor specialized machine shops..)
I was finally able to acquire a twin which I’ll be starting soon to slowly rebuilt (bike is in Europe, I’m not)
Being away I’m not in hurry, but I’m pushing to have it completed as soon as possible trying not too lose much time.
The machine is a 48 Rapide (acquisition object of a previous post: http://www.vincentownersclub.co.uk/...etermine-authenticity-and-value-of-1017-cases ) which I’m willing to rebuild to be used as much as possible once back in home. As it’s not a matching number, am not looking for a concourse rebuilt but for a reliable enjoyable bike.
I’ve already some ideas but I would like to get your expert advice and i'm sorry if some of the questions have already been treated in previous posts.
First of all, i'will be sending the cases (as were welded around the front primary sprocket) for wrapping check to Maughan.
I’ll also ask them to rebuild and balance the crank for me, and here the first question: piston compression which is the best one for road use and long engine life? 7.3 as per Shadow or 8 as per modern fuel allowance? More than 8 become too extreme?
My idea would be 8:1.
After the bottom end is done, to complete the lower engine part I would need to source a gearbox..again which is the best compromise for fast road use? Rapide or shadow first gear? There is really a difference? I was of couse thinking about shadow specs for the gear box. I’m not interested in a 5 speed type.
As my primary cover is already modified for accepting a multiplate clutch (separate clutch chamber has been cut away) I was thinking to stick with it instead of the original one. Any major inconvenience with that? Is it true that mutliplate clutch allows for quicker gear changing?
And what about the cams and timing chest? MKII or 105?? MKII are to extreme and reduce fuel mileage? 105 still good at all revs? Low torque granted? Top speed ok?
Idler and gears to be lightened with holes??
My idea is for the time being Gary Robinsons 105.. but open to suggestion..
Cylinder heads, I don’t have them, so again I’m pretty free here. I was thinking about Goddens complete heads (front and read, not two front) ported to take shadow specs carb 1 1/8.
For carbs? Again I’m not bind to originality, but just looking for good street performance and reliability so was thinking about a monoblock 389 series as per D shadows. Concentric would be better? Gardner or other are too extreme??
Last thing for this afternoon (more to follow..) magneto: Lucas or electronic BTH?? BTH is for now my choice and was also thinking about an Alton 12v generator.
Thanks to all,
Eddie