Author Topic: Another CR750 win... (Read 14563 times)

turboguzzi · « **on:** October 22, 2012, 09:06:35 AM »

Yesterday at the bol d'or classic at magny cours

With "slow" guy, Guy Bertin at the helm in the 1960-1969 class

simon#42 · « **Reply #1 on:** October 22, 2012, 10:21:48 AM »

there are quite a few people who wish they where as slow as guy bertin !

Darvill Racing · « **Reply #2 on:** October 22, 2012, 01:12:07 PM »

Crikey, that's an RCB.... Now parts for my RSC are rare but parts for that bad boy.......!!!!!

Gutted we couldn't make it to the Bol this year as we chose the Manx instead, we are working on 2013 so fingers crossed.

Sam Green Racing · « **Reply #3 on:** October 22, 2012, 01:32:31 PM »

Quote from: Darvill Racing on October 22, 2012, 01:12:07 PM

Crikey, that's an RCB.... Now parts for my RSC are rare but parts for that bad boy.......!!!!!

I thought that when looking at where the genny should be, really is a bit special

Sam.

Leino · « **Reply #4 on:** October 22, 2012, 01:36:59 PM »

A friend of mine is working really really hard to make me the slowest road racer on the planet

Sam Green Racing · « **Reply #5 on:** October 22, 2012, 01:47:34 PM »

You're like me.....don't do corners

Leino · « **Reply #6 on:** October 22, 2012, 01:49:48 PM »

Quote from: Sam Green Racing on October 22, 2012, 01:47:34 PM

You're like me.....don't do corners

I'm gonna give it a go... perhaps trash Jarmo's Ducati

RickB · « **Reply #7 on:** October 22, 2012, 02:11:18 PM »

Ooo very nice.

If you don't mind me asking, what faring is that? I've never seen a quarter fairing on a CR bike before.

Sam Green Racing · « **Reply #8 on:** October 22, 2012, 02:27:46 PM »

It could be anything, it's what's underneath it that counts.

voxonda · « **Reply #9 on:** October 22, 2012, 02:47:33 PM »

Really hate to spoil the fun, but it is (just) a CR 750, but with the casings grinded from all the unnecessary parts, just like RSC did with the first RCB's. They used, almost, the same castings.
It is definitely a fast one with a very fast rider on board!

Picture of Guy before bike got his new colorscheme.

Sam Green Racing · « **Reply #10 on:** October 22, 2012, 03:04:05 PM »

Nice one Rob but it still looks like someone went to a lot of trouble on the crank end casting.

Sam.

turboguzzi · « **Reply #11 on:** October 22, 2012, 04:09:19 PM »

and yet, not the smartest thing in a fall.... just guess that Monsieur Bertin doesnt fall off too often, at least not on the left side

Pretty impressive the fact that they finished 5th overall out of 52 bikes, beating, well.... some 47 other bikes who were mostly much more modern dohcs/16V/etc. My friend Dario Tosolini finished just behind them on a Segale DOHC Honda prepared by his father Ettore.

http://www.ris-timing.be/~circuit//bolclassic/2012/2012_Bol_d_or_Classic_Bol_d_or_Classic_Manche_2cumul.pdf

simon#42 · « **Reply #12 on:** October 22, 2012, 04:46:43 PM »

i think the fact that it rained may have helped , my old mates steve boam and steve clark had a good ride to finish just behind that segale .

cb1100rb · « **Reply #13 on:** October 23, 2012, 02:04:38 AM »

Darvill Racing · « **Reply #14 on:** October 23, 2012, 11:33:20 AM »

Sooooo a SOHC can be in the mix hey.....
Hummmm
Therefore a quick engine with a Spondon frame, some mag wheels, some decent forks and shocks and some decent stopping power and it could be in with a chance with the right riders ....

Thoughts everyone (Rob V especially).

Regards,
A

voxonda · « **Reply #15 on:** October 23, 2012, 01:09:43 PM »

Always said a SOHC still can do the job. Again it is proven. Very important, even more than the engine, are the right riders. Saw it this season with a slightly underpowered engine against much stronger and faster engines, when both riders outgunned a lot of the youngsters by being able to keep the pace and carry, a lot, more speed thru corners.
Even not convinced that a non- CB frame is that much better although weight can be an issue.
This is my 'dream-bike' which, at some point, will be build and used.

This is a Dresda framed, 970cc very fast one. Only the frame will be OEM. And they survived and won 24 hour races.

Darvill Racing · « **Reply #16 on:** October 23, 2012, 01:29:28 PM »

I agree about the riders but also the frame helps, we ran a test some time ago with a braced OEM frame and compared to the Spondon frames we have and the Spondon frames were superior especially mid corner and more stable at speed.

It's got me thinking it really has......

Regards,
A

voxonda · « **Reply #17 on:** October 23, 2012, 01:51:33 PM »

OEM frame benefits a lot from longer swing and a bit more trail. And mount the engine the right way. But felt that there is nothing wrong with your Spondon in that area too.
I see it as a challenge to come up with the SOHC against the 4V, double nockers. Driveabilty is as good and low down even better, only real setback is pure outright power. IMHO

Darvill Racing · « **Reply #18 on:** October 23, 2012, 01:59:07 PM »

Yep I agree outright power is key (Those MotoBel boys are like lightning on the straights) and keeping in touch with them is where you want to be.

What sort of reliable HP do you think you can get from your planned engine Rob?

Regards,
A

Retro Rocket · « **Reply #19 on:** October 23, 2012, 02:14:23 PM »

Gday Alex, you may want to read the thread in the HIPO section on the cycleX race bike, it was blowing away DOHC race bikes quite easily, from memory, 115 reliable HP and extremely fast, altered angle on intake ports....

http://forums.sohc4.net/index.php?topic=108206.0

Mick

voxonda · « **Reply #20 on:** October 23, 2012, 02:17:53 PM »

The guys on the MotoBel Guzzi know how to corner......

And sure would like to know what engine they use???
Carry a lot of speed out of corners onto the straights too.
Thinking of maybe 100 rwhp, depending on engine size. Does not seem too much but need to keep it in one piece. Good streamline would help too. Look at this bike as example:

Cheers, Rob

Darvill Racing · « **Reply #21 on:** October 23, 2012, 02:19:32 PM »

115 reliable......
That's top 10 material easily (talking about the Bol d'Or)....

Research time me thinks......

Darvill Racing · « **Reply #22 on:** October 23, 2012, 02:21:35 PM »

Where is this bike from Rob?
And I agree with your comments

voxonda · « **Reply #23 on:** October 23, 2012, 02:25:40 PM »

Bill Smith build two of these for himself and John Williams. CR750 kit-bikes with Bill Jakeman streamlines, MIRA tested for dealing with overheating back in '72. This one is from John and uses a Krober ignition, hence the 'bulb' on side of the fairing.

Darvill Racing · « **Reply #24 on:** October 23, 2012, 02:30:45 PM »

Thanks Rob,
Nice bike!

News:

Author Topic: Another CR750 win... (Read 14563 times)