Topic: Salt Racer CB 750 OZ style

[sohc boy]

...oh the money ..the money , dont go there

[johno]

Well the man is on the home run, cheers for the pics Mike.
He only has to give them a clean up and they are on their way to Lake Gairdner and full noise for 9 miles.

So boys , get your eyeballs glued onto the next few pics, there are some serious differences to a normally modified CB head, see if you can spot some of them its fun....just never seems to end 

[johno]

Note the stud holes, amongst other things.

[johno]

Increased the bottom floor distance, widened the port for volume, and got a serious downward shot at the back of the valve................cool hey

[johno]

That looks nice , absolutely fu#kin nice 

[johno]

The exhaust looks nice , nice high relief up past the guide.

Mike I will post some more pics when I get it if you dont mind , I think you have created something special mate.
I'm thinking of entering in the National art gallery 

Thank you Mike.

[ogsmakdade]

looks great, would love to see flow numbers on this vs. stock 

[bear]

Which way are you headed with the motor Johno.
Pete and I where talking about bring my Hy-Vo's down to Gairdner in March.
But I don't want step on your toes if your going to go big with yours.

Cheers,
Brian

[johno]

 Hi Bear,
seeing as this thread is dedicated to your legs and your a good honest man, I think I should have a crack at this waterbottle fair and square...750 cc heads up , best man wins.

BUT if I lose fair and square Bear I guarentee the following year all rules out the window and he will get the bird 

Mind you it will be a buzz just being there this year, first week of March there is a good chance the weather may be nice and it turns into a nice camping trip full of noise, toys and good company. 

When I'm asleep I start thinking about the logistics of getting evrything there and facilities and its just as challenging as building the bike.  Your used to it bear with a big chair and lots of travel to different states, your probably kinda gypsy man after all these years.

So I am looking forward to it no matter what happens, its the right time of the year and lots of noise...did I say I love noise, vote me in at the next elections, first thing I'll do is ban mufflers.
ciao johno

[Doctor_D]

Ya'know Johno,  I love this project and might just be looking for an escape next March - if you're needing crew.  I have Kiwi "friends" I've been meaning to visit, and could possibly combine the trips.

Keep me in mind if you're needing someone to do the dirty, thankless jobs.

[cbornotcb]

Dont leave in march,DLRA speedweek dates are,
Friday 28th February to Friday 7th March 2014
I have a fresh engine sitting on the bench, chock full of goodies, I hope your 750 can beat it Johno 
Tiny

[Sam Green Racing]

So you managed to get the pistons sorted Tiny?

Sam.

[cbornotcb]

So you managed to get the pistons sorted Tiny?

Sam.

Yeah mate, along with dealing with an engineering firm who couldn't use a micrometer, the block returned from its journey to Mildura with #2 & #3 bores .001" smaller than the pistons, not bigger than .

[Sam Green Racing]

They do look the dogs bollocks though.    

Sam.

[cbornotcb]

They look even better in here Sam



Sorry for the thread hyjack Johno (a certain waterbottle racer might have put me up to it )
 
Tiny

[Sam Green Racing]

 

[bear]

Hey Johno,

I could not quite understand the water bottle fixation you have developed lately.
But I'm with you now brother.
I was harassed and molested by a young bloke on a water bottle at the Southern Classic.
Stev Barnett is his name and the little bastard is fast.
The prick had the temerity to ride up around the outside of me at turn 1 after the start of our first race for the weekend.
OK, said I, no problem, I'll just blow by him up the back straight. 
Well! It just didn't happen.
I managed to claw up level with him as we hit the braking area and then the prick had the hide to out brake me by four bike lengths.
That set the tone for the rest of the weekend.
So I'm with you Johno, FCUK THE WATERBOTTLES!

Cheers,
Brian

[sohc boy]

oooooo..... s**t ...Brian ,sounds like he really got your blood going ..... right johno  we'll make it officially , DEATH TO ALL WATERBOTTLES WEEK OF SPEED

[johno]

Thats right Bear, they should stay in speedway sidecars where they belong and leave the rest of the world to us Honda dudes 


Tiny, engine is looking nice, where did you get your pistons coated,? did you get the tops ceramic as well ? How much $
Hows your tricky fuel system coming along ?, when all else fails get a half inch fuel line to carb and a petcock on the hose once your going flat out use the petcock to keep your dash lights in the green zone , only need one hand to steer anyway cos your going in a straight line.

Hi Doc D, listen if your wanting some adventure in your life I'm sure taking a couple of weeks out of your life to come here would make it happen. Just the contrast from lush NZ to Oz desert lake will be way different.
You would be more than welcome mate. If you can get your bum here the oz forum boys and myself would look after you while your here.   A week at the Salt Lake, followed by a few days Tuna fishing at Victor harbor to cool off and this years Aust Vintage Japanese motorcycle show on same time at Victor, then zoom of to NZ.............good plan.....D were game if you are D. 
cheers Johno

[Sam Green Racing]

Sounds like a plan.  Go for it Doc.

Sam.

[cbornotcb]

Tiny, engine is looking nice, where did you get your pistons coated,? did you get the tops ceramic as well ? How much $
Hows your tricky fuel system coming along ?

It looks even better all buttoned up mate (funny how that parts floggin' mongrel found his way into the dust proof storage tub)
Piston tops & bottoms, HPC hi performance coatings, Leongatha, for about $130 for the set (they nearly got lost again when I neglected to put stamps on their package when posting them, luckily a mate works at the PO )
We shall now refer to the "tricky fuel system" as the Mikholley alcohol dispensing system, or, THE KEG

A wise LSR man (Hadfield I think?) once made a comment to me (and many others) regarding individual LRS plans,
Take your estimated top speed, halve it, and add 5 years,
Take your race budget and multiply it by 5.
That should be an achievable plan.

..........................................Buffalo girls go 'round the outside...............................

[bear]

..........................................Buffalo girls go 'round the outside............................... ;

Hmmmmm..................it just never ends, Oh the humiliation of it all

[cbornotcb]

Don't worry Bear, there not real engines anyway, they don't count 
Tiny

[bear]

I know Tiny, it's just that I keep waking up in the middle of the night in a cold sweat with that horrible ding..ding ....ding ringing in my ears

Cheers,
Brian

[johno]

Now that things are starting to get serious the old self doubt is creeping in.

The part I'm having second thoughts about is the cam. ( remember this is 750cc)

I have a RC 315 , a Mega 125/75 and have been talking about a local Tighe cam and a Kenny H F.
My original selection of running the 125 / 75 was based on my software printout which clearly showed the 125 /75 was the best cam to 9,000 RPM ( as per above graph) with the best torque curve.

Putting it simply the more duration fed into the 750 specs the more HP at Higher RPM

On the bottom of a couple of graphs I wrote the cams and duration in order with the RC 315 having the most HP at !0,500 but an absolute horror dip in the HP and Torque curves below 9,000 RPM.  as opposed to the least HP but the flattest HP and torque curve of the 125/75. My dilema is as its an all or nothing world and a long time between drinks on the salt doI play safe and run the 125/75 or roll the dice and run the higher RPM and HP of the RC 315.

I think the risk is my inexperience on the salt with gearing and traction, it is likely I wont get it spot on and in that case the conservative 125/75 will get me a better speed than the RC 315 which would need the gearing to be absolutely spot on of it will return a slower speed if evan slightly off the pace.

Bloody dilemma  :     I wish someone else had run a 750 on the salt and could give some good sprocket size advice.  At this stage I am using the 750 gear ration spreadsheet on our forum to set it up for 155 MPH at 10,500 rpm with 10% tire slip ...........see , lots of guess work

What do you reckon boys, a nice speed to feel good about or all or nothing //////
johno