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My Track bike project

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Beresford
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Re: My Track bike project

Post by Beresford on Sun 07 May 2017, 8:45 pm

It's just that a bellmouth of some sort is necessary for non-turbulent flow into the carb venturi. Also the length of the tract from inlet valve head to bellmouth lip is somewhat critical for your target rev range.
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ANDYC
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Re: My Track bike project

Post by ANDYC on Sun 07 May 2017, 9:09 pm

The adapter acts like a venturi, it's just more stable to clamp the filters to. A shorter venturi is better for higher revs.
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ANDYC
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Re: My Track bike project

Post by ANDYC on Thu 18 May 2017, 4:34 pm

Headway is being made, slowly but nevertheless Very Happy 
One of the filter adapters arrived, the other one has to come from America.


The carbs are now linked together and have a common operating rod. I wanted to keep the profile of the carbs as low as possible to give me clearance for the underside of the fuel tank. Hence the cable linkage is at the side where I have plenty of clearance.

On to the exhaust side now. As they say what goes in has to come out, so I have gone for large bore header pipes which will be held on to the head with springs rather than the conventional stud/bolt/flange method.
For this reason I had to machine a pair of spigots that do bolt onto the head (but they will stay fixed there) to locate the headers.
They were turned and bored out of 75mm solid steel bar. The last picture has a piece of the pipe that will be used to make the 2-1 system. It was handy to have a spare cylinder head to test fit them to.



Not sure what finish to put on the finished headers yet, I probably will leave such decisions until I can see it actually on the bike.
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russellj
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Re: My Track bike project

Post by russellj on Sun 16 Jul 2017, 5:27 pm

dear Andy,I have been reading track bike project article,fantastic reading,you say you break bikes now!I would love to speak to you,my contact no is 0785 800 1995,I live at Carlisle its a shame I am 300mls up the road from you!
Hope to hear from you,
Kind regards,
Russell Jones.
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ANDYC
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Re: My Track bike project

Post by ANDYC on Mon 25 Sep 2017, 12:53 pm

I haven't been able to do much recently due to time constraints etc, but I did manage to convert a lump of billet aluminium into a manual cam chain tensioner yesterday afternoon.
It's not completely finished yet as I'm waiting for the steel thread insert (m10 x 1.25) to finish the thread to the correct size, and I may or may not finish the shape to the same lines as the original.




I think the exhaust will be the next stage to tackle.
I do have a set of 74mm Wiseco pistons on their way to me from America along with a set of forged con rods.
They may be for a later stage in the project development, I'm just quite keen to get it up and running now.
I would prefer it to be functional rather than in it's present ornamental state Shocked
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ANDYC
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Re: My Track bike project

Post by ANDYC on Tue 24 Oct 2017, 8:16 pm

Just made up a blanking plug to seal off the opening for the standard water pump as I plan to use an electric pump.
The 74mm wiseco pistons arrived all well and good, new rings are also on their way from the states.
It doesn't seem like much progress but it's progress none the less.
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Beresford
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Re: My Track bike project

Post by Beresford on Tue 24 Oct 2017, 8:31 pm

The electric pump is an intriguing idea. What make will you be using? It will be interesting to see your installation.
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tt fan
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Re: My Track bike project

Post by tt fan on Sun 21 Jan 2018, 1:17 pm

Fascinating read, i keep looking in here.
Any more progress Andy?
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ANDYC
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Re: My Track bike project

Post by ANDYC on Sun 21 Jan 2018, 2:16 pm

At present the bike is away having an exhaust specially built for it. I'm looking forward to getting it back in a week or so.
I haven't made much more progress with it due to a number of things, but until the exhaust was built I couldn't decide on which fairing to use. Which meant that I couldn't decide on which clocks to use, which in turn delays me building the loom. You get the picture, one thing leads to another.
The cylinders were bored to 74mm (+1mm) and I'm ready to build the engine now, all I need is time to do it which seems to be elusive at the moment.
This afternoon I'm modifying the carb linkages to make syncronising them easier, and also adjusting the accelerator pumps stroke.
I have been looking into a big valve conversion and have sourced some stainless steel one piece custom built valves that are +1mm, not cheap especially once you have to re cut the valve seats and while I'm at it I may as well replace the valve guides for shorter ones to allow for more valve lift.
I may leave that until the engine has been tested on standard sizes so I have a comparison figure to see what the difference is and is it worth it?
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ANDYC
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Re: My Track bike project

Post by ANDYC on Sat 10 Feb 2018, 6:16 pm

Just a bit of an update,
I now have the bike back with new exhaust, built just how I wanted it.
Even down to the positioning of the oxygen (lambda) sensor.
That's a refreshing change as normally if I wanted something done to my spec I have to build it myself.





Now I can get on with the rest of it.
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davecb5002
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Re: My Track bike project

Post by davecb5002 on Sat 10 Feb 2018, 7:14 pm

That looks very smart and profesional Smile
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ANDYC
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Re: My Track bike project

Post by ANDYC on Sat 10 Feb 2018, 7:30 pm

The guys that built it do race exhausts for a living.  Up close it's a work of art, ok it's not polished but that wasn't what I wanted anyway .
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tt fan
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Re: My Track bike project

Post by tt fan on Sun 11 Feb 2018, 2:19 am

That's looking great.
Very neat bit of tig.
Can you tell us much about the frame?
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ANDYC
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Re: My Track bike project

Post by ANDYC on Sun 11 Feb 2018, 8:06 am

The frame is from an nc29. The standard frame was very restrictìve regarding the carb set up and heavier too.
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ZekeVal
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Re: My Track bike project

Post by ZekeVal on Mon 12 Feb 2018, 9:43 am

That header-pipe looks sweet!!
Hope she runs soon.
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ANDYC
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Re: My Track bike project

Post by ANDYC on Mon 12 Feb 2018, 10:38 am

I wasn't sure if I had taken the headers out too wide at first. It was necessary to clear the oil cooler, but I'm happy with the outcome now I can see it in the metal.
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ANDYC
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Re: My Track bike project

Post by ANDYC on Sun 25 Feb 2018, 2:03 pm

Time for a bit of an update,
the rear wheel is now a 5" rim from a cbr600f3 as it improved the profile of the tyre a lot.
What did suprise me is that this set-up is only a few ounces heavier than the nc29 set-up.
I'll be making alloy spacers to replace the standard steel ones, including the internal one for the bearings. Once done the rear wheel/ brake and suspension can be considered as done.

This is now waiting for collection after powder coating, along with the front calipers that I decided were letting the show down by showing their age.
The calipers will be rebuilt on their return and apart from servicing the forks that part of the front end will be done.

The seat unit is now a Honda rsw250 unit, it looks much better than the nc29 one that I had on it previously.
The tank will be a plastic one based on a cbr600rr one that I'm presently working on, it will have a bottom welded and bonded into it to provide clearance and an epoxy lining as an extra safeguard against leaks.
The fairing I'm still not sure of, the tyga RCV211 style one was my favourite choice but at £800 it was more than I wanted to shell out at the moment. Especially as I wasn't sure how the heat from the downpipes may affect it. I have ordered a top race fairing to fit a cbr600rr3/4(a fifth of the price of the tyga one) and I'll see how that looks and fits in with the rest of the bike. I quite like the idea of not bothering with a bellypan so that the engine is visible. What do you guys think?

The carbs are slowly taking shape, It has taken 10 months to get them from Keihin in California as they kept sending the wrong ones. However I now have two matching filter adapters and can progress with the rest of it. The next step is to machine two separate operating spindles rather than one common one and connect them with a more conventional synchronizing system like the one on the standard cb500 carbs, to simplify balancing the carbs.

Not sure if anyone noticed on the last pictures but I've decided that it could be benefical for me to run an oil/water cooler due to the extra power and higher revs that I'm looking for. This was from an nc29 that I just happened to be breaking. It's also why the exhaust pipes are well clear of it, I did specify that to the guys building the exhaust at the time. Cooler oil can only help in the reliability stakes I think.

I'll get some pictures up when I have the rear wheel and calipers back on it, I do believe that it's begining to take shape at last Very Happy
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Jameshambleton
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Re: My Track bike project

Post by Jameshambleton on Sun 25 Feb 2018, 2:48 pm

I've never really understood oil coolers, my vfr has one and it's tiny (3 channels high, 17cm long ) I couldn't imagine it would make much difference to the temp of the oil overall.
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ANDYC
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Re: My Track bike project

Post by ANDYC on Thu 10 May 2018, 7:21 pm

Time for a bit of an update which is long overdue.
The engine went together nicely, only thing that I didn't forsee only became apparent when the engine is on the bench.
The coolant take off on the rear of the cylinder head is blocked by the different carbs so I'll have to fabricate one that comes out straight rather than at an angle.




The sump is still off whilst awaiting ARP stainless crankshaft bearing bolts coming from America, and the clutch is not on yet as I'm still deliberating on a new oil pump although there's nothing wrong with this one. It will probably be down to cost, isn't everything.
The starter motor is one of the few areas where I have conceeded the weight saving and added a few ounces in fitting a 929 fireblade one, I thought the extra power will come in handy to cope with the higher compression. After all if I cant get the thing started it will be an expensive doorstop.
I have gone for a larger alloy race radiator purely because I could.

The fairing is a race one for a CBR600rr4, it may not be the final choice but it gives me something to work with at the moment and helps me visualise the size etc.
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Jameshambleton
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Re: My Track bike project

Post by Jameshambleton on Thu 10 May 2018, 8:01 pm

Will be interested to see what you do with the oil cooler, cbr1000 I'm guessing?
How does it work exactly?
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ANDYC
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Re: My Track bike project

Post by ANDYC on Thu 10 May 2018, 8:10 pm

It's actually from an nc29 the fireblade used a larger one that doesn't fit our crankcases.
It's a water/oil transfer cooler. The water cools down the oil which gets much hotter than the water does.
It's less prone to all the inherent problems with oil/ air coolers.
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l.t.racing
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Re: My Track bike project

Post by l.t.racing on Thu 10 May 2018, 11:04 pm

Ti engine bolts aswell.have you blanked the water pump off. I love saving weight got mine down to 149kg wet but no fuel. And still got 2.5kg too remove next week.   I sooner want them carbs
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ANDYC
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Re: My Track bike project

Post by ANDYC on Fri 11 May 2018, 9:09 am

Unfortunately the carbs wont fit in the standard frame Lee, hence the frame change.
The water pump opening has indeed been blanked off, the drive for it has also been removed by shortening the oil pump spindle.
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ANDYC
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Re: My Track bike project

Post by ANDYC on Thu 31 May 2018, 2:33 pm

Bit of and update on recent progress.
The ARP stainless crankshaft bearing bolts arrived today, I wasn't taking any chances as I had one shear on me years back which scrapped the crankcases, and that was using a torque wrench to only 25Nm!

I also got around to fitting the clutch, I'm trying to resolve the backplate/ basket spring issue too.
The springs bearing directly on aluminium never impressed me so I'm switching to rubber as an experiment.
Hopefully if my research was successful this kind of rubber will withstand the enviroment with the heat and oil.
It will also quieten down the irritating rattle.


Time will tell Very Happy
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Beresford
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Re: My Track bike project

Post by Beresford on Thu 31 May 2018, 3:33 pm

Are you happy that those runs of lock wire will withstand the centrifugal forces loading them at 10,000+rpms?

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