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My Track bike project

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Beresford
the 900
the 900

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Location : not that far from Kirkistown

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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the 900

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Location : Windsor

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
the 900
the 900

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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
Newbie
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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
the 900
the 900

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Posts : 824
Location : Windsor

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
the 900
the 900

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Location : Windsor

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
the 900
the 900

Posts : 1481
Location : not that far from Kirkistown

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
Hyper Viper
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Posts : 48
Location : Cambridge

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
the 900
the 900

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Location : Windsor

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
the 900
the 900

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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
Four's a...something...
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Posts : 151
Location : OSWESTRY SHROPSHIRE

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
the 900
the 900

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Location : Windsor

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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Posts : 48
Location : Cambridge

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
the 900
the 900

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Location : Windsor

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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Location : Auxerre, France.

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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the 900

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Location : Windsor

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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