SPEEDWAY, FABULOUS SPEEDWAY

Please discuss here all your remarks and pose your questions about all racing series, except Formula One. Both technical and other questions about GP2, Touring cars, IRL, LMS, ...
johnny comelately
johnny comelately
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SPEEDWAY, FABULOUS SPEEDWAY

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FIM World Championships kicking off in Croatia right nowish.
All sprints, no aero, no tyre challenges, 90% the rider, = better racing (and relatively cheap)
What is one of the main tuning changes for different tracks? NO googling
Would they be quicker if they stood the engines up? and why?


Last edited by johnny comelately on Tue May 03, 2022 5:39 am, edited 1 time in total.

johnny comelately
johnny comelately
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Joined: Thu Apr 09, 2015 11:55 pm
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Re: SPEEDWAY, FABULOUS SPEEDWAY

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Reason/excuse of the year for jump start goes to Anders Thomsen:
Interviewer: Did you forget we are on the computer system (tapes start)
Anders: I didnt forget, I was just faster than the new system
Fall off my chair :lol: =D>

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Stu
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Re: SPEEDWAY, FABULOUS SPEEDWAY

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I grew up watching Speedway, loved it. Pestered my mum & dad for speedway wallpaper (yes, there was such a thing!).
Michael Lee was my hero.
I had two posters up on my door (not allowed them in the wall after I got the wallpaper 😂😂😂), him and the Williams FW07.

I met him a few times & later worked with his mechanic.

As far as I can recall, tuning was done in two ways…
Fuel mix (dope), which I think is a methanol based fuel (you don’t want to overpower the track surface) - the smell stays with you 😎
Clutch, just enough tyre slip to get good bite out of the gate, not so much that the tyre is shocked into spinning up.
Gearing was only ever really changed for long track (1/2 mile).
Perspective - Understanding that sometimes the truths we cling to depend greatly on our own point of view.

johnny comelately
johnny comelately
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Joined: Thu Apr 09, 2015 11:55 pm
Location: Australia

Re: SPEEDWAY, FABULOUS SPEEDWAY

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Stu wrote:
Mon May 02, 2022 7:27 am
I grew up watching Speedway, loved it. Pestered my mum & dad for speedway wallpaper (yes, there was such a thing!).
Michael Lee was my hero.
I had two posters up on my door (not allowed them in the wall after I got the wallpaper 😂😂😂), him and the Williams FW07.

I met him a few times & later worked with his mechanic.

As far as I can recall, tuning was done in two ways…
Fuel mix (dope), which I think is a methanol based fuel (you don’t want to overpower the track surface) - the smell stays with you 😎
Clutch, just enough tyre slip to get good bite out of the gate, not so much that the tyre is shocked into spinning up.
Gearing was only ever really changed for long track (1/2 mile).
Very interesting, some say men have a defective gene, like when a bonnet/hood goes up they must look :)
My fault there I should have said engine tuning, sorry.
Compression ratio is one of the main methods, wet track etc
How about the engine position question??

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Stu
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Re: SPEEDWAY, FABULOUS SPEEDWAY

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As regards the engine position, there are upright engines and ‘flat’ engines. From an engineering perspective I would say that for short-track racing the flat engine would probably make for a more ‘adjustable’ bike through the turns having a lower moment of inertia (in relation to the ground axis), they also tend to a longer wheelbase (which has an advantage off the line (no rear suspension) and improves stability at speed.

An upright engine would lend itself to getting the bike over as it enters the turns, the shorter wheelbase would also help here. At most other parts of the track it would be disadvantaged. The upright design may be better suited to grass-track racing, which tends to take place on a ‘long’ track and has significant track evolution making the theoretically more manoeuvrable bike advantageous.
Perspective - Understanding that sometimes the truths we cling to depend greatly on our own point of view.

johnny comelately
johnny comelately
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Joined: Thu Apr 09, 2015 11:55 pm
Location: Australia

Re: SPEEDWAY, FABULOUS SPEEDWAY

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C of G is an interesting thing on bikes.
Higher gives more contact pressure = traction, drive.
how much do you want on dirt.
but speedway being a different animal the flickability is very important, I always thought that with a bit more traction the drive would be better.
The front wheel doesnt need the load as much
So in the end its about balance and compromise, as always ideal to find the sweet spot.
It is a consideration in road racing.
Quite the opposite of cars and the quest for low C of G.
be interesting to get some more chassis' peoples input
Thanks Stu.

johnny comelately
johnny comelately
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Joined: Thu Apr 09, 2015 11:55 pm
Location: Australia

Re: SPEEDWAY, FABULOUS SPEEDWAY

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Then there is the close cousin, The Mile
But thats a story for another day

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Airshifter
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Re: SPEEDWAY, FABULOUS SPEEDWAY

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They sure are a blast to watch in person. Being in southern California as a youngster, they had anything and everything on two wheels. I thought I had seen it all until the first Speedway races we went to. As for tuning them and setting them up, I have no idea. I just want to know how hard it is to keep that throttle pinned and toss it into that first corner! :mrgreen:

johnny comelately
johnny comelately
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Joined: Thu Apr 09, 2015 11:55 pm
Location: Australia

Re: SPEEDWAY, FABULOUS SPEEDWAY

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Cousin Longtrack
100 MPH



johnny comelately
johnny comelately
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Joined: Thu Apr 09, 2015 11:55 pm
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Re: SPEEDWAY, FABULOUS SPEEDWAY

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A bit more modern, sprint racing at its best


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Stu
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Re: SPEEDWAY, FABULOUS SPEEDWAY

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I’ve just relapsed to my 8 year old self and am thoroughly enjoying Speedway again, TV at the moment, but nothing beats in the flesh!!
Perspective - Understanding that sometimes the truths we cling to depend greatly on our own point of view.