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 what are we doing this year and what are our targets

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Derek

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PostSubject: what are we doing this year and what are our targets    Fri Mar 22, 2013 8:59 am

I was recently asked am I racing in 2013 well the answer to this is clearly yes, even though I gave a levelled responce, this, I joined the CRMC, intending to do the 200cc championship, as well as selected VMCC rounds, which one's will depend on a number of aspects,
My Engine is producing a lot more power, my cornering is almost there, so when it rolls out onto the tarmac it will have a lot more potentioal, my taget is to shed another stone, I'm nearly there. On last years targets, Im down to 12.5 stone now, I just need to lose another three stone or add another 5hp to compensate.! I intend catch up and will try and make comments on "all" those I have not been able to comment on, I will get to them all "eventually".


Last edited by Derek on Sun Apr 07, 2013 9:56 pm; edited 2 times in total
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dansofield550

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PostSubject: Re: what are we doing this year and what are our targets    Fri Mar 22, 2013 10:58 pm

hello derek ,

interesting reading , not sure i really understand the weight issue you mention, or the unfairness of a lighter rider, surely its just luck of birth to be small not a case of unfairness? and bikes and riders all the same weight made me chuckle , just imagine a real 18st chubber turning up to have a go ! we'd have to make lead wheels and tanks etc .



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Derek

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PostSubject: Re: what are we doing this year and what are our targets    Sat Mar 23, 2013 8:15 am

there is indeed an unfair advantage to the lighter rider, this is why in many other fields of racing auto sports, they have a minimum inclusive weight, karting, Minimoto's, and F1, the weight of the car minimum includes the driver.

a liter weight will excellerate at a potentially greater disstance, you can brake later to as the lower weight will stop quicker, I'm thinking af asking for a minimum weight that includes the riser, ioffer a proper weight at 165 kg minimum.
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john bass

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PostSubject: Go faster from Park to Mansfield...   Sat Mar 23, 2013 6:00 pm

Chubber goes faster from Park to Mansfield and that bit of Cadwell is real fun! Mansfield my favourite bend!!

Long live Cadwell and Mallory and Brands and... .... ....


Good luck!
John-Boy!
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Ned

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PostSubject: Re: what are we doing this year and what are our targets    Sun Mar 24, 2013 4:58 am

I found being larger than the average 125 rider had it's advantages.
When one of the 7 stone riders complained that I had cut them up I just growled "So What" Laughing
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john bass

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PostSubject: Handsome! Like it Ned....   Sun Mar 24, 2013 5:15 am

Handsome! I like it Ned...

I know you all know this and as much as I┤d rather not bore you I shall --- just to be spiteful `cos I was a born heavyweight.

It is a fact that "F = ma" where `F┤ is tractive force, `m┤ is mass -- total weight divided by force of gravity -- and `a┤ is acceleration. Since winning races relies on `a┤ being a maximum and we put the formula like this, "a = F/m" we see that the ratio of F/m means that whatever gains we make by increasing F can be lost by having large m....

What Chubber prays for is rain -- he then has a chance of winning...

By experience -- I know!!

All the best at Mallory.
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Derek

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PostSubject: Re: what are we doing this year and what are our targets    Sun Mar 24, 2013 6:04 am

I think I'm a perfect Gentleman

Hi John:- if your trying to say, down hill - bigger, is in some way faster in tems of excelleration, if you are refering to it, surely this cannot be considered here, if you were dropping directly downwards "may be".
Fact a lighter rider will always win with the same torque or power, he will stop quicker and excellerate faster so to will his top speed be higher, his bike will handle the bumps beter put less stress on the tyres, he win's hands down, and the graph is not a linear one, especially round a circuit. I wonder what the F1 or any othe engineers would have to say on this. !

not sure why we are talking about this, what I asked was, what are our/your plans and targets for the comming season.

Derek


Last edited by Derek on Sun Apr 07, 2013 9:57 pm; edited 1 time in total
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john bass

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PostSubject: Is anyone prepared to tell...   Mon Apr 01, 2013 4:43 am

Is anyone prepared to tell what happened at Mallory -- or was the weather so bad the meeting was cancelled?

I cannot find any reference to it on here??
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ROBBIE

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PostSubject: Re: what are we doing this year and what are our targets    Mon Apr 01, 2013 8:47 am

Hi john
Yes mallory pratice day did run 9 bantams on the track and 3 bantams parted company with there riders
as for me I had some gremlins but wen they was sorted my bike was flyin due to some engine mods over the winter
something that you will be pleased with Surprised
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Derek

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PostSubject: Re: what are we doing this year and what are our targets    Mon Apr 01, 2013 9:09 am

hi Rob
why would we be pleased with your engine mods Rob, ?

what are they, ?

what about some pictures for us to take a look,

are you saying there were three Bantam riders who fell off at practice ?

regards Derek
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ROBBIE

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PostSubject: Re: what are we doing this year and what are our targets    Mon Apr 01, 2013 5:16 pm

Hi Derek
The clue is in the post its says The word YOU as in John Laughing
and I got it wrong 4 bantam riders fell off but one not on a bantam
And I let the Riders own up to who fell off Embarassed
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Derek

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PostSubject: Re: what are we doing this year and what are our targets    Mon Apr 01, 2013 6:35 pm

Hi Rob

"my goodness ROB" its bank holiday monday, so early, why arn't you having a lie in, !

Anyway your responce spiked a funny memory for me "falling off in practice" is nowhere near as embarising as falling on on the "warm up lap" and at the head of the field (not me), thankfully all all cases no rider was hurt, but one could not help but smile, I remeber this is still not nearly as embarissing as falling off in the paddock, just before the collecting area at the old paddock snetterton (me) and Dave kindsnorth pulling me fron under the bike check Iwas OK then Bollocking me, and to get out the way, of a packed pits/collection area, this was at the time of the old garages and the packed viewing area on top, some iddiots clapped me, after Dave in avery laud voice had finished dressing me down, and get that bike re-scrutineered. who needs memories!.

"food thought" views or positive comments welcome.
Derek


Last edited by Derek on Sun Apr 07, 2013 9:58 pm; edited 1 time in total
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Trevor Amos



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PostSubject: Re: what are we doing this year and what are our targets    Tue Apr 02, 2013 1:51 am

Derek , and all ,
Picking up on exhaust front pipe sizes , the actual pipe inlet diameter is not the issue but the duct cross sectional area and length . In fact it is now thought that on a full house race engine it is only the blowdown , plus a bit , csa that needs to be catered for , not the whole port area . Usefull exhaust flow is over long before the port is fully open , the initial flow rate is at a sonic level , but it does rapidly slow , but if the port opens to a large csa duct then flow slows , the gas cools and the accoustic pressure wave has reduced energy level , way before it gets to the actual pipe and the outcome is reduced power for the pipe dimensions you have calculated for your engine using a specific wave speed !
The Honda has a barrel outlet of 39x35mm oval but the pipe is 41mm round , perfectly ok for 40+ bhp .
Looking at the duct in reverse flow mode , then a smaller csa duct contains less hot gas to be pushed back into the cylinder , and this feature alone could help keep a thermally vulnerable air cooled engine just free of overheating , and possible deto !

On my w/c engine the ex duct is only 50mm long , the exterior pipe fittment adaptor is profiled internally so is part of the actual pipe geometry , heat feed back is reduced
and the whole of the duct has water flowing around it , the water temperature is low and the engine has no internal heat problems .

Most Bantam barrels have a single ex port and it seems from testing on other baarrels that a duct outlet of 85-90% of the port area gets the job done , that is not to say that another size won`t work , but remember that there are few other racing 125/175 engines that are as power deficient as a Bantam , so these issues are not as critical as at first may be thought .

Derek , slow down a bit , i`m an old man , i can`t keep pace with all of your posts , i need an afternoon nap to regenerate , the spirit may be ok but the flesh is lacking !!

Regards , Trevor
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Derek

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PostSubject: Re: what are we doing this year and what are our targets    Tue Apr 02, 2013 3:48 am

1) I dont believe it" grrrrr just lost a right mission of a responce for you, but basically
2) what is CSA stand for. ?
3) The height of my port would only equaly a pipe about 20mm diameter approx, thats smaller than my tail pipe, if we only needed transfer to exhaust opening, would one not need more port area if you did this or perhaps more ports.
yes will keep them shorter in future Only Di is away in India, so Im unlimited opportunities at the moment, just taking advantage of this at the moment.

Derek
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Trevor Amos



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PostSubject: Re: what are we doing this year and what are our targets    Tue Apr 02, 2013 4:08 am

Derek .
We all suffer gremlins like that , have another go .
Csa , cross sectional area .
Not just the height but the whole area of the port , sorry , should have written that a lot clearer .
As an example , if your ex port had an area of 900 sq mm then 90% , or .9 , would equate to a duct outlet of approx 32.5mm diameter

Hope Di is safe and well over there , and has the correct medication to combat the dreaded tummy upset ?

Trevor


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Derek

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PostSubject: Re: what are we doing this year and what are our targets    Tue Apr 02, 2013 7:27 am

Hi Trevor Hmm "maths".
Anyway thanks and yes its comming out just under 32mm as a bit smaller than the 900sq mm, my duct is already 36mm should I sleeve it down perhaps thats why it never worked correctly before ?

Derek


Last edited by Derek on Sun Apr 07, 2013 9:59 pm; edited 1 time in total
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Trevor Amos



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PostSubject: Re: what are we doing this year and what are our targets    Tue Apr 02, 2013 9:28 am

Derek,
Yes , you could sleeve the duct and you may see some benefit , or not , there are no guarantees . If you could make a removable sleeve then a before and after test could be tried , might be an interesting exercise !

Trevor
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Derek

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PostSubject: Re: what are we doing this year and what are our targets    Tue Apr 02, 2013 9:47 am

cracking idea Trevor

One assumes because I have a std cylinder outlet, it will be difficult to get it all the way inside ? the cylinder barrel, I was thinking a top hat affair on the outter side do you think this is enough ? or do you think this would be sufficient to try this theory out ?
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john bass

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PostSubject: One must -- Derek -- mustn┤t one?   Tue Apr 02, 2013 7:19 pm

One must -- Derek -- mustn┤t one?

To test the verisimiltude▓▓ one must find the shibboleth│││ that fits...

... humble apologies for the attempted wind-up, Derek ... I Missed out on April Fool and need to make up for it...

I agree, less abbreviations ....

You don┤t need an honours degree in Maths to count your millions but sometimes it helps to pretend that you do have....


▓▓ means "appearance of being true..." or credible...

│││ is "Catchword" or key phrase that gets you in among the elitists and aristocrats -- perhaps even royalty....

What a load of Old-cobblers!!

What┤s Di doing in India? Setting up a new comapny???

Cheers!

John-Boy.
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Trevor Amos



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PostSubject: Re: what are we doing this year and what are our targets    Tue Apr 02, 2013 9:33 pm

Derek ,
Here is an idea , leave the barrel outlet at 36mm wide and make the insert fill the top and/or bottom of the duct , going in as far as is practicable , and form an oval outlet blending to you existing 36mm dia. pipe , this will be similar to the Honda arrangement and reduce the duct volume . A thin flange could hold it all in place and the whole thing would resemble a tuning fork ! If no improvement is felt you can dispense with it , however , don`t expect a 5 bhp power jump , cos it won`t happen !

Trevor
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Derek

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PostSubject: Re: what are we doing this year and what are our targets    Wed Apr 03, 2013 8:20 am

Hi Trevor thanks for that, I have tried oval exhaust outlet, it did work, sadly did not really have the the resources to get the best from it, I found the ideal shape from two years as contract Engineer, for TRW part of special military engine fuel systems team, working with some very cleaver people, who were facinated with my Bantam.

John not sure I'm following your outrageous post !
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john bass

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PostSubject: Just fooling about Derek...   Wed Apr 03, 2013 9:10 pm

Just fooling about Derek whilst trying to explain that some writers need to use big words to lift and promote their image.

No one on here though.

Cheers!
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Derek

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PostSubject: Re: what are we doing this year and what are our targets    Thu Apr 04, 2013 7:31 am

Hi John
all is forgiven !!!

Derek


Last edited by Derek on Sun Apr 07, 2013 10:00 pm; edited 1 time in total
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john bass

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PostSubject: Hi Derek...   Thu Apr 04, 2013 9:07 pm

Hi Derek!
Some people are good at manipulating numbers, some Úxcellent with words and others brilliant at making things -- and making those things work for virtually nothing. An engineer -- whether wearing cap & gown from university or wearing a bench fitter┤s overall or a welder┤s face mask -- only proves himself when -- whatever it is he is making, WORKS! Better still -- making it for the least possible cost. America┤s president, Herbert Hoover said something like that in 1923 and at that time there was only Henry Ford who fitted the description ....!!

Just a lot of words Derek -- what else can I do? -- I can┤t even get over to your Midlands Centre Bantam do where I would no doubt cause a distiurbance sufficient to get me thrown out as an "Easten Cenre Cad."

Could you supply a list of names with the pic of the last meeting -- I only know one, I think because he was holding a suspension
leg.

Stay cool!

Cheers!
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Derek

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PostSubject: Re: what are we doing this year and what are our targets    Sat Apr 06, 2013 9:10 pm

Trevor Amos wrote:
Derek , and all ,
Picking up on exhaust front pipe sizes , the actual pipe inlet diameter is not the issue but the duct cross sectional area and length . In fact it is now thought that on a full house race engine it is only the blowdown , plus a bit , csa that needs to be catered for , not the whole port area . Usefull exhaust flow is over long before the port is fully open , the initial flow rate is at a sonic level , but it does rapidly slow , but if the port opens to a large csa duct then flow slows , the gas cools and the accoustic pressure wave has reduced energy level , way before it gets to the actual pipe and the outcome is reduced power for the pipe dimensions you have calculated for your engine using a specific wave speed !Regards , Trevor

Hi Trevor,
So my final question is "do you think" the top edge of the exhaust port is that critical to a Bantam Racer, and if it has such an effect on power band width/torque should we not have some guides as to a good width for torque and one for a higher revving "light switch power band motor", ?
(weather it be 125 or 175(190).


regards Derek

p.s kept this much shorter.


Last edited by Derek on Sun Apr 07, 2013 10:01 pm; edited 1 time in total
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