BSA Bantam Racing

Bantam Racing Club
 
HomeHome  FAQFAQ  SearchSearch  RegisterRegister  MemberlistMemberlist  UsergroupsUsergroups  Log in  

Share | 
 

 Gears and gearings

View previous topic View next topic Go down 
AuthorMessage
mjpowell

avatar

Number of posts : 1074
Localisation : Lincoln England
Registration date : 2006-12-09

PostSubject: Gears and gearings   Mon Feb 06, 2012 10:05 pm

Thought I'd start this afresh - after Derek post on another topic.

I think what Derek was doing was telling people there are a number of combinations of output pair.

Press on gear/sleeve gear CR 23/24 Snell 22/25 Late D7 21/26

Bear in mind the output gears dont change the 'Top' gear ratio. Top is 1:1 or straight through
ie whats go in / through / and out of the gear is un-changed.

A CR box has 3 close ratios. With a snell output pair 2nd and bottom the box is basically semi-close.
With lateD7 o/p the gaps betwween gears are even bigger (2nd/top being the biggest) the engine would need to be really torquey to work- poss on a 175 not a 125.

4 speed box I have no idea, Derek John S to advise ... my advise is use 3 gears..

The other thing of course is primary gearing by changing the engine sprocket - I believe Derek was testing a 12/13t opposed to the std 17t ... Any news Derek?

ps 23/25 dosen't fit but 22/24 does (but not recommended)

Back to top Go down
View user profile
Derek

avatar

Number of posts : 1065
Age : 56
Localisation : worcestershire
Registration date : 2007-06-15

PostSubject: Re: Gears and gearings   Tue Feb 07, 2012 5:08 am

Hi Mike
Thank you for correcting me - ref output gears, you are absolutly correct of course a mistake on my part,

All good stuff but you could have tagged this onto the back end of edds request, can not remeber what I wrote of circuits gearing now & I hope I never said anything wrong.

also you missed off the 175 4 speed stuff, Im sure this was correct.

Kind regards

Derek.
Back to top Go down
View user profile
mjpowell

avatar

Number of posts : 1074
Localisation : Lincoln England
Registration date : 2006-12-09

PostSubject: Re: Gears and gearings   Tue Feb 07, 2012 7:36 am

Derek did you test the smaller engine sprocket?

4 speed thinking about it- John S has free rein with his box where racers with 175s
have conform to the road gears or a combination of them resulting in basically a 3
speed semi close box(4,3,2) with a very low bottom(1)

Suggested Gearing for a 175 revving to 9'000

Cadwell, Mallory,Darley Moor - 16x50
Snetterton 16x48
Lydden 16x54

Regards Mike
Back to top Go down
View user profile
Derek

avatar

Number of posts : 1065
Age : 56
Localisation : worcestershire
Registration date : 2007-06-15

PostSubject: Re: Gears and gearings   Tue Feb 07, 2012 9:50 am

hi Mike

thanks on the gears info

i will report on the crank sprocket sizes as soon as I have results one way or the other.
Back to top Go down
View user profile
mjpowell

avatar

Number of posts : 1074
Localisation : Lincoln England
Registration date : 2006-12-09

PostSubject: Re: Gears and gearings   Sat Mar 17, 2012 9:05 am

For Derek:-

Back to top Go down
View user profile
Derek

avatar

Number of posts : 1065
Age : 56
Localisation : worcestershire
Registration date : 2007-06-15

PostSubject: Re: Gears and gearings   Sat Mar 17, 2012 9:35 am

Hi Mike

Mike, I take my hat off to you, well done, and thank you.

you have been quiet,! what are you up too!

Anyway great pict, could you take off the out put pair and show the picture from the same shot, please, and no worries, its much appreciated, I dont think we have seen the timing side inner shot, these types of posts always add weight and assist, but when I was 21 or was it 26", I was in the middle of my prime, well I got married, so never really had chance to find this set up, but neither do I today, but we will be try this, we are currently trying to sort the needle rollers mod, we are getting there and should soon have the full monty, ! now I'm 50, It's taken that long to find out all I need to know, well im not sure yet ? I have all the information. but now I just need to make the mods required, and do the trials, and them all will be revealed, I spotted this by chance, when doodling with John Senddles spread sheet, showed me there are alternative setup to make snell work properly, The other should never dis anything I say as my information is credible even though Iam Human and do get things wrong, I feel its a shame this info was not common knowledge, back in the day, as it certainly makes a difference where it matters, to guys like me. besides if your quick and the bike is you dont need an advantage.!, as many others are diasadvatages against the like of you feather weights -!! ok ok Iwill stop the add weight to light weight riders ! (Ian's bike) campaign.

Beside lets not spoil the current topic, TRANSFER DUCTS did you spot that snip bit from Trevore Isee it as equal to the second reverlation or the second comming, you know more bout this than me and we must not interject while Trevor is on this roller coaster ride to properly (spilling the beans on why his bike excellerats like a a scalded cat) hmmm supporting us none beleavers to the road of the best one follow,

So the current debate is Transfer Ducts, direction of flow and most importantly the correct length of rod for the stroke (short/long) the enegine is ( if i were you i would be looking at how I could be using a shorter Rod) did you see that little snip bit,!!! I have been wondering about this fenomena since 30 years ago when I first stood in the garage looking overr dads sholder cleaning out all that dirty crap, asking why is it so dirty, I always thought is was comming off the back wheel??? !. Trevor told us all in a sentence that took less than 5 words to explain, for me it was like the reverlation, I hope others got it" and my good what a difference, we can not wait to make the other mods to try, but all in good time.


on another note Midlands meet Mike you going to the practice day?, I had planned to be there, but it looks like Im sidelined with some work to do on the internals, at Im not sure I well be there,

So what do you know about the head /under-plug temp sensor and gauge set up.? who can help me here.

an finally are you comming to our next meeting of midlands boys, ! you are very welcome", you presence at the last meeting gave a lot of (light) weight, I feel your presence and far more importantly what you bought to show every one was (comendable) great for our first meet,

what a great day it was too.

" just do not know how "we" are going to follow it up, " but we will !!!! as Valentino Rossi agent has confirmed he is available, ? but we do not have the time for showmen!!!! I said we will vote if he can come later in the year, but only after he has shown he is still a racer not a winger"""""!!!!!!,
more importantly, Mick Potter has confirmed he is willing to attend, you know the others just nwaiting for confirmation, but Ifeel it will be even better than the last one, but I dont want to ask /beg them make the journey for just 5 people, we need the same turnout as the last meeting or we may have a few more, so not leaving anyone out, "the more the merry'er".

best regards too all

Derek



Back to top Go down
View user profile
Sponsored content




PostSubject: Re: Gears and gearings   

Back to top Go down
 
Gears and gearings
View previous topic View next topic Back to top 
Page 1 of 1
 Similar topics
-
» Gears and gearings
» Engine is missing / hesitating under load. Noticeable in 1,2,3 gears. Any ideas?
» Clutch lever feels loose; gears won't engage.
» For Sale: BLITZKRIEG high end quality rain gears!
» Close Ratio Layshaft gears

Permissions in this forum:You cannot reply to topics in this forum
BSA Bantam Racing :: Your first category :: Bantam Racing Forum-
Jump to: