Gear Ratios ??

Gear Ratios ??

Postby Ed Powell » 01 Nov 2009, 11:53

Hi all
I am in the process of fitting my Montesa 250 engine onto my Dino and need some advise! re gear ratios for both short and long circuit, whilst I know this engine is not very common I am looking for a ball park idea of what gearing I should be fitting, what are you guys running on your Villiers etc as there cannot be too much difference??
Cheers
Ed :?
Ed Powell
User avatar
Ed Powell
BHKC Member
 
Posts: 175
Joined: 28 Jan 2009, 21:27
Location: Evesham, Worcestershire

Re: Gear Ratios ??

Postby Skid_53 » 01 Nov 2009, 18:32

Hi Ed

On my Villiers for Strubby, Teeside and Rowrah I was running a 19 primary sprocket and a 30 final sprocket.

I hope that helps

Martin
Martin Marks
Skid_53
BHKC Member
 
Posts: 204
Joined: 08 Feb 2009, 22:19

Re: Gear Ratios ??

Postby Ed Powell » 01 Nov 2009, 20:33

Thanks Martin,
Any info is of great help and much appreciated
Many thanks
Ed
Ed Powell
User avatar
Ed Powell
BHKC Member
 
Posts: 175
Joined: 28 Jan 2009, 21:27
Location: Evesham, Worcestershire

Re: Gear Ratios ??

Postby classic Ed » 30 Jun 2010, 08:26

just to add my input. At Strubby I ran 15/30 on an iron barrel Villiers with I guess a top rpm of 8500. This also worked for Kimbolton and the Shenington short circuit. If the long circuit were to be used i would drop down to 28 at the back. If I were to run an alloy barrel with a high exhaust port i would expect it would run a tooth or two bigger at the back and still get the same if not slightly higher top speed. Please bear in mind that all engines make power and torque in different patterns so your longest gearing will be based on what the engine will pull.
When it comes to Cadwell demo i would gear long for it as we are running old engines and the back straight is very long to be at maximum revs for any length of time. Just not too long that it dies going up the hill. I will be running 15/26 for this event.
Any use to you all?
Ed Hocking.
User avatar
classic Ed
BHKC Member
 
Posts: 603
Joined: 26 Jan 2009, 15:40
Location: Bedworth


Return to GEAR RATIOS



Who is online

Users browsing this forum: No registered users and 1 guest