As above, does anyone have a gearbox going spare?

Hi Hazel
My latest project came with an AO code Karman Ghia swing axle box. 4.125 final drive.
It's complete drum to drum with all new brakes and drums (wide 5) and a new clutch, pressure plate and release bearing.  After £300 for the whole lot.

http://www.beachbuggy.info/index.php/topic,8146.0.html

http://www.beachbuggy.info/index.php/topic,8146.0.html

THanks Hudge, just wasn't sure how I'd get a complete swing axle box to Scotland from Devon 
I'll list it in the 'for sale' if Hazel isn't interested.

[6 Pots...stuff your bhp, torque is king]

Hazel, other than the gearing change, any particular reason you want one?

Might be cheaper and easier to alter tyre size on the rear and go for an AO box.

Last AS code box I saw go on VZi went for north of £400.....I've got one in the garage but I've a Corvair engine that needs the gearing sorting before it guzzles all of OPECs oil mountain....!!!!

Quick addition, I could get it up to Redditch next Saturday with a mate if you're interested.
Make me an offer as its you  but be quick, ill have to get it out the car and down to my mate by Friday evening.

Hazel, other than the gearing change, any particular reason you want one?

Might be cheaper and easier to alter tyre size on the rear and go for an AO box.

Last AS code box I saw go on VZi went for north of £400.....I've got one in the garage but I've a Corvair engine that needs the gearing sorting before it guzzles all of OPECs oil mountain....!!!!

Because the engine seems to be revving quite a lot at higher speeds, thought a change of gearbox would help.

Quick addition, I could get it up to Redditch next Saturday with a mate if you're interested.
Make me an offer as its you  but be quick, ill have to get it out the car and down to my mate by Friday evening.

Send you an email 

 

[6 Pots...stuff your bhp, torque is king]

What box do you run currently? Is it an AB code?? Seem to remember it was for some reason....

Anyway, the box on its on will make some difference, perhaps 400rpm at 70mph. This is a chart a guy on DW knocked up for me showing me the different combos and what effect theyve have on my revs.




Whilst the gearbox will make some difference, tyres and box change will make quite a difference, 10mph at the same point in the rev range....

This is an interactive one that I also knocked up:


For those of you that wish to work it out for yourself, you may find this formula to be a good starting point:   

MPH = (Tyre Profile(mm)*Tyre Width(mm)/100+Rim Diameter(inches)*25.4/2)*2*3.14159*Engine RPM*60/(Final Drive Ratio*Gear Ratio*1000000)*0.62137

Or . . . . .

Here's one I prepared earlier - If you are trying to compare different gearboxes, then have a look at this "live" spreadsheet   


www.beachbuggy.info/DNDGearboxCalc.xlsx     


Open it up with Microsoft Excel and "ENABLE EDITING" - You will then be able to play around with different wheel and tyre combinations and quickly see from both the live data and the graphs how it will affect your Buggy right across the range.


Important things to consider:

Look for the engine revolution speeds where you would normally change gear, and make sure that you can still potter about town or country lanes in your chosen gear.

Be mindful of what power your engine can actually produce as there is no point gearing your car up to do 100 mph if your engine runs out of steam long before you can get there.