I have got to decide on what diff ratio, wheel sizes and drop gears to run in my van. The motor is 1330, all synch close ratio box, some sort of wild cam which I may ditch and at the moment has a top speed that is very low. I don't believe the speedo, just know it revs very hard in top. It is going to do a lot of driving on freeways towing a light flat top trailer with a kart on it and all the race gear inside. I know nothing about gearing these things, just that the gearing it is running is a joke at 100kph. Any ideas on gearing and a cam and what size wheels....10, 12 or 13's???

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Chris

Everything I like is either
illegal, immoral or fattening.

If you don't mind it being slower off the mark, (considering SCCR box) fit a 3.44.
If you are going to use for track only, I'd fit a 3.765. (probably what it's got if revving its tits off).
If you can't decide between the 2 above, fit a 3.647..

What rpm does the came `come in' at?
If over 3000 they are a PITA to drive, for road use.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Kevin, I forgot to mention it is on 10's at the moment. Are there any charts anywhere with all the combinations of wheels/diffs/drop gears, that give answers to this. I am not after a track ratio, we travel from Sydney to Wakefield at least once a month and if he runs it at the track he can put up with the ratio that will be in it. Anyway he has his karts to do that in. A bit quicker than a Mini at any track!

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Chris

Everything I like is either
illegal, immoral or fattening.

I would fit a 3.44, but just be aware that off the mark with the 2.5:1 (approx) 1st gear, it will be a bit slower.
A 1330 will pull a 3.44 diff easily, even with 13" wheels.
Not much higher ratio available here in Oz- 3.44 was the tallest we got.
If you could find one in UK, 3.1 would be nice for highway use.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Download GearCalc to help you work out all you need to know.
http://locost7.info/gearcalc.php

Kevin, do you know the internal gearbox ratios so I can put them into the gear calculation program.

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Chris

Everything I like is either
illegal, immoral or fattening.

Can't find my book with the gear ratios.. so..
you will have to do some arithmetic from info below:

NOTE: standard drop gear ratio is 1:1.

Info from MiniMania site-
GEAR KIT STRAIGHT CUT CLOSE RATIO 4SYNC
By using the very latest gear cutting techniques, equipment and top line manufacture it has been possible for us to market a close ratio, straight cut gear set with greatly reduced noise output usually associated with running a straight cut gearbox. This is ideal for powerful road engines where a close ratio, low power absorbing gear set is required to enhance engine performance.The gear set includes first, second, third gears, laygear, first motion shaft & a reverse gear. Original Abingdon ST gear ratios manufactured by using the very latest gear cutting techniques, equipment and top line manufacture it has been possible for us to market a superior close ratio, straight cut gear set with moly coated baulk ring cone surfaces.The gear set includes first, second, third gears, laygear, first motion shaft & a reverse gear. All our speed gears are manufactured using original Rover powertrain tooling. Please ensure you checkyour bauk rings for trueness as both genuine and MS are not as true as our C-22a1741 when fitting this gearkit. Straight Cut Gear Kits Straight Cut Gears Remote Type St Rod Change Pre-A+ Rod Change ‘A+’





Part Number for Kits C-AJJ4014 C-STN76 C-STN77
1st motion pre ‘A’ plus, 19 teeth C-22A1732 C-22A1732

1st motion ‘A’ plus, 19 teeth

C-22A1732A
3rd Gear, 22 teeth C-22A1733 C-22A1733 C-22A1733
2nd Gear, 25 teeth C-22A1734 C-22A1734 C-22A1734
1st Gear, 29 teeth C-22A1735 C-22A1735 C-22A1735
Laygear, 15,19,23,25 teeth C-22A1737 C-22A1737

‘A’ Plus Laygear

C-22A1737A
Reverse Gear rod Gear C-22A1736


Rog Change Reverse Gear
C-STR303 C-STR303
Straight Cut Gear Kits Straight Cut Gears Remote Type St Rod Change Pre-A+ Rod Change ‘A+’





Part Number for Kits C-AJJ4014 C-STN76 C-STN77
1st motion pre ‘A’ plus, 19 teeth C-22A1732 C-22A1732

1st motion ‘A’ plus, 19 teeth

C-22A1732A
3rd Gear, 22 teeth C-22A1733 C-22A1733 C-22A1733
2nd Gear, 25 teeth C-22A1734 C-22A1734 C-22A1734
1st Gear, 29 teeth C-22A1735 C-22A1735 C-22A1735
Laygear, 15,19,23,25 teeth C-22A1737 C-22A1737

‘A’ Plus Laygear

C-22A1737A
Reverse Gear rod Gear C-22A1736


Rog Change Reverse Gear
C-STR303 C-STR303


Additional Information/Installation/Applicaition
Fits the Following Cars: MINI
C-AJJ4014 Categories: [GEARBOXES] [PERFORMANCE]
Price: US$1,095.00

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

OK found this in Vizard's HTMYM..

4 synchro SCCR gearset-
1st 2.543:1
2nd 1.73:1
3rd 1.257:1
4th 1:1

By comparison, MK2 S gears are:
1st 3.3:1
2nd 2.07:1
3rd 1.35:1
4th 1:1

and Mini K & std rodchange (pre-A+) are:
1st 3.52:1
2nd 2.22:1
3rd 1.43:1
4th 1:1

Enjoy!

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks Kevin. I'm going racing this weekend so will catch up to you on the dog and bone next week.

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Chris

Everything I like is either
illegal, immoral or fattening.

Chris you sly dog....tell as about raisen!! You weren't at Wakefield Historics were you??.....if so I will be so pissed I didn't have the chance to say hello....

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"Show me the Mini!"

No mate, we race karts. That's why we want to build a mini van. I've built a small flat top trailer to put the kart on and will throw all the other stuff in the van. We race at Wakefield about once a month though next year we will be doing the van and very little racing. If anyone wants to have a go in a kart I can arrange it. Definitly gauaranteed to put a smile on your dial. Everyone thinks they are toys until they try them and find they are not. I wouldn't go back to racing cars even if someone paid the bills. To much hassle.

_________________
Chris

Everything I like is either
illegal, immoral or fattening.

doc
u say these shorter gears are for better speed yer?
which makes sense.
but when i went in my mates 1275 (not sure what it was out of) it revved every gear out WAY further than my 1100 will go.
im talking 3rd gear he could take to nearly 100kph (this was a while back so i may be off) but this thing had such long gears, but it pulled SO HARD!

im thinking long gears for the a+ metro 1275 i've got?

Speed in the gears depends on the gear ratios in box, and the diff ratio.
I run MK2 S gears in my 1310- with a 3.44 diff. 3rd gear is good for about 90MPH (on speedo) at 7500 rpm. I can get nearly 60 MPH in 2nd, at 8000 rpm...

But OTOH, by comparison 1098s had pretty short gearing- diffs were either 3.765 or 3.647. Gears (Mini-K or rodchange) were a bit wider spaced. And they only revved to 5500 or so. So, they didn't go real fast in the gears.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Ahhhh, yes read that part some time ago.....silly me.....yep Karts are great fun so long as your head lets you go deeper and deeper and deeper without freaking out!! not to mention the G Forces!! and this is only at a speed governed Kart for hire place!!

Real racing Karts must be a blast!! Cheers, Mick

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"Show me the Mini!"

I';m in for a run in a real Kart..I'v only enjoyed the Hire karts myself Before I got Marcia it was a toss up between an Mini Van EH Holden Wagon or a real 125 Rotax powered CRG kart.. I went to number of races to watch at Eastern creek and the Gong. I was rite in front of the barrier when that poor girl got killed hiting the barriers...Very sad

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Stop Licking the Dog...I Don't Care Who Started It