heyy i have a 1310 engine and i have taken the gearbox out,

i was just wondering whats the best ratio for an engine like this, iv got the racing ratio on atm but my top speed isnt the best lol

i have these diffs so,
17/62
17/64
18/62

i would just like more top end speed and not so much hi revs


thankz

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The 18/62 is a 3.44 so that'll be better than the other two if you want lower cruising revs.

Cheers,
Simon

18/62 =3.44
17/62 =3.64
17/64 =3.76
The 3.44 will give you more top end and better fuel economy when cruzin
The 3.77 will give faster take off and when cruzin engine will rev higher
I would go for the 3.44 diff

well i want a bit of both
lol i like the quick take off bcoz it munches all the cars and people just go WTF do u have in ur car lol

so 17/62 =3.64 would be lil more top end and less hi revs
?

thankz

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I'm a fan of the 3.444, not too long, not too short, just right.

A 1310, providing it's all well and good, should have enough power and torque to get moving at a decent pace, and still keep 100kph below 4000rpm.

Depends what you want the car for? Cruising or zooming around at low speed? Still either way I'd go 3.444.

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

Lower the number, (62 divide by 17 is ~3.64, should actually be 62/17, but yeah...) the lower the rpm any speed will be at in any gear, but acceleration will be lost, it's a comprimise between economy, acceleration and I guess, noise.

Like wise, the higher the number, eg 3.64, 3.8 etc the higher the rpm at any speed will be, but the car will accelerate faster.

NOTE - Actual top speed won't change or may get less with longer diff (lower number) as the engine will have to work harder to achieve those speeds, I think.

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

I put a 3.647 in my 1275 Moke when I was replacing the half-moon crankcase oilseal (up from the std. 4.267). I now wish I'd put in a 3.444.

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1967 Cooper S - new front bearings to do.
1965 Cooper S shell - Slow progress. No time or money!
1966 Deluxe- next rustoration!
Mk 2 & XJ6 Jags. Less said the better.

you have 13 inch wheels by the look of it, if this is the case then all these diffs will be useless to you, far to long... i have a 4.3 in my race car with 13's which means its doing 170 at 8000 odd rpm in 4th 3.44 which is what it had in it made it almost impossible to get the car to 4th gear it wasnt powerful enough.

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Potato

But don't you have really big tyres, Meeni?

With 13s, they aren't all that bigger (if bigger at all??) in diametre.

The 12s on my Leyland are slightely bigger, than standard 10s with standard size tyres, but not by much. My 10x6 wheels have tyres very slightely smaller, just slightely.

So with 13s wouldn't they only be slightely bigger, therefore almost the same? Appart from being heavier, not allt hat different?

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

Are we talking max speed on a race track or Street
If track you would want max speed and Rpm's @ 200 or 100 of the Logest straigh or and division on the mutiple of straignts and then it does depend on the number of bend's before
its really a matter oif experiance of he trace and car set up
3.64 at a Guess

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

nah i have 12" mini lites

i want it for street use but still want power for people to ask wtf do u have in their

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