On 2 Nov 2004 Andy Dingley wrote:

Whatever happend to Jack Knight ? Last I heard they were working on
an all-mechanical non-viscous torque-splitting diff that felt like a
viscous diff, but wasn't. Worked well, but it turned nasty once there
was any wear in it.

They're still very much in business down in Woking. I have a JKD 5-speed
box on my Mini Marcos. It's the helical touring box. They also do 5- and
6-speed cross-cut dog boxes for racing. Another Mini Marcos won the
"Fastest Mini In The World" title at Silverstone this year with a 5-port
A-series engine and Jack Knight gearbox, beating all sorts of exotic
stuff (and BMW MINIs).

--
Richard Porter
Mail to username ricp at domain minijem.plus.com
"You can't have Windows without pains."

"Dave Plowman (News)" wrote in message
...
In article ,
G&M wrote:
I very much doubt it. It was barely up to handling the torque of the
original Mini. Later ones were beefed up.

That was the old 1.5 litre F1 and it only had to last 3 hours. I expect
the parts were selected and heat treated though.

Right. Of course you could completely replace the internals.

That's where things headed in 1961, and once Lotus got their act in gear,
even removing material, and hence weight, from those gears.

On 2 Nov 2004 "G&M" wrote:


"Dave Plowman (News)" wrote:
G&M wrote:
I very much doubt it. It was barely up to handling the torque
of the original Mini. Later ones were beefed up.

That was the old 1.5 litre F1 and it only had to last 3 hours. I
expect the parts were selected and heat treated though.

Right. Of course you could completely replace the internals.

That's where things headed in 1961, and once Lotus got their act in
gear, even removing material, and hence weight, from those gears.

I thought they mostly used Hewland boxes?

--
Richard Porter
Mail to username ricp at domain minijem.plus.com
"You can't have Windows without pains."

"Richard Porter" wrote in message
...
On 2 Nov 2004 "G&M" wrote:


"Dave Plowman (News)" wrote:
G&M wrote:
I very much doubt it. It was barely up to handling the torque
of the original Mini. Later ones were beefed up.

That was the old 1.5 litre F1 and it only had to last 3 hours. I
expect the parts were selected and heat treated though.

Right. Of course you could completely replace the internals.

That's where things headed in 1961, and once Lotus got their act in
gear, even removing material, and hence weight, from those gears.

I thought they mostly used Hewland boxes?

Once Hewland released their first ubiquitous F1 box (the F100 I think) then
that's right. And of course later on the Cossie/Hewland became the basis of
most cars other than the Ferrari.

Though Lotus did try their own one again with the 69, 78 and 86/88. The 78
also had a locked diff.