82 replies to this topic

[timmy850]

Nope, engine has to come out to swap the gearbox. The gearbox is the bit that has the engine mounts onto the subframe

[nicklouse]

as above. consider it as a single power unit not as a seperate engine and box.

[Dusky]

Guessworks will pop in to say hé has heard it being done, and I ve seen people do it next to a track to save the waterless coolant (did have a flipfront on that car tho) but it basicaly takes much longer than just popping the engine out

[Guess-Works.com]

Guessworks will pop in to say hé has heard it being done, and I ve seen people do it next to a track to save the waterless coolant (did have a flipfront on that car tho) but it basicaly takes much longer than just popping the engine out

 

Yes I've seen it done... but what a ball ache

 

By the time you've taken the clutch cover and transfer case off, the engine would have been on the bench.

[Spider]

Understatement of the week;-

 

 

Yes I've seen it done... but what a ball ache

 

 

I think understanding the lady folk would be easier (no offence to the lady folk, just keep in mind we're only blokes)

[ryomini]

Cheers lads

I may have a wee project in the pipe line for yas all to laugh at.

I think I kind of have a better opinion on this subject now

[ac427]

Are the actual straight cut to helical tranmission losses stated anywhere,  I thought it would be more than 1% ?

[BMC649]

I have a very odd set of roller bearing drop gears.

Primary gear 19 teeth
Idler gear 24 teeth
Input gear 19 teeth.

Are these A+ or pre A+?
What ratio are these? 1:1?

Pic attached.
Thanks.  20151113_210253.jpg   45.81K   16 downloads  20151113_210225.jpg   43.33K   8 downloads

[Guess-Works.com]

A series

[Spider]

I have a very odd set of roller bearing drop gears.

Primary gear 19 teeth
Idler gear 24 teeth
Input gear 19 teeth.

Are these A+ or pre A+?
What ratio are these? 1:1?

Pic attached.
Thanks.20151113_210253.jpg20151113_210225.jpg

 

Ratio is 1:1

 

A series

 

Without opening the picture, i'd say GW has suggested this due to the shaft size for the Idler Gear.

[MRA]

Are the actual straight cut to helical tranmission losses stated anywhere,  I thought it would be more than 1% ?

 

Lol where did you get 1% from ?  its been proven over the years that the losses are between 10 to 15%

[MRA]

The power output, the type of cam and your own requirements dictate whether a SCCR gear kit are worth having, in my opinion you will be driving a Mini not a rolls royce so a little extra noise is not too much of an issue, as you increase the FDR the gears "spread out" so if you have the power and torque to close them up a little you can fit a SCCR. 

As is the norm for 16V heads, turbos etc of recent years a Mini with a 3.44 or lower would be rubbish to drive as you would spend the majority of time trying to keep it on the road every time you accelerated all you would get is tyre smoke and possibly a ditch or two.

 

For example 200 bhp turbo power on 13" with a 3.11:1 FDR in top will wheel spin at 60+ mph when it comes on boost, where as 34 bhp (std 850) would not do any such thing even if you dropped the clutch at rest with 5000 rpm, you have to weigh up the pro's and cons of every aspect, and apply Engineering logic to every aspect.

[ac427]

 

Are the actual straight cut to helical tranmission losses stated anywhere,  I thought it would be more than 1% ?

 

Lol where did you get 1% from ?  its been proven over the years that the losses are between 10 to 15%

 

 

Post 34

[MRA]

 

 

Are the actual straight cut to helical tranmission losses stated anywhere,  I thought it would be more than 1% ?

 

Lol where did you get 1% from ?  its been proven over the years that the losses are between 10 to 15%

 

 

Post 34

 

 

Anyone who has driven and rolling roaded a Mini before and after fitting SCCR will know that the wheel BHP increases by 10 to 15% dependant on how many of your helical gears are changed, ie Transfer, main and final drive gears will give you a higher percentage than if only your main gearset are changed.

[Spider]

10 to 15%? Sorry, can't say I've ever seen that much of a gain.

 

That sounds like an awful lot of power to be grinding in to the thrust washers, do you think they'd stand up to that?

 

These days with modern cars, they are trying to drag every ounce of gain and minimise every gram of losses, I've of no doubt that if the losses from Helical gears were as high as 5% they'd go to Herringbone gears to reduce the loses while keeping their drive trains quiet.

 

<EDIT: Perhaps if the gearbox was poorly assembled, had poor alignment etc, it will suffer high losses with Helicals than Straights. The sky's the limit here.>

Edited by Moke Spider, 29 June 2016 - 10:54 AM.