34 replies to this topic

[minilee94]

Right okay I'm very quickly getting the hump with this crap buying bits then having to have to fitted then played with by a machine shop pissing me right of now

[Fast Ivan]

you need this  http://www.minispare...A3240.aspx|Back to

 

a press to fit it, a micrometer to measure your crank, a lathe to bore it out to the correct clearance, make sure its clocked in before boring, concentricity being the key here, a machine shop will be able to do all of this no problems.

 

to be fair you would be taking a chance buying a second hand unit and it being ready to fit with the correct clearance for your crank, that said the one sold to you is clearly scrap

[minilee94]

So when you buy a set of new straight cut drops how do people just fit them and that it because its bullish!t paying £300 for gears then paying to get them bored out

Or will it be different story as my crank is brand new

[Fast Ivan]

well I'm not sure about new straight cut drops and if they need machining but a used second hand one is going to have some kind of wear....

 

as an example: I bought a new X pin diff and I ended up replacing the bush as it had to much clearance, slack as f***, so even when buying new I wouldnt assume its a case of fit and forget, it should be but it isn't always

[minilee94]

Right okay well I might just buy a new set of drops and go from there £250 for a new set

[Fast Ivan]

go for it

I would still be doing some measuring before they went together though, new or not

[Artful Dodger]

For that sort of thing id not buy second hand anyway.. You have no idea of condition and it could be cracked! I got a set and crack detected it at work- was scrap metal.. It would have thrown teeth around in about 10mins of running!

New- is always cheaper in the long run!

[minilee94]

Yeah true well il measure my crank then look in to some new drop gears

[Cooperman]

Engineering is about measuring, calculating and machining.

If you don't do it then you will end up with a very poor end result.

There are so many variants of parts for Minis, like different pistons and piston dish volumes, different transfer gear cases, different con-rods, the list goes on and on. With any classic car you have an old designed product range so everything must be measured and 'engineered' to be sure it will work properly.

The alternative is a modern car.

[minilee94]

Well my crank is brand new and if I buy new drop gears surely try will fit nicely

Obv I will still measure it but that's bill crap buying a crank or drop gears and having more work done just for it to fit

[Artful Dodger]

Why do you think people pay Other people to build and engineer their cars for them?

Because everything has to be done right and engineered properly! I don't think I have fitted a part to any of our race cars that just bolts on, everything always gets modified, or made to fit

[Fast Ivan]

Well my crank is brand new and if I buy new drop gears surely try will fit nicely
 

 

it might do

but think about this; you fit a new bush and have it machined then it will definitly fit and cost a whole lot less

[minilee94]

Having it machined and a new bush fitted I dout will be much less than a set of new straight cut drops

[Fast Ivan]

it will be cheaper and will fit correctly

[The Matt]

You'd have to get a new straight cut primary gear checked and then possibly machined too.  You should really get a second hand one checked even if it looked perfect.  The reason there are so many badly built engines out there is that people are just buying second hand performance parts and then slapping them together and turning the key.

Then you also get the "I can build you a race engine for £500" type.  It's this sort of detail that is often/always overlooked and then causes problems later on.