Hi
I have been told to get a fiesta Si 1800 BC type gear box, higher fist gear and a more suitable
final drive
got one from a scrap yard, they said this is an 1800.

using a spare clutch plate and tipex marks i get about three point eight revolutions to one on the
drive shafts. this may well be a Si 1800 box but how do i prove it
before i have it renovated, new seals etc,
can any one help with any data about the gears and final drive ratios,
or any ID marks.
thanks
andy

I havent got the number with me now, but next time I am down the yard I can check my RS1800 for the number.

Not got exact ratio's but all I can say is that it'll do more top end than an si box (eg. end of clocks), and you can do 65-70 in second thrashing it

why do you want an rs1800 box anyway? particular reason? if its mpg you want its derv box all the way

_________________
Daily isn't so Special. And it makes me sad.
Need space and time and I'll crack on with Jams si!

Catch me on Facebook as I'm rarely on here.

Thanks Happypaul
I have the derv box in at the moment.
its in a "SYLVA Mojo 2".
I am hoping for more responsiveness.
I cant get maximum revs in top, and to get a quick start i have to slip the clutch
then its not bad in the other gears
but i take the point about fuel consumption
it was an Si 1800 I was told to look for. Is it different to a RS 1800
Thanks Andysmac

they didn't do a Si 1800

Si's are either 1.4 8v's or 1.6 16v zetec's the only 2 1800 fiesta's are the 1.8 16v xr2i and the rs1800

_________________
Daily isn't so Special. And it makes me sad.
Need space and time and I'll crack on with Jams si!

Catch me on Facebook as I'm rarely on here.

Thank you Lads for your help and advice
andysmac

_________________
Daily isn't so Special. And it makes me sad.
Need space and time and I'll crack on with Jams si!

Catch me on Facebook as I'm rarely on here.

_________________

Some people are like slinkies. Not really good for anything, but bring a smile to your face when pushed down the stairs!

From the moment I picked up your book until I laid it down, I was convulsed with laughter. Some day I intend reading it.

i owned/occasionally drive one

u can get escort si's in a 1.8, not sure if the box will fit tho?

_________________





Rip Ben Elvin (jam)

i think they will fit in a fez if its got a front mounted starter motor

what exactly is this gearbox going into?

edit:-

SYLVA Mojo 2 = http://www.sylva.co.uk/ is it that?

It seams i was given mixed and wrong advice, sorry boys.
I went down to swanley in Kent this mourning and saw a chap named
Phil stewart a gear box repair and rebuild guy. very helpful
He showed me the empty casing/bell housing of the box i need its the older BC Type.
looking into the box from the engine there is a two inch +- round piece of casting at
about 8 o'clock. below the splined clutch shaft.
the correct box for me has a small core type plug inside this 2 inch casting, 5p size
also the casing around the bottom, below the speedo take off is larger and square.
I dont have any numbers or any thing to explain it, I will have to see for myself.

I am waiting to look at a RS 1800, when the engine comes out, this may be a candidate.
My Car is a Mojo 2 with a Vulcan 1600 CVH on Jenvey's and an Emerald ECU. derv gear box
5th gear is about 80 mph @ 3000 rpm a little to high, but good MPG
About 120 bhp at the moment, most other bits bits are from my old XR2.
regards andysmac