The 6 speed box is narrower as it has twin output shafts (internally)
with 3 gears on each rather than one shaft with 5 (or 6) gears on.
6th is about the same ratio as 5th on a 5 speed box so unless you like
changing gear or have an engine with a narrow power band i don't think
it's worth it.
Jim
On 08/05/2020 23:29, 'JR' via Quantum Owners Group wrote:
Thanks for the pics Russ - very nice - looks like a super neat
conversion. From your info the it sounds like there is about 6.5mm
total clearance with a zetec blacktop + BC/IB5 gerabox (3mm each
side). I am expecting to have to fabricate some mounting hardware
(never seen any advertised for Mk2 Fiesta conversion) and do exhaust
mods. The IB5 with rear mount starter also sounds the best way to go -
the front mount motor on cvh is too close to exhaust (XR2) even with
short version motor.. I thought the 6 speed box might be wider but Jim
has posted that it is actually narrower - still too much effort to fit
though.
John
On Friday, 8 May 2020 12:02:19 UTC+1, russ price wrote:
Looks like the engine/gearbox has moved fractionaly to the n/s,
clearance is now less than 1/2 mm on gearbox end and 6mm at the
other. The engine mounts now fitted came with car, offhand i can't
remember the make but they aren't Ford, i'm pretty sure i saw
receipt for £50+ for just one. A number parts came with car for
upgrades, not all fitted but they are all quite expensive and seem
to be good quality. Gearbox is IB5 with rear starter motor,
thought about 6 speed but decided not worth the trouble. If you go
to imgbb i've put some pics in folder ST170 :-
https://vitesse.imgbb.com/albums <https://vitesse.imgbb.com/albums>
Russ
On Friday, May 8, 2020 at 9:34:32 AM UTC+1, JR wrote:
1mm clearance sounds super tight! - you must have some really
good engine mounts to stop that hitting. Do you have a 6 speed
box or BC/IB5? Front or rear starter motor? On my cvh + BC 5
spd there is better clearance than 1mm on gearbox end. Maybe
fiitting a zetec blacktop needs the whole of the power unit
moving slightly towards nearside to make it fit?
With regards induction I will be using a cvh efi./turbo up and
over alloy inlet manifold with some adapter plates (single
throttle body) - this should make it easier to move to turbo
later once the basic conversion has been sorted. Had a re-read
of nickp;s thread - thanks for reminder.
John
On Thursday, May 7, 2020 at 10:37:53 AM UTC+1, russ price wrote:
In that case it is the same size as the ST engine fitted
in mine. I didn't do the conversion but i had to change
the engine so have some idea of how it's done. The
clearance at the crankpulley end is quite tight but it is
possible without cutting anything, clearance at the
gearbox end is even worse 1mm only. I'll take and post
some pics later, The exhaust has had some work done to
squeeze it in. The biggest problem however is on the
induction side i don't see how it would be possible to use
the original system, mine is running on bike carbs and
that still a bit of a squeeze. Engine mounts need to be
pretty firm and a head steady is a good idea. Just
realised the topic started by the chap who did the
conversion is still on proboards forum take a look at
ST170 Saloon posted by nickp.
Russ
On Tuesday, May 5, 2020 at 3:41:57 PM UTC+1, JR wrote:
Looking to replace my saloon cvh lump with a 2 litre
zetec blacktop motor. Anyone have any experience of
this... tips.problems . pointers etc?
Most of the info I have found relates to using the old
silvertop zetec engine - I won'r be using one of those
(too old/rare/expensive in comparison to plentiful
cheap blacktops)
I don't see any problems with manifolds, loom,
injection, ecu etc. (I will be using aftermarket ecu/efi)
Biggest problem I see is very tight fit/access in
engine bay at crank pulley/cambelt end. Ideally I do
not want to be cutting inner panel.
John
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