I would think the 1mm clearance on the gearbox end is because the engine
and gearbox has been moved across that way to give enough clearance on
the crank pulleys and belts.
The Zetec cylinder blocks are the same width as the CVH, it's just them
having flat belts for the auxiliarys instead of V belts that causes the
clearance issues.
In the 2+2 you can modify the steel frame rails, the saloon isn't so easy.
With the silver top Zetec in my saloon i converted the alternator to V
belts and replaced the water pump with an electric one.
That let me keep the engine and gearbox in the same place as a CVH
The ST170 6 speed gearbox is actually narrower then the BC/IB5 so it
would let you move the engine/gearbox across to the gearbox side.
But, it uses unique driveshaft joints on the inner end so you would need
to get custom shafts made.
It is also hydraulic clutch and cable gearchange so a lot of work.
Jim
On 07/05/2020 20:34, 'JR' via Quantum Owners Group 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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