I agree with keeping the 4/203 in place, but it sounds as if it's
definitely
going to have to have Rangie diffs fitted.
I'm not sure what you would define as "high revs" for a 4/203 but, if
peak
power is at 2600rpm, I assume you probably mean anything over about 2400
rpm?
Am I right in my assumption that, with 32" tyres, 3.54 diffs give about
23mph/1000rpm in top gear, and about 29mph/1000rpm in overdrive top?
If so, that should give me about 32mph in top and 40mph in overdrive top
at
the 1400 rpm peak torque.
And presumably enable me to keep up with the trucks on the motorway at
around 60mph with just over 2000rpm in overdrive top, or 2500 rpm in
direct
top, both of which are hopefully well below what you call "high revs"?
Simon
"Oily" <martinhill100@[EMAIL PROTECTED]
> wrote in message
news:QdadnXXyIoEkevLVnZ2dnUVZ8t_inZ2d@[EMAIL PROTECTED]
>
> "Simon Oates" <zz_oates@[EMAIL PROTECTED]
> wrote in message
> news:486f7db4$1_2@[EMAIL PROTECTED]
>> Thanks Martin.
>>
>> The Perkins is already in a 1968 2A 109" station wagon I have acquired
>> but
>> which is not yet roadworthy, hence my question about the likely fuel
>> consumption as it's going to be a while before I can check it myself.
>>
>> The 109 currently has a Series III gearbox with overdrive, both of
which
>> seem to be in good order, and what look like standard Series diffs.
>>
>> I've picked up a workshop manual for the 4.203 and that tells me it
> develops
>> 60bhp at 2600rpm, with max torque coming in at 1400rpm so I would guess
> that
>> at the moment it's good for no more than 55mph flat out, even with the
>> overdrive engaged.
>
> That's a pretty accurate guesstimate, just working off the figures,
> especially having no experience of the engine, but it will definitely
cope
> with 3.54:1 diffs.
>
>>
>> I can therefore well understand the attractions of Rangie diffs, but as
> it's
>> a LWB, I'm also contemplating diffs from a Rover P4, preferably the
3.9
>> ones out of the Rover 95 if I can find a couple of good ones, or
possibly
>> the 4.3 ones from the other P4s, but I doubt the 4.3 ones will be
>> sufficiently different from the standard ones . What do you think?
>>
>> The engine sounds good (reminding me very much of the sound of a Massey
>> Ferguson 35 tractor), starts instantly and does not smoke, so I think
>> I'll
>> leave it in there for a while and see how it goes.
>>
>> The other option would be to swap it for a Prima diesel as I have a
spare
>> one kicking around, or possibly a 200TDI with the turbo removed, but I
> think
>> I'll live with the Perkins for now until I see how much of my budget
the
>> work on the rest of the vehicle absorbs.
>>
>> Thanks again.
>> Simon
>>
> The 4/203 will outlast the Prima IMHO and the 200 Tdi without the turbo
is
> lacking in power. Seeing as it's already fitted and working well I would
> stay with it but put the high diffs in, the 4/203 doesn't last or like
it
> if
> held at high revs for long periods but will last forever if the speed is
> kept down and the torque destroys series gearboxes if abused with the
> bigger
> Perkins engines. The only problem with the engine is the price of parts,
> but
> used properly you will never need any.
>
> Martin
>
>
|
