can't confirm that they go off tune quickly, what should be the reason for
that? This is a mechanical unit, only off tune is wear on the lobes. I'd
just change the metering unit. other chances for running badly are leaking
injectors, always worth a shot.
Cheers, Gernot
OH, I meant to say, get some SU's, I'll take the pi off you for say 50 quid
as its not working properly, ok? Fifty quid will get you a set of SU's in
exchange.
> ----------
> From: David Hill[SMTP:DavHill@email.msn.com]
> Reply To: David Hill
> Sent: Friday, February 19, 1999 10:58 PM
> To: Triumphs Mailing List
> Subject: PI vs Carbs
>
>
> I have a choice concerning my car and I'd appreciate any collective or
> collected wisdom....
>
> The car is a 1972 2.5PI Saloon, with the 134bhp fuel injection system.
> The
> system is currently still wrong, making the car run on less than all
> cylinders. The cause appears to be the metering unit seals breaking up and
> passing into the injectors, jamming them. Although a little noisy on start
> up-probably endfloat- the pump has never vapour-locked or caused any
> problem. Currently, though, I can only lose the 'misfire' feeling for
> about
> twenty minutes after I've stripped and cleaned the injectors.
> Consequently,
> the output feels nothing like 134 bhp.
>
> The choice I have is to either fit a reconditioned, unleaded spec.
> metering
> unit and have the injectors cleaned and calibrated.
> Incidentally, I'm told the unleaded specs MUs just have improved
> seals/diaphragm, the standard rotor can cope with unleaded fuel. My
> injectors were reconditioned at 37,000 miles and the car has now done
> 58,000.
>
> The alternative is to recondition and fit a pair of SU HS6's and manifold
> which came off my 2.5S donor car.
>
> Each option would probably cost about the same.
>
> What concerns me is that I have spoken to several owners/enthusiasts re.
> PI.
> Every one has mentioned that the PI system is great when it's working but
> that it goes off tune very quickly, i.e. in a couple of hundred miles.
> Also,
> many PIs were converted to SUs, apparently for the same reason.
>
> The opposing school of thought says that carbs will drastically cut power
> and are far less effective.
>
> For my part, I have driven a Mk.1 2000, whose power delivery was
> consistently silky smooth-which made me envious. However, at 90bhp, this
> car
> did feel underpowered.
>
> So, does anybody have experience of these things? Can anyone give me pros
> and cons?
>
> Any information/opinions gratefully received.
>
> David Hill
>
>
>
>
>
|