Hi Paul,
Thanks for the response. By 'should' I mean for better performance and
driveability. If I were going 'by the book' I'd be hunting up a Z-S, etc. The
car came with the HS4's, a rather worn 25D4 and a (now defunct) exhaust system.
Thanks again.
Bud Krueger
Paul Hunt wrote:
> -----Original Message-----
> From: Paul Hunt <paul.hunt1@virgin.net>
> To: Bud Krueger <bkrueger@ici.net>
> Cc: MG List <mgs@autox.team.net>
> Date: 26 November 1998 19:55
> Subject: Re: 25D4 vs 45D4
>
> >Bud Krueger wrote:
> >>
> >> A bit of advice, please. My '77MGB has HS4's and an early twin downpipe
> exhaust
> >> system (once I get around to installing it). I will be using a Pertronix
> >> ignition system. My problem is this: I have a 25D4 and a 45D4 available
> to
> >> me. Which one should I use? Why? TIA.
> >
> >Depends what you mean by 'should'. If you mean 'by the book' then
> >probably the 45D4. However, almost every change to the carburation and
> >ignition systems on the B throughout its life were emissions related,
> >each change reducing performance to varying degrees. Therefore the 25D4
> >will probably give performance closer to the original, but the
> >carburation, combustion and exhaust characteristics of your particular
> >car will all have a bearing on how successful the substitution will be.
> >
> >PaulH.
> >
> >
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