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Re: Tuning MGA vs. MGB

To: WSpohn4@aol.com, mgs@autox.team.net
Subject: Re: Tuning MGA vs. MGB
From: Howard gentry <zymmer4@yahoo.com>
Date: Thu, 26 Sep 2002 08:09:10 -0700 (PDT)
--- WSpohn4@aol.com wrote:
> In a message dated 9/26/02 7:24:12 AM Pacific
> Daylight Time, 
> owner-mgs-digest@autox.team.net writes:
> 
> 
> 
> No point guessing about rear wheel power - it's the
> performance that tells 
> the tale,and with the low weight of the Elva, yours
> was certainly going to be 
> pretty good.
> I have also run 12.5:1 1622s and they do indeed make
> a snappy engine, 
> although not as much so as my Twincam (clocked top
> speed 131 mph at a local 
> venue).
> 
> 
> >      
> >      So, to those out there who have tuned both
> the B
> > and the A MG engines...Is the 1622cc engine easier
> to
> > tune to say 120 HP at the flywheel than the 1800
> cc
> > engine?   Just wondering.
> > 
> 
> No, it really just follows the displacement. If you
> do exactly the same thing 
> to an 1800 as you did to a 1622, you can expect more
> torque, and around 10% 
> more power, although you usually get slightly less
> than the arithmetic 
> increase. In other words, if you increase
> displacement by 15%, don't be 
> surprised inf the output only increases, say, 12%.
> 
> 
> I am probably in the minority on this one, but I
> have a lingering fondness 
> for the 1963-65 3 main bearing MGB engine (heck -
> I'll bet many on the group 
> have never even seen one of these!), which IMHO
> actually produces a tad more 
> power than the identical 5 main bearing version,
> despite what they quoted in 
> the factory ratings (you didn't think they'd quote a
> LOWER output for their 
> brand new 5 main, did you?), and is certainly a
> snappier, more free-running 
> engine.  I use one of these in my Mk 2 Coupe on the
> street.
> 
> Bill

     Bill,
   Your remarks are right on the money here. And, that
early 1800 B engine did go very well. I lived in
England for several years in the early 70's. There
were many early B's running on the road then. They
went very well. The engine just seemed to pull better.
Howard
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