[Mgs] Timing discussion

[mghirsch at netzero.net]

You also have to realize that factory specs are a compromise.  They are trying to balance performance, mileage engine life and in modern cars, emissions.  You can tune it for, let's say  mileage, but performance will suffer.  Conversely, if you tune it for performance mileage will suffer.  Tune it the way you want it to run.

---------- Original Message ----------
From: Richard Lindsay via Mgs <mgs at autox.team.net>
To: Charley38 at twc.com
Cc: "mgs at autox.team.net List" <mgs at autox.team.net>
Subject: Re: [Mgs] Timing discussion
Date: Wed, 24 Apr 2019 10:26:49 -0500


Awesome Charley. No factory manual is going to adequately prescribe the right answer for your FrankenMGB. You must love engine building as much as do I. R

On Wed, Apr 24, 2019, 8:41 AM Charley Robinson <Charley38 at twc.com> wrote:That comment,  "Just advance the timing until you notice preignition."  
 has to be taken in the context of how much advance can you dial in 
 before it starts to ping under load.   It's a rough attempt to dial in a 
 particular engine/fuel combination.  I think most of us know the trial 
 and error method.
 
 To answer your question: My B engine is set at ~12* advance @ 850 - 900 
 RPM with the vac disconnected.  It pulls well through the midrange  set 
 that way.  But my engine kind of "parts is parts." It's a 18V block with 
 GH innards (flat -top pistons).  All this topped by a pre-smog head and 
 HS-4 carbs.  So I had to tweak it to get it to run the way I like it on 
 mid-grade gas.
 
 CR
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