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I suspect a bust either in your measurements or your math. Doubling the fue=
l consumption would necessarily entail an extremely rich mixture, assuming =
the fuel is not going somewhere else than the combustion chambers. An imper=
ial gallon is approximately 20 percent larger than a US gallon so your conv=
ersion would seem to be backwards. Are you sure you were not measuring US g=
allons in which case your imperial mileage would be closer to 12 mpg. Still=
not good but more logical. At this point I would throw out the existing d=
ata and start over.
Bill Lawrence
BN1#554
________________________________
From: Healeys <healeys-bounces@autox.team.net> on behalf of Bob Spidell <bs=
pidell@comcast.net>
Sent: Sunday, July 3, 2022 3:17 PM
To: healeys@autox.team.net <healeys@autox.team.net>
Subject: Re: [Healeys] fuel consumption
A friend and I used to take a long road trip--up to 5,000 miles--in my BJ8 =
every year for over 20 years. He checked our mileage at every fuel stop--us=
eful if your gas gauge goes on the fritz--and I checked the odometer agains=
t the roadside markers (it was spot on). Through three engines the mileage =
stayed very nearly the same: 15MPUSG in stop-and-go city driving, best I go=
t was 25 on 'slow' (55MPH), flat highway driving (eastern Oregon, when the =
troopers used to enforce it) and at freeway speeds (70-75MPH) I got around =
18. When I went from the 3.9 rear end to a 3.54 I expected a mileage 'bonu=
s,' but at most I got a tenth or two better MPG.
29.6 miles per USG is extraordinary; these conversations come around every =
few years and no on ever claimed much more than I was getting.
wrote:
Hi listers, As you might recall, I just had the engine rebuilt on my BT7 l=
ast year. I only have 670 miles on it so far. My fuel consumption seems e=
xceptionally high. I have just checked on one fill up, and need to repeat =
to be more certain, but on the last tank I got an awful 10.1 miles to the I=
mperial Gallon (14.8 miles/US gal). I used to get about double that.
I have checked the tune on the carbs using the usual method and checked it =
with a quick plug check (I have yet to do a proper plug chop), and if anyt=
hing I think I am running a bit on the lean side. The exhaust seems good, =
just rich when the choke is on, however the engine does =93hunt=94 a little=
when at idle. It runs beautifully otherwise. No fuel leaks at all.
My questions: 1) what are others getting for fuel consumption? And 2) any =
thoughts on how to improve it?
Thank all - Mirek
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<div style=3D"font-family: inherit; font-size: inherit; color: inherit;"></=
div>
<div style=3D"font-family: inherit; font-size: inherit; color: inherit;">I =
suspect a bust either in your measurements or your math. Doubling the fuel =
consumption would necessarily entail an extremely rich mixture, assuming th=
e fuel is not going somewhere else
than the combustion chambers. An imperial gallon is approximately 20 perce=
nt larger than a US gallon so your conversion would seem to be backwards. A=
re you sure you were not measuring US gallons in which case your imperial m=
ileage would be closer to 12 mpg.
Still not good but more logical. At this point I would throw out the=
existing data and start over.</div>
<div style=3D"font-family: inherit; font-size: inherit; color: inherit;"><b=
r>
</div>
<div style=3D"font-family: inherit; font-size: inherit; color: inherit;">Bi=
ll Lawrence</div>
<div style=3D"font-family: inherit; font-size: inherit; color: inherit;">BN=
1#554</div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Healeys <healeys-b=
ounces@autox.team.net> on behalf of Bob Spidell <bspidell@comcast.net=
><br>
<b>Sent:</b> Sunday, July 3, 2022 3:17 PM<br>
<b>To:</b> healeys@autox.team.net <healeys@autox.team.net><br>
<b>Subject:</b> Re: [Healeys] fuel consumption</font>
<div> </div>
</div>
<div>A friend and I used to take a long road trip--up to 5,000 miles--in my=
BJ8 every year for over 20 years. He checked our mileage at every fuel sto=
p--useful if your gas gauge goes on the fritz--and I checked the odometer a=
gainst the roadside markers (it
was spot on). Through three engines the mileage stayed very nearly the sam=
e: 15MPUSG in stop-and-go city driving, best I got was 25 on 'slow' (55MPH)=
, flat highway driving (eastern Oregon, when the troopers used to enforce i=
t) and at freeway speeds (70-75MPH)
I got around 18. When I went from the 3.9 rear end to a 3.54 I expec=
ted a mileage 'bonus,' but at most I got a tenth or two better MPG.<br>
<br>
29.6 miles per USG is extraordinary; these conversations come around every =
few years and no on ever claimed much more than I was getting.
<br>
<br>
<br>
<div class=3D"x_moz-cite-prefix">On 7/2/2022 8:48 PM, <a class=3D"x_moz-txt=
-link-abbreviated" href=3D"mailto:m.g.sharp@sympatico.ca";>
m.g.sharp@sympatico.ca</a> wrote:<br>
</div>
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<p class=3D"x_MsoNormal">Hi listers, As you might recall, I just had =
the engine rebuilt on my BT7 last year. I only have 670 miles on it s=
o far. My fuel consumption seems exceptionally high. I have jus=
t checked on one fill up, and need to repeat to be more
certain, but on the last tank I got an awful 10.1 miles to the Imperial Ga=
llon (14.8 miles/US gal). I used to get about double that.<br>
<br>
I have checked the tune on the carbs using the usual method and checked it =
with a quick plug check (I have yet to do a proper plug chop), and if=
anything I think I am running a bit on the lean side. The exhaust se=
ems good, just rich when the choke is on,
however the engine does =93hunt=94 a little when at idle. It runs be=
autifully otherwise. No fuel leaks at all.</p>
<p class=3D"x_MsoNormal"> </p>
<p class=3D"x_MsoNormal">My questions: 1) what are others getting for=
fuel consumption? And 2) any thoughts on how to improve it?</p>
<p class=3D"x_MsoNormal"> </p>
<p class=3D"x_MsoNormal">Thank all - Mirek</p>
</div>
<br>
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<br>
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