[Healeys] fuel consumption

[m.g.sharp at sympatico.ca]

Thanks Roland and Jim,  Since Jim brought up fuel and ethanol, I should add that I only use Shell 91 which has zero ethanol.  Ethanol will marginally reduce gas mileage.  Also, I run my tyres with 30lbs of pressure.

 

I did a Google search on fuel consumption in Healeys and it seemed that it should be around 18-20 mpg (imperial), however a poster from Germany reported getting about 10.5 in the first 1000 miles after rebuild but after a few thousand miles and more carb tuning he about doubled it.  Maybe I ought to be patient.  I have been driving it gently, certainly for the first 500 miles.  Perhaps I need to thrash it a bit!  Mike – do I have you permission?

 

When I was 20 and had just bought it I could fill the tank with Esso Extra at the station where I worked for under $7 (cdn).  I filled up yesterday with still a quarter of a tank left and it cost me $97+.  Damn scary.

 

I’m looking forward to more comments – I still think it 10.1 is exceptionally low, even taking into account the rebuild.

 

From: Roland Wilhelmy <sentenac.rw at gmail.com> 
Sent: July 3, 2022 3:54 AM
To: m.g.sharp at sympatico.ca
Cc: Healey List <healeys at autox.team.net>
Subject: Re: [Healeys] fuel consumption

 

I would suggest that you put another 1000 miles on the car and then do another mileage check. A new engine may have a lot of extra friction and other possibilities. 

 

-Roland

 

On Sat, Jul 2, 2022, 5:57 PM <m.g.sharp at sympatico.ca <mailto:m.g.sharp at sympatico.ca> > wrote:

Hi listers,  As you might recall, I just had the engine rebuilt on my BT7 last year.  I only have 670 miles on it so far.  My fuel consumption seems exceptionally 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 Imperial 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 anything 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 “hunt” 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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