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#Post#: 102404--------------------------------------------------
Fuel and oil consumption
By: Cookie7354 Date: July 30, 2017, 5:23 am
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Morning all. I'm sure this has been asked before but even after
a search I'm still non the wiser. My S111 fuel consumption is
approx 200-220 miles per tank and the oil is about 2 litres
every 500 miles. I know the valve stem seals need replacing as
its smoky on start up then clear unless idling for a whilst then
clears on acceleration. New head will be on its way eventually
but just trying to see if the fuel consumption is correct?
Many thanks
Rich
#Post#: 102406--------------------------------------------------
Re: Fuel and oil consumption
By: pintofale Date: July 31, 2017, 2:32 am
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Which engine? Which fuel?
#Post#: 102410--------------------------------------------------
Re: Fuel and oil consumption
By: Cookie7354 Date: July 31, 2017, 10:28 am
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Oops sorry, 2 and1/4 petrol
Regards
Rich
#Post#: 102411--------------------------------------------------
Re: Fuel and oil consumption
By: towhitch Date: July 31, 2017, 2:36 pm
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I think you would do well to carry out a compression test. My
2.25 petrol was shot and needed a rebore long before it got to 2
ltr of oil every 500 miles :giddy:
#Post#: 102412--------------------------------------------------
Re: Fuel and oil consumption
By: Sunny Jim Date: August 1, 2017, 5:07 pm
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That petrol consumption is not bad. I put a Turner head on mine
in 1997 because of worn valve guides (symptoms similar to
yours).
I have just removed the engine for replacement nearly 20 years
later!
It is worth a compression test before lifting the head though.
You can then assess the bore wear when the head comes off.
It the compression is OK, all fine and dandy. If the compression
is low, but the bores aren't bad, you can hone them and fit new
piston rings (normally with a stepped top ring to avoid any
ridge at the top of the bore). Another thing to look for is
chuffing from the rocker cover vent - mine was like a dragon's
nostrils, hence replacement!
You can do all of this without taking the engine out, but it is
a bit of a pain, and then you may as well replace all the
bearings!
Sunny Jim
#Post#: 102413--------------------------------------------------
Re: Fuel and oil consumption
By: pintofale Date: August 3, 2017, 4:19 am
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Jim, can you explain rocker vent chuffing please?
#Post#: 102414--------------------------------------------------
Re: Fuel and oil consumption
By: Cookie7354 Date: August 3, 2017, 8:17 am
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Many thanks for all your replies - compression test it is :o
#Post#: 102415--------------------------------------------------
Re: Fuel and oil consumption
By: Sunny Jim Date: August 3, 2017, 5:02 pm
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[quote]Jim, can you explain rocker vent chuffing please?[/quote]
When you get blow by of the piston rings with wear, you get
pressure build up in the crank case. As this gets worse you will
hear it chuffing through the rocker cover breather and oil
filler depending what versions you have on your engine. In my
case, the end stage was a continuous stream of smoke from the
rocker cover vent - it has two forward facing vent slots in it,
hence the dragons nostril analogy. I 'cured' this for a time by
fitting a Series 3 type vent with a pipe to the air intake in
the carburettor elbow.
Sunny Jim
#Post#: 102420--------------------------------------------------
Re: Fuel and oil consumption
By: NoelC Date: August 14, 2017, 2:44 am
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It's difficult to say whether your fuel consumption is good, bad
or indifferent Rich as you don't say what series you own. There
are 3 different fuel tank sizes. 10 imp gal front fill (88/109)
or 11 imp gal and 15 imp gal rear fill (109).
#Post#: 102423--------------------------------------------------
Re: Fuel and oil consumption
By: Cookie7354 Date: August 14, 2017, 4:06 pm
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Hi
Noel it's the front fill series 3 88"
Thanks
Rich
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