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FWIW I don't notice any sort of clatter on first start-up in either
my BN2 or BJ8. The BN2 is a fresh rebuild, and the the BJ8 has in
the neighborhood of 100K miles on it. I don't think 'clatter' is
normal, but offhand don't know what would cause it (it's usually
associated with engines with hydraulic lifters that are bleeding
down).<br>
<br>
As for the too rich problem, I think you want to run on the rich
side with higher compression. With the flat top pistons, what kind
of compression are you getting? A richer mixture will help prevent
detonation (to a point).<br>
<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 6/24/2015 5:12 AM, Michael wrote:<br>
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<div style="font-family: Calibri,sans-serif; font-size: 11pt;">Hi
Keith,<br>
Can't help you much on #1<br>
But regarding bearing clatter on startup my engine does the
same thing as yours on the first start of the day. <br>
The engine has very few miles on it since I "freshened" it
last winter.<br>
I Plastigaged (spell check sure doesn't like that one) and the
Glacier rod and main shells were all well within spec. <br>
The oil pressure with VR1 20/50 is 55p.s.i. hot at 3000 RPM
and the only time I hear the clatter is on the first start of
the day.<br>
I have removed and rechecked the original filter assembly and
everything seems to be fine.<br>
BTW my MGBGT does exactly the same thing.<br>
I suspect that it is not a problem but would like to hear
others CONSTRUCTIVE input.<br>
Michael S<br>
BN1 #174<br>
<br>
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<hr><span style="font-family: Calibri,sans-serif; font-size:
11pt; font-weight: bold;">From: </span><span
style="font-family: Calibri,sans-serif; font-size: 11pt;"><a
moz-do-not-send="true" href="mailto:coudesluijs@chello.nl">Oudesluys</a></span><br>
<span style="font-family: Calibri,sans-serif; font-size: 11pt;
font-weight: bold;">Sent: </span><span style="font-family:
Calibri,sans-serif; font-size: 11pt;">24/06/2015 3:50 a.m.</span><br>
<span style="font-family: Calibri,sans-serif; font-size: 11pt;
font-weight: bold;">To: </span><span style="font-family:
Calibri,sans-serif; font-size: 11pt;"><a
moz-do-not-send="true" href="mailto:healeys@autox.team.net">healeys@autox.team.net</a></span><br>
<span style="font-family: Calibri,sans-serif; font-size: 11pt;
font-weight: bold;">Subject: </span><span style="font-family:
Calibri,sans-serif; font-size: 11pt;">Re: [Healeys] SU Needles
& OIL ( or lack of )</span><br>
<br>
</div>
<div class="moz-cite-prefix">Problem 1: How do you know the engine
is running rich? Is it OK at idling (blue on the ColorTune:
correct, orange: rich), are the plugs black after a long
stretch?<br>
<br>
Problem 2: What is your oil pressure at say 2500rpm and at idle
when the engine is really hot after a long high speed run. Is
the oil pressure slightly dipping when you blip the engine when
hot?<br>
<br>
If at start up after only one night you can actually hear the
bearings rumbling/rattling I would suspect worn bearings or, but
unlikely, the wrong oil (way to thin) if you are lucky.<br>
Other causes can be:<br>
faulty/absent non return valve in the oil filter<br>
small leak in the suction part of the oil pump circuit<br>
<br>
Never start a cold engine using the throttle to rev it up
immediately after firing. Let it idle until you read oil
pressure. On my JH car it can take over 20 seconds before I have
oil pressure.<br>
<br>
Kees Oudesluijs<br>
<br>
<br>
Keith Taylor schreef op 24-6-2015 om 8:36:<br>
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<div>G'Day </div>
<div><br>
</div>
<div>Problem 1 </div>
<div><br>
</div>
<div> I have a BN2 with Le Mans upgrades , 1 3/4 carbys with
OA6 needles & the car is running very rich,</div>
<div>I have ordered weaker OA8 needles hoping to sort out this
problem . However this car has flat top pistons hence much
higher compression .</div>
<div>Am I going down the right road .</div>
<div><br>
</div>
<div>Problem 2</div>
<div><br>
</div>
<div>This car left standing overnight ,on startup has a severe
bearing rattle , my long time mechanic ( retired, read old
ex BMC man) is of the opinion </div>
<div>that the spin off filter non-return is failing The oil
release valve seems to be in good condition. Startup now is
to crank over without starting</div>
<div> to get oil pressure up then fire up , Subsequent
startups are not a problem</div>
<div><br>
</div>
<div>Keith Taylor</div>
<div>Southern Highlands OZ</div>
<div><br>
</div>
<div>BN1</div>
<div>BN2</div>
</div>
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