[Healeys] SU Needles & OIL ( or lack of )

[Michael]

Hi Keith,
Can't help you much on #1
But regarding bearing clatter on startup my engine does the same thing as yours on the first start of the day. 
The engine has very few miles on it since I "freshened" it last winter.
I Plastigaged (spell check sure doesn't like that one) and the Glacier rod and main shells were all well within spec. 
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.
I have removed and rechecked the original filter assembly and everything seems to be fine.
BTW my MGBGT does exactly the same thing.
I suspect that it is not a problem but would like to hear others CONSTRUCTIVE input.
Michael S
BN1 #174



-----Original Message-----
From: "Oudesluys" <coudesluijs at chello.nl>
Sent: ‎24/‎06/‎2015 3:50 a.m.
To: "healeys at autox.team.net" <healeys at autox.team.net>
Subject: Re: [Healeys] SU Needles & OIL ( or lack of )

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?

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?

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.
Other causes can be:
faulty/absent non return valve in the oil filter
small leak in the suction part of the oil pump circuit

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.

Kees Oudesluijs


Keith Taylor schreef op 24-6-2015 om 8:36:

G'Day 


Problem 1 


 I have a BN2 with Le Mans upgrades ,  1 3/4 carbys with OA6 needles & the car is running very rich,
I have ordered weaker OA8 needles hoping to sort out this problem . However this car has flat top pistons hence much higher compression .
Am I going down the right road .


Problem 2


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 
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
 to get oil pressure up then fire up , Subsequent startups are not a problem


Keith Taylor
Southern Highlands OZ


BN1
BN2

 

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