Why does No. 4 oil up first?

[Jeffds1360]

Not getting out much in the 13/60, just the odd short run. Yesterday only 3 cylinders firing on start up. Took ages to clear to 4. Checked this afternoon (after blood test pre chemo tomorrow) and found No. 4 all oiled up...... why that one?

Coldest?

What's your analysis guys?

[RogerH]

Hi Jeff,

 I suspect my 'answer' is not the 'the' answer.

#4 is usually the hottest pot - shielded from the rad fan by the other pots.

#4 is also nearest to the rocker oil feed. There may be more oil escaping the rocker assembly and then getting into the inlet valve guide.

#3, 2, 1 is getting less and less oil to them.

 

Roger

[NonMember]

No 4 is nearest to the rocker oil feed, so the most likely to suffer leakage past the valve stems, as Roger just beat me to saying

[daverclasper]

just an idea?, the unburnt fuel then washes the oil off and it then sparks and fires up? 

[Jeffds1360]

Thanks folks. Coldest....of course and I was unaware that the oil feed came from the rear! Interesting. I will monitor my valve guides. My compressions are all good at +/- 2%

No4 does fire up after a few minutes so I suspect Dave is right.

Too cold today for any maintenance. 

[Pete Lewis]

and with all the misfire problems with fouled unglazed plugs it would be worth changing as once they cough out or soot up recovery seems unlikely

it can be just oiled as its not firing correctly 

Pete

[RogerH]

If it is oil coming down the valve guide then there is a side issue.

The oil will mix with the petrol intake and lower the RON. So if you are using 95 then it may be much lower, 93 perhaps, and bring on pinking.

Also TRy using a hotter spark plug to help keep the plugs clean.

 

Roger