Thread: Dismantled 3.5 litre Rover V8

Some more info....the spark plugs at no time were ever oily, certainly nothing wet and black nor were the insulators ever oily.

The engine breather which vents the lifter gallery never showed any oil contamination nor did oil ever exit via the dip stick tube.

The front oil seal which was of the rope type never leaked nor did oil under pressure ever exit via any other seal.

Ron.

Originally Posted by justinc

Frank, don't forget with this engine, some degree of detonation would've also contributed to the blowby and big end shell wear, my 10.5:1 will knock its head off , although way better after I regraphed the dizzy and ran PULP. Still worth running the hi comp pistons though as it had a real 'crack' to it on blipping the loud pedal, and was a joy to drive
I'm still amazed it didn't hop a tooth on the timing chain

JC

JC, I agree that sort of CR would certainly have contributed to the wear, I would have opened up the combustion chambers by unshrouding the valves and laid it open a bit around the flame travel area, which would have dropped it to about 10:1 and then modified the dissy to suit, would have got rid of the ping, wonder where all of the bits off the timing chain sprocket ended up, Regards Frank.

He fitted composite gaskets which would have been the same as adding 20 thou which would have dropped the CR about 0.5 of a CR ie from 10.5 to 10 :1.
Regards Philip A

Tank wrote,..

If you stick with good oil, filters, air and oil, and stick to manufacturers instructions on service's you should get a lot more klms than you got with this one.

Hello Frank,

Are you implying that changing the oil more frequently than the stated change interval of every 10,000km or 6 months will lead to reduced engine life?

The change interval for the factory air cleaners was every 20,000km or 12 months or every 10,000km or 6 months if used in dusty conditions.

Ron.

Originally Posted by RoverP6B

Tank wrote,..

Hello Frank,

Are you implying that changing the oil more frequently than the stated change interval of every 10,000km or 6 months will lead to reduced engine life?

The change interval for the factory air cleaners was every 20,000km or 12 months or every 10,000km or 6 months if used in dusty conditions.

Ron.

Frank??
I too would be interested in the answer to this

Originally Posted by djam1

Frank??
I too would be interested in the answer to this

I think Rick130 could give you a definitive answer on this.
But I'm a great believer in companies like Land Rover and Shell and Caltex et al who have done millions of $ worth of research on what oils to use and what intervals that oil should be changed at, modern oils, esp. Synthetics are so superior to oils 40 years ago, oils ain't oil as they say.
I think that the question that needs answering is what great benefit is derived from changing your oil at 3K to 4K, when the experts LR and the oil companies state 10K or even 20K in some cars is the CORRECT time to change the oil and you can bet that there is a Safety Factor embedded in there as well.
When I owned trucks (Diesel) driving interstate and clocking 5K/week I used to change the oil and filters every week (5K). It involved 60L of oil, 3 oil filters, 2 fuel filters costing around $250 (eq. $600 now). Then came a service bulletin from Mack Trucks that a new oil (Shell I think) would extend oil changes to 10K, so I took the advice of the people who should know and changed oils. Oil analysis showed no difference in engine protection and decreased wear. So these companies, who have nothing to gain by you buying less of their oils, continue to produce longer life oils and I for one believe it is a total waste of money, time and resources to discard oil that has not reached it's correct oil change Klms, Regards Frank.

But changing oils early won't give shorter engine life...

Oil was changed typically every 2500 miles (4000km) or less, oil filter every second change..ie 8000km or less.

I think this might have more the issue.
However even then the filters should not have been clogged.
Another issue may be how long in time between changes.
If a car is left lying around and only doing short trips, this is defined in service manuals as "extreme" use, and oil change intervals reduced to time not distance. eg my Honda Jazz calls for 6months OR 10KK.

Regard sPhilip A