Thread: Flash Lube Valve Saver

Originally Posted by garrycol

Does each carby just feed fuel air mix to the side of the engine it is on or is there a common chamber at the start of the inlet manifold that then branches to the 8 cylinders.

Thanks

Garry

IIRC feed from one carby does 1,4,6 &7 and the other does 2,3,5 & 8


Martyn

I play around with LPG a bit for a living.
The life of the valves on LPG has alot to do with engine load as the heat soak factor of the slower burning fuel will destroy a valve quicker than the no lube factor of the fuel.
I personally believe if you are using dual fuel, add two stroke oil to the petrol side of things and use petrol for climbing hills and periods where sustained high power out puts are required.
a 101 pulling say a trailer of 2 tonnes and climbing ...say Mount Ousley with a high power output from the motor on LPG for a lenght of time will do in the valves , harden seats or not........valve lube or not.
For years I drove a old G60 Nissan patrol with a P40 motor with no valve inserts on LPG and did alot of heavy towing and no flash lube.
I never had a problem as i just used to take my time towing up hills etc until i let my father drive it up a mountain one day with a heavy load and valve seat recession was my friend.
Note most fork lifts converted to LPG have no valve seat inserts and survive very well because the motors are governed.
Flash lube will not hurt....but is not a complete answer as the way the motor is driven will matter more.
My under standing the manifold and heads on the 101 were the best rover had at the time and the motor was set up to run on poor fuels(why it has low compression and rich carby needles as standard).
The 101 motor was set up as a truck motor higher output at lower revs and not as a car motor.
I believe the heads are slightly different .
Remember unleaded fuel has little lube effect for valves , but alot of cast iron head motors are still running on the stuff without mods

If I was to fit flash lube to my 101, the way it has been done on garrys 101, would be the best way as the little vacuum port mentioned on the carby is near the butterfly and gives good mixing.
Both carbys need to be done and therefore the tee piece.
the other good spot is at the balance port which joints the vacuum of the two carbys.
The 5\8 UNF metal plug facing forward in the middle of the manifold between the carbys will acess this and will service all of the motor with flash lube.
( the balance port was the way I did my first LPG install with my 101 to supply the motor with gas )
It should also be noted the 101 standard manifold is slightly different to the other early rover V8s because of its army spec.

Originally Posted by Bushie

IIRC feed from one carby does 1,4,6 &7 and the other does 2,3,5 & 8


Martyn

Bugger - a visit to the shop to buy little brass connectors is now needed.

Garry

Originally Posted by 101 Ron

If I was to fit flash lube to my 101, the way it has been done on garrys 101, would be the best way as the little vacuum port mentioned on the carby is near the butterfly and gives good mixing.
Both carbys need to be done and therefore the tee piece.
the other good spot is at the balance port which joints the vacuum of the two carbys.

I want to run an air line for a vacuum gauge and the only remaining and logical spot is the balance tube between the carbies but this is the flash lube sucker hence the question do I really need the flash lube. On the balance of views it probably doesn't need it but it might do a little good.

So I will get a X piece in so that the carbies still balance, it still sucks the flash lube and the suction will work the vacuum gauge.

Garry

My 101 has been changed slightly fron normal.
If you look at this pic you will see a L shaped pipe going into the centre of the manifold between the carbys.( my LPG inlet).........the standard fitting is a large metal plug which can be drilled and tapped to 1/8 bsp for a hose nipple.
the plug is the balance chamber and is a good vacuum supply and even distribution of flash lube if required.

Current set up with the standard black plug in place right hand side centre.

Originally Posted by 101 Ron

Thanks Ron - I do not have that centre plug drilled, tapped and plugged. You indicted that your gas goes in there - so that chamber must be feed by fuel air mix from both carbies when on petrol - therefore feeds all combustion chambers with common mix.

In your pic, you will note the pipe just to the right on the passenger side side carby - I have this but it is also replicated on the drivers side carby so there is a small balance pipe between the bases of two carbies.

I have changed this so the flash lube goes in the passenger carby in the pipe you have on yours and the vacuum gauge being run off the vacuum off the drivers carb in a hold that is not on yours.

If the chamber under that centre plug is common to both carbs then the flash lube will go to all cylinders, likewise the vacuum off the the drivers carb will also be balanced vacuum and not that from just the drivers side of the engine.

I thought you had "gas" rings under each carb - but I take it your gas just goes into the central chamber.

Garry