tomcat59alan
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L322 Flashlube
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No sign of that on mine.
I've done some reading up and many suggest it isn't necessary more important that the system is specced and set up correctly. That said, they aren't that expensive so might just fit one anyway.
Need to get the gas checked out anyway as I don't think the vaporizer is big enough for mine. If I give it the beans, it drops back on to petrol.
I've done some reading up and many suggest it isn't necessary more important that the system is specced and set up correctly. That said, they aren't that expensive so might just fit one anyway.
Need to get the gas checked out anyway as I don't think the vaporizer is big enough for mine. If I give it the beans, it drops back on to petrol.
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Have you gone over to the dark side? @tomcat59alan
tomcat59alan
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Ahhhh...... Any preference yet? Or are both a PITA?Certainly not, I've got one of each.
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Dropping back to petrol could also mean the filters are clogged up....vap maybe specced OK, but with clogged filters it can't pull enough gas through them to keep up!
tomcat59alan
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Hi Dan just to clarify, they are both P38's l only put the 322 prefix as that what the original poster was inquiring about.I'm still running about in the weasel, I bought the petrol because it had a new gearbox and engine fitted, only 4k miles before the owner parked it up. Originally 4ltr but fitted with a 4.6. I did loads of work on it to get it MOT'ed but then had three strokes and a seizure which have meant its been parked up again.
tomcat59alan
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Thanks Ant, I'm guessing you aee replying to myrunning out of get up and go thread, that was on the diesel, fuel and air filters cured that. Ta.
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Oh Alan, I am so sorry to have made such a faux-pas. I hope you are recovering well.
My previous 4.6 P38 had the LR approved LandiRenzo LPG system fitted, but no flashlube system. I never had problems warranting a head-off to see the condition of the valve-seats so I assumed it was ok.
tomcat59alan
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Not a problem Dan, getting there slowly, everything takes do much longer these day's.
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Dunno about that. Every Jag v8 I have ever heard of has either had flashlube fitted or gone bang. I'd fit it for peace of mind if nothing else.
Yes, that's my plan. That said, the previous owner claims he's done 50k miles without so I guess I'll be needing new heads soon!
Anyone know of any warning signs of valve seat regression?
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The most common misconception you'll hear about LPG is that it makes an engine run hotter than Petrol. This is nothing but heresay
LPG has only 85% of the calorific value of the same amount of petrol, so it is impossible for it to create more heat. It can only make 85% as much.
There is one factor missing though The cooling effect that spraying petrol mist into the cylinder has on the valves. The evaporating petrol mist will cool the valves very slightly but that cannot happen when injecting a gas that has already been vaporised before injection. When running on LPG the gas does not have quite as much cooling effect on the valves. As a result of this difference you see LPG injection showing slightly higher valve temperatures.
Jaguar V8 Valves are not the best kind for LPG as the soft valve seats will not resist Brinelling and Erosion.
Flashlube Is an Oil that is pulled in through vaccum and it mists the valve seats to "cool" them, negating VSR..
VSR is the valve seat sealing face shrinking upwards into the cylinder head. When this occurs, the valve heads and stems are pulled further up into the cylinder head in order to meet the shrunken valve seats You could think of this as a kind of valve sealing self-adjustment.
Eventually, the point is reached where the valve head and stem has moved up so far that the top of the valve stem is touching the cam follower, tappet or whatever for all of the time. There should be a clearance gap here which normally ensures full and correct sealing of the valve. If there is no clearance gap, the valve may be held slightly open by the contact with the cam follower or tappet. If this happens the cylinder involved cannot be truly gas tight and the condition will result in the affected cylinder producing far less than its normal power, or producing no power at all. This is because the affected cylinder will have low or no compression due to the VSR..
LPG has only 85% of the calorific value of the same amount of petrol, so it is impossible for it to create more heat. It can only make 85% as much.
There is one factor missing though The cooling effect that spraying petrol mist into the cylinder has on the valves. The evaporating petrol mist will cool the valves very slightly but that cannot happen when injecting a gas that has already been vaporised before injection. When running on LPG the gas does not have quite as much cooling effect on the valves. As a result of this difference you see LPG injection showing slightly higher valve temperatures.
Jaguar V8 Valves are not the best kind for LPG as the soft valve seats will not resist Brinelling and Erosion.
Flashlube Is an Oil that is pulled in through vaccum and it mists the valve seats to "cool" them, negating VSR..
VSR is the valve seat sealing face shrinking upwards into the cylinder head. When this occurs, the valve heads and stems are pulled further up into the cylinder head in order to meet the shrunken valve seats You could think of this as a kind of valve sealing self-adjustment.
Eventually, the point is reached where the valve head and stem has moved up so far that the top of the valve stem is touching the cam follower, tappet or whatever for all of the time. There should be a clearance gap here which normally ensures full and correct sealing of the valve. If there is no clearance gap, the valve may be held slightly open by the contact with the cam follower or tappet. If this happens the cylinder involved cannot be truly gas tight and the condition will result in the affected cylinder producing far less than its normal power, or producing no power at all. This is because the affected cylinder will have low or no compression due to the VSR..
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tomcat59alan
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Piece of pi $$ looking at my installation.
