Discussion
sounds like a rebuild, but look on the bright side engine mods 
start making your list 
2 sheds said:
How much oil is being consumed ?
As boosted suggested, if its not smoking it must be "dripping" somewhere.
hope its something simple.
Tim
The engine was new and did already have a list of "mods" done to it .. lightened flywheel, solid lifters, x-bolted, steel pushrods, Wild CAM, STage-3 heads... it has only done 1700 miles, and has burnt oil all its life. At first I put it down to running it in, but it's getting through about 3 pints per 100 miles or so (cruising at 80 - 100mph). There are no signs of oil leaks on the garage floor. (since new, I have put in almost 9 litres of oil in the engine)
Fingers are crossed its not terminal (although it is under warrenty)... watch this space .. updates as soon as I get a synopsis from Peninsula
Early diagnosis shows good compression on all cylinders, wet test is also good (whatever that is).
No oilseals leaking, bearings or gaskets leaking, and no oil in the coolant.
Suspect possible piston ring failure... engine is off to V8Developments for further inspection, rectification next week.
No oilseals leaking, bearings or gaskets leaking, and no oil in the coolant.
Suspect possible piston ring failure... engine is off to V8Developments for further inspection, rectification next week.
If all compressions are OK then I'm not sure how a failed piston ring wouldn't show up.
not got a hole in the sump has it or if you've got a oil cooler its not got a hole in it 
Seriously though if its burnig it, doesn't it show up as a very high HC reading on a gas analyser/ emmissions test
.
Assuming V8D built it in the first place, I don't think they get many returned so just one of those things then
not got a hole in the sump has it or if you've got a oil cooler its not got a hole in it Seriously though if its burnig it, doesn't it show up as a very high HC reading on a gas analyser/ emmissions test
. Assuming V8D built it in the first place, I don't think they get many returned so just one of those things then
If the rings haven't bedded in properly they may not be sealing properly, so it would blow oil out the breather. The breather is normally plumbed into the inlet manifold so the oil gets burnt. I think its quite common for new engines to blow a little while they're being run in, but I couldn't say what constitutes 'a little'. My 4.6 didn't consume much oil while it was being run in.
greenv8s said:
If the rings haven't bedded in properly they may not be sealing properly, so it would blow oil out the breather. The breather is normally plumbed into the inlet manifold so the oil gets burnt. I think its quite common for new engines to blow a little while they're being run in, but I couldn't say what constitutes 'a little'. My 4.6 didn't consume much oil while it was being run in.
Oh yeah
! That might be the job - break the glaze on the cylinder bores for a nice scratchy, crosshatchy finish. Hadn't thought of that...Could be - if the surface finish of the cylinder bores is not right when the engine build takes place then the piston rings don't bed in. The final finish is normally acheived by honing to give a roughened, cross hatch effect that (I think) allows some oil retention in the valleys to lubricate the passage of the piston.
Anyway, remember when I were a lad an engine coming back with this problem and I was given the job of dropping out the pistons and "breaking up the glaze" with diagonal strokes of roughish wet and dry. Did the trick as I recall.
Nel
Anyway, remember when I were a lad an engine coming back with this problem and I was given the job of dropping out the pistons and "breaking up the glaze" with diagonal strokes of roughish wet and dry. Did the trick as I recall.
Nel
OK Engine Update ... The guys at V8 Developments have I believe found the problem of excessive oil consumption and low power output.
Valve guides ... detatched and very very worn (1700 miles from new).
They are re-doing the heads, and the engine should be back with me within the next 2 weeks
>> Edited by jvaughan on Friday 30th April 19:47
Valve guides ... detatched and very very worn (1700 miles from new).
They are re-doing the heads, and the engine should be back with me within the next 2 weeks
>> Edited by jvaughan on Friday 30th April 19:47
jvaughan said:
OK Engine Update ... The guys at V8 Developments have I believe found the problem of excessive oil consumption and low power output.
Valve guides ... detatched and very very worn (1700 miles from new).
They are re-doing the heads, and the engine should be back with me within the next 2 weeks
>> Edited by jvaughan on Friday 30th April 19:47
Glad it's getting sorted, but did you have the heads done by them before?
HarryW said:
Jason were they the Stage III ones from them
Harry
Yes, they were stage III heads. This problem though has been with me from the start (+- 50 miles), so no worries I guess about them suddenly going. Still, im sure the guys at V8 Dev would sort you "IF" they were to develop a fault, I have been assured it is a one off case.
all that will remain is for me to drive the car everyday to work for a month to run the engine in before Le Mans
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