Discussion
My VXR 500(I love saying that bit) has just started to throw oil out through the dipstick. It seems only to happen at higher revs. Everything else is running fine and the oil level is just under max when warm. I've read on some other threads about oil surge on high speed bends (Ring etc). There is one particularly long right hander off a Mway roundabout that just begs for a bit of throttle and revving up through 2nd/3rd and into fourth and onto the straight bit before easing off. Would this be enough to cause the oil to surge and then suddenly come back onto the pump and blow out through dipstick? Will be speaking to Greens tomorrow. Just wondering if any one else has experienced anything similar. Going on a weeks touring hol in Cornwall next week and I really want my Ro to be on top form.
I have an early "500" and had the same problem. It turned out that the little rubber "O" ring around the dip stick had contracted and left the stick with very little resistance to being pushed out.
Greens changed the seal and put a clip on the stick as well (as fitted to later 500's I am told) and all has be fine for 4500miles.
As above take is easy until it is sorted!!!!!
Greens changed the seal and put a clip on the stick as well (as fitted to later 500's I am told) and all has be fine for 4500miles.
As above take is easy until it is sorted!!!!!
Ive always wondered how FI engines sort out crank pressure. Normally manifold vacuum draws it down, but with positive pressure in the manifold, where does the pressure go? .. out the dipstick hole? I guess if the dipstick is tight enough then there may be more pressure in the crankcase than the intake and all is well.
Or does it get rerouted to before the compressor in the kits?
Or does it get rerouted to before the compressor in the kits?
Thanks Rapidgb they were the words I didn't want to hear. I've just done a 4 mile run driving like a funeral director not above 1600 rpm and oil stayed in. If there was a ring or piston broken wouldn't I hear it on tickover?
Vlad - Yes my dipstick is very lose around the top as well I forgot to mention that earlier.
R5gttaz Sorry mate you've lost me.
Thanks every one for the response's.
Vlad - Yes my dipstick is very lose around the top as well I forgot to mention that earlier.
R5gttaz Sorry mate you've lost me.
Thanks every one for the response's.
To answer ringman all F1 and any other proper racing engines are drysumped, this means all crank case pressure is routed to the oil tank and then into the atmosphere.
On a 5psi blown LSX engine it should be ok to vent back to the throttle before the blower.
Over 7psi I always vent crank pressure to atmosphere to prevent oil and vapore causing detination.
Bearing in mind that all LSX engines untill the LS7 are under vented in the crank case,because the LS1,2&6 were originally designed to be dry summped and this lead to under venting.
When running 600bhpna and above I have always seen oil in the dip stick and detination due to oil in the inlet, when mapping a LSX engine with 680bhp for fitment in a ultima we saw oil in the rocker covers which when vented came up a tube over the oil filler a good 8inches this is called oil stand off, this is why we use cylinder heads with raised rocker covers and then cover spacers.(ETP,AFR.....etc)This was seen on an engine dyno at Peter Knights.
So if you are running boost more than low 5psi dont vent crank case to inlet.............
Just finished another one of our Monaro Projects, the car will have 600 bhp at the wheels from 402 engine and 3.3 whipple 12 psi...we have all the photos on build and video clips of the car at Bruntingthorpe when we were mapping with final dyno reports of output figures....the car drives a dream and the power output is awsome.....
On a 5psi blown LSX engine it should be ok to vent back to the throttle before the blower.
Over 7psi I always vent crank pressure to atmosphere to prevent oil and vapore causing detination.
Bearing in mind that all LSX engines untill the LS7 are under vented in the crank case,because the LS1,2&6 were originally designed to be dry summped and this lead to under venting.
When running 600bhpna and above I have always seen oil in the dip stick and detination due to oil in the inlet, when mapping a LSX engine with 680bhp for fitment in a ultima we saw oil in the rocker covers which when vented came up a tube over the oil filler a good 8inches this is called oil stand off, this is why we use cylinder heads with raised rocker covers and then cover spacers.(ETP,AFR.....etc)This was seen on an engine dyno at Peter Knights.
So if you are running boost more than low 5psi dont vent crank case to inlet.............
Just finished another one of our Monaro Projects, the car will have 600 bhp at the wheels from 402 engine and 3.3 whipple 12 psi...we have all the photos on build and video clips of the car at Bruntingthorpe when we were mapping with final dyno reports of output figures....the car drives a dream and the power output is awsome.....
I suggest you get it checked and the other chap with the VXR 500....lets hope it is only the dip stick as you say......But put it this way if it was one of our installations we would have the car transported back to us for appraisal. I know its not what you want to hear but if the car is still under warranty it worth checking...just to be safe.
Vlad the Impaler said:
I have an early "500" and had the same problem. It turned out that the little rubber "O" ring around the dip stick had contracted and left the stick with very little resistance to being pushed out.
Greens changed the seal and put a clip on the stick as well (as fitted to later 500's I am told) and all has be fine for 4500miles.
As above take is easy until it is sorted!!!!!
Greens changed the seal and put a clip on the stick as well (as fitted to later 500's I am told) and all has be fine for 4500miles.
As above take is easy until it is sorted!!!!!
Call the guys in the morning, but dont over worry.
broadslide said:
My VXR 500(I love saying that bit) has just started to throw oil out through the dipstick. It seems only to happen at higher revs. Everything else is running fine and the oil level is just under max when warm. I've read on some other threads about oil surge on high speed bends (Ring etc). There is one particularly long right hander off a Mway roundabout that just begs for a bit of throttle and revving up through 2nd/3rd and into fourth and onto the straight bit before easing off. Would this be enough to cause the oil to surge and then suddenly come back onto the pump and blow out through dipstick? Will be speaking to Greens tomorrow. Just wondering if any one else has experienced anything similar. Going on a weeks touring hol in Cornwall next week and I really want my Ro to be on top form.
Hope you have more luck than I did..........................nuff said!!
broadslide said:
Thanks Rapidgb they were the words I didn't want to hear. I've just done a 4 mile run driving like a funeral director not above 1600 rpm and oil stayed in. If there was a ring or piston broken wouldn't I hear it on tickover?
Vlad - Yes my dipstick is very lose around the top as well I forgot to mention that earlier.
R5gttaz Sorry mate you've lost me.
Thanks every one for the response's.
Yeah if its off boost then manifold will be sucking, on boost it will be blowing so low rpm no problem. Sustained hig RPM (Boost) will build crankcase pressure.Vlad - Yes my dipstick is very lose around the top as well I forgot to mention that earlier.
R5gttaz Sorry mate you've lost me.
Thanks every one for the response's.
Seems to be a bit of challenge in forced induction setups from what Ive read.
Stevieturbo what do you do with crankcase pressure?
I did not blow my engine up.
I discovered 8 fractured pistons, as they were not built to a suitable spec
I vent crankcase to atmos, and return any oil caught back to the sump. Zero maintenance, and zero hassle.
I see no sense in trying to bother running a PCV system like the Americans insist on trying to keep, and never being able to figure it out. They just cant seem to choose an easy approach, that works.
Although VTA strictly speaking wont keep the tree hugging types happy ( or Mr MOT man )
If you did have an extremely good oil/air separator setup, then you could still run a closed system, whereby crankcase fumes do indeed get re-circulated before the blower, with negligable oil introduced into the blower.
Far easier and cheaper to vent to atmos tho with a catch can for any oil ( you still need a decent oil/air sep tho )
I discovered 8 fractured pistons, as they were not built to a suitable spec
I vent crankcase to atmos, and return any oil caught back to the sump. Zero maintenance, and zero hassle.
I see no sense in trying to bother running a PCV system like the Americans insist on trying to keep, and never being able to figure it out. They just cant seem to choose an easy approach, that works.
Although VTA strictly speaking wont keep the tree hugging types happy ( or Mr MOT man )
If you did have an extremely good oil/air separator setup, then you could still run a closed system, whereby crankcase fumes do indeed get re-circulated before the blower, with negligable oil introduced into the blower.
Far easier and cheaper to vent to atmos tho with a catch can for any oil ( you still need a decent oil/air sep tho )
Edited by stevieturbo on Tuesday 28th August 00:40
ringram said:
Only 8 
Lucky you didnt fracture all of them, hehe.
Excellent opportunity to upgrade I guess.
if only funds allowed....Lucky you didnt fracture all of them, hehe.
Excellent opportunity to upgrade I guess.
Its costing me far too much just to repair !!!!! The LS2 option is what i wanted, but it would have ended up near double what it will be to repair my current block.
I can do that upgrade in the future.....a nice refreshed engine, with much higher CR should perform pretty well for now though :P
It would appear it was only the o ring around the dip stick not really seating itself properly. Put a bit of electrical tape around to get a good seal and all seems well. Checked for any excessive crankcase pressure and just done approx 600 miles down to Cornwall and back with the occainsional bit of spiririted driving (that she who must be obeyed would let me as she was riding shotgun). Anyway no more problems. Will speak to Greens next week to see if they need to change seal/dipstick or tube! I just love this car.
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