455 LSX Oil Consumption Issue
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Teching In
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455 LSX Oil Consumption Issue Hello All-
I have a friend who had a beast of a motor installed in his 2007 Corvette coupe about 18 months ago.
Here are the specs on the motor:
GM LSX Block (455c.i.)
Callies 4.250 Forged Crankshaft
4.130 Diamond Pistons
Callies 6.100 Rods
ARP 2000 Rod Bolts
Race Main and Rod Bearings
Warhawk LSX 235cc Heads (Heads have been ported and polished)
Comp Cam 242/244 .620 114lsa
Comp R lifters
Comp Cam Chromemoly pushrods
Rollermaster timing chain
Melling Hi-Flo Oil Pump
MTI XCelerator Intake
Ported Fast 90mm
Ported TB
Kook’s 1 7/8” Long Tube Headers
3” Hi-Flo Catted Mid Section
Corsa Sport Exhaust (Quad Tips)
NGK TR6 Spark Plugs
MSD Plug Wires
Underdrive Pulley
160 Thermostat
He has had (and still has) a few gremlins to work out of the motor.
The one I am concerned with at the moment is that he tells me since he had the oil changed a month (~400) miles ago (doesn't get driven much), it has consumed a quart and a half of oil!
It doesn't seem to be leaking it (the motor is practically brand new and has less than 5K miles on it). I would really hope it isn't consuming it, but that will be determined later.
The oil has to be going somewhere. If it is an internal issue either the rings or valve stem seals aren't sealing, and I will perform a leak down test sooner or later to try and determine this.
The other possibility that crossed my mind is that maybe there is a PCV issue. Has anyone on here seen huge amounts of oil consumed due to this? Again, this is a custom-built LSX block.
Any other ideas?
I have a friend who had a beast of a motor installed in his 2007 Corvette coupe about 18 months ago.
Here are the specs on the motor:
GM LSX Block (455c.i.)
Callies 4.250 Forged Crankshaft
4.130 Diamond Pistons
Callies 6.100 Rods
ARP 2000 Rod Bolts
Race Main and Rod Bearings
Warhawk LSX 235cc Heads (Heads have been ported and polished)
Comp Cam 242/244 .620 114lsa
Comp R lifters
Comp Cam Chromemoly pushrods
Rollermaster timing chain
Melling Hi-Flo Oil Pump
MTI XCelerator Intake
Ported Fast 90mm
Ported TB
Kook’s 1 7/8” Long Tube Headers
3” Hi-Flo Catted Mid Section
Corsa Sport Exhaust (Quad Tips)
NGK TR6 Spark Plugs
MSD Plug Wires
Underdrive Pulley
160 Thermostat
He has had (and still has) a few gremlins to work out of the motor.
The one I am concerned with at the moment is that he tells me since he had the oil changed a month (~400) miles ago (doesn't get driven much), it has consumed a quart and a half of oil!
It doesn't seem to be leaking it (the motor is practically brand new and has less than 5K miles on it). I would really hope it isn't consuming it, but that will be determined later.
The oil has to be going somewhere. If it is an internal issue either the rings or valve stem seals aren't sealing, and I will perform a leak down test sooner or later to try and determine this.
The other possibility that crossed my mind is that maybe there is a PCV issue. Has anyone on here seen huge amounts of oil consumed due to this? Again, this is a custom-built LSX block.
Any other ideas?
It doesn't seem to be leaking it, but that will be determined later.
The oil has to be going somewhere. If it is an internal issue
The oil has to be going somewhere. If it is an internal issue
There's only 2 places it can go, and at that rate like I said there will be very clear signs of where it goes.
Thats a terribly long stroke for how short the cylinders are on the LSX iron block. If his builder didn't put the proper piston ring combo in there, its a build issue. Happens alot with long strokes. He shouldn;'t have gone more than 4.125". Preferably a 4.1". 4.0 is great.
.
.
TECH Addict
Joined: Jun 2009
Posts: 2,012
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From: Tulsa, OK
That engine is old.....the rings were seated in a couple miles after it first ran.
Unless they had it running pig rich right from the get go and "gas washed" the rings and they never seated properly. I know people that have screwed up their tunes and had just that issue. Had to rebuild it to fix the oil burning after just a month or two.
.
Unless they had it running pig rich right from the get go and "gas washed" the rings and they never seated properly. I know people that have screwed up their tunes and had just that issue. Had to rebuild it to fix the oil burning after just a month or two.
.
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Thread Starter
Teching In
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That engine is old.....the rings were seated in a couple miles after it first ran.
Unless they had it running pig rich right from the get go and "gas washed" the rings and they never seated properly. I know people that have screwed up their tunes and had just that issue. Had to rebuild it to fix the oil burning after just a month or two.
.
Unless they had it running pig rich right from the get go and "gas washed" the rings and they never seated properly. I know people that have screwed up their tunes and had just that issue. Had to rebuild it to fix the oil burning after just a month or two.
.
...This would explain the chugging at low rpm...The car has since been retuned.Oh, another great find: the throttle plate has a hole drilled in it...As we all know that is the lazy man's way of tuning or you are no good at tuning in the first place...These are modern engines with electronic throttle bodies, people!
Did a compression test yesterday, and the numbers aren't bad. One of the cylinders (still has good pressure) had a good amount of oil on the spark plug, though...Weird
The intake manifold is full of oil, so here is my plan of action...
1) Get an FSM and verify the PCV hose routing and make sure the valve is operating properly (not gummed up)
2) Add a crank case breather and a catch can to help meter how much oil is coming through
3) Properly break in the engine, which should have been done in the first place.
Whaddya all think?
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Teching In
Joined: Dec 2008
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Thats a terribly long stroke for how short the cylinders are on the LSX iron block. If his builder didn't put the proper piston ring combo in there, its a build issue. Happens alot with long strokes. He shouldn;'t have gone more than 4.125". Preferably a 4.1". 4.0 is great.
.
.
The motor is 4.250 x 4.130
Apparently, the motor was never "broken in." Break-in oil, or even non-synthetic was never run to let the rings seat. In addition to that, the tune was recently changed after it was found the A/F ratio was running as rich as 8 or 9:1 in some instances ...This would explain the chugging at low rpm...The car has since been retuned.
Oh, another great find: the throttle plate has a hole drilled in it...As we all know that is the lazy man's way of tuning or you are no good at tuning in the first place...These are modern engines with electronic throttle bodies, people!
Did a compression test yesterday, and the numbers aren't bad. One of the cylinders (still has good pressure) had a good amount of oil on the spark plug, though...Weird
The intake manifold is full of oil, so here is my plan of action...
1) Get an FSM and verify the PCV hose routing and make sure the valve is operating properly (not gummed up)
2) Add a crank case breather and a catch can to help meter how much oil is coming through
3) Properly break in the engine, which should have been done in the first place.
Whaddya all think?
...This would explain the chugging at low rpm...The car has since been retuned.Oh, another great find: the throttle plate has a hole drilled in it...As we all know that is the lazy man's way of tuning or you are no good at tuning in the first place...These are modern engines with electronic throttle bodies, people!
Did a compression test yesterday, and the numbers aren't bad. One of the cylinders (still has good pressure) had a good amount of oil on the spark plug, though...Weird
The intake manifold is full of oil, so here is my plan of action...
1) Get an FSM and verify the PCV hose routing and make sure the valve is operating properly (not gummed up)
2) Add a crank case breather and a catch can to help meter how much oil is coming through
3) Properly break in the engine, which should have been done in the first place.
Whaddya all think?
Do some research on Catch can setups. Most of the catch can's you will find for LSX's don't work very well. I know of two or three people with big name brand setups with all lines ran correctly that still get a full quart of consumption that doesn't stop in the can every 2,000-3,000 miles. RevExtreme used to be a sponsor here and their setup works great. In all honesty you need a dual can setup on these cars to catch ALL of the oil.
Teching In
Joined: Nov 2006
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From: Houston, Tx
Ben, while the oil consumption is notibily high, the car is not burning 2 quarts of oil within one tank of fuel or every 200 miles.
Thread Starter
Teching In
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