I'm posting this in FI because I think my issue is certainly made worse by FI.
I've a dedicated track car that runs on the zetec powerplant. I had recently bought a second built motor (my primary spun a rod bearing and spent some time at the machine shop) which has some issues.
The motor:
JE 9:1 pistons, eagle rods, massive speed ported head, crower springs and FI cams, ARP hardware. Running SVT JRSC BBK (slotted to fit the zetec).
The problem:
Running a road racing event this past weekend, for the first time with this blower (the motor ran two events previously very mildly boosted ~4psi) at full boost I found I'm burning about 1/3qt of oil for every 20min race session...so A LOT of oil. There was power but not as much as I would've expected from an M62 at full boost. I ran the weekend (~10 sessions) and burned through about 3 quarts. When I got home I ran a compression test with nothing obvious, but then I got to a leakdown test and it is when it got weird...
I ran the test several times on a warm motor (on TDC for each cylinder) and set the pressures at 5psi and then at 10psi (with everything connected). The reading by cylinder are as follows:
5psi
Cyl1: 28%
Cyl2: 40%
Cyl3: 25%
Cyl4: 40%
10psi
Cyl1: 1-2%
Cyl2: 20%
Cyl3: 0%
Cyl4: 20%
I didn't bother running much above 10psi since the readings drop off.
When connected to either cylinder 2 or 4, there's plenty of air leaking noise out of exhaust, at the throttle body and there's air flow coming out of the other cylinder (if connected to 2, air is coming from 4 and vice versa).
My question. Does this all seem like just a head gasket issue or should I be worried about the rings as well? I suspect that because I'm moving air from a cylinder at TDC to a cylinder that's got valves open, i may just be hearing air on exhaust and intake due to it passing that way rather than having valve issues. The main reason I'm asking is because I'm trying to figure out if I should be pulling the motor or if there's a decent chance just pulling the head will get me what I need. Any input / opinions much appreciated.
I've a dedicated track car that runs on the zetec powerplant. I had recently bought a second built motor (my primary spun a rod bearing and spent some time at the machine shop) which has some issues.
The motor:
JE 9:1 pistons, eagle rods, massive speed ported head, crower springs and FI cams, ARP hardware. Running SVT JRSC BBK (slotted to fit the zetec).
The problem:
Running a road racing event this past weekend, for the first time with this blower (the motor ran two events previously very mildly boosted ~4psi) at full boost I found I'm burning about 1/3qt of oil for every 20min race session...so A LOT of oil. There was power but not as much as I would've expected from an M62 at full boost. I ran the weekend (~10 sessions) and burned through about 3 quarts. When I got home I ran a compression test with nothing obvious, but then I got to a leakdown test and it is when it got weird...
I ran the test several times on a warm motor (on TDC for each cylinder) and set the pressures at 5psi and then at 10psi (with everything connected). The reading by cylinder are as follows:
5psi
Cyl1: 28%
Cyl2: 40%
Cyl3: 25%
Cyl4: 40%
10psi
Cyl1: 1-2%
Cyl2: 20%
Cyl3: 0%
Cyl4: 20%
I didn't bother running much above 10psi since the readings drop off.
When connected to either cylinder 2 or 4, there's plenty of air leaking noise out of exhaust, at the throttle body and there's air flow coming out of the other cylinder (if connected to 2, air is coming from 4 and vice versa).
My question. Does this all seem like just a head gasket issue or should I be worried about the rings as well? I suspect that because I'm moving air from a cylinder at TDC to a cylinder that's got valves open, i may just be hearing air on exhaust and intake due to it passing that way rather than having valve issues. The main reason I'm asking is because I'm trying to figure out if I should be pulling the motor or if there's a decent chance just pulling the head will get me what I need. Any input / opinions much appreciated.