EG Hatch with B18C1 Swap - Burning Oil Question
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EG Hatch with B18C1 Swap - Burning Oil Question
I have a 1995 Honda Civic CX hatch. It has a 1999 B18C1 swap in it.
It's been burning oil for some time now. Originally, I guessed that it was valve seals, so I took the head off, broke it down, had it cleaned, cleaned all of the valves, made sure no valves were bent, re-lapped the valves, replaced the valve seals, and adjusted the valves. The motor runs super smooth and doesn't have any ticking noises or anything, but it still burns oil.
I notice the blue smoke coming out of the exhaust mostly on deceleration, when I'm downshifting. I also notice it sometimes when I'm being easy on the car at very little throttle. Very rarely do I notice it when I'm hammering on it.
I did a compression test, right after driving the car, so it was at operating temperature. I had a solid 220 PSI across the board.
I also did a leak down test. Cylinder 1 was 27.5%. Cylinder 2 was 9%, which I'm not too worried about. Cylinder 3 was also 27.5%. Cylinder 4 was 5%, which I'm also not too worried about.
In cylinders 1 and 3, the air was leaking out of the throttle body, indicating that the intake valves on those cylinders are not sealing properly.
From what I was told, the B18C1 swap has almost 180k miles on it.
From what it looks like to me, signs seem to be pointing towards the valve guides. Am I making a good assumption? Any input is appreciated.
Thanks in advance!
- DJ
It's been burning oil for some time now. Originally, I guessed that it was valve seals, so I took the head off, broke it down, had it cleaned, cleaned all of the valves, made sure no valves were bent, re-lapped the valves, replaced the valve seals, and adjusted the valves. The motor runs super smooth and doesn't have any ticking noises or anything, but it still burns oil.
I notice the blue smoke coming out of the exhaust mostly on deceleration, when I'm downshifting. I also notice it sometimes when I'm being easy on the car at very little throttle. Very rarely do I notice it when I'm hammering on it.
I did a compression test, right after driving the car, so it was at operating temperature. I had a solid 220 PSI across the board.
I also did a leak down test. Cylinder 1 was 27.5%. Cylinder 2 was 9%, which I'm not too worried about. Cylinder 3 was also 27.5%. Cylinder 4 was 5%, which I'm also not too worried about.
In cylinders 1 and 3, the air was leaking out of the throttle body, indicating that the intake valves on those cylinders are not sealing properly.
From what I was told, the B18C1 swap has almost 180k miles on it.
From what it looks like to me, signs seem to be pointing towards the valve guides. Am I making a good assumption? Any input is appreciated.
Thanks in advance!
- DJ
#5
Honda-Tech Member
Re: EG Hatch with B18C1 Swap - Burning Oil Question
The bottom end needs a refresh. High vacuum on decel will pull it right past the rings. This is extremely common on these motors after they get a few years on them. The leak down numbers don't sound right as 27% is huge. Did you have the crank at tdc for sure on each cyl?
#6
Ferio Wdm Edition
Re: EG Hatch with B18C1 Swap - Burning Oil Question
Bad piston rings can do that. I say check valve seals as that is an easy fix compared installing new rings.
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And how would I have screwed up on the leak down test?
The bottom end needs a refresh. High vacuum on decel will pull it right past the rings. This is extremely common on these motors after they get a few years on them. The leak down numbers don't sound right as 27% is huge. Did you have the crank at tdc for sure on each cyl?
Like I said above, I have the extra GSR head that I just did all of that work on, so I'm going to try that and see what happens.
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egjack
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12-02-2010 06:43 AM