ACCLUDE91
07-13-2005, 10:19 PM
This vid shows why I'm putting in a new motor sometime this week/weekend.
It was made about a month ago and the problem has gotten worse since then. The motor has just hit 300k and it's a little worn out at this point. The valve springs are getting weaker everyday that I drive it and I'm starting to get some bad valve float at high RPM's. In the vid the float becomes aparent right around 6k and now it's currently floating at about 5k. You gotta have the volume on to hear it. First is hard to tell, but it becomes real clear in second and worse in third. The higher the engine load the worse they float. A few months ago this was a 15 sec. car which isn't bad considering the mileage and the fact that my only power adders are an intake and a beefier coil. I could not get it lower than 16.2 at the track two weekends ago. It seems like a misfire but I've eliminated that possibility. Sorry the footage sucks...it's a pain to hold the camera, steer and shift at the same time. Anyways, here's the vid:
0-100 run w/misfiring vid:
http://www.eastcoasthonda.org/patrick/misfire/MOV04175.MPG
This vid was taken AFTER the 0-100 MPH run. It shows that the car can and will hit high RPM’s and rev up to rev-limit (6.8k) without any misfiring, valve float or any issues of any kind:
High RPM sweep vid:
http://www.eastcoasthonda.org/patrick/misfire/MOV04180.MPG
I've done some testing and here's some results:
Compression test results:
For the first pass I just pulled the plugs, pulled fuel pump fuse, lodged the throttle open and cranked each cyl for 8 compression strokes.
Factory specs. - minimum of 135psi and a standard of 178psi
cyl.1---cyl.2---cyl.3---cyl.4
151----162----171----182
Altough cyl.1 is a little low, it is still within OEM spec. All 4 cyls, built up pressure quickly on the first stroke and continued to rise evenly for each stroke after that.
For the second pass, I poured about 50-75ml of oil into each cyl before testing and then cranked them for 8 compression strokes each. The new results:
cyl.1---cyl.2---cyl.3---cyl.4
190----230----213----245
That basically tells me that the piston rings are shot on all 4 cyls. which I knew that. The motor started burning and consuming a little bit of oil about 100k miles ago so this one is no big suprise. It also looks like there may be some carbon deposits in cyls 2-4 resulting in the increased compression.
Valve Adjustment:
Well, I was a little concerned about Cyl.1 (possibly a worn cam lobe) so I went ahead and pulled the valve cover off and did a thorough visual inspection of the cam lobes on all cyls and particularly cyl.1. Everything looked good. While the cover was off, I went ahead and did a valve adjustment as well. Factory spec is .002-.003in Most read right around .003-.005. The worst one was at .013 and that was the first intake valve on cyl.4. This wouldn't cause the mis that's happening but I figured I might as well check everything and set it to spec just so that I KNOW it's set right. Also, I looked at valvetrain movement as the crank was turned for each cyl. and it appears to be working exactly as it should.
Cam/Crank Timing:
Well, cam/crank timing and the timing belt are perfect. It could have been possible that the timing belt jumping a tooth could cause the misfire that's happening at high RPM but I checked them and they're perfect. With the timing mark on the flywheel alligned, the cam is perfectly at 0 deg.
Ignition Timing:
I set the timing AGAIN. It is curerently at +15 @TDC and that's within factory spec.
Plus I've checked all the basics and everything is checking out perfect. It's very apparent that this motor isn't gonna last very much longer. It is getting changed any day now. Check back here in about a week for the "motor blowing ceremony" vid to see this motor gettin blown up :tu:
It was made about a month ago and the problem has gotten worse since then. The motor has just hit 300k and it's a little worn out at this point. The valve springs are getting weaker everyday that I drive it and I'm starting to get some bad valve float at high RPM's. In the vid the float becomes aparent right around 6k and now it's currently floating at about 5k. You gotta have the volume on to hear it. First is hard to tell, but it becomes real clear in second and worse in third. The higher the engine load the worse they float. A few months ago this was a 15 sec. car which isn't bad considering the mileage and the fact that my only power adders are an intake and a beefier coil. I could not get it lower than 16.2 at the track two weekends ago. It seems like a misfire but I've eliminated that possibility. Sorry the footage sucks...it's a pain to hold the camera, steer and shift at the same time. Anyways, here's the vid:
0-100 run w/misfiring vid:
http://www.eastcoasthonda.org/patrick/misfire/MOV04175.MPG
This vid was taken AFTER the 0-100 MPH run. It shows that the car can and will hit high RPM’s and rev up to rev-limit (6.8k) without any misfiring, valve float or any issues of any kind:
High RPM sweep vid:
http://www.eastcoasthonda.org/patrick/misfire/MOV04180.MPG
I've done some testing and here's some results:
Compression test results:
For the first pass I just pulled the plugs, pulled fuel pump fuse, lodged the throttle open and cranked each cyl for 8 compression strokes.
Factory specs. - minimum of 135psi and a standard of 178psi
cyl.1---cyl.2---cyl.3---cyl.4
151----162----171----182
Altough cyl.1 is a little low, it is still within OEM spec. All 4 cyls, built up pressure quickly on the first stroke and continued to rise evenly for each stroke after that.
For the second pass, I poured about 50-75ml of oil into each cyl before testing and then cranked them for 8 compression strokes each. The new results:
cyl.1---cyl.2---cyl.3---cyl.4
190----230----213----245
That basically tells me that the piston rings are shot on all 4 cyls. which I knew that. The motor started burning and consuming a little bit of oil about 100k miles ago so this one is no big suprise. It also looks like there may be some carbon deposits in cyls 2-4 resulting in the increased compression.
Valve Adjustment:
Well, I was a little concerned about Cyl.1 (possibly a worn cam lobe) so I went ahead and pulled the valve cover off and did a thorough visual inspection of the cam lobes on all cyls and particularly cyl.1. Everything looked good. While the cover was off, I went ahead and did a valve adjustment as well. Factory spec is .002-.003in Most read right around .003-.005. The worst one was at .013 and that was the first intake valve on cyl.4. This wouldn't cause the mis that's happening but I figured I might as well check everything and set it to spec just so that I KNOW it's set right. Also, I looked at valvetrain movement as the crank was turned for each cyl. and it appears to be working exactly as it should.
Cam/Crank Timing:
Well, cam/crank timing and the timing belt are perfect. It could have been possible that the timing belt jumping a tooth could cause the misfire that's happening at high RPM but I checked them and they're perfect. With the timing mark on the flywheel alligned, the cam is perfectly at 0 deg.
Ignition Timing:
I set the timing AGAIN. It is curerently at +15 @TDC and that's within factory spec.
Plus I've checked all the basics and everything is checking out perfect. It's very apparent that this motor isn't gonna last very much longer. It is getting changed any day now. Check back here in about a week for the "motor blowing ceremony" vid to see this motor gettin blown up :tu: