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Compression Test Results, What Could It Be? 2000 Prelude can I still run Nitrous?

 
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Old 11-10-2007, 06:43 PM
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Compression Test Results, What Could It Be? 2000 Prelude can I still run Nitrous?

Just Did my compression test today, here are my numbers
#1 150-155
#2 170-175
#3 180-185
#4 190-195

I did not do a wet test to check the first and second cylinder, I will probably do that tommorow.
What does this mean? Is it a bad headgasket? Is it worn rings? Valves?
any help would be great.
I'm trying to throw a 75 shot instead of my 55 shot and I don't want to screw something up. My setup is good, but I did replace the headgasket a few years back with what I think was a crappy one. I'm wondering if thats it. I'm thinking about taking it to honda for a leakdown test. Also the spark plugs were showing the car is running pretty rich. I like that because its safer when I'm running the nitrous.

--------------------------------------------------------------------------------

My setup
2000 prelude base
I/H/E/
dyno Tuned VAFC (Running Rich while on Nitrous for Safety) around 11 a/f
ACT clutch and lightened flywheel
MSD SCI Ignition w/ blaster 2 and ngk blue wires
new Zex Spark Plugs
Zex Wet kit currently running 55 shot about 6 bottles in a couple years no problem
Dynotune bottle heater
did compression check before putting the 55 shot in, and will be doing another one before using the 75 shot
I will also be changing the fuel filter and adding a fuel gauge to make sure the pressure is up to par. Don't believe I need an fpr, but I could be wrong.

What I'm doing
want to increase to the 75 shot with the zex kit
got msd 8982 start/retard controller to retard timing 3 deg while on the juice
got msd 8969 digital rpm window switch to keep traction and cut of juice before the rev limiter

Wondering what the opinions are about how safe this will be and any other suggestions I should use to increase my odds of success. This is a daily driver and my baby, I just want more power safely.
If I had the extra money I would upgrade the fuel system, but from what I hear that is not necessary with the ludes until 100 shot.
Will probobly get a fuel safety switch and new high flow fuel pump as well as

any opinions would be great
Thanks in Advance
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Old 11-10-2007, 11:26 PM
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Do a wet test and see if cylinder 1 is higher than the dry test.
Remember, do it a few times and average out the results.

with all the stuff you've listed, you seem to be good to go with the 75 shot...i like the fact that you are using colder plugs in the ZEX plugs as well.
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Old 11-11-2007, 12:03 AM
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thanks for the vote of confidence, I will do the wet test tommorow. I'll let you know how it goes.
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Old 11-11-2007, 12:09 AM
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i wouldn't do anything until you figure out whats wrong w/ #1 and 2. could be anything, piston rings, valves....
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Old 11-11-2007, 12:02 PM
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I won't, I will be doing a wet test today, I'll post those numbers, and I'll be taking it to honda for a leakdown test this week. thankyou
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Old 11-11-2007, 03:58 PM
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Just completed the wet comp test results exactly as you said to do, here they are

Dry Wet

#1 150 175
#2 170 200
#3 185 210
#4 185 210

They all seem to be varying by around 25.
Also there is oil on the valve cover where the spark plugs install around the holes, also around the seal of the valve cover, and the distributer. The new spark plugs I installed yesterday are already black so I know the car is running really rich, I have no idea if that means anything. I have read running too rich can wach away some of the oil around the rings. On the dyno, it ran around 13's off the juice and as low as 11's on the juice. I know I'm not an expert by any means, but I really wonder about that head gasket. I replaced it when I had the 3 angle valve job done and don't remember what brand name it was. Also my buddy put it on, he did all the work for me back then because I didn't know crap. It is easily possible that he messed up the torque sequence, don't even know if he torqued them at all. He never used a manual I know that. That was a few years ago, I guess I'm lucky. I know I sound like an idiot now, but I just had no idea what I was messing with back then. I am just now catching up and learning to do my own maintenance and research. I am an electrition by trade, I worked on helicopters for the army, so I'm not an idiot, and I can learn. If I do need to replace the head gasket, how difficult is it? I will take the car to honda this week for the leakdown test. There is someone that had the exact same setup as me with more mods for the fuel system, and the exact same compression results who blew his engine on the 3rd pass w/ a 75 shot. The only difference was it was a dry kit. That got me worried as hell. He did not hit the rev limiter or anything like that. Also, how do I tighten my belts, where is the tensioner bolt? I've got the unorthodox pulley kit (I'm removing the crank pulley due to all the controversy), and Its squeeking at start up until it is warm.

Thanks again for taking the time out.
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Old 11-16-2007, 06:23 AM
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Well hook it up, You'll fix that #1 on the first Nitrous shot. I'd say re ring it first. Don't blow it.
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Old 11-16-2007, 12:59 PM
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The rule of thumb is that they all run within 14 points of each other....your cylinders seem to be wearing at an uneven rate, which is bad. My h23 has 175,000 miles on it and i did a compression check 2 weeks ago, my cylinders were all 216-219 . So you can see that your engine isn't wearing right. You've got a difference of 35 points between cylinder 1 and 4. I would advise against the nitrous and suggest a rebuild. Hone your cylinders, replace your piston rings, and check your head out while you're at it. You may even want to go with higher compression since it's all motor.
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Old 11-16-2007, 01:28 PM
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when u had ur head done if the person who did it did not use the correct torque sequence it could possible warp the head a little. you are supposed to take 3 passes to completely tighten all the bolts, increasing the torque each time till the correct number is reached. im not sure if that could be the reason for cylinder #1 to be off so much but just throwin that out there.
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Old 11-17-2007, 05:59 PM
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second the rings
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