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Those are good compression test results…. nice and even…
Hard to tell from the photo or angle if the electrodes are worn on those plugs though… Looks kinda like it…
-Karl
[quote=”ToyotaKarl” post=109373]Those are good compression test results…. nice and even…
Hard to tell from the photo or angle if the electrodes are worn on those plugs though… Looks kinda like it…
-Karl[/quote]
I took a couple shots I hope these angles are better. Also thank you for the reply!
Yeah, good compression numbers but I think I would replace those plugs. They are showing some wear but are burning well.
Will do!
Thank you for your help!I do have a question about the compression. At what point do you say the motor is done? Let’s say it was 120 – 130 dry and 130 – 135 wet. All close no head gasket issues or rings broken just low compression. Is there a point you say rebuild or replace?
It used to be that the lowest cylinder compression should be 75% of the highest just as a guide. I read that somewhere many years ago.
Once you start getting under 120 psi when normal compression is 180 psi there has to be a reason for it. Poor performance and general poor running usually results. Most likely worn compression rings and cylinder walls is the cause.
I remember my DaD’s old 1952 Ford flathead having such poor compression it wouldn’t start when it was hot. It has 65 to 75 psi compression. When it cooled the oil on the rings thickend up and sealed them and it started again. A healthy flathead only hat 125psi compression when it was new.
Just a little trivia.
For me, a compression test is not very useful. I rarely do one. The reason is the engine has so many other ways of telling me something is wrong. When that ‘something wrong’ happens I might then get out the gauge depending on the symptoms.
Those numbers look good. I would replace the plugs though. They look old. Use the same brand and type. Also consider replacing the cap and rotor. Leave the wires along if they’re Honda. The Honda wires last forever. You run into problems when you replace them with aftermarket stuff. That is unless they’re NGK wires. Those work pretty good too.
Honestly, if you change the oil on a regular basis and keep an eye on the temp, you shouldn’t need to worry about loosing compression for a good long time. Honda makes a good engine, and the one you have is one of the better ones. As long as you maintain it, you shouldn’t have much to worry about.
[quote=”EricTheCarGuy” post=109574]Those numbers look good. I would replace the plugs though. They look old. Use the same brand and type. Also consider replacing the cap and rotor. Leave the wires along if they’re Honda. The Honda wires last forever. You run into problems when you replace them with aftermarket stuff. That is unless they’re NGK wires. Those work pretty good too.
Honestly, if you change the oil on a regular basis and keep an eye on the temp, you shouldn’t need to worry about loosing compression for a good long time. Honda makes a good engine, and the one you have is one of the better ones. As long as you maintain it, you shouldn’t have much to worry about.[/quote]
Eric:
Thank you for the reply and I have replaced the spark plugs. The Internet is a great tool. However, if you’re not sure what you’re looking for I can get rather confusing extremely quick. So, I was a little concerned when I would see video or forum post that would show compression numbers in the low 200s to mid 250. Needless to say I was getting a little concerned. However, if I’m understanding this correctly. It’s all relative what you’re looking for is consistency across the board. On a sidenote looking through your forum I think I might have found how to keep that smooth consistent idol when the AC kicks on. I think the dealership tighten the AC belt too much so, I loosened it up and it seems to have smooth that out. Or it could be I have a slight vacuum leak and I’m going to try what you recommended in the video.
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