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Rob's Compression Test Results

 
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Old 09-23-2008, 05:47 PM
Rob Rob is offline
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Rob's Compression Test Results

Well the results are in I have a 1997 Prelude (Base) with about 150K miles on it. I decided to do a compression test on the motor because I am about to replace its second timing belt and replace the clutch and flywheel. I wanted to get this done so while its down I can make the decision to re ring it or not.

Starting left to right from sitting inside the car (driver's side to passenger)

188 psi 187 psi 189 psi 179 psi


Is that a true low cylinder or is that normal? -------^

My tester has a pressure release valve, so I let each one sit about 20 minutes each, is that considered a leak down test? None did by the way.

Thanks


I also had it dynoed down at Blue Ridge Motor Sports, they only did a HP reading told me they couldn't do torque because I still had the inner fender well in.

Anyhow I think I remember them saying the corrected was 157HP to the wheels. I didn't have the 18" wheels on at the time I had the stock blades on.

I think I could use a valve adjustment also.

Anyhow wanted the vets to let me know is this decent or do I have an underlying problem that needs attention thanks.

Last edited by Rob; 09-23-2008 at 05:51 PM.
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Old 09-23-2008, 07:38 PM
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Re: Rob's Compression Test Results

that is actually not bad. anything lower the like 140psi then you should worry. what i would recommend is w/ your oil changes use something called engine restore. its in a tin looking can and its a funky blue liquid you put it in w/ your oil when you do your oil change. what this does is fills in the wear on your cylinder walls. which in the long run would help keep your engine running as strong as it can. dont expect anything major at first but after a few uses it will definitely start kicking in. hope this helps
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Old 09-23-2008, 08:19 PM
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Re: Rob's Compression Test Results

not bad at all. the difference in pressure of the cylinders is more important than how low/high the readings are, cuz every engine will have different readings, especially @ diff altitudes.

a leakdown test is more like filling the cyl's with air pressure, than listening to whether its leaking out the valves or rings. altho idk how you would listen to it leaking out the piston rings


but did you do a wet AND dry comp test?
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Old 09-26-2008, 07:27 AM
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Re: Rob's Compression Test Results

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Originally Posted by twokexlv6coupe View Post
not bad at all. the difference in pressure of the cylinders is more important than how low/high the readings are, cuz every engine will have different readings, especially @ diff altitudes.

a leakdown test is more like filling the cyl's with air pressure, than listening to whether its leaking out the valves or rings. altho idk how you would listen to it leaking out the piston rings


but did you do a wet AND dry comp test?

No I guess your asking if I did a warm and cold. I only checked in cold. I guess while the engine is warm I would see lower numbers? I'll have to give that a try. When I get back from the beach, I'm ordering all my parts to do my timing belt change I may replace all the seals on the front of the motor, then while its down I'll go ahead and put on the fidanza flywheel and clutch I got a couple months ago and replace the rear main. I think the motor is still pretty strong and I may just get the turbonetics kit and install that on the stock motor and run at low boost like 6 to 8 psi. Seems they run rather well with a good tune. I may even put some larger cams in we'll see. But thanks on the info of the compression test.
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Old 09-26-2008, 09:18 AM
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Re: Rob's Compression Test Results

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Originally Posted by Rob View Post
No I guess your asking if I did a warm and cold. I only checked in cold. I guess while the engine is warm I would see lower numbers? I'll have to give that a try. When I get back from the beach, I'm ordering all my parts to do my timing belt change I may replace all the seals on the front of the motor, then while its down I'll go ahead and put on the fidanza flywheel and clutch I got a couple months ago and replace the rear main. I think the motor is still pretty strong and I may just get the turbonetics kit and install that on the stock motor and run at low boost like 6 to 8 psi. Seems they run rather well with a good tune. I may even put some larger cams in we'll see. But thanks on the info of the compression test.

nope, when i say wet and dry, i mean wet and dry.
you ALWAYS wanna do it on a cold engine, cuz if you do it on a warm engine, all the materials (i.e. piston rings) have already expanded and will give you a HIGHER reading than vs cold.

but wet and dry is this: first you do the dry, which you already did. afterwards, you pour a capful of oil down into each cylinder, then do another comp test. if the numbers go up, then you know there's slight leakage from the rings.
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Ivey Tuned - Advan - Cobb - Rallispec - CP - Perrin - ACT - KillerB - Carillo - TurboXS - Defi - Innovate - Walbro - DeatschWerks - Feal - H&R - Alpine - Infiniti - Curt

2001 Kawasaki STX1100 D.I. - Sold!
2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump


Quote:
Originally Posted by Brash View Post
But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 09-26-2008, 10:49 AM
Rob Rob is offline
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Re: Rob's Compression Test Results

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Originally Posted by twokexlv6coupe View Post
nope, when i say wet and dry, i mean wet and dry.
you ALWAYS wanna do it on a cold engine, cuz if you do it on a warm engine, all the materials (i.e. piston rings) have already expanded and will give you a HIGHER reading than vs cold.

but wet and dry is this: first you do the dry, which you already did. afterwards, you pour a capful of oil down into each cylinder, then do another comp test. if the numbers go up, then you know there's slight leakage from the rings.
ah sweet, yeah I never thought about that, thanks. I'll do that next week.

p.s. although the numbers I had, how do they relate to the new stock compressions? Just wondering I guess I can search and find those.
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Old 09-26-2008, 12:05 PM
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Re: Rob's Compression Test Results

it'll vary with altitude.
which is why its not as important to have higher numbers, but rather for them to be closer to each other.

and as per Xenocron's website:

Approximately ‘Healthy’ numbers –

· 8:1-8.5:1 compression: 150-170 psi per cylinder

· 8.5:1~9.5:1 compression: 170-210 psi per cylinder

· 9.5:1~11:1 compression: 210-275 psi per cylinder

· 11:1+ compression: 250+ per cylinder (highly depends on cams being used)

The tested numbers shouldn’t vary any more than 10% from cylinder to cylinder.
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2005 Stage2.5+ Subaru WRB STi : RzKar!
Ivey Tuned - Advan - Cobb - Rallispec - CP - Perrin - ACT - KillerB - Carillo - TurboXS - Defi - Innovate - Walbro - DeatschWerks - Feal - H&R - Alpine - Infiniti - Curt

2001 Kawasaki STX1100 D.I. - Sold!
2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump


Quote:
Originally Posted by Brash View Post
But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 09-26-2008, 02:47 PM
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Re: Rob's Compression Test Results

yes the compression is great for ur mileage... u want each cylinder to be within 10% of each other... i did one at school my compression was a lil lower like in the 160's n 170's but still within the 10% i also did leakdown test and have around 20% leakdown on cylinders 1,2, and 4. u might want to consider doin a leakdown as well to help u make sure u have absolutely no headgasket or oil leaks. the wet compression is one of the best test to check ur rings. i noticed im burning oil so if ur not burning any oil u should be fine with rings. r u blowing any smoke? or are u noticing oil loss while changin oil...and if u r... if u not leaving small spots of oil where u park check ur PCV jus pop it out and see if it clicks if not its broke and ur oil is turning into a mist in ur crankcase... i found out the hard way bought rings didnt install yet but found out to be my PCV so now ill have to get one of those!
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Old 09-26-2008, 05:00 PM
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Re: Rob's Compression Test Results

Quote:
Originally Posted by Kozmo98Prelude View Post
yes the compression is great for ur mileage... u want each cylinder to be within 10% of each other... i did one at school my compression was a lil lower like in the 160's n 170's but still within the 10% i also did leakdown test and have around 20% leakdown on cylinders 1,2, and 4. u might want to consider doin a leakdown as well to help u make sure u have absolutely no headgasket or oil leaks. the wet compression is one of the best test to check ur rings. i noticed im burning oil so if ur not burning any oil u should be fine with rings. r u blowing any smoke? or are u noticing oil loss while changin oil...and if u r... if u not leaving small spots of oil where u park check ur PCV jus pop it out and see if it clicks if not its broke and ur oil is turning into a mist in ur crankcase... i found out the hard way bought rings didnt install yet but found out to be my PCV so now ill have to get one of those!
No its not smoking but it does a bit in Vtec as most do as I hear (not uncommon) I don't usually have to add any oil between oil changes (I think once I added maybe 1/2 a quart) but keep in mind I don't drive this thing that much just to and from work. I think I have had this car a year now and havn't even driven it 6000 miles yet and I am about to do its fourth oil change already, plus its about to be parked to do a timing belt job should be its second according to its records and also replace the clutch and flywheel.

About the PCV valve I recently bought a new one and installed it about a month ago.

I have been reading up on going FI (reason for checking out the ol engine seeing if its strong enough to hold up). I think I have decided to get the Turbonetics kit and run it at 8 psi. I don't want crazy power still want it reliable, and I hear this is okay as long as your tuning is done properly.
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