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How to Perform a Compression Test
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TOPIC: How to Perform a Compression Test
#16354
How to Perform a Compression Test 6 Years, 8 Months ago Karma: 52
A compression test is a good indicator if your pistons/rings are damaged of if your HG is lifting/Blown. There are other symptoms of the above but if you have too low of compression in a cylinder there's something wrong with or without the other symptoms.

Ill ad pictures when i take them,for now I'll just have to use text.

1) Get the engine to normal running temperature.

2) Remove the Spark plugs leads.

3) Remove the king (not the distributor end)

4) Remove Spark Plug 1 (doesn't matter which order)

5) Screw the Compression Tester into the spark plug hole.

6)While you are looking at the compression tester get someone to start turning the engine over via the key while holding there foot firmly on the accelerator all the way down.

7) Let the compression build until it stops and then stop the person from turning the engine over.

8) Write down the Compression results/Remove Compression Tester/Replace Plug

9)Repeat step 4 - 8

10) Compare results,they should all be within %10 of each other across the board.If not you have a problem and this could be the problem for the loss of power etc

Personally i do the test twice to be 100% sure.

Also to eliminate ringland failure,drop a bit of oil into the cylinder where the compression is low and redo the test,if compression goes back up its pointiong towards ringland failure.


Ill be editing this with what a 3S-GTE (TURBO) and 3S-GE (NA) good compression figures.

Link to Compression Tester I use - Compression Tester

Dan

*If anyone thinks there is more to add or I made a mistake just reply here
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Last Edit: 2010/08/11 22:52 By dan_ep82.

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#16355
Re: How to Perform a Compression Test 6 Years, 8 Months ago  
I just read this part in the MR 2 Performance book
SleepMethod

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#16356
Re: How to Perform a Compression Test 6 Years, 8 Months ago Karma: 52
SleepMethod wrote:
I just read this part in the MR 2 Performance book

lol,never heard of that book,this is just something i do every now and then to make sure alls ok
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#16357
Re: How to Perform a Compression Test 6 Years, 8 Months ago  
It's a pretty cool book, got it from a recommendation from this site. I'm pretty much a newbie when it comes to moding and maintaining a car so I've a lot to learn
SleepMethod

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#16358
Re: How to Perform a Compression Test 6 Years, 8 Months ago Karma: 52
SleepMethod wrote:
It's a pretty cool book, got it from a recommendation from this site. I'm pretty much a newbie when it comes to moding and maintaining a car so I've a lot to learn

not the only one,ive still to get an MR2 lmao
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#16370
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 148
Excellent write up Dan, nice one. Was always curious as to how this is done. I actually think my head gasket is blowing. Gonna get it checked before it does damage. Maybe tomorrow actually, its pissing me off.

The link to the compression tester brings you to Halfords but no result. Ah, no matter.

KC+1 for you for the write up. Cheers!
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#16371
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 52
SWAGGER wrote:
Excellent write up Dan, nice one. Was always curious as to how this is done. I actually think my head gasket is blowing. Gonna get it checked before it does damage. Maybe tomorrow actually, its pissing me off.

The link to the compression tester brings you to Halfords but no result. Ah, no matter.

KC+1 for you for the write up. Cheers!


Check your oil cap for white smudgy stuff.Sometimes your water reservoir can have gunk in it too.Check to make sure you have heat.Check to see if it is drinking water. You could always whip of the head aswell for a look see,shouldn't take long but you'd need new head bolts (unless the MR2 doesn't use stretch bolts?) and the torque specs and order.If it is gone id do the timing belt etc aswell,or at the very least check it for cracks and corrosion.

Link is fixed,that's the second time my links didn't work on here,wonder if its the forum software?

Cheers
I'll do a few more once i get the 2 to see if i can fill the tutorials up a wee bit
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#16384
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 148
Oil cap is clean. Wouldn't mind taking the head off at some point anyway. Want to replace with a custom one. I am not 100% but I think they do use stretch bolts so would have to have a new of ARP ARP bolts and a steel HG on standby, maybe HKS or similar. I have a brand new timing belt ready to go already. Kinda want to have the internals inspected anyway to see whether or not they are forged. Then I would be more comfortable with higher boost etc.
Thanks for your input mate!
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#16395
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 52
SWAGGER wrote:
Oil cap is clean. Wouldn't mind taking the head off at some point anyway. Want to replace with a custom one. I am not 100% but I think they do use stretch bolts so would have to have a new of ARP ARP bolts and a steel HG on standby, maybe HKS or similar. I have a brand new timing belt ready to go already. Kinda want to have the internals inspected anyway to see whether or not they are forged. Then I would be more comfortable with higher boost etc.
Thanks for your input mate!


Before choosing what HG you want (especially if your going forged) work out what compression your pistons (size and dish) and HG width will give you and then have a look at a couple of compressor maps of different turbo's you want to run and see which suits your compression best.Or the other way around,picking a turbo and using the right combo of HG and Pistons to get the compression you want to make peak power from your turbo/engine.Now im not great at working any of that out but a decent tuner will do it for you,especially if they are mapping the car.
Not so sure on MR2's but on the 4efte the standard head bolts are good for 1.4-1.5 bar of boost and the ARP up to 2.0bar,you mightn't need them.

If you want to see yourself if you have forged internals whip off the sump.Putting it back on will involve sealing it with sump sealer,handy. Then just look for manufacturer marks on the con-rods and the bottom of the pistons (obviously the top will be hidden from view)
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#16417
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 148
Cheers Dan. Was just on the phone to Couture, they are pretty sure it sounds like an exhaust gasket by the symptoms. They will replace the whole set of exhaust gaskets as a kit, exhaust, manifold, turbo and downpipe. There are a few other jobs they are going to do for me at the same time. It's booked in for Thursday 19th, soonest I could get.
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#16424
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 52
SWAGGER wrote:
Cheers Dan. Was just on the phone to Couture, they are pretty sure it sounds like an exhaust gasket by the symptoms. They will replace the whole set of exhaust gaskets as a kit, exhaust, manifold, turbo and downpipe. There are a few other jobs they are going to do for me at the same time. It's booked in for Thursday 19th, soonest I could get.

Not so bad so
Couture ARE dear though,even compared to other tuning companies but they are good at what they do,im probably just tight
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#16425
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 148
Who else are good with Toyota that you know?

Icetronix are a Honda house, TDP is miles away. Couture are like 25 mins from me, handy enough.
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#16454
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 52
Martin Tracey,Triple 7 and East Coast Customs

Dont like robbie (TDP),very bad attitude problem
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#16467
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 148
Agreed, I thought he was an ignorant ****** had no time to talk, was way too important for his own good. I tried to ask him a question and was disgusted with his attitude. Would never spend a penny there again.
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#16472
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 52
SWAGGER wrote:
Agreed, I thought he was an ignorant ****** had no time to talk, was way too important for his own good. I tried to ask him a question and was disgusted with his attitude. Would never spend a penny there again.

A point of view I hold to aswell,alas after his claim of if he entered time attack he would win...well his standings say it all in my opinion.Ive no doubt he's very good at what he does but personally thats not enough
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#16562
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 312
I've not had that experience with Robbie. Maybe you guys got him on a bad day..

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#16567
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 148
That was on our Dyno day....ill talk to you in person when you see you again.
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#16658
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 326
Good write u Dan well worthy of a KC and +1 on Westward (Martin Treacy). I will sticky this thread when you get the picture into it.
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#16659
Re:How to Perform a Compression Test 6 Years, 8 Months ago Karma: 52
slipsliderg wrote:
Good write u Dan well worthy of a KC and +1 on Westward (Martin Treacy). I will sticky this thread when you get the picture into it.

Thanks
I done a compression test on it since but didnt have the camera with me,ill have the pictures up by the middle of the week.

Oh,and my compression test came up 180-183 across the board
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