NA Compression Test

[cushti]

A little white smoke from my NA aero when warm idling & a hint of the engine slightly missing at idle so decided to do a compression test. This is only because I'm putting it up for sale & don't want to pass on any issues to a buyer as I've just spent 9 mths tidying it up. So I have no water in oil, no oil in water, no overheating & the car runs very well so didn't expect any drama. Did a dry test, was from cold but all plugs out, WOT, efi fuses all out & cranked 7 secs every time, tested each cylinder twice as well.

 

WTF - do I have a head shaped like a banana?

 

1: 220

2: 76

3: 60

4: 89

5: 95

6: 212

 

Previous service history also tells me a new full headset & bolts & timing kit was only fitted 13k ago. There is only a receipt for the parts so perhaps this was done without any head-work. I'm just really surprised the engine runs so well without any overheating or mixing, also passed Mot emissions last month. My compression tester is also brand new so can't be faulty can it? Is this just a spectacular head gasket failure?

 

Any suggestions appreciated such as replace it as NA engines are cheap or is it worth taking the head off to check with these poor results e.t.c? Anyone got a good non-vvti engine they've just pulled?

Edited October 28, 2015 by cushti (see edit history)

[SupraP-Z]

Will be interesting to know what the next step is, im thinking of doing the same on mine - feels a bit low on power output. What kind of work is needed to get it back up and running like a new engine?

[Nic]

I doubt the car would run if those figures are correct. I'd start by redoing the test with a different compression tester.

 

If it helps, it explains how to do the compression test in the service manual here http://www.mkivsupra.net/vbb/content.php?65-Engine-Mechanical-(2JZ-GE)