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Compression test results 

 

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 Post subject: Compression test results
Posted: Mon Dec 08, 2014 10:31 pm 
Oompa Loompa
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Age: 40

Posts: 42

Joined: 29th Jan 2008

Gallery: 1 images

Ride: BAII Futura

Location: Wangaratta
VIC, Australia

Hi all,
I just did an AU conversion on my ED track car.
Transplant motor has about 180kkm from an AU2 converted to LPG (hit a roo).
Still running stock head and cam but with log manifold, ED fuel rail and gli fpr and AU injectors

I was running way to much advance on ignition, engine was pinging and overtemp light came on through 3x 4lap sessions at Winton.
I had one session with oil coming out of the dipstick hole.
Things got better when we got the timing under control

I did a compression test since and got:
1 to cyl 6: 160 160 120 130 140 140 dry.
Wet test give a consistent extra 10 psi on each piston
Spark plug where carbon black.

Someone told me that low comp on cyl 3 and 4 may show burnt exhaust valves.

My plan is to swap to a tickford head + wade cam 977b and get the J3 chip dyno tuned.

Is it worth doing on that bottom end or should I be chasing another one? (I can really justify the cost of a rebuilt engine)
Can anyone advise on the compression test results?
Cheers
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 Post subject: Re: Compression test results
Posted: Tue Dec 09, 2014 7:02 pm 
Getting Side Ways
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Age: 49

Posts: 6467

Joined: 18th Dec 2006

Ride: 93 ED sedan

Power: 161 rwkw

Location: Rockhampton
QLD, Australia

I did this post in Feb, 2013...............

I did a compression test the other day.....I was fitting some new spark plugs, and thought, why the hell not.....so I did a dry comp. test.
They were all 185 psi, except for #1, which was 190 psi.
The engine is approaching 150,000km..........

This is an ED 4.0 original bottom end with an EA 3.9 head on it.....using a composite head gasket, and an EF XR6 cam.

Me thinks your donk is rather worn.

 

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 Post subject: Re: Compression test results
Posted: Wed Dec 10, 2014 11:04 pm 
Oompa Loompa
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Age: 40

Posts: 42

Joined: 29th Jan 2008

Gallery: 1 images

Ride: BAII Futura

Location: Wangaratta
VIC, Australia

cjh wrote:
I did this post in Feb, 2013...............

I did a compression test the other day.....I was fitting some new spark plugs, and thought, why the hell not.....so I did a dry comp. test.
They were all 185 psi, except for #1, which was 190 psi.
The engine is approaching 150,000km..........

This is an ED 4.0 original bottom end with an EA 3.9 head on it.....using a composite head gasket, and an EF XR6 cam.

Me thinks your donk is rather worn.


You're probably right.
Now I got to figure out whether I rebuild or take a gamble on another Au engine...
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 Post subject: Re: Compression test results
Posted: Thu Dec 11, 2014 8:41 pm 
Getting Side Ways
Offline
User avatar

Age: 49

Posts: 6467

Joined: 18th Dec 2006

Ride: 93 ED sedan

Power: 161 rwkw

Location: Rockhampton
QLD, Australia

syl77 wrote:
cjh wrote:
I did this post in Feb, 2013...............

I did a compression test the other day.....I was fitting some new spark plugs, and thought, why the hell not.....so I did a dry comp. test.
They were all 185 psi, except for #1, which was 190 psi.
The engine is approaching 150,000km..........

This is an ED 4.0 original bottom end with an EA 3.9 head on it.....using a composite head gasket, and an EF XR6 cam.

Me thinks your donk is rather worn.


You're probably right.
Now I got to figure out whether I rebuild or take a gamble on another Au engine...


If you rebuild it, then you will know what you have....and whats been done.

 

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http://youtu.be/jJTh9F3Vgg0

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