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Author Topic:   Compression test results,66 289
mustangboy
Gearhead

Posts: 520
From: Ont, Canada
Registered: Mar 2002

posted 01-05-2003 05:24 PM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
I'd like some opinions on the readings from this motor.Its a bone stock 66 289 2-V with 62,000 miles on it.Its been sitting for about 2 years and has not ran since.I bought it a few months ago with the intention of putting it in my sisters 66 coupe.

front
130-----130
135-----145
120-----155
130-----160
I am a little concerned about the cylinder with only 120.I squirted in some oil and it jumped to 160 but then my compression gauge blew a hole in the rubber line so I couldn't retest it.Could the rings be a little sticky with it sitting so long?Should I be concerned? Its not going to be a race engine,but I want it to be a nice weekend cruiser that will last for quite a while.I was hoping not to have to get into it as I paid quite a bit for it because it was low mileage ($600).It shouldn't make any difference but the 5-8 cyls side had no exhaust manifold on it.

[This message has been edited by mustangboy (edited 01-05-2003).]

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SteveLaRiviere
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Posts: 31026
From: Saco, Maine
Registered: May 99

posted 01-05-2003 06:17 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
If it's been sitting without having been pickled there could also be a little rust in the cylinders or valve seats/faces. 120-160 is a 25% difference, which is pretty high.

If it's just going to be a cruiser, toss it in and run it for a while.

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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69 Sportsroof
Gearhead

Posts: 982
From: Valley, Alabama, USA
Registered: Mar 2002

posted 01-05-2003 06:22 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
The rings may be cracked. The rings were sticky due to it sitting for 2 years. Some type of penetrating oil in the cylinders before you spun it over would have helped. I used tranmission fluid in my motor through the spark plug holes and let it sit over night then turned the engine with a wrench before spinning it with the starter. If it's out of the car, I'd take it down and replace the rings. All you should need to do it hone the cylinder walls. Or you could install it and pour a can of Restore in it and see what happens.

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Moneymaker
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Posts: 18704
From: Lyons, IL, USA
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posted 01-05-2003 08:58 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Sorry but, I beg to differ in the cracked rings possibility. With even one cracked ring, in one cylinder you would not see over 50 lbs of compression in that hole.
It sounds about right for an engine that has been sitting around. If anything it may have one loose guide in that particular cylinder. I would not hesitate to use it.

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Alex Denysenko
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69 Sportsroof
Gearhead

Posts: 982
From: Valley, Alabama, USA
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posted 01-06-2003 10:33 AM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
There is something definately wrong with the rings in that one cylinder if squirting oil in it brought the compression up. Like Steve said, 25% is a big difference. If the engine hasn't been istalled yet, I'd spend the $100 and re-ring it. If it has, pour in some Restore and drive it.

[This message has been edited by 69 Sportsroof (edited 01-06-2003).]

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Dubz
Gearhead

Posts: 243
From: Manitoba Canada
Registered: Oct 2002

posted 01-06-2003 12:56 PM     Click Here to See the Profile for Dubz   Click Here to Email Dubz     Edit/Delete Message   Reply w/Quote
according to a compression test percentage chart that i have for a 160 max 120 is the min so it's all good, but JUST!!

------------------
1974 Gran Torino, 351W
1970 Mustang Grande, 289

Just a young buck

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Moneymaker
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Posts: 18704
From: Lyons, IL, USA
Registered: May 99

posted 01-06-2003 01:32 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by 69 Sportsroof:
[B]There is something definately wrong with the rings in that one cylinder if squirting oil in it brought the compression up.B]

Nope!

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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69 Sportsroof
Gearhead

Posts: 982
From: Valley, Alabama, USA
Registered: Mar 2002

posted 01-06-2003 02:27 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
Nope!



OK. Maybe I need a lesson or something. What are the possible causes of the low pressure for that one cylinder? All of the cylinders could have shown an increase if he squirted oil in each of them. But for one cylinder to be that much lower than the rest of them to me indicates there's something wrong there. I could see it if maybe the rings hadn't had a chance to seat but this engine has 60k + on it and it's been sitting for 2 years. I guess I just believe too much in the old "ounce of prevention" saying.

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SteveLaRiviere
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Posts: 31026
From: Saco, Maine
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posted 01-06-2003 02:37 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by 69 Sportsroof:
OK. Maybe I need a lesson or something. What are the possible causes of the low pressure for that one cylinder?

quote:
Originally posted by SteveLaRiviere:
If it's been sitting without having been pickled there could also be a little rust in the cylinders or valve seats/faces.


------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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Moneymaker
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posted 01-06-2003 02:40 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
A cracked ring will about kill a cylinder as I stated ealier. It's usually under 50 lbs and then it will only go from zero to 50 or from 50 to maybe 100. Oil won't seal it well enough to get is back to 160+.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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SteveLaRiviere
Administrator

Posts: 31026
From: Saco, Maine
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posted 01-06-2003 02:43 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Plus it will be a smoker like you wouldn't believe.

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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69 Sportsroof
Gearhead

Posts: 982
From: Valley, Alabama, USA
Registered: Mar 2002

posted 01-06-2003 02:57 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by SteveLaRiviere:
[QUOTE]Originally posted by SteveLaRiviere:
[b]If it's been sitting without having been pickled there could also be a little rust in the cylinders or valve seats/faces.


[/B][/QUOTE]

Right. That's why I oiled mine up before turning it over and only turned it 90 degrees per day and relubed it each time.

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SteveLaRiviere
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From: Saco, Maine
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posted 01-06-2003 02:59 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
That's how you do it. Even better, after you have all the cylinders oiled, you back off the rocker arm nuts and close all valves.

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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69 Sportsroof
Gearhead

Posts: 982
From: Valley, Alabama, USA
Registered: Mar 2002

posted 01-06-2003 03:00 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
A cracked ring will about kill a cylinder as I stated ealier. It's usually under 50 lbs and then it will only go from zero to 50 or from 50 to maybe 100. Oil won't seal it well enough to get is back to 160+.


I was thinking it would get more pressure than that with only 1 of the rings being cracked. Don't know so that's why I'm asking.

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69 Sportsroof
Gearhead

Posts: 982
From: Valley, Alabama, USA
Registered: Mar 2002

posted 01-06-2003 03:01 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by SteveLaRiviere:
Plus it will be a smoker like you wouldn't believe.


I agree but he doesn't have it running yet...

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69 Sportsroof
Gearhead

Posts: 982
From: Valley, Alabama, USA
Registered: Mar 2002

posted 01-06-2003 03:04 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by SteveLaRiviere:
after you have all the cylinders oiled, you back off the rocker arm nuts and close all valves.


That's what I would have done before putting it away long term.

This is great info.

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Moneymaker
Administrator

Posts: 18704
From: Lyons, IL, USA
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posted 01-06-2003 03:12 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I like to pi$$ down the carb before storage myself.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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SteveLaRiviere
Administrator

Posts: 31026
From: Saco, Maine
Registered: May 99

posted 01-06-2003 03:19 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
That's because you piss 10W40 anyway...

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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mustangboy
Gearhead

Posts: 520
From: Ont, Canada
Registered: Mar 2002

posted 01-06-2003 03:57 PM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
This is great info guys.I too was under the impression that there must be some ring/cylinder damage in that one cylinder when the oil brought it back up to 160.The engine was stored inside the guys garage but unfortunately he didn't put any oil in it that I can tell.I have not cranked the engine with the plugs in it,only rolled it by hand until I got the starter problem sorted out(Thanks Alex) and them I've only rolled it over with all the plugs out with the starter so I don't think I've damaged anything.Its not like it was seized up or anything.So if I start the motor(its still not installed) do you think the compression will come back fairly quickly if its going to, or would it take some time?I'm shipping the car out west to my sister once its done so I kinda have to know whats going on with the motor before I ship the car.And of course I'd like to know about the engine before I put it in

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69 Sportsroof
Gearhead

Posts: 982
From: Valley, Alabama, USA
Registered: Mar 2002

posted 01-06-2003 04:24 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
I like to pi$$ down the carb before storage myself.


As long as it's 93 octane or better...

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Moneymaker
Administrator

Posts: 18704
From: Lyons, IL, USA
Registered: May 99

posted 01-06-2003 07:08 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
It will be fine.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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bluestreek
Gearhead

Posts: 1086
From: Athens,GA
Registered: Jul 2001

posted 01-06-2003 07:42 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
I agree with Alex. Tune it up, crank it up, rev it up!!
It may smoke and run rough a few minutes while everything reseats, but if it was a good running engine with good oil pressure and it didn't take on any water, it should be fine.

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1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, ported TFS alum. heads, ported Stealth 8020 intake, CompCams Xtreme Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi, BFG Drag radials..

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steve'66
Gearhead

Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000

posted 01-06-2003 09:40 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
It will be fine.


I agree

SteveW

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