Re: 440 Compression Test Results
[Re: ringo440]
#2066742
05/03/16 09:34 PM
05/03/16 09:34 PM
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Joined: Nov 2005
Posts: 235 ga
ringo440
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enthusiast
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OP
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O.k. talked to the owner of the car today and got a little more history about the car,He was not sure what cam is installed but the guy that built it told him it was a big one. Ask if had any other problems in the past and he told me that he had a electric fuel pump on it and it ran 6psi , which I think was fine, but he said they took it off a couple of weeks ago and put a mechanical pump on because after the car set over night there would be gas on the intake, he said it was like pressure would build up and push it out thottle shaft. Changed to a mechanical pump and no longer has gas on intake, So my thinking is it was probably leaking gas into intake and was washing the cylinder walls down and it got the rings. And that's the cause of the low readings.I am going to try a leak down test the next day or so.
Last edited by ringo440; 05/03/16 09:38 PM.
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Re: 440 Compression Test Results
[Re: ringo440]
#2067422
05/04/16 09:23 PM
05/04/16 09:23 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Already changed valley pan gasket. That is was my first move Wrong stagger on rings would be a impossible thing. even if installed with all the gaps lined up with in about 10 revolutions they would no longer be in the same position as the rings constantly turn in the lands. Remember that this is engine that had been running good so IMO this eliminates a improper cam install. A blown or leaky head gasket would not effect all cylinders either.
Clean it, if it's Dirty. Oil it, if it Squeaks.
But: Don't fix it, if it Works!
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Re: 440 Compression Test Results
[Re: ek3]
#2067464
05/04/16 10:21 PM
05/04/16 10:21 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Back in the day the literature frequently referenced "taking it out & blowing the carbon out of it" With the oil burning happening all of a sudden I'd stay after that as some gasket somewhere let loose & I'd find/fix that then onto the low comp. I would do a leakdown tho I'm wondering if fubared oil rings will show definitively on that % & I'm sure it will to some extent but we gotta keep after it with what we got till something develops. As said it might be as simple as low DCR but that is real low numbers. keep us posted!
live every 24 hour block of time like it's your last day on earth
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Re: 440 Compression Test Results
[Re: ringo440]
#2067517
05/04/16 11:19 PM
05/04/16 11:19 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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the grey points more toward fuel enrichment, like you see when your behind someone & they floor it.
live every 24 hour block of time like it's your last day on earth
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Re: 440 Compression Test Results
[Re: ringo440]
#2067575
05/05/16 01:08 AM
05/05/16 01:08 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Alright, I keep coming back to the valley pan tho not sure about valve stem seals (not convinced but I would check them) & they as the culprit would be more likely to show up on decell (I'm assuming it smokes all the time)
live every 24 hour block of time like it's your last day on earth
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Re: 440 Compression Test Results
[Re: MoparforLife]
#2067629
05/05/16 09:47 AM
05/05/16 09:47 AM
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Joined: Nov 2013
Posts: 596 Nashville, Tennessee
Tempest
mopar
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mopar
Joined: Nov 2013
Posts: 596
Nashville, Tennessee
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Already changed valley pan gasket. That is was my first move Wrong stagger on rings would be a impossible thing. even if installed with all the gaps lined up with in about 10 revolutions they would no longer be in the same position as the rings constantly turn in the lands. Remember that this is engine that had been running good so IMO this eliminates a improper cam install. A blown or leaky head gasket would not effect all cylinders either. Ditto. It makes us feel better we stagger them when we assemble but you are correct, they turn.
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Re: 440 Compression Test Results
[Re: ringo440]
#2067663
05/05/16 11:12 AM
05/05/16 11:12 AM
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Joined: Jun 2006
Posts: 5,170 CT
GTX MATT
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master
Joined: Jun 2006
Posts: 5,170
CT
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Plan on leak down test tomorrow. when I done the compression test (I have done four so far and got same reading each time).If it was just blue smoke I would say oil.But it seems to be more bluish gray.Vacuum gauge shows 5 to 10 very rapid between the two at idle.bring engine up to about 2000 rpms and vacumn smoothes out at 15. It is like the exhaust valves are not closing all the way.I could see this happen to one head but not both. Leak down test tomorrow we will see. That is a very large jump/swing in vacuum. It sounds to me like it has poorly seating valves, sticky valves, worn guides, worn springs, a burned valve, or some combination of this. Some valve issue IMO. You need to check all 8 too, 1 may be higher or lower and tell us something.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: 440 Compression Test Results
[Re: ringo440]
#2067969
05/05/16 09:31 PM
05/05/16 09:31 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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master
Joined: Sep 2014
Posts: 4,457
Washington
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Dead rich. Needs more timing.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: 440 Compression Test Results
[Re: dogdays]
#2068025
05/05/16 11:07 PM
05/05/16 11:07 PM
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Joined: Nov 2005
Posts: 235 ga
ringo440
OP
enthusiast
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OP
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Joined: Nov 2005
Posts: 235
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Photos show plugs darker in photos than they are, I showed plugs because someone asked what they looked like and to show it was not rich. That didn't work out from the photo. I couldn't get the camera down in ports to show the valves so plugs was it.As far the timing goes . When it showed up the timing was one of the first thing I checked. It was set at 42% btc. And the advance was not working. It has MSD distributor and someone set it up with the advance locked out and weights removed. The car started fine the starter spun over fine , Makes me think the cam wasn't degreed in when built. The owner had the weights and spring so reinstalled them and now I have 18 btc at idle and 34 btc at 3000. So much on this engine is over done for the way the guy drives it. Six pack carb setup ,big tube headers,3 inch exhaust,big cam, 5 speed Trans he never turns over 3000 rpms , Drives it a lot on interstate said it turns about 1800 at 70 MPH. With the A/C on
Last edited by ringo440; 05/05/16 11:27 PM.
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Re: 440 Compression Test Results
[Re: ringo440]
#2068046
05/05/16 11:48 PM
05/05/16 11:48 PM
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Joined: Jan 2003
Posts: 5,791 Hamilton, Ontario Canada
Magnum
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master
Joined: Jan 2003
Posts: 5,791
Hamilton, Ontario Canada
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Read the instructions again today,remove one plug installed gauge crank engine over until needlle on gauge no longer moves, write down reading replace plug go to next cylinder and repeat. But just for giggles I removed all plugs and took reading, Got same reading as with the plugs installed, Also checked gauge by installing it in the stock 440 in my Daytona got a reading of 130 only checked one cylinder, but is the readings I felt I should be getting on the Challenger engine This is great feedback. It tells us many things. For one, there are often more than 1 way to get great results. 2, you have a great starter and battery. 3, There will never be a mix up of firing order with your method.
69 Super Bee, 93 Mustang LX, 04 Allure Super
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