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Author
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Topic: cam change = low oil psi
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BLACK65FORDFALCON
Gearhead Posts: 144
From: Sidney, B.C
Registered: Nov 2004
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posted 01-21-2006 07:56 AM
   
Ok my old cam was a 270H. My mechanic installed a comp magnum 282S along with the matching springs. He also added a new e-brock water pump, Double roller chain and timing cover. The problem is that now I have lost alot of oil pressure. With the old cam I had 30 at a hot idle and 55 psi at higher rpm's. With the new cam I only have maybe 15 at a hot idle and 35 to 40 psi at higher rpm's. Apparently the cam break in went well. However for some reason he broke the cam in for 10 minutes the first day and another 10 minutes the second day. Not to sure why he did that. He also broke the cam in with EOS (engine oil supplement) Which contains lots of zinc. Anyone have any ideas of why I have lost that much oil psi? Car appears to run OK, However I thought that I would of gained/felt a tad more power, But it definately dosen't feel like it. Any ideas. Thanks.
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steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-21-2006 10:07 PM
Is he using thinner oil now?SteveW
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BLACK65FORDFALCON
Gearhead Posts: 144
From: Sidney, B.C
Registered: Nov 2004
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posted 01-22-2006 01:05 AM
He used regular oil and a can of EOS (engine oil supplement - high in zinc) to break the cam in. Then he used 10/30 Mobil 1 synthetic oil. I have been using the Mobil 1 for a couple of years now without any problems, And with great oil psi.I don't know why my oil pressure has drastically dropped. I have a feeling that this damn engine is going to be opened up again... Trying to find out why my oil psi is low. Thanks once again.
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Scott H
Gearhead Posts: 901
From: Chicago area
Registered: Mar 2005
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posted 01-22-2006 06:10 AM
I've the opinion that cam manufacturers suggest a 20 minute break in period with straight 30 weight oil, no additives. Something about the lobes being work-hardened, which won't occur at low temps or if there is too little friction, like when you use an additive or synthetic oil.
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Hans olsson
Gearhead Posts: 733
From: Sweden
Registered: Apr 2000
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posted 01-22-2006 12:41 PM
Try a different oil filter and see what happens.------------------
- VIN 1F05M139343
- 71 Mach 1 Ram-Air
- 351C 4V 285 HP
- E,F,G/SA
- Stockers are way cool!
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buening
Gearhead Posts: 175
From: Decatur, IL
Registered: Mar 2005
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posted 01-23-2006 08:08 AM
If you ask me it sounds like he changed the oil pump from a high volume to a standard unit. What you are getting now is normal for a standard volume oil pump.------------------
1970 Grabber Blue Mach 1 H-code
1970 Fastback
2003 Torch Red Mustang
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BLACK65FORDFALCON
Gearhead Posts: 144
From: Sidney, B.C
Registered: Nov 2004
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posted 01-23-2006 12:50 PM
I am 100% sure that he didn't change the oil pump. I would be very hesitant to be changing gears at 6500 RPM'S with only 35 psi of oil, When I used to have 60 psi.The other problem is that it takes the oil psi a long time to climb up when at an idle. Before the cam swap I could barely touch the gas petal and the oil psi would jump up right away. Now it takes several seconds of driving before it even moves at all, And it only goes to 35 where I am used to 60.
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68 Coop
Gearhead Posts: 3354
From: Mesquite, NV. 89027 M&M# 4256
Registered: Oct 2004
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posted 01-23-2006 09:54 PM
This is to compare #'s only, but my stock internally 289 idles at 50 psi, and goes up to around 55/60 when I am running. Is there any chance the pump got loose some how??? Sorry, I'm just guessing more than anything.  ------------------
William
The easiest way to find something lost, is to buy a replacement. 68 Coupe
289
C4
2:79 rear gears
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Mark Ugrich
Journeyman Posts: 26
From: Waukesha, Wisconsin,U.S.A.
Registered: Jan 2006
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posted 01-23-2006 10:38 PM
A cam change if done correctly should not change the oil pressure in the engine. A couple of thoughts here would be the wrong lifter, in other words the oil hole on the lifter is not at the right height to match the oil galley. Another place to look would be the two oil galley plugs behind the timing gear, possibly they were loose or damaged during the cam installation.
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Ryan Wilke
Gearhead Posts: 2494
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 01-24-2006 09:34 AM
What about the possibility of some timing cover gasket material falling into the oil pan and now the pickup screen is partially plugged off?I think I'd drop the pan and inspect the oil pickup screen...... Ryan 
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Mark Ugrich
Journeyman Posts: 26
From: Waukesha, Wisconsin,U.S.A.
Registered: Jan 2006
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posted 01-24-2006 09:51 AM
Check to make sure the camshaft retainer plate is installed with the oil groove facing the correct direction also.
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73torinoqcode
Gearhead Posts: 434
From: Buffalo,NY,USA
Registered: Jun 2003
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posted 01-24-2006 03:40 PM
I would also check the oil line that goes to the gauge and make sure you did not pick up somthing which is obstructing the line itself. I have seen it happen before.
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Ryan Wilke
Gearhead Posts: 2494
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 02-02-2006 03:00 PM
Did you ever determine the cause of the abnormally-low oil pressure issue? What was causing it......?
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BLACK65FORDFALCON
Gearhead Posts: 144
From: Sidney, B.C
Registered: Nov 2004
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posted 02-03-2006 11:12 AM
I am going back to the shop today to see what is up with my car. He last said that he is going to re-set the valves because the valvetrain was so noisy, And was going to look at any obvious reasons why the oil psi is much lower than it was before with the old cam.I will keep you all updated. Thanks.
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Whitson
Gearhead Posts: 110
From: Western Canada
Registered: Dec 2005
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posted 02-03-2006 12:04 PM
quote:
Originally posted by Mark Ugrich:
Check to make sure the camshaft retainer plate is installed with the oil groove facing the correct direction also.
That's an idea! Maybe he's a cheby guy and forgot to put the cam plate back on completely!! 
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Mark Ugrich
Journeyman Posts: 26
From: Waukesha, Wisconsin,U.S.A.
Registered: Jan 2006
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posted 02-03-2006 10:48 PM
I hate to even say this , but I hope he didn't ding a cam bearing installing the new cam. If the oil pressure was o.k. before something had to change to effect it. Good luck,Mark
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