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  #1 (permalink)  
Old 01-30-2008, 07:19 PM
priobe's Avatar
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Cobra Make, Engine: E-M Cobra Ford FE 427 w/ Webers 48 IDA
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patrickt,

Thanks for the info on the oil pressure. That makes me feel a whole lot better.

As for the leakdown test I will call him tomorrow to find out more specifics about this.

As for the cam, do you feel that it is good or should I change it?
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Old 01-31-2008, 04:41 AM
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Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
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Quote:
Originally Posted by priobe View Post
patrickt,

Thanks for the info on the oil pressure. That makes me feel a whole lot better.

As for the leakdown test I will call him tomorrow to find out more specifics about this.

As for the cam, do you feel that it is good or should I change it?
I recall from previous posts that you were having problems with your Webers, a miss at 3500 or something like that, and that you felt your cam was not the best choice. Can you give us an overall description of just how your engine runs, idles, pulls at different rpms, etc.? You only have 500 miles on your engine -- that's brand-spanking-new. Nevertheless, a 26% loss on the leakdown is something that requires further investigation. You generally like to see the cylinders hold something in the 90's (when you pressurize them to 100psi); a big FE, maybe in the 80's. Going all the way down to the 70's though raises an eyebrow. I'd like to see the leakdown for all 8 cylinders. If six are high and two adjoining cylinders are low, that tells you something. Likewise if the kid tells you "Man I could hear air whistling out the passenger sidepipe when I did #2 and #4, but all the others did well." You get the idea.

Last edited by patrickt; 01-31-2008 at 06:14 AM..
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Old 01-31-2008, 06:41 AM
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Default Tight motor and low oil pressure

Priobe You are making this easier. The motor is new with 500 miles. Nothing is seated yet. The piston rings are not worn in, the valve seat and valves are not broken in to seat. You didn't say what temp the motor is running at. The motor is tight to start. I don't agree with Pat on the oil pressure at idle. I just put a stroker kit in my Shelby block 482. I am using the same pump and oil on the new parts. The new bottom end is tight but I still have 30-35 psi at idle, 850 rpm and goes to 80 before 2,500 rpm. This is a HVHP pump from Mellings. Go to the FE forum and ask about the rod and main bearings there. Barry R, John V, or a couple of the others are involved with FE motor since the 60's. If your oil gauge is reading correct at idle IMO you will pound out the bottom end bearings. Call Barry R and ask what a custom set of pistons cost for the rods and crank you have. Tell him the cc on the heads. Get the compression up to 10 1/2 with the aluminium heads. Next look for a cam in the .600" lift. Look for a power range from 2,700rpm to 6,200rpm. A 112 LSA with a -2 cam retard after the cam is installed. Some cams come with a 4degree retard built into them. As for the idiot oil lights coming on at 4-10 psi, If you see this light the party is WAY OVER. What oil are you running and is there any additives? 600HP is not easy to hit, I am talking REAL NUMBERS with a streetable 427 motor. My 482 motor is new and I hope to get it on the dyno in April. On dynosim and Dyno 2000 I am looking at 510 HP and 580 torque at the crank not RWHP.My FI system may cost me about 8-10hp and 5-8ft of torque over a good carb. My cam is a 587-607 roller. great power from 2,500 to 6,000 rpm with a 6,500 rev limiter. The ford number for the nascar rod bearing is C9AX-6211E or F. You could try Rich Kirk or H&M for the correct bearings. I have heard they are very hard to fine. There are also questions about the nascar crank being crossdrilled and causing alot more oil pressure drop in the motor. I will catch you later Rick L.
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Old 01-31-2008, 06:53 AM
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Quote:
Originally Posted by RICK LAKE View Post
I don't agree with Pat on the oil pressure at idle...
That's what makes this forum fun.


Quote:
Originally Posted by RICK LAKE View Post
Go to the FE forum and ask...
... and you might find this post on oil pressure at 332-428 Ford FE Engine Forum

Quote:
The Ford shop manual 1970 (has Boss 02/429/428cj/scj/429cj/scj) great ref. materia ... correct psi is 25-60 lbs @2000rpm HOT...minimun psi is 6lbs at 400 rpm , lifter collapse, valve train noise. Bearing clearances of .0025/.003 will result in 10-15 lbs at hot idle, and 65lbs at 2000...
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