Weird question, Cam upgrade.

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Apr 8, 2007 | 10:54 PM

Nicholas1990

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Weird question, Cam upgrade.

Ok, I was searching through the Summit magazine and I noticed under the truck section "Crane Cam" for the straight 6.

http://store.summitracing.com/partde...5&autoview=sku

http://store.summitracing.com/partde...700+4294908314

What kind of Gas mileage, would I be looking at. I'm not looking for a street rod to suck down gas, just a small upgrade on the internals.

Please tell me what kind of stuff I would be getting into.

I've never really messed with a cam before, eh, there's always a first.

thanks in advance
-nick-

Apr 8, 2007 | 11:11 PM

eco

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From: The dark carnival

Assuming that you have speed density EEC-V, you need to be very carefull as to camshaft mods.

I did the same thing with a 302, then had to do a MAF conversion to make it work. The SD does not tolerate much change. If you already have MAF, then go for it.

Apr 8, 2007 | 11:21 PM

Nicholas1990

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I guess ill just not do it, I dont want to touch the injectors or anything. The thing is bone stock. I guess exhaust is my only option right now.

thanks
-nick-

Apr 9, 2007 | 12:50 AM

StealthWyvern

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What about a UDP set?

Apr 9, 2007 | 01:45 AM

eco

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From: The dark carnival

You do have some room to play with as far as the cam, but not that much, and if you do change the cam profile and keep the SD system, you will have some lean spots in the fuel maps, particularly towards WOT. You go too far like I did and the thing wont stay running at all below 1500 rpm. Or you can reprogram the SD computor to work with the cam, but I've never done that so I can't help ya there.

Apr 9, 2007 | 08:44 AM

Conanski

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From: Ottawa, Ontario

Quote:

Originally Posted by Nicholas1990

Ok, I was searching through the Summit magazine and I noticed under the truck section "Crane Cam" for the straight 6.

http://store.summitracing.com/partdetail.asp?part=CRN%2D503905&autoview=sku

http://store.summitracing.com/partdetail.asp?part=CRN%2D503905&view=1&N=700+4294 908314

What kind of Gas mileage, would I be looking at. I'm not looking for a street rod to suck down gas, just a small upgrade on the internals.

That cam would be a heafty upgrade over stock, and it should improve cruising milage due to increased torque at low rpms. But, the 112 lobe seperation angle will require mass air to run properly. A similar cam with 114 LSA would work with the existing SD efi system.

Apr 9, 2007 | 09:26 AM

Kemicalburns

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From: Bend,OR

i would go over to the 300-6 forum an find out what everyone is running there?

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Apr 9, 2007 | 12:42 PM

Conanski

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From: Ottawa, Ontario

Quote:

Originally Posted by pfogle

No.. you got that backwards. The SD computer wants a minimum of 114 deg LSA while the more forgiving mass air system will work with 112 or even 110 deg LSA... depending upon how radical the cam is. Stock Ford SD cams are all 115+ LSA.

Apr 9, 2007 | 12:46 PM

#10

pfogle

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From: Oak Harbor, OH

The 351efi cam is 114 degrees, from what I've read the SD is actually more like to run with the mods than the MAF system. They both have set parameters they operate by. The difference is the MAF system reads the air flow through the MAF sensor instead of the MAP sensor. The SD is preferred by most mustang guys because it's easier to tune.

Apr 9, 2007 | 01:16 PM

#11

Conanski

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From: Ottawa, Ontario

Quote:

Originally Posted by pfogle

..from what I've read the SD is actually more like to run with the mods than the MAF system. The SD is preferred by most mustang guys because it's easier to tune.

Again.. that's contrary to everything I have read and seen with the mustang guys I know.

Quote:

Originally Posted by pfogle

They both have set parameters they operate by. The difference is the MAF system reads the air flow through the MAF sensor instead of the MAP sensor.

Which.. if you think about it... means that the mass air system actually measures the airflow passing through a motor realtime and can adjust fuel and timing to it. The best the SD system can do is calculate(guess) the proper fuel mixture based on pre determined maps and a vacuum(manifold pressure) signal, which in not nearly as accurate. A 5.0 mass air computer will run a 351 no problems.. I have been driving it for 7 years. Both these motors will produce very similar vacuum signals, but the A/F ratio would be excessively lean on an SD computer without a chip or other programmer to tell the computer the engine displacement is larger.

Apr 9, 2007 | 01:21 PM

#12

pfogle

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From: Oak Harbor, OH

Yes, this is true. I also remember reading somewhere (can't remember where off hand) that the SD system has a richer base mixture as well.

I'm surprised that your 351 runs with the 302 computer. I've heard several people on here say that they had to tune the MAF computer to get it to run right. Which computer are you using the A9L?

Apr 9, 2007 | 02:01 PM

#13

Conanski

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From: Ottawa, Ontario

Quote:

Originally Posted by pfogle

I'm surprised that your 351 runs with the 302 computer. I've heard several people on here say that they had to tune the MAF computer to get it to run right. Which computer are you using the A9L?

I believe it's the A9P.. it's been so long since I have seen it I can't remember. It's the Ford Motorsports mass air kit using the mustang computer for automatic transmissions.

Apr 9, 2007 | 02:11 PM

#14

eco

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From: The dark carnival

Quote:

Originally Posted by pfogle

You have a couple degrees to play with as the computer is a little more friendly than the MAF computer. .

I know from first hand experience that the SD computor will not tolerate much change in camshaft at all where as the mass airflow system will adjust itself well to camshaft changes. My cam in my 302 has 110 LSA and I have the FMS mass air kit and unless my Interro 5 gas analyzer is misleading me my air fuel mixture is right on and my motor is running great. The SD system would not even run that motor below 1500 RPM and when it was running the AF ratio was very lean.

The reason that Ford is able to market and sell these mass air kits is due to their ability to adjust to mods like this.