How to pick a CAMSHAFT for EFI - Ford Bronco Forum
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post #1 of 118 (permalink) Old 09-30-2003, 04:12 AM Thread Starter
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How to pick a CAMSHAFT for EFI


For a good fuel injection truck cam:
intake duration @ 0.50" should be kept at or under 210
Gross valve lift should be kept under 0.500
Lobe seperation should be at or above 114

Good 5.0L/5.8L (302/351) EFI hydraulic flat tappet cams:

Comp Cam 35-255-5
* Duration at .050 in.: 210 / 214
* Gross valve lift: 0.478 / 0.485
* Lobe separation: 114


Edelbrock 3782
* Duration at .050 in.: 210 / 216
* Gross valve lift: 0.469 / 0.484
* Lobe separation: 116


Crane Cams 444232
* Duration at .050 in.: 206 / 214
* Gross valve lift: 0.448 / 0.464
* Lobe separation: 114


Best 5.0L/5.8L (302/351) Roller EFI cam:
89-95 Mustang 5.0L HO
Ford Part numbers: E8ZE-6250-CA / F1ZE-6250-AA / F4ZE-6250-DA
* Advertised Duration: 276 / 266
* Duration at .050 in.: 214 / 210
* Gross valve lift: 0.444 / 0.444
* Lobe separation: 115


Good 7.5L (460) EFI cam:
Comp Cam 34-255-5
* Duration at .050 in.: 212 / 219
* Gross valve lift: 0.490 / 0.495
* Lobe separation: 114

-------------------------------------------------------

Stock 302
* Duration at .050 in.: 210 / 211
* Gross valve lift: 0.421 / 0.447
* Lobe separation: 116

Stock 351
* Duration at .050 in.: 206 / 221
* Gross valve lift: 0.440 / 0.450
* Lobe separation: 115

Lightning
* Duration at .050 in.: 198 / 208
* Gross valve lift: 0.416 / 0.445
* Lobe separation: 114

96-01 Explorer 5.0L HO roller
Ford Part numbers: F4TE-6250-BA
* Advertised Duration: 256 / 266
* Duration at .050 in.: 186 / 197
* Gross valve lift: 0.422 / 0.448
* Lobe separation: 116

Stock 460
* Duration at .050 in.: 193 / 206
* Gross valve lift: 0.438 / 0.459
* Lobe separation: 111? (unsure at this time)

-------------------------------------------------------

Linkbar lifters can be used to retrofit a roller cam into an older block
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post #2 of 118 (permalink) Old 09-30-2003, 08:44 AM
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Re: How to pick a CAMSHAFT

Quote:
Originally posted by Fireguy50

Good 302 cam:
Comp Cams 31-255-5
* Duration at .050 in.: 206 / 212
* Gross valve lift: 0.462 / 0.474
* Lobe separation: 114

That's the cam I put in. I like it, it works well with my GT-40 heads and I still have a good idle. I recommend it!

MM

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post #3 of 118 (permalink) Old 09-30-2003, 10:22 AM
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what would you recomend as a versitile cam that would add HP to an engine with few mods such as just dual exaust and K&N intake?

1989 XLT Red/Tan 5.0L 302 stock on chrome 15x10 rims and 33x12.5 mud terrains
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post #4 of 118 (permalink) Old 09-30-2003, 12:24 PM
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Picking a cam should be bases on all the vechicle specs and the driveing disires of the owner. Most inportant factors when pickin a cam are compression ratio, gear ratio, weight, stall speed, head flow, and what you want to do with it.


Best thing for a novice to do is call up a cam company and get a recomendation.
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post #5 of 118 (permalink) Old 09-30-2003, 12:27 PM
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Quote:
Originally posted by Tunedup

Best thing for a novice to do is call up a cam company and get a recomendation.

Yup, that's kinda what I did, I got a lift recommendation from a buddy helping me with the engine swap and had heard the same thing about the lobe seperation fireguy already hit on. Called Summit, and they found a good one for me. But I would recommend calling the cam place directly, they know more about their products them summit would.

MM

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post #6 of 118 (permalink) Old 09-30-2003, 07:36 PM Thread Starter
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Quote:
Originally posted by Tunedup
Picking a cam should be bases on all the vechicle specs and the driveing disires of the owner. Most inportant factors when pickin a cam are compression ratio, gear ratio, weight, stall speed, head flow, and what you want to do with it.
That is so wrong! You can "desire" to go as fast as you want. But if you have the stock truck computer you are limited as to what you can do. The cams I listed above are about all you have to choose from. If you have a carb, or feel like spending $750-$3000 on programmable EFI you can pick out what ever cam you want.
Ryan
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post #7 of 118 (permalink) Old 09-30-2003, 08:09 PM
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Quote:
Originally posted by Fireguy50
That is so wrong! You can "desire" to go as fast as you want. But if you have the stock truck computer you are limited as to what you can do. The cams I listed above are about all you have to choose from. If you have a carb, or feel like spending $750-$3000 on programmable EFI you can pick out what ever cam you want.
Ryan

Picking a cam with dur below 210 and ls above 114 will not get you the best performing cam for your buck. You might as well said pick up a cam catalog and pick a cam thats for a stock/mildly modified efi motor. I just pointed out that you need to consider many things when picking a cam. And unless you have years of experiance you should call up and let an "expert" help you in the right direction. Desire = how much time, effort, and money, you want to sink into it.

You go up to a guy running a professional mud drag truck and tell him he has to run a cam with 210@050 and 114lsa your gonna get laughed at.
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post #8 of 118 (permalink) Old 09-30-2003, 08:23 PM Thread Starter
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Re: How to pick a CAMSHAFT

The very first line I typed was:
Quote:
Originally posted by Fireguy50
For a good fuel injection truck cam:
I never said anything about mud drags. Anyone running fuel injection on a mud drag vehicle is too stupid to worry about picking the correct cam.

If anyone buys a higher performance cam than the above limits for a stock truck computer, they will ruin the dependability of the truck. Fuel ratios will be way off, and idle will be so bad the owner will sell the truck.
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post #9 of 118 (permalink) Old 10-25-2003, 12:34 AM
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Duration____________Lift_______________Lobe
Intake-Exhaust------Intake-Exhaust-------Seperation
204*__214*______.448"__.472"______112*

I have this cam in the 302 in my bronco II. I am planning on pulling that engine out and putting it in the bronco, with all the EFI stuff from the big bronco.
This cam won't work with the speed density will it, cause of the lobe separation?

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It's got safety tubes, but I ain't scared, Brakes are good, tires fair... "Hot rod Bronco"
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post #10 of 118 (permalink) Old 10-25-2003, 01:31 AM Thread Starter
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nope, you can try it, but...
you'll swap that cam out
AND I'll say "I told ya so"
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post #11 of 118 (permalink) Old 11-16-2003, 05:24 PM
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what about a good ca emsission cam?

Quote:
Originally Posted by dogonmut
...I refinanced my house to do this...no not kidding.
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post #12 of 118 (permalink) Old 11-17-2003, 04:51 AM Thread Starter
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Quote:
Originally posted by Hdpsd
what about a good ca emsission cam?
Not a good idea. :( I'd stick to simple improving flow if you live in CA. My reasoning is that any cam that would pass CA inspection and keep the computer happy wouldn't be much of an improvment over stock. make sence?

Quote:
Originally posted by freak
You forgot to mention Crower cam's
I didn't know they made any cam's to keep Speed Desnity EFI happy. You got any links, info, ect?
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post #13 of 118 (permalink) Old 11-17-2003, 01:22 PM
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Comps Speed Density Camshaft
Same part number as Ryan mentions. I was told it was a cam that would work well with speed density. I'm running it currently.

Lobe center 114, duration 250int. 260exh. .462int. & .474exh.


Part # 31-255-5
Grind # FS XE250H-14
post #14 of 118 (permalink) Old 11-19-2003, 03:53 PM
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Quote:
Originally posted by Fireguy50
Not a good idea. :( I'd stick to simple improving flow if you live in CA. My reasoning is that any cam that would pass CA inspection and keep the computer happy wouldn't be much of an improvment over stock. make sence?
Are you saying that putting in a mild cam for a 302 WILL give you problems with CA smog testing?

I am no expert on this but why would it have problems with emissions? Would you mind explaining a bit... The cam won't/can't run the truck richer on a stock EFI right? The computer controls the mixture and stock factory settings prevent that. Before I say anymore and confuse myself I'll let you set me straight.

1986 XLT 320,000k miles and rolling, @ 304,000k the motor finally went... Other than that... bone freaking stock, orginal and well traveled....
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post #15 of 118 (permalink) Old 11-19-2003, 06:36 PM Thread Starter
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A mild cam wouldn't necisarily make you fail an emmsions test. But why put in a mild cam without intake and exhaust mods would yeild much of an improment.

I did saying not to......
I'm saying the work and money involved in a mild cam wouldn't give much of a gain.
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post #16 of 118 (permalink) Old 11-19-2003, 07:04 PM
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Quote:
Originally posted by Fireguy50
A mild cam wouldn't necisarily make you fail an emmsions test. But why put in a mild cam without intake and exhaust mods would yeild much of an improment.

I did saying not to......
I'm saying the work and money involved in a mild cam wouldn't give much of a gain.
Would then the whole package (cam, intake, exhaust) make you fail CA emission testing? Are you able to make both intake and exhaust mods and still pass smog from an emissions standpoint??

And then as far as a viz inspection I think I could get away with headers and they probably wouldn't notice anything else.... Or would they.... Maybe I don't have a proper visual on what these mods would look like under the hood.... But say nothing on the outside is changed; All I ever remember "them" looking for is pipes, O2 sensor cat, muffler etc.... And there's no reason you can't put all that on and maintain performance and flow right???

And to finish the questions.... It seem like doing one mod is a slippery slope. Can't do cam with out intake, can't do intake without exhaust etc.... so is it better to do all or nothing? Or can there be a middle ground where one can build a good-solid- long running motor making the improvements Ford couldn't back when my truck was originally put together.....

1986 XLT 320,000k miles and rolling, @ 304,000k the motor finally went... Other than that... bone freaking stock, orginal and well traveled....
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post #17 of 118 (permalink) Old 11-19-2003, 09:41 PM Thread Starter
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You can buy headers, cam and intake all with CA smog legal papers.
And in my book: intake / cam / exhaust is all a starting point. I don't consider sliding down the slope untill you change heads / displacment / compresion - ect.

Camshaft is never a starting point. The stock cam can outperform the intake and exhaust, and possible the heads. you have to look at the total package and replace the week points. Cam is far down the line in weak points
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post #18 of 118 (permalink) Old 11-01-2004, 08:19 PM
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I thought about doing a cam swap in my 94 302. My books say it has a .380"/.396" lift. But I think it has a factory roller cam. Would it be a good idea to swap in a cam with higher lift that has flat tappets? Or does someone make a speed density friendly roller cam for it?
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post #19 of 118 (permalink) Old 11-01-2004, 08:28 PM Thread Starter
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you have a 94 5.0L with a roller cam?
Are you sure you don't have Mass Air?
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post #20 of 118 (permalink) Old 11-01-2004, 09:12 PM
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Quote:
Originally Posted by Fireguy50
you have a 94 5.0L with a roller cam?
Are you sure you don't have Mass Air?
Well I'm pretty sure its speed density. There is no air meter between the filter and the throtle body. I ain't 100 % sure about the roller cam though. Thats just what I have heard from everyone.
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