How to pick a CAMSHAFT for EFI - Page 3 - Ford Bronco Forum
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post #41 of 118 (permalink) Old 02-02-2011, 05:49 PM
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Originally Posted by plug ugly View Post
so the corral guys say the mustang HO cam is not a good one for the 5.8. They say it moves the power curve too far up the rpm range, and is not at the low end. If one wants a striclty low end cam with a 5.8 and gt40 heads and intake with mustang MAF, what is the best route? Still the mustang cam cause the mustang guys dont know big heavy trucks??
IMHO the Mustang HO cam is a good upgrade from a stock Hyd. flat tappet cam or the aftermarket Hyd. Flat tappet Cams for our rigs. IMHO there are better aftermarket Hyd. roller cams than the stock Stang HO for our rigs.

i also believe you get better mileage when the power comes-on down low in the RPMS vs. having to spin it faster to get the same power. Higher revs mean more combustion strokes per min. thus more fuel to get the same power.

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post #42 of 118 (permalink) Old 02-02-2011, 09:17 PM
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Crane cams for EFI, good descriptions of what you'll get. I like the HR-216/325-2S-12 as a better than stock replacement and the 2020 & 2031 if you have good head, exhaust, and intake.

http://www.cranecams.com/204-211.pdf

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post #43 of 118 (permalink) Old 02-11-2011, 01:54 PM
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If you have relevant information to add to this thread then please post. Please do not use the thread for asking what cam to run in your Bronco.

Last edited by Ranger429; 02-11-2011 at 01:57 PM.
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post #44 of 118 (permalink) Old 02-11-2011, 11:10 PM
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Those who tell you the factory 5.0 HO cam is no good are usually trying to sell you something else. I have done a few roller 5.0 conversions (engine replacements) in Broncos and F150's using the HO camshaft. Great torque and drivability. For a mild boost, I use 1.7:1 bolt-on roller rockers and Isky 3105D springs. Has anyone on here tried Isky's hyd. roller cams?
For my 5.0 HO SD conversions in Broncos I have used the Isky # 317252/257 cam (252/257deg adv. 204/210deg @ 0.050", 112 deg LCA, 0.465/0.480lift). Great mid range improvement with nice idle and good vacuum.
If I used Mass Air conversion on a 5.0 HO in a Bronco, I would use the Isky # 317257/265 (257/267deg adv, 210/218deg@ 0.050", 112 deg LCA and 0.480/0.500lift). Also works good in 5.8 SD F 150's we have here with the roller lifter conversion.
If I can buy a 95 - 96 MAF 5.8 Bronco I might use Isky #317265/275 (265/275deg adv. 218/228deg @ 0.050", 112deg LCA and 0.500/0.520 lift with TFS TW heads and appropriate pistons in the rebuild.
I have run Crane, Comp and Crower cams too. If I seem biased to Isky cams, its because I always get what I want out of their cams, they are reliable and I get a factory direct deal thats hard to beat.
Swat, perhaps you could run some of these Isky grinds and see what you come up with. I'd be interested to find out what they are like compared to Comp, etc.
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post #45 of 118 (permalink) Old 02-14-2011, 03:43 PM
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Originally Posted by AussieFSBracer View Post
Those who tell you the factory 5.0 HO cam is no good are usually trying to sell you something else. I have done a few roller 5.0 conversions (engine replacements) in Broncos and F150's using the HO camshaft. Great torque and drivability.
The HO cam is a good upgrade from a stock flat tappet cam.

IMHO there are better cams for pulling and trails. That is written with my limited knowledge/experience with a manual tranny. I have never played with an auto tranny, torque converter and different stall speeds......................... makes a huge difference.

Isky roller cams (found 'em 371 series not 317 & the catalog downloads today) I like what you have chosen, torque down low in the RPMs.

371252/257



371257/265



371265/275



Bigger pictures and all I have run this far are here: http://www.supermotors.net/registry/3612/75870

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post #46 of 118 (permalink) Old 02-15-2011, 03:18 AM
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OOOPS. Next time I be wearin' my readin' glasses

Nice torque and power curves...... I noticed they pull hard from 1500 or so thru 3000 rpm real nice, in the F150 the 371257/265 is a great towing cam with lots of low and mid range torque. Thanks Swat, great job

I have had the pleasure of meeting Ed Inskenderian in person, and he took me on a personalised tour of the factory. He is a nice guy and VERY smart when it comes to camshafts and related gear. Thats why they call him "The Camfather"
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post #47 of 118 (permalink) Old 02-17-2011, 08:32 PM
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those are really nice curves.

Stupid is as Stupid does

mostly a 94 Bronco
wt4wheeling
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post #48 of 118 (permalink) Old 02-18-2011, 01:21 AM
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Nice beefy torque curve right in the RPM range that moves a heavy Bronco along nicely.
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post #49 of 118 (permalink) Old 03-17-2011, 03:28 AM
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Hi,
Ive been interested in getting a new camshaft for my 1995 bronco with a rebuilt 5.8L with EFI, Ive been searching around asking some local mechanics and they sent me to going onto the manufactures website and asking them for there recommendation. I went on comp cams and did a quick write out for them on my truck. 1995 Bronco, EFI 5.8L, stock heads with minor porting/polishing, roller camshaft and lifters, auto trans (E4OD), 3.55 gearing, running 33" tires and I said the trucks being used as a daily driver, weekend off-roading, and the odd towing use, and that I am concerned about fuel economy they gave me a recommendation of the part# 35-512-8 for my purposes. I cannot read this to be able to tell exactly what I should be able to expect this camshaft to do. Im trying to read up as much as I can on camshafts but Im just being overwhelmed. thanks for any help Im also looking for suggestions, feel free to P.M me


COMPCAMS 35-512-8
RPM Range: N/A
Valve Timing: .006
Lobe-Center Angle: 114
Intake Centerline: 110
. Intake --- Exhaust
Valve Lash: .480 --- .480
Duration: 258 --- 264
Duration @ .050" Lift: 206 --- 212
Valve Lift: .480 --- .480
Lobe Lift: .300 --- .300

http://www.compcams.com/Company/CC/c...csid=1446&sb=0


thanks
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post #50 of 118 (permalink) Old 05-08-2011, 11:32 PM
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For anyone who's got a Speed Density 302 roller block there really aren't many cams available. Crane has a version of the 2020 cam that's pretty close to stock, but you can call CompCams and they will do a custom grind of any Windsor cam to the 302 firing order. I just ordered a 35-512-8 in the 302 order for the same price as the Windsor cam.
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post #51 of 118 (permalink) Old 05-11-2011, 10:57 PM
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Just to add to this discussion:

I am running a 351 F4TE roller block with GT40 heads, stock 5.8L intake, long tube headers and custom exhaust.
The cam I have is the Crane 2020 mated with 1.6 roller rockers. http://www.cranecams.com/204-211.pdf
Believe it or not, I am running this setup on a completely stock 302 ECU. (1990) Factory speed density. The 351 ECU I tried didn't run quite as well.
The cam has a very mild lope to it at idle. I suppose MAF would reduce some of that but it sounds sweet the way it is. It runs great through 5400rpm and this setup has really good low end torque with the power fading above 5k.
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post #52 of 118 (permalink) Old 06-05-2011, 04:59 PM
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One good way to optimize the selection of a camshaft is: going roller(less powertrain friction).

Another is to know your stroke and rod length. Also note the piston position in crank rotation wrt TDC. The point at which the rod centerline is orthagonal to the crank stroke. To main centerline is where the piston velocity is greatest. This is where you want you maximum lift in you cam lobe to take place. Assuming your heads are matched to CID and ported/ flowbenched to the engine's intended use. The Duration will be driven by how well the cylinder head flows over valve lift intervals. If the flow drops off and has a sharp peak/ drop off, added duration doesn't do much for you. The same can be said for Lobe centerline separation angle, too little and you'll have too much valve actuation event overlap, thus bleeding off some intake manifold and port flow at the low end of the powerband. This is ok for lighter cars that will be built to revv. It is not the best choice for 5000+ lb SUVs like the Bronco. Low to mirange torque is needed to get full operation out of these beasts. We don't have the luxury of 4 valve per cyl heads with variable valve timing and variable tune intakes like newer cars...these allow for wider powerbands. We are stuck with older tech so we are given limited options.

<b>Done:</b> 5.8 Roller shortblock, Ported GT40X heads,edelbrock intake, Roller rockers, Coated JBAs and Bassani Y pipe, Bassani aft back,sixlitre tune up, beefed up AOD (<b>planned</b> 4in lift, 33x12.5s, 96 eddie bauer leather int, sound sys, supercharger, new gears, explorer injectors, MAF conversion.) [SIGPIC][SIGPIC]
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post #53 of 118 (permalink) Old 07-06-2011, 11:51 PM
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Any reason why a lobe seperation of less than 114 cant be used for a speed density truck?

http://memimage.cardomain.net/member...920_1_full.jpg

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post #54 of 118 (permalink) Old 11-11-2011, 08:13 PM
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how would a x303 cam from ford work with a 302 with gt40 head or something that flows better then stock. would i have to get bigger injectors. it is mass air so would have to go bigger on it to i guess. i am looking for more power/ torquewith a good lope at idle. any help would be great.
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post #55 of 118 (permalink) Old 12-17-2011, 02:13 PM
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My setup (will be) stock bottom end, GT40p heads, edelbrock intake, headers/single 3 in exhaust on a 93' 351. Is there any real benefit over the stock cam on a mild build like this?

also taking into account that it's speed density/ flat tappet and i don't intend to swap anytime soon

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post #56 of 118 (permalink) Old 04-02-2012, 12:26 PM
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Rocker Ratio???

There is only a 6.25% difference in lift in going from a 1.6 too a 1.7 rocker. The difference may squeak a little more speed for racing but it's pretty small. I ran my engine, in Desktop Dyno 2000, without the blower, and the results are below. I added 6.25% more lift in the second screen shot. Remember the limits of a simulated dyno. Looks to be a small difference.



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post #57 of 118 (permalink) Old 07-25-2012, 11:54 AM
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Any chance you could run those dyno files with a e303 cam? If not, happen to still have those dyno files? It would be real helpful for re-creating exact comparisons.

My Bronco is setup with a NP435 trans, Atlas 3.8:1, 4.11 gears and 37" boggers. I spend most of my time in high range 1st and 2nd gear, usually mid to upper RPM range - I'm thinking the e303 may help me in that area, but looking at the factory 96' cam I'm curious which will work better. All that torque sure is appealing...

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post #58 of 118 (permalink) Old 10-12-2012, 02:56 AM
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http://www.jegs.com/i/Edelbrock/350/2281/10002/-1 I Ordered this cam today for my future 408w build. Edelbrock #2281 Rolling Thunder series Roller cam.In. 235 Ex. 238 at .050 ,Advertised In. 299 Ex. 302,In. Lift .573 Ex. Lift .583,112 Lobe seperation . Seen the HorsepowerTV build of a 408w with 10:1 comp. Alm. heads,and roller rockers,And a performer rpm intake.I was sold! 468HP and 502 Ft. Lbs. of torque.http://www.powerblocktv.com/player/s..._num=HP2012-11
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post #59 of 118 (permalink) Old 10-12-2012, 10:13 AM
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Quote:
Originally Posted by KyleQ View Post
Any chance you could run those dyno files with a e303 cam? If not, happen to still have those dyno files? It would be real helpful for re-creating exact comparisons.

My Bronco is setup with a NP435 trans, Atlas 3.8:1, 4.11 gears and 37" boggers. I spend most of my time in high range 1st and 2nd gear, usually mid to upper RPM range - I'm thinking the e303 may help me in that area, but looking at the factory 96' cam I'm curious which will work better. All that torque sure is appealing...
I don't look at this thread very often. I do have the files. Pm'ed you.
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post #60 of 118 (permalink) Old 10-16-2012, 06:33 PM
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http://www.jegs.com/i/Edelbrock/350/2281/10002/-1 I Ordered this cam today for my future 408w build. Edelbrock #2281 Rolling Thunder series Roller cam.In. 235 Ex. 238 at .050 ,Advertised In. 299 Ex. 302,In. Lift .573 Ex. Lift .583,112 Lobe seperation . Seen the HorsepowerTV build of a 408w with 10:1 comp. Alm. heads,and roller rockers,And a performer rpm intake.I was sold! 468HP and 502 Ft. Lbs. of torque.http://www.powerblocktv.com/player/s..._num=HP2012-11
That cam makes power from 1500-6500 and would not be suited to the majority of trail rigs. I does not have enough lobe separation and too much lift for a stock EFI set-up to run properly. It would probably be fun in a go-fast rig with higher stall torque converter and an EFI tune or carburated rig. The higher stall converter is recommended by Edlebrock.
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