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Author Topic:   Ford help or imput please
Steve Dupree
Dirt Freak

Total posts: 316
posted December 08, 2004 07:24 PM  
Hey ford guys i need a little help. I,ll keep this short but would love some imput. We ran a cam last year 517 lift and 280 duration. With 106 lobe centers. We now have a 555 565 lift 104 lobe center on intake and 116 on exhaust. Ok the car runs as good as it did last year with everything leagal now............lol We have DOOE ported with 1.9 and 1.6 valves. We have a 500 cfm motorcraft carb. and we have to use that or a 350 holley. The car is running great and has more bottom end than last year when we built it up to play with a few chev. But the car still doesnt want to go past say 5700 rpm just like last year. We run great fuel as far as octane we have to run a stock intake and we have a unilite dist. We are thinking and ordered a msd dist with coil on top do you think that might be the problem. The springs have a 130 seat preasure and a 340 open preasure just like the cam ask for. I know this is not just the intake not wanting anymore or atleast hope so. Jetting is great and timing we have set at 30 to 34 advanced. Please guys help me out this motor would be a beast if it wouldnt just stop like it does. No miss and pulls great and just then flattens out no more We cant run a hot box we cant change intake Iam begining to think it is dist. Well thanks please give me a few ideas to look at. Steve Dupree We run a 3/8 to a 1/4 mile track and we run 6.50 final gear with a 351 windsor .010 over headers cant mess with intake either just heads. Cant use roller rockers ............ HELP PLEASE

akadirtracer7
Dirt Freak

Total posts: 217
posted December 08, 2004 08:55 PM  
how old are the springs? weak springs can limit rpm .Is it falling on its face or just gets to 5700 and stays there.

ford5
Dirt Forum Champ
Total posts: 711
posted December 09, 2004 05:45 AM  
Very typical problem.....It is no doubt all your heads and intake can muster. You need to take a different approach when it comes to racing Fords.
Don't gear them like a SBC! Especially the Windsor engines, these are more lower rpm torque type engines take a bunch a gear out of it, rely on the bottom end torque, put your other cam back in, you need it for a heavy car. I would suggest 5.83-6.00 for starting gear. What's the rollout of your tires? Do you have straight thru gearing?
ford5

outlawstock17
Dirt Forum Champ
Total posts: 1363
posted December 09, 2004 06:07 AM  
ford5 is correct.....as usual, lol.

i've found that it isn't necessarily the heads. i've turned that exact casting 7200 rpm's, but it was with a victor jr. intake and a 750 holley. it's the intake manifold and carburetor that's killing you. i've never ran a 2 bbl., but a stock early model cast iron 4 bbl. intake will not flow enough to go over 6500 when the engine is loaded. 5700 sounds about right with a 2 bbl.

unless you can get the car handling well enough to get through the corners fast enough to cover what you're giving up on the straights, a gear change will be necessary.

another thing.....those heads need a little more timing than you're running. try about 38. you might get closer to 6000 with a little more timing.

[This message has been edited by outlawstock17 (edited December 09, 2004).]

Steve Dupree
Dirt Freak

Total posts: 316
posted December 09, 2004 06:23 AM  
Hey thanks guys i kinda figured that because i have the same motor in my 70 mach1 and have no problem turning the rpms but it has a torqer intake with a 750 holley. The car is a fast as any car on the track through the coners ifnot faster but some of the hot chevys catch me at the end of a staight away. We run anyware from a 88 inchrole out to a 85 so we can play with tires for gearing. We ran a set of 6.20 last year for awhile and when we changed gear we did improve are time but we were doing so many changes to the car at that time not really sure if we would do better back with the 6.20 but just sold them on Ebay lastnite lol. As far as adding more timing we are at are limit really and please correct me if iam wrong but if i went back in timing i should get a little more top end just a little less lower response iam i correct on this. I know they sell a timing retarder for msd ignitions that retard the timing as you incerase rpms. Well thanks guys Guess i might have to order me another set of gears and play a little, lol Steve Dupree

ford5
Dirt Forum Champ
Total posts: 711
posted December 09, 2004 08:17 PM  
outlawstock17 is right as well...you can and should run at least 38 total degrees of timing. it will help all around

john demartino
Dirt Roller

Total posts: 8
posted December 10, 2004 07:32 AM  
Steve just get a chev Monte Carlo with a 360 chev engine and you will be in the hunt LOL John

    

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