200ci vs 250ci
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Cranky Old Guy
Joined: Mar 2008
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From: Raphine, Virginia
200ci vs 250ci
Continuing in my engine plans for my 66 half cab Bronco, I bought a 250ci w/ a serpentine belt setup w/ PS for $70. Susposed to be running, but I haven't picked it up yet. Would you build the 250 or the 200 that I have? Still have to measure and see if I can stuff it in the Bronco with it being 2" taller without cutting hood. Opinions?
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From: Spokane, WA
http://fordsix.com/forum/viewforum.php?f=1
http://www.classicinlines.com/tech.asp
Those folks know more about the small block 6 than one can throw a wrench at.
Either engine can be built to scream but with the 250one is starting out with some "free" hp/tq over the 200.
http://www.classicinlines.com/tech.asp
Those folks know more about the small block 6 than one can throw a wrench at.
Either engine can be built to scream but with the 250one is starting out with some "free" hp/tq over the 200.
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Cranky Old Guy
Joined: Mar 2008
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From: Raphine, Virginia
I believe it does. I ordered the Falcon Performance handbook, and joined Fordsix. Since I'm working with a bare frame, exploring the option of backing it up with a 4 speed toploader and I can get an adapter to mate to my Dana 20 TC. A lot depends on how easy I can find the parts. While this is a 4x4 it will be an old mans street version.
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Cranky Old Guy
Joined: Mar 2008
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From: Raphine, Virginia
Actually the one I was thinking about is the 4 speed overdrive. It has 3.29 first, 1.84 second, 1.00 third and .081 4th. I found one, but a little pricey. Still doing my research and checking on feasibility. I have to get that other engine and decide which to use. If it's trashed, I'll build the 200.
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I have the iron-cased, side shifted 4 speed OD behind a 300. Major gap 2nd to 3rd. Depending on gearing, this will make certain speed ranges on hilly/curvy roads impossible. For mine, with 3.50s and 31" tires, it falls between about 30 and 50. Revs too high in 2nd, won't pull 3rd.
Not sure if a Mazda 5 speed out of a V8 PU would fit for length and height. This trans gets badmouthed, but others run them a long time. Just plug up the leaks up top. Ratios include a near 4:1 first, and better spacing 2-3-4, with OD 5th.
Remember, if you go with the 200 with the sbf 6 pattern, you are pretty screwed for transmissions other than a C4. Not sure about adaptors.
Not sure if a Mazda 5 speed out of a V8 PU would fit for length and height. This trans gets badmouthed, but others run them a long time. Just plug up the leaks up top. Ratios include a near 4:1 first, and better spacing 2-3-4, with OD 5th.
Remember, if you go with the 200 with the sbf 6 pattern, you are pretty screwed for transmissions other than a C4. Not sure about adaptors.
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Cranky Old Guy
Joined: Mar 2008
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From: Raphine, Virginia
Yea, thats why my plans are kind of up in the air right now. I'll be running 4:11 gears and 235/75/15's and I don't know enough to figure out what will effect what. If I go with the 250 and sbf 8 bell housing it opens up tranny options. What I need is a program to punch in the cam spec's, tranny gearing, rear end and tire size. I can find dyno results for a few builds, but no torque curve and no gearing. I guess I'll have to call Classic Inlines or Cliffords and ask for advice on diff. combinations. The only time this one will see 4 wheel drive is when it snow's. Thanks for the info on yours, that does help, now to figure out what diff the 4:11's would make.
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235-75x15s are 29 inch. With a .81 OD, you are at 2507 rpm at 65. Probably ok. Put in you gearing/tire numbers here to check more combos:
http://www.novak-adapt.com/knowledge/gearing.htm
As for power curves, if you have a build that shows torque at x rpm and hp at y rpm, you can figure the hp from the torque and torque from the hp. And know that they are equal at 5252 rpm:
http://www.ajdesigner.com/phphorsepo...ing_torque.php
You can see if it's a linear curve, and halfway project the curve.
My wag would be a warm 250 would hit peak torque about 3000, and hp about 5000, depending on what you do about the primitive manifolding. Thus, running it at 2500 rpm for cruise would probably work ok. ymmv.
http://www.novak-adapt.com/knowledge/gearing.htm
As for power curves, if you have a build that shows torque at x rpm and hp at y rpm, you can figure the hp from the torque and torque from the hp. And know that they are equal at 5252 rpm:
http://www.ajdesigner.com/phphorsepo...ing_torque.php
You can see if it's a linear curve, and halfway project the curve.
My wag would be a warm 250 would hit peak torque about 3000, and hp about 5000, depending on what you do about the primitive manifolding. Thus, running it at 2500 rpm for cruise would probably work ok. ymmv.
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Cranky Old Guy
Joined: Mar 2008
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From: Raphine, Virginia
Well, scratch the 250. Picked it up today (3 hr drive) glad I only paid $70. It's a C5PF engine which near as I can tell is a 240 big block. Not a part on it I can use. Does have the sepentine belt setup w/ power steering and bell housing. I was so pissed I just loaded it and came home. I guess I'll try to sell parts off it and scrap it. At least my decision was made for me so I'll build my 200.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Well, scratch the 250. Picked it up today (3 hr drive) glad I only paid $70. It's a C5PF engine which near as I can tell is a 240 big block. Not a part on it I can use. Does have the sepentine belt setup w/ power steering and bell housing. I was so pissed I just loaded it and came home. I guess I'll try to sell parts off it and scrap it. At least my decision was made for me so I'll build my 200.
The 250 was introduced in 1969, used in passenger cars only thru 1980 (Granada).
As you know, the 250 looks very similar to a 200. The 240 is much larger, looks nothing like either one.
However...it could be a 300 I-6 as the two engines share the same block casting number.
Peeps are looking for 300's. If the stroke turns out to be 3.98" that's what you have.
The 240's stroke is 3.18"
btw: No 250 engine on the planet ever came with a serpentine belt setup from the factory. That's someone's conversion.
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Cranky Old Guy
Joined: Mar 2008
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From: Raphine, Virginia
The Ford tag reads C5PF-6005-A, options SO-54900, serial 37695-R8KR. Clearly marked with Ford Industrial stickers. I looked at the block casting number, but haven't written it down. It's def. a big block, a good bit longer than my 200. Came out of a combine I was told. "runs" but I never believe that till I hear it. Would make a good engine for another project, but I have no use for it in my little 66 half cab. The belt setup doesn't look stock, but everything is there, all pulleys and belt.