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Old 09-18-2005, 22:21   #1 (permalink)
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XD 250 rod, crank and piston conversion for turbo build..?

Hey guys, just wondering if anyone has heard of or has experiance with using an EL-EF crank with 3.9L or 4.0L rods and pistons fom an EA-EB falc in a 250 crossflow..?

I have heard that the EF crank and EB pistons and rods are stronger than the stock 250 parts, but what mods are required to use them to make a stronger 250 donk....

Also I think ive heard of this combination being used in turbo applications for the extra strength..? Any truth to this..?

Any advice would be great

Cheers...
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Old 09-20-2005, 01:13   #2 (permalink)
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Re: XD 250 rod, crank and piston conversion for turbo build..?

I am told an EF crank will fit the LAST of the XF blocks (87DA----). Have a look around fordsix.com (the aussie 6 section).
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Old 09-20-2005, 02:56   #3 (permalink)
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Re: XD 250 rod, crank and piston conversion for turbo build..?

ive heard of the swap going the otherway, using the 200 crank in a 4l, making a shorter stroke for more rpm.... so im only guessing it does fit backwards
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Old 09-23-2005, 20:30   #4 (permalink)
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Re: XD 250 rod, crank and piston conversion for turbo build..?

guess nobody really knows - I'VE heard you need an EL crank because it has different counterweights to the EF (and before that EA-D they were the same as a 250), and you use the 3.2 / 3.3 rods so it'll rev like a muther. I'm not even sure if they have a different stroke??
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Old 10-09-2005, 03:30   #5 (permalink)
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Re: XD 250 rod, crank and piston conversion for turbo build..?

Quote:
Originally Posted by hot_XD_falcon
Hey guys, just wondering if anyone has heard of or has experiance with using an EL-EF crank with 3.9L or 4.0L rods and pistons fom an EA-EB falc in a 250 crossflow..?

I have heard that the EF crank and EB pistons and rods are stronger than the stock 250 parts, but what mods are required to use them to make a stronger 250 donk....

Also I think ive heard of this combination being used in turbo applications for the extra strength..? Any truth to this..?

Any advice would be great

Cheers...
You will need an 84DA block or later from a late XE or XF due to the type of rear main seal used.

Use an EF crank as they have 12 counterweights, compared to the 9 weighted cranks from the late x-flows.

Get a set of 200ci rods from a 3.3 XE, these are longer than the 4.1 rods

A set of pistons to suit the longer rods, you can order ACL brand through Repco or Bursons.

Just make sure you get it all balanced properly and you shouldn't have a problem with revving to 6500 reliably.

As for strength, I have personally seen this simple combination used for 250 rwkw and 7000 rpm so for your streeter it should be up to the task I'd say.
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