ideas for 250 x flow hot up

[Anonymous]

can anyone give me any suggestions for the best way to get more hp out of a carby 250 x flow for a low end budget , i understand that these motors love a cam upgrade and exhaust system but is that enough? or should i port and polish as well...

 

[Anonymous]

What is it mate, a 2V or an X-flow?

 

[Anonymous]

yeah its a crossflow

 

[xctasy]

Port and polish, loose part throttle power and economy.

Cam in a mild sense, and get it all!

If its alloy head XF, keep the mods to a minimum as the engine is set with 37 to 40 degrees total advance and runs high swirl heads which detonate if the head is modified. The TFI ignition wasn't as cheap or nice as the earlier kind

The XE Alloy Head II is the best engine for realiability, as it has a great flowing head but has smaller valves, conservative igniton advance, and has an easily changable ignition.

The XD/TF Alloy Head is just a 1-bbl XE engine, first of the Duraspark electronic ignitons in the sixes. Very conservative advance curve. Loves all the XE bits. The head doesn't have recesses for the EFI injectors, but you can fit al, the XE EFI bits on it if you relieve the ports as per the XE gasket

The cast iron XD/TE is a cleaned up XC engine with a more aggressive spark curve, better ports, bullet proof head. No electronic igniton.

The XC/TE is a low performance engine, with no electronic ignition.


The best budget is to use the XE engine, and add a cam, a better 2-bbl Untraflow Sprint intake, and add a DGAS 38 or 2300 Holley carb. If the wollopers are going to defect it, just run the XE EFI, and add the later wilder XF or aftermarket XF Crow cam.

I'm not saying an XF is a bad engine at all. It just isn't good unless the ignition curve and high swirl head and electronics are not dealt with. Any time you have electronics and higher lift cams, you need to reduce total advance gain, while still having enough intial advance to start in a cold morning.

 

[Anonymous]

whats the difference tween the xe and xf? arent they both 250 x flows ?

in fact arn't they the same car with just different front and rear ends?

 

[xctasy]

Ford spent lots of time and money on the XF.

The crank seal (block), IN 1985 and again in 1987,
the rings (on 4.1 only),
the ignition
the EFI cam,
the head,
the valves,
the carb,
the EFI calibration and EEC based ECM,
the ventilation,
the firewall,
the electonics,
the steering column
the tilt seating on Fairmonts upwards
the emissions systems
the wider ratio gear boxes
the later option of the T5 in 4.1's
the engine/body specific exhast modifications
the elimination of P-metric tyres and wheels on Ghia and LTD's

The whole turret of the XF sedan was different in that the fold down back seat and air box behind the fire wall was different. Internally, the XF got the new head, ignition, electronics and cam profiles, special noise reducing flywheels and exhast for the wagons, sound deadening packages to stop the drones of the noisy XD/XE body, and a bunch of emissions control mods. The EFI was a very quick car in manual form, 16.4 seconds, verses 16.9 for the XE.

The XF Ute had a bunch of running changes which lasted until 1993, when the ute finally got the XG revision. Basically, the XF lasted from October 1985 to March 1993.