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250 xflow problems 

 

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 Post subject: 250 xflow problems
Posted: Mon Oct 26, 2009 6:10 pm 
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Joined: 26th Oct 2009

Ride: cortina

Location: Young
NSW, Australia

hi i have a cortina with a 250crossflow that i race speedway in. it has yella terra speedway cam kit rockers etc. we are limited to running 350 holley with standard manifold,we have done alot of work machining out the manifold and run electronic distributor race leads and cold xf plugs because the car has a great cooling system never gets over 70 degrees really. the problem is at mid to hi revs the engine starts to make a weird flutter-missing kind of noise and loses probably half its power. we have spent hours trying to solve it. any suggestions would be greatly appreciated. cheers.
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 Post subject: Re: 250 xflow problems
Posted: Mon Oct 26, 2009 9:40 pm 
Getting Side Ways
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Age: 49

Posts: 1634

Joined: 8th Jul 2007

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Ride: EL F100 CAPRI XR EF

Power: 234 rwkw

Location: brighton
SA, Australia

hi, welcome to fordmods...

what fuel pump are u running? also what size fuel line, bigger tank pickup? and what size needle and seat in the 350?
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 Post subject: Re: 250 xflow problems
Posted: Tue Oct 27, 2009 7:45 pm 
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Ride: cortina

Location: Young
NSW, Australia

hey mate we run electric holley and manual pump 5/16 fuel line and pick up and 110 needle and seat. it revs out really well when its not under load but when the car is under load is when the problem starts
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 Post subject: Re: 250 xflow problems
Posted: Wed Oct 28, 2009 9:47 am 
Getting Side Ways
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Ride: 93 ED sedan

Power: 161 rwkw

Location: Rockhampton
QLD, Australia

You'll need 3/8" fuel line, from the tank ( pick up ) to the carby.....what size jets????...64's would be ok, maybe up to 66's,..... what power valve????....try a 95.
Is the dizzy regraphed???.........what comp ratio are you running????....10:1 or better, use MSD ignition or ICE ignition.

 

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 Post subject: Re: 250 xflow problems
Posted: Wed Oct 28, 2009 10:48 am 
Getting Side Ways
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Location: Melbourne
VIC, Australia

Have you tried warmer plugs?
A 'cold' plug transfers more heat away from the tip.
Plug heat rating is not about coolant temperature, its about combustion and plug tip temp.
Its a balancing act between not too hot to burn out the tip, and not too cold that the plug fouls up easily.

70deg sounds pretty cold, could be an issue there too.

 

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