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Old 01-14-2008, 14:56   #1 (permalink)
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EFI to CARBY CAM ?

Can anyone who has converted a 302 from EFI to Carby tell me what cam they used and wether it worked well.

Is the stock EFI roller cam all wrong for a carby ?

(the motor is from a 92 Fairlane)

I'm getting conflicting advice.......

Thanks
Marshall
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Old 01-14-2008, 15:15   #2 (permalink)
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Re: EFI to CARBY CAM ?

hi,the stock roller cam will work fine with a carby. the 92 fairlane engine is just a 5.0 HO usa engine and the cam has a bit more lift and duration than tha stock usa 5.0L efi engine and is much better than the old 302w carby stock cam. any of the cams that are listed fore the your efi engine will work perfectly fine with a carby. if you do start doing cam swaps, just check the firing order is correct. early carb windsors and the efi 5.0L engine use the 1 5 4 2 6 3 7 8 firing order and the efi 5.0 HO(same as all aussie falcon/fairlane fitted 5.0's) use 1 3 7 2 6 5 4 8 same as 351w and clevo. if any other q's just ask.
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Old 01-14-2008, 20:11   #3 (permalink)
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Re: EFI to CARBY CAM ?

Thanks for responding Craig, I am aware the EFI's have 351 firing order and I would appreciate you view on :-

What is the power rev range of the stock roller cam? (i understand there is approx 3000 rpm band) (dont know if this alters between EFI and carby)

If it is relevant the vehicle is 66 Mustang, 5 speed mannual, no air or PS, standard diff ratio.

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Old 01-15-2008, 08:38   #4 (permalink)
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Re: EFI to CARBY CAM ?

Quote:
Originally Posted by marshall
Can anyone who has converted a 302 from EFI to Carby tell me what cam they used and wether it worked well.

Is the stock EFI roller cam all wrong for a carby ?

(the motor is from a 92 Fairlane)

I'm getting conflicting advice.......

Thanks
Marshall
Why ? detuning to a carb costs lots of power.
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Old 01-15-2008, 20:36   #5 (permalink)
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Re: EFI to CARBY CAM ?

the stock cam is only good to around 3500rpm. if you use a good single plane or the edelbrock rpm air gap dual plane intake you will make more mid and topend power than the stock efi setup. it will rev higher than 3500 of course wether its efi or carb but they just dont make great power with the ultra conservative stock cam.
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Old 01-30-2008, 14:57   #6 (permalink)
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Re: EFI to CARBY CAM ?

True every test i have read shows a carbie setup outpowers a efi setup on a 5.0 although most tests ive seen start from 2500rpm up, the hp and torque has always been higher, these motors love a victor jnr or as craig said a edelbrock rpm air gap, no bigger than a 650 cfm carb.
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Old 01-31-2008, 16:15   #7 (permalink)
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Re: EFI to CARBY CAM ?

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Originally Posted by aussiemart View Post
True every test i have read shows a carbie setup outpowers a efi setup on a 5.0 although most tests ive seen start from 2500rpm up, the hp and torque has always been higher, these motors love a victor jnr or as craig said a edelbrock rpm air gap, no bigger than a 650 cfm carb.
Experience tells me an aftermarket manifold like an airagp fitted with the injection makes more torque and better midrange than a carby with better emissions.. as I said a carb costs over all power and a probe will prove it kills the emissions .
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Old 01-31-2008, 18:53   #8 (permalink)
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Re: EFI to CARBY CAM ?

yes atec77, i like the idea of EFI on an air gap or single plane manifold. that would definetly give the benefit of good airflow and better engine control. just more expensive too!!
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Old 01-31-2008, 20:16   #9 (permalink)
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Re: EFI to CARBY CAM ?

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Originally Posted by cjperformance View Post
yes atec77, i like the idea of EFI on an air gap or single plane manifold. that would definetly give the benefit of good airflow and better engine control. just more expensive too!!
The factory manifold is a fudge in some respects , I ran an air gap on a 400 inch clevo with injection and the mid range was wonderful ( fitted to a coupe).
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Old 01-31-2008, 21:15   #10 (permalink)
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Re: EFI to CARBY CAM ?

geez atec, you're being a bit too fair on the stock manifold! ha ha , its a fudge in most respects! not a really well thought out piece of engineering, the lower half is reasonable though.
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