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Thread: Bedford cf v8

  1. #1
    Rods 'n' Sods Junkie
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    Bedford cf v8



    Just bought this van running a 3.9 fuel injected rover v8 on auto box,with standard CF rear axle,feels like the gearing is to tall as doesn't pull very well ok once it gets rolling .
    Any advise on whether to change rear axle to jag irs and what ratio.

    steve

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    Rods 'n' Sods Junkie fingers's Avatar
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    Re: Bedford cf v8

    Hi, nice van.

    I am fitting a Rover 3.5 into my CF camper and will be fitting a Chevy axle with a ratio of somewhere between 3.08:1 and 3.5:1 depending on what I can get hold of when I'm ready for it. The CF axle ratio's ranged from between 4.454:1 to 5.211:1 depending on what engine it originally had.

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    Re: Bedford cf v8

    Hi
    Thanks for the info,seems gearing is a bit high.

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    Rods 'n' Sods Junkie fingers's Avatar
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    Re: Bedford cf v8

    Anytime.

    Could I be cheeky and ask you to post some photo's of your engine mounts please. It would be handy to see a working vehicle to copy .

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    Re: Bedford cf v8

    I will sort some out for you

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    Rods 'n' Sods Junkie fingers's Avatar
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    Re: Bedford cf v8

    Nice one, cheers.

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    Rods 'n' Sods Junkie fluff's Avatar
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    Re: Bedford cf v8

    hi there,
    i have owned several cf vans and found that the standard van axle is low geared . running a 2.3 motor on a manual box i was lucky to get 90 out of it so when i fitted a rover v8 to it it was awsome to 90 but drank fuel like i drink beer so i fitted a jag irs with a lsd 3.03:1 ratio and got over 25 to the gallon on a run plus acceleration was ok
    then fitted a 318 mopar and went daft

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    Re: Bedford cf v8

    The problem I have is pulling away it is very sluggish,thinking about putting a 2.88:1 jag irs in it.

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    Official RnS Addict UK RUSS 1960 OLDS's Avatar
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    Re: Bedford cf v8

    Quote Originally Posted by SteveW View Post
    Hi
    Thanks for the info,seems gearing is a bit high.
    Hi SteveW,

    It seems there is a bit of confusion with the gearing, the higher the number the lower the gearing ie 5.00:1 is lower geared than 4.00:1. Lower gearing will give you better acceleration but a lower top speed.

    If you have got the original CF axle on the van at the moment and "fingers" is right about the standard CF axle ratios then changing over to a Jag back axle is only going to make your acceleration slower and your top speed higher.

    Another thing to take into account is your wheels and tyres, if your rolling radius is less than the original wheels and tyres you will effectively be lowering the ratio and with a larger wheels/tyres you will be making the ratio higher.

    There are some charts about on the internet (they have been posted on RnS before) which calculate axle ratios and speeds for given RPM etc, i will have a look for them a bit later and post them up when i find them.

    Cheers.

    Russ.

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    Boogie vanner Evil McNasty's Avatar
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    Re: Bedford cf v8

    Back in the day the thing to do was fit a cresta diff in the CF axle, you will probably find this is what you have. A Transit axle is a bit narrower but you can get a better range of diffs and get wider wheels under the arches if you want...... Dave.
    "…si quid habet mammas vel rotas, res habebis difficiles aliquando,"
    "Carpe diem" -Quintus Horatius Flaccus (65 BC – 8 BC).

    What Would the Dude Do?

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