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Thread: Building 250-270bhp duratec

  1. #1
    Spanner Monkey

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    Building 250-270bhp duratec

    After a few tips from guys that have these engines.

    Nessecary things like pistons, rods, head work, throttle bodies, exhaust

    are arp main studs instead of the factory bolts required?
    Also are standard bearing shells ok or do you upgrade to heavier duty ones?

    anyone running without a dry sump? I’ve heard about the standard oil pump not been up to the job

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    Racer Decade Plus User rallyrob's Avatar

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    Re: Building 250-270bhp duratec

    Quote Originally Posted by doughman View Post
    After a few tips from guys that have these engines.

    Nessecary things like pistons, rods, head work, throttle bodies, exhaust

    are arp main studs instead of the factory bolts required?
    Also are standard bearing shells ok or do you upgrade to heavier duty ones?

    anyone running without a dry sump? I’ve heard about the standard oil pump not been up to the job
    After having done all the above done why would you not put arp bolts in it? If a standard bolt let go and wrecked the engine you would kick yourself for the sake of another couple of hundred quid in bolts...

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    World Champion Decade Plus User alladdin's Avatar

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    Building 250-270bhp duratec

    Quote Originally Posted by rallyrob View Post
    After having done all the above done why would you not put arp bolts in it? If a standard bolt let go and wrecked the engine you would kick yourself for the sake of another couple of hundred quid in bolts...
    I think the answer to YOUR question would be
    If they are not necessary
    Hence the original question 🤔


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    Racer Decade Plus User rallyrob's Avatar

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    Re: Building 250-270bhp duratec

    Quote Originally Posted by alladdin View Post
    I think the answer to YOUR question would be
    If they are not necessary
    Hence the original question 樂
    Apologies, Maybe I misunderstood the original question then.
    I felt it related to, does it really need them?
    Last edited by rallyrob; 23-12-2018 at 12:58.

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    Racer Decade Plus User wildo105e's Avatar

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    Re: Building 250-270bhp duratec

    Quote Originally Posted by doughman View Post
    are arp main studs instead of the factory bolts required?
    I have read many engine builders don't use arp main bolts as they are just too strong and can distort the block ?? They will also re use them a couple of times.

    but how true that is ? just trying to find where i read it.
    Last edited by wildo105e; 23-12-2018 at 13:18.

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    Racer Decade Plus User wildo105e's Avatar

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    Re: Building 250-270bhp duratec


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    Racer Decade Plus User rallyrob's Avatar

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    Re: Building 250-270bhp duratec

    Apologies for my bum steer on this then.

    As we all know assumption is the Mother of all Fuck ups and I assumed, wrongly it seems....... And for possibly misunderstanding the Question in the 1st place too.
    Last edited by rallyrob; 23-12-2018 at 19:36.

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    Racer Decade Plus User wildo105e's Avatar

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    Building 250-270bhp duratec

    My jury is still out on it. How many people have also used them ? To no detriment apart from some extra cash spent.

    👍


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    Re: Building 250-270bhp duratec

    I've used the arp stud kits in my engines with no problems but you have to fit these very carefully especially the bottom end studs as these can cause distortion to the bearing cradle. Install the studs to the correct torque without the crank installed and measure the cradle to check for any distortion, SDB have a guide on there website on the torque procedure.

    All threads need to be cleaned stud height checked finger tight with no tightness, bottom end studs will need turning down by a few tho if using a dry sump system. New std main bottom end bolts will take 300bhp or more if fitted correctly, so are the arp needed not really the essential arps are Flywheel and conrod bolts.
    Last edited by eric; 27-12-2018 at 11:01.

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    Spanner Monkey

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    Re: Building 250-270bhp duratec

    Quote Originally Posted by wildo105e View Post
    My jury is still out on it. How many people have also used them ? To no detriment apart from some extra cash spent.

    ��


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    Im guessing they’re not really required then. I can see the safety in doing them but I haven’t heard of a main bolt breaking on a duratec yet?

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    Spanner Monkey

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    Re: Building 250-270bhp duratec

    Quote Originally Posted by eric View Post
    I've used the arp stud kits in my engines with no problems but you have to fit these very carefully especially the bottom end studs as these can cause distortion to the bearing cradle. Install the studs to the correct torque without the crank installed and measure the cradle to check for any distortion, SDB have a guide on there website on the torque procedure.

    All threads need to be cleaned stud height checked finger tight with no tightness, bottom end studs will need turning down by a few tho if using a dry sump system. New std main bottom end bolts will take 300bhp or more if fitted correctly, so are the arp needed not really the essential arps are Flywheel and conrod bolts.
    Glad I got your input on this, Eric. Your build is the one that inspired me to build another engine for my car and the goal is 270bhp like yours. I know you did a lot of the engine work yourself and that’s what I plan on doing. So any hints and tips would be great!

  12. #12

    Re: Building 250-270bhp duratec

    Quote Originally Posted by doughman View Post
    Glad I got your input on this, Eric. Your build is the one that inspired me to build another engine for my car and the goal is 270bhp like yours. I know you did a lot of the engine work yourself and that’s what I plan on doing. So any hints and tips would be great!
    Do you have a copy of the Caterham CSR260 Build Manual?

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    Spanner Monkey

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    Re: Building 250-270bhp duratec

    Quote Originally Posted by eric View Post
    Do you have a copy of the Caterham CSR260 Build Manual?
    No I haven’t. Have you got a link?

  14. #14
    Last edited by eric; 30-12-2018 at 20:21.

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    Re: Building 250-270bhp duratec

    Not that i'm making judgements, but nice to see the confidentiality and copyright is being respected LOL!

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    Re: Building 250-270bhp duratec

    Great, thanks for that, looks very useful

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    Racer Decade Plus User wildo105e's Avatar

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    Re: Building 250-270bhp duratec

    i have a paper copy of the ford manual i will see if i can get it into pdf and upload.

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    Re: Building 250-270bhp duratec

    Wildo that would be great if you could upload the ford manual too.
    Keep her lit

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    Racer Decade Plus User wildo105e's Avatar

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    Re: Building 250-270bhp duratec

    Ok scanned the assembly and disassembly files they are ok certainly enough to make sense of the pics have faded a little but enough to be of use.

    Not sure how to upload them though.

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    Re: Building 250-270bhp duratec

    Wildo would sending it via e-mail be easier? I’m not the best with computers
    Keep her lit

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    Re: Building 250-270bhp duratec

    I’m also interested in following this thread as I’m
    Also in the process of sourcing parts for a duratec install. I would be very keen to get a copy of the ford manual as discussed above, if that’s ok
    Very much appreciated

  23. #22
    Racer Decade Plus User wildo105e's Avatar

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    Re: Building 250-270bhp duratec

    PM me your e-mail or post which ever you are comfortable with and i will send then out.

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    Re: Building 250-270bhp duratec

    Typically you can put ARP main studs in an torque them to the same clamping load as the stock bolts torque spec and be fine. But if you want to actually get something useful from they you'll want to go to the recommended torque and then line bore the block to get the main bearing holes round again. But honestly I'm not sure who's going to use them, people run straight from the junkyard 2.5 motors to 450hp.

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