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Building N/A Cosworth Questions

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The Outsider
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2008/11/10 18:13:43 (permalink)
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Building N/A Cosworth Questions

ok this will probably get more attention here than berried in the other thread
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Originally posted by The Outsider



my intention is of building an N/A cossie with twin 45's but may possibly change my mind and go turbo efi. getting some parts together atm as i can afford such luxuries.

so far i have the head and arp bolts. about to source the head gasket from phil

i have looked around on the uk forums for details of such a build so have a reasonable idea of what's involved.

my questions are, lighter rods would be better because they would rev quicker. is that correct? would they be strong enough?

im not looking for ultimate N/A power but nice useable and reliable power that can wake up when it needs to

im looking at the resident engine gurus like phil and mk1 lotus but anyone else with relevant experience feel free to add your 2c worth

#1


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    Vanman
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    RE: Building N/A Cosworth Questions 2008/11/10 22:14:28 (permalink)
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    I believe the guy your looking for may be DannyM on this forum. He runs a very sorted natcho YB. He often posts his ph:No. so try a search.
    #2
    maxrs
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    RE: Building N/A Cosworth Questions 2008/11/10 23:09:12 (permalink)
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    Mark's Blue Rs2o0o ran a N/A Cossie for a while, with great results.

    http://classic-ford.org/forum/pop_profile.asp?mode=display&id=312
    #3

    Cossie55
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    RE: Building N/A Cosworth Questions 2008/10/17 13:27:07 (permalink)
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    Ok, to do it so that it isnt too expensive, just do this.

    You need to get some custom made pistons, you can get these off the shelf in the UK, or custom made here for around $1200

    Use the standard turbo rods

    Take our the cams and see if you can get them ground down to a reasonable profile (probably not) to get some new billet cams machined to a good road profile (L1 and F1 is a good start). Dont weld up cams on a YB as I found from experience, along with some others that it ends up destroying the YB buckets.

    Put some webbers on it if you like (I have a manifold for YB to webber that would suit), might be worth injecting but it is probably double the cost to do EFI over webbers.

    Get some extractors made (I have a spare set of pipes, I think, to suit a n/a YB into a Mk1).

    You can use an escort 4 speed and bellhousing if you like. You need to use the YB flywheel, so the clutch will have to be a YB cluth (I think, mine is not standard)

    Thats Ill I can think of...

    jamie.augustine@motec.com.au
    #4
    Mark
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    RE: Building N/A Cosworth Questions 2008/10/17 20:13:28 (permalink)
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    Use pinto sized flywheel and an uprated clutch if you wish. You can buy any combination from the UK.

    I had a N/A Cossie on twin 45mm webers and it sounded so awesome, went okay with BD14 Cams, 11:1 compression, long con rods/short pistons. No other performance mods as such. 163hp atw, plenty more power can be had...

    Now with turbo it goes like a cut cat on LSD.
    #5
    tb303
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    RE: Building N/A Cosworth Questions 2008/10/17 21:37:13 (permalink)
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    Sorry,but i had to make a comment on Marks little saying "it goes like a cut cat on LSD" that is so funny
    #6

    The Outsider
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    RE: Building N/A Cosworth Questions 2008/10/17 22:40:08 (permalink)
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    thanx for the replies, after having a chat to phil the other day he has just about convinced me to go turbo
    #7
    fahley
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    RE: Building N/A Cosworth Questions 2010/09/29 23:12:09 (permalink)
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    Mark,

    Those cams come up as a turbo grind in the catalogues. I notice that they are low lift. Did you need to replace the vavle springs to prevent binding ?

    Ian
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    Luke
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    RE: Building N/A Cosworth Questions 2010/09/30 01:00:22 (permalink)
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    Hi Ian they are turbo cams, I may be changing plans so please keep me posted on what your doing.
    #9
    fahley
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    RE: Building N/A Cosworth Questions 2010/09/30 11:03:51 (permalink)
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    No worries. I have built the engine to find the piston valve clearance is 0.7mm. The concensus is that 1.5mm is the desired clearance. I sent the pistons back to the machine shop to have the valve pockets deepened and there isnt enough meat it you take them all the way to to the circumference and will leave t little meat around the ring support. I have to reassemble now and check the exact positioning of the valve and hope i can spot machine the clearance.

    I thought lower lift cams and changing the CR might be an option. Just wanted to check that BD14 was correct.

    what's going on with your build ? Why the change ?
    #10
    Mark
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    RE: Building N/A Cosworth Questions 2010/09/30 15:03:52 (permalink)
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    quote:
    Originally posted by fahley

    Mark,

    Those cams come up as a turbo grind in the catalogues. I notice that they are low lift. Did you need to replace the vavle springs to prevent binding ?

    Ian

    I understood mine were brand new cams. Yes I used new double springs...The engine was built to meet the requirement of the most necessary changes without going nuts. So we did pistons, rods, cams (mild), new springs, oversize valves and that is about it. Next was to have extensive porting, but decided against it...Really after 2x N/A cossie builds my summary is as follows.

    1. N/A sounds superb, really! It is old school and all that...Grins...
    2. Turbo is berserk and I cannot be happier with the outcome from a stocker engine / decent accessories...
    3. From what I see the guys who run serious N/A engines have done for a good/personal reason to either see what can be achieved as a challenge or for a particular category to race...If you want a nuts road/track car just peg a turbo engine in....If you want to spend money and develop a N/A engine then do so, but nothing is for free (well to most)

    Good Luck...

    #11
    Luke
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    RE: Building N/A Cosworth Questions 2010/09/30 17:00:52 (permalink)
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    After a meeting the other night Its been suggested I start in the under 2 litre class, depending on costs I may be going n/a. It is where I would prefer to be aswell so will see what happens.
    #12
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