Douvrin Con Rods
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  1. #1
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    Default Douvrin Con Rods

    The rally car is going again, decided to go with the XN1 then do a Douvrin properly, incidentally I really noticed a difference going back to the push rod engine, very dull by comparison.

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    With the Douvrin I'm thinking of fitting light weight con rods from something else. The bearing size will no doubt be smaller which should improve lubrication, one of the failings I identified with my run of distasters, also there is the chance of increasing the stroke for more ccs. This engine is only just undersquare so it should handle this OK.
    Thoughts anyone?

    Graham

  2. #2
    1000+ Posts PeterT's Avatar
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    Just get some made locally at PPM Racing. Cheap as chips these days.

    '92 205 Mi16
    '90 Mi16x4

  3. #3
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    Quote Originally Posted by PeterT View Post
    Just get some made locally at PPM Racing. Cheap as chips these days.
    Any idea of cost Peter?
    I dropped in at Crankshaft Rebuilders just then and will take the rod and crank back when Ian returns from holidays.
    Crank needs to be measured to check how much stroke can be added.
    They were in agreement that the rods were way too heavy.
    Graham

  4. #4
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    Quote Originally Posted by GRAHAM WALLIS View Post
    Any idea of cost Peter?
    I dropped in at Crankshaft Rebuilders just then and will take the rod and crank back when Ian returns from holidays.
    Crank needs to be measured to check how much stroke can be added.
    They were in agreement that the rods were way too heavy.
    Graham
    Looks like $800 for a set of stock rods, surprising how much Peugeot stuff they have listed.
    Hopefully something else stock may be adaptable, design would have to add a lot I would have thought.
    Graham

  5. #5
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    See if these guys have something that can be used or modified, probably best bang for the buck:

    http://www.ebay.com/itm/Peugeot-306-...294805&vxp=mtr

  6. #6
    1000+ Posts PeterT's Avatar
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    Certainly very cheap and will even print your name on the side of the conrod if desired! I have no idea how these compare in quality to locally made rods from PPM or Ridgecrest.

    '92 205 Mi16
    '90 Mi16x4

  7. #7
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    Quote Originally Posted by PeterT View Post
    Certainly very cheap and will even print your name on the side of the conrod if desired! I have no idea how these compare in quality to locally made rods from PPM or Ridgecrest.
    Check with Adrian. Both Owen and I got sets from these guys some years back, they were mistakenly listed as suitable for the 504. I don't know what Owen did with his set, mine were used for a 106 kit car that is still running strong on the national hillclimb circuit.

  8. #8
    1000+ Posts PeterT's Avatar
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    Also, when you consider you're getting a set new set of ARP rod bolts, they are even better value.

    '92 205 Mi16
    '90 Mi16x4

  9. #9
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    None of this is important at the moment I need to see what is needed sizewise then have a go at finding something close. Hugely expensive to design a one off from scratch I would have thought.
    Graham

  10. #10
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    Lighter conrods will be a great advantage, they they're heavy original, which you write Graham I found these in catcams but these are just the 2 liter model,( Renault 21 Turbo) unfortunately.
    http://www.catcams.co.uk/acatalog/Renault_Conrods.html

    Why should the bearing size be smaller? I am also interested in buying light conrods to Douvrin engine.
    I know a guy that has increased the stroke to 92mm in Douvrin engine, larger bore would also be a very interesting way to go ....

    Bobby

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    Quote Originally Posted by Douvrin504 View Post
    Lighter conrods will be a great advantage, they they're heavy original, which you write Graham I found these in catcams but these are just the 2 liter model,( Renault 21 Turbo) unfortunately.
    http://www.catcams.co.uk/acatalog/Renault_Conrods.html

    Why should the bearing size be smaller? I am also interested in buying light conrods to Douvrin engine.
    I know a guy that has increased the stroke to 92mm in Douvrin engine, larger bore would also be a very interesting way to go ....

    Bobby
    They are a bit big for proper lubrication, also by offset grinding the crank you can get a capacity increase.
    I would consider going 2 litre, if these rods are readily available and the other approach was too difficult. Edit: Just checked, these are for the F series engine.
    Graham

  12. #12
    Demannu-facturing! Demannu's Avatar
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    Quote Originally Posted by GRAHAM WALLIS View Post
    Edit: Just checked, these are for the F series engine.
    Graham
    Scroll to the end, there's a set there for the R21 Turbo. Pricey though.
    Scotty

    Melbourne - Dandenong Ranges

    1956 Peugeot 403 - 'Francois' - resto project

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  13. #13
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    Quote Originally Posted by Demannu View Post
    Scroll to the end, there's a set there for the R21 Turbo. Pricey though.
    OK, saw the word Twingo (typo obviously) and didn't look further.
    Yes, a bit pricy especially given you will lose 200cc.
    Graham

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    1000+ Posts PeterT's Avatar
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    Just dig deep and get some new rods made locally. $800 is normal.

    '92 205 Mi16
    '90 Mi16x4

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    Quote Originally Posted by PeterT View Post
    Just dig deep and get some new rods made locally. $800 is normal.
    For a one off?

  16. #16
    1000+ Posts PeterT's Avatar
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    I'm afraid so, if you want a light weight, strong con-rod.

    '92 205 Mi16
    '90 Mi16x4

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    Quote Originally Posted by PeterT View Post
    I'm afraid so, if you want a light weight, strong con-rod.
    I meant cost of $800 for a special one off order?
    Surely it would cost more than their off the shelf items.
    Graham

  18. #18
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    Why don't you just warm up the XN, with high CR pistons, QTB's and MS. Bulletproof engine, known blueprint. Is MikeL using the QTB's he bought? 170 bhp without stressing the engine too much.

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    http://cgi.ebay.fr/Bielle-H-forgee-R...item3368fcea65

    Douvrin con rods , 2 liters?

    Bobby

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    Quote Originally Posted by ThanosK View Post
    Why don't you just warm up the XN, with high CR pistons, QTB's and MS. Bulletproof engine, known blueprint. Is MikeL using the QTB's he bought? 170 bhp without stressing the engine too much.
    Actually I ran it with the standard XN1 square port last sat night and didn't really think it was any slower over the ground than the Douvrin once you got it wound up a bit. Nice to get better fuel consumption too.
    Handling doesn't seem as good though, not much more weight but a bit more forward I guess.
    The suspension is really working well although I've worn out the spherical joints on the rear shocks, too much mud and grit.
    Bought some replacements with built in seals.
    Thinking a quick fix would be to fit throttle body injection onto the square port manifold, since the MS is already in place.
    The car is meant for long distance and navigational events anyway, 205 for the faster stuff.
    Graham

  21. #21
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    Quote Originally Posted by Douvrin504 View Post
    Says 2.2 as well?
    Need to contact them and ask for dimensions.
    Graham

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    Quote Originally Posted by GRAHAM WALLIS View Post
    ...Handling doesn't seem as good though, not much more weight but a bit more forward I guess...
    I think a 15 mm spacer between the top mount and the strut tower and a thicker (27 or 28mm) front ARB will improve things a lot.

    Quote Originally Posted by GRAHAM WALLIS View Post
    ...I've worn out the spherical joints on the rear shocks, too much mud and grit.Bought some replacements with built in seals...
    Thanks for the heads-up on that, I will take a look at mine as well and even replace them prophylactically with the sealed units.


    Quote Originally Posted by GRAHAM WALLIS View Post
    ...Thinking a quick fix would be to fit throttle body injection onto the square port manifold, since the MS is already in place...
    This seems like a really good idea, better throttle response, economy and power. Not to mention your history with the Douvrin . Maybe a Wade 112 and a light head skim just to hustle things along a bit.

  23. #23
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    Quote Originally Posted by ThanosK View Post
    I think a 15 mm spacer between the top mount and the strut tower and a thicker (27 or 28mm) front ARB will improve things a lot.



    Thanks for the heads-up on that, I will take a look at mine as well and even replace them prophylactically with the sealed units.




    This seems like a really good idea, better throttle response, economy and power. Not to mention your history with the Douvrin . Maybe a Wade 112 and a light head skim just to hustle things along a bit.
    I will be shifting up the spring platforms by 15 or 20mm tommorrow, it has been working very well for clearance but not quite high enough for the conditions in the Classic Outback Trial
    I'm using the GTi front bar but still have the GR rear which worked very well with the Douvrin.
    No time to get the injection idea sorted, just over three weeks to go, and probably better to keep it simple for the Outback Trial, so stick with the Solex TMIMAfor now. Yes, the 112 works really with the square port engine.
    Graham

  24. #24
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    Quote Originally Posted by Douvrin504 View Post
    Did anyone get the dimensions for these?
    1985 S2 505 GTi. Someone please sell me an S2 drivers side front 1/4 panel so I can get this on the road again.
    1985 S1 505 SRi. Parts car.
    1957 403 sedan. Aka Ruby.
    1979&81 Suzuki LJ81s.
    1980 Suzuki LJ80V.
    1981 Suzuki SJ40 Sierra.
    2000 Suzuki Jimny.

  25. #25
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    Hey Graham, you have found or bought Douvrin conrods?

    Bobby

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