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Thread: R5 News

  1. #4801
    Armchair General Mirek's Avatar
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    I think that they still have relative disadvantage in used stock base engine even though it went through a lot of changes since the time DS3 was developed. I mean that they are still the only ones using stock 1.6 engine as a basis and therefore near stock bore/stroke ratio which is a lot different than in other cars (they have smaller bore and larger stroke).
    Stupid is as stupid does. Forrest Gump

  2. Likes: RS (26th November 2017)
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  5. #4803
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    Quote Originally Posted by Mirek View Post
    I think that they still have relative disadvantage in used stock base engine even though it went through a lot of changes since the time DS3 was developed. I mean that they are still the only ones using stock 1.6 engine as a basis and therefore near stock bore/stroke ratio which is a lot different than in other cars (they have smaller bore and larger stroke).
    Yeah, engine still doesn’t look that strong from videos so far although power delivery looks less weird than on the old car.

  6. #4804
    M-Sport WRC Champions '17 Fast Eddie WRC's Avatar
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    Quote Originally Posted by RS View Post
    The put-put-put under braking on the Citroen sounds a bit silly, but overall it looks more convincing than the previous generation PSA R5s.
    Sounds awful... especially compared to the old DS3 R5 which sounded fabulous.

    Looks good though.
    The Incurable Enthusiast

  7. #4805
    Senior Member Sulland's Avatar
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    Does this make sense: http://www.carmag.co.za/technical_po...s-shortstroke/

    So for rally the longstroke gives a bit more torque in low revs, is that the main advantage?
    in the two litre era they used to be square did they not?

    I thought the modern turbos compensated for this.
    www.Rallye-info.com

  8. #4806
    Armchair General Mirek's Avatar
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    Quote Originally Posted by Sulland View Post
    Does this make sense: http://www.carmag.co.za/technical_po...s-shortstroke/

    So for rally the longstroke gives a bit more torque in low revs, is that the main advantage?
    in the two litre era they used to be square did they not?

    I thought the modern turbos compensated for this.
    I am not engine engineer but if I remember the main issue with such small bore engines is that the piston is so small that there is not enough space for larger valves. For sure there is a reason why purpose-built WRC engines have large bore and short stroke - Polo WRC bore/stroke ratio 1,125; Fiesta WRC 1,123; C3 WRC 1,167. Now compare with same size R5 units. Fabia R5 1,088 (based on 1.8 stock engine with shortened stroke); Fiesta R5 1,192 (based on 2.0 stock engine with shortened stroke); C3 R5 0,897 (based on stock 1.6 engine).
    Stupid is as stupid does. Forrest Gump

  9. Likes: electroliquid (26th November 2017),Sulland (26th November 2017)
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    Senior Member Andre Oliveira's Avatar
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    Senior Member Andre Oliveira's Avatar
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    Senior Member Andre Oliveira's Avatar
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    I am curious how will be a VW rally car without Ogier hands

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