Torque Cars

Polishing and porting diesel engines

Discussion in 'Diesel Chat' started by obi_waynne, 14 January 2014.

  1. obi_waynne

    obi_waynne Administrator Staff Member Moderator

    Messages:
    41,250
    From:
    Deal, Kent UK
    Car:
    A3 1.4 TFSI 150 COD
    Is there much of a power gain to be had through porting and polishing a diesel engine?
     
  2. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    Depends on how well the engine is designed in the first place.
     
  3. T9 man

    T9 man TC Pro Founder Moderator

    Messages:
    20,369
    From:
    London, UK
    Car:
    Saab 9-3SS T9
    This is interesting, I always thought that this was strictly a petrol engined modification.
     
  4. TCJBOLDIE

    TCJBOLDIE Torque King

    Messages:
    4,813
    From:
    Brisbane
    Car:
    JB Starion
    As the basics are the same I fail to see why there would not be similar benefits as HDI said it depends on how well it was designed in the first place .
     
    Last edited: 14 January 2014
  5. HDi fun

    HDi fun TC ModFather

    Messages:
    15,384
    From:
    Buckinghamshire UK
    Car:
    Passat 2.0 TDi
    I think that in the case of forced induction (as is the case cos naturally aspirated diesels are pretty much defunct) there's no need to be porting and polishing because there's always positive pressure in the intake tracts.

    And given that diesel engines have no throttles too I cant see too many benefits.
     
  6. Ronbros

    Ronbros Torque Junkie

    Messages:
    242
    From:
    USA Austin tx.
    Car:
    opel-isuzu 1.8 turb
    i agree HDI,boost can overcome some/most restrictions in the inlet tract.

    but lately some hi-output/ race diesels are getting more power from larger and straighter inlet systems along with larger ports and valves.

    those engines are extreme tho.

    but realisticly , probably not needed with most of the guys on this site!

    if i want more torque i just up the manifold pressure #s. and add fuel till it smokes then back off fuel a tad.

    also another way is add alcohol injection just when boost is high, not when cruising. dont want anything getting into the crankcase!
     
  7. Chargedc20ne

    Chargedc20ne Wrench Pro

    Messages:
    25
    From:
    South Africa, Witbank
    Car:
    opel corsa 2.0L S
    It's an interesting argument actually, take the ford 2.5 turbo diesel for example. Standard 93Kw and 329nm, after flowing the entire intake side it went up to 104Kw and 361nm. After doing all that we changed the boost pipes to 72mm, fitted a larger intercooler, upped the boost to 1.0 bar from the standard 0.8 and fitted a 63 mm exhaust. It went to 132Kw and 445 nm on the wheels. There are gains when polishing and porting any engine, the gains just differ.
     
  8. Ronbros

    Ronbros Torque Junkie

    Messages:
    242
    From:
    USA Austin tx.
    Car:
    opel-isuzu 1.8 turb
    i believe the original question was would porting and polishing help a stock engine, all else being equal, i doubt it!
     
  9. Chargedc20ne

    Chargedc20ne Wrench Pro

    Messages:
    25
    From:
    South Africa, Witbank
    Car:
    opel corsa 2.0L S
    We saw an increase of between 4% and 5% by porting and polishing on the standard system before we did the other work. What i can say is that the response on the diesel was better but not world changing.
     
  10. Ronbros

    Ronbros Torque Junkie

    Messages:
    242
    From:
    USA Austin tx.
    Car:
    opel-isuzu 1.8 turb
    better late than never ,, THANKS
    ron
     
  11. obi_waynne

    obi_waynne Administrator Staff Member Moderator

    Messages:
    41,250
    From:
    Deal, Kent UK
    Car:
    A3 1.4 TFSI 150 COD
    LOL - welcome back, how have you been?
     

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