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Thread: Zetec sound?

  1. #1
    Join Date
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    Default Zetec sound?

    This is something that I've been pondering on for a little while.

    I've had this video in the back of my mind for sometime of another Zetec member's car being tuned (Brightonuk)

    https://www.instagram.com/p/B0FDHVcnkhA/

    His Zetec sounds drastically different than mine even though it's also ITB and I presume very similar exhaust setup which are pretty standard on Cats. It also revs different which could be due to gearing and appears faster due to reasons (and the very nice build he's got)


    Can other Zetec members on how theirs sounds in comparison? Different or similar? I'm not sure if this is an SVT motor, I know mine is a slightly different variation due to position of oil filler cap. Mine is likely from a Cougar being a VCT Zetec.

    Edit: After another look we might have the same model Zetecs even.
    Last edited by Vovchandr; 01-06-2021 at 09:45 PM.
    2001 Caterham Superlight R

  2. #2
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    Default

    A Duratec sound (with apex overshoot!):
    https://youtu.be/4PTMn0oCCWM
    Sean

  3. #3
    Join Date
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    Default

    2L Zetec virtually stock. Standard Caterham exhaust. Standard under bonnet plenum intake. No throttle bodies





    A few things modify the sound an engine produces:
    - microphone position
    - internal muffler baffling - if metal it corrodes over time, if that fiber fill then it burns up over time
    - the headers' shape
    - engine build spec
    - bonnet cut through or no hole for the intake. Intact bonnet mufflers the intake sound

    but the biggest thing is distinguishing between intake and exhaust noises if the engine has the standard intake or throttle bodies. Throttle bodies add so much depth to the satisfying noise an engine produces. But when recording, throttle bodies also tend to drown out the exhaust noise - even with two mics being used.


    A different Zetec - Kitcat's. 2L Zetec with a high spec. Same mic set up as my old Maroon zetec





    A couple of variations:

    1) Caterham 360R - 1.6L Sigma engine. No throttle bodies. Standard plenum intake. Two muffler UK set up for noise - one side and one under rear end used for noise.





    2) Caterham 420R - 2L Duratec. Throttle bodies. No bonnet cutout. Two muffler UK set up for noise - one side and one under rear end used for noise.


    Mike
    2021 Caterham CSR "CatKong"
    2010 Caterham CSR with Cosworth 2.3 Duratec
    2018 Caterham 420R with 2L Duratec 210hp at Donington UK
    1972 Lamborghini Espada GT
    1975 BMW CSL Group 4 (restoration finished - track set up time)
    1977 Holden Torana "A9X" (awaiting restoration)
    1985 Holden Commodore SS Group A (suspension restoration)
    1985 Holden Commodore Group A (suspension set up)
    1982 Ferrari 400i (radiator replacement)
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (dyno time)
    1990 Range Rover 2 door Classic


  4. #4
    Join Date
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    Default

    My 2.0 Zetec SVT, shown above, is totally stock, including intake, no ITB's, no bonnet cutout (all per SCCA rules and regs, to make it less competitive). No catalytic converter, but that's it as far as mods. I still prefer the sound of my X-flow Cat.
    Last edited by Kitcat; 01-07-2021 at 09:56 AM.
    Kitcat:AKA, Sir Spinsalot
    '97 Caterham Super Sprint, 1700 Crossflow-sold
    '09 Birkin S3, Duratec-sold
    '03 Caterham Zetec track car
    '19 Honda Type R, sold
    '19 Miata Clubsport

  5. #5
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    Default

    Some other things that affect sound:
    • The silencer material. Stainless steel, titanium, carbon fiber, and mild steel all sound different when they resonate.
    • Cams. My Duratec has gone through three sets: stock, Kent DTEC10 and Kent DTEC20. The sound has changed each time.
    • AFR. If the tune is on the richer end vs. leaner end, the sound tends to be a little more baritone.


    Even if the engines are identical down to the last detail, the recording and playback change will have an affect. In addition to microphone position as Croc points out, the microphone itself imparts a sonic signature, which is why many producers and musicians have their personal favorites. Also, try listening to the playback through your devices speakers then through high quality headphones. There will be a difference.

    Here is a Duratec with the DTEC20 cams and the microphone located near my left hip, so closer to the intake than the exhaust.



    And yes, crossflows do sound best :-)

    -John
    '95 Westfield SEiW w/2.0L Duratec
    '68 Lotus Elan FHC
    '91 Miata w/Flyin Miata suspension & brakes
    '95 Porsche 993 C2
    '86 Porsche 944 turbo (neglected project car)
    Throttle Steer

  6. #6
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    Kitcats and Brightonuk sound similar enough. Almost "fast/raspy" if I had to describe it. Kitcat is SVT maybe Brighton is as well? I didnt see a VCT on the valvecover in the instagram video. Maybe he will chime in at some point.

    Duratecs seem to have a similar sound as well.

    I'll provide sound video of mine once the weather permits, I don't think I have anything on hand.
    2001 Caterham Superlight R

  7. #7
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    Northern Virginia
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    I agree with the things being said about what affects the sound. My Zetec sound close to this one. I think mine is a little crisper. I credit the deep sound of mine to a Flow Master Muffler. Mine has throttle bodies, the middle Kent cams, ten to one compression (compression makes a difference) and a light flywheel.

  8. #8
    Join Date
    Dec 2013
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    Owings Mills, MD
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    Vlad,
    Really hard to compare sounds without having them side-side due to so many variables.

    Mine sounds different than the instagram post.

    Mine started as a VCT but then we swapped heads, upped compression and changed cams. Mine is still fuel injected. Lightened flywheel will make it spin up quicker. Sounds OK but could probably sound better.

    We're probably a little limited with mufflers as well.

    Jim

  9. #9
    Join Date
    Apr 2018
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    Ft Lauderdale
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    Default

    My setup

    2.0 Zetec overbored Not sure the specs on the overbore but running:
    JE Pistons 85mm
    Around a 11.1.Compression
    TMW Throttle Bodies
    Decked Block .0040"
    Oversize valves and followers
    Race Ported head
    Fidanza Aluminum Flywheel (8.5Lbs)
    Jet hot coated headers
    Kent Rally Cam
    MicroSquirt ECU
    Simson Exhaust
    Life Can Be Cruel

  10. #10
    Join Date
    May 2018
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    Default

    Quote Originally Posted by Brightonuk View Post
    My setup

    2.0 Zetec overbored Not sure the specs on the overbore but running:
    JE Pistons 85mm
    Around a 11.1.Compression
    TMW Throttle Bodies
    Decked Block .0040"
    Oversize valves and followers
    Race Ported head
    Fidanza Aluminum Flywheel (8.5Lbs)
    Jet hot coated headers
    Kent Rally Cam
    MicroSquirt ECU
    Simson Exhaust
    Thanks for chiming in! Are you SVT to begin with? Did it sound like that before the build? (I'm not sure if the build happened under your ownership or prior)



    As far as exhaust sounding different due to variations of hood cutouts and camera etc, while thats true, a drastic difference is a drastic difference.

    For the sake or argument: In motorcycle terms a 4 cylinder and 2 cylinder will have distinct sound note differences that can be told apart regardless of any other circumstances.

    The exhaust note of Brightonuk's 7 is so distinct from mine it makes me curious as to what makes that difference coming from a similar engine block. Thanks for all so far who shared their opinions and contributed videos etc.
    2001 Caterham Superlight R

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