HR78NX Bosch Super 4 Spark Plug x4



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includes Accessories + Fitting

Item: 970582

HR78NX Bosch Super 4 Spark Plug x4


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  • Description
  • Specification
  • Reviews
  • Delivery Options
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  • HR78NX Bosch Super 4 Spark Plug x4

    Featuring a unique state of the art design, the HR78NX Bosch Super 4 Spark Plug x4 results in improved engine smoothness and acceleration.

    HR78NX Bosch Super 4 Spark Plug x4 Extra Info

    • Superior engine versatility
    • Electrode gap adjusted ex factory
    • Noticeable improvement in acceleration
    • Significantly improved engine smoothness
    • Please note packaging may vary

    Additional Information

    Please check with your vehicle manufacturer or workshop manual to confirm the suitability of this part for your vehicle.
  • Hex Size: 16
    Thread Length mm: 25
    Thread Size mm: 14 x 1.25
  • HR78NX Bosch Super 4 Spark Plug x4 is rated 4.1 out of 5 by 7.
    Rated 5 out of 5 by from Great plugs Seem to give the car more get up and go good value for money
    Date published: 2017-03-25
    Rated 5 out of 5 by from Smooth Power Boost Brought these for my 1.7 1998 Ford Puma (on trade) and they seem to have made a difference. Its a sporty engine and the throttle response is crisper and starting seems smoother. I am yet to see if fuel economy is better (lots of motorway miles) but the logic of 4 electrodes for grounding and allowing the spark to find its best way to earth for the operating conditions seems fair. These should last longer as any arcing wont be on just one ground electrode. Its advisable to squirt the threads with WD40 or copper grease to ease removal next time they are taken out. Also ensure the threads on the head are clean and do them finger tight first!
    Date published: 2013-05-03
    Rated 1 out of 5 by from Loss of torque, avoid! I've got a 1,6 2007 Focus at 53k and these plugs have caused a loss of torque over my 15k miles old plugs the engine seems to run fine but it's lost that urge to pull at lower revs for overtaking at classic 50-70. Why do you need 4 contacts anyway? first time it picks one the other 3 dirty up and will never work again, just get in the way of clean combustion. Fuel milesage has also dropped by about 3mpg will be replacing with NGK Platinum if i can find the receipt for these.
    Date published: 2013-02-18
    Rated 5 out of 5 by from Great product, would recommend Car was running a little off and was due a service, so decided to pay the extra couple of pounds and try out these plugs. So glad I did, they have made and noticeable difference instantly. I live in a hilly part of West Yorkshire and there is far greater power when going up hill now, with less need to change down the gears. All in all the car feels smoother, with more power throughout the whole range. I would definitely recommend these plugs
    Date published: 2012-09-02
    Rated 5 out of 5 by from A good product I can feel the difference while driving. I am getting more power.
    Date published: 2012-04-05
    Rated 3 out of 5 by from Average Thougth i'd give these a try as the old motorcraft ones were getting tired and to my surprise there was no difference in performance apart from the misfire disappearing and economy the same so don't pay out thinking these will make your car go faster as they are no better than the cheaper ones.
    Date published: 2012-02-18
    Rated 5 out of 5 by from Bosch Super 4's Brought a set for a 02 1.6 Focus didn't solve the issue I had with the car but what a diffrence they have made acceleration is so much smoother would recommend to anyone.
    Date published: 2012-02-07
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  • UK Delivery

    £3.99 NEXT DAY Delivery available on orders under £40 placed by 8pm*

    Your delivery date will be communicated at checkout. Delivery times are Monday to Saturday.


    UK Delivery

    Free NEXT DAY Delivery available on orders over 40 placed by 8pm*

    Your delivery date will be communicated at checkout and on your confirmation email.

    Delivery times are Monday to Saturday. Next Day delivery not available on all products; including Built Bikes, Bulky items and Web Exclusive products.

    *Click here to learn more.


    UK Delivery

    FREE Click & Collect - you can reserve an item online and pick it up from a store of your choice

    Simply enter your Postcode on the product page to check availability, and select Click & Collect at checkout. What's more, you pay for your items on collection. Click here to learn more.

    Items in stock - collect from 1 hour
    If your item is in stock at your chosen store, you can collect it from one hour after ordering online. We'll hold your item in-store for seven days.

    Items not in stock - collect next day*
    If your item isn't in stock, we can order it to your chosen store for collection.
    *If you place your order before 8pm you can collect it from 4pm the following day (except Sundays), and we'll hold your item in-store for seven days. Bike delivery will take three days, and an extra day if you'd like us to build it for you.

    Please note that items sent directly from the supplier need to be ordered by 3pm for collection two days later. All delivery times will be shown during checkout.


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    Checkout is always via and all payment will be taken via In checkout the products will be split into separate deliveries for each supplier.

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    Price Seller Info Purchase

Some of the parts we sell here at Halfords have been reconditioned. These will carry a Refundable Deposit or an extra surcharge amount. When you add one of these reconditioned items to your basket, we'll add this extra cost automatically.

Once you've sent us your old item we'll check it over, and then refund you the full surcharge as long as everything is ok.

Before you return your old unit please make sure it's in re-serviceable condition. So if you're returning caliper casings, you'll need to double check they aren't badly damaged or broken. If the part you've sent is found to be unserviceable, we reserve the right not to refund the surcharge.

Please note that if you're returning your old unit to our National Returns Centre then this will be at your own expense.

Bosch Spark Plugs

HR78NX Bosch Super 4 Spark Plug x4

£22 The HR78NX Bosch Super 4 Spark Plug x4helps improve your acceleration