Ford DOHC I4 Sierra Tuning Guide

It’s commonly believed that this engine is merely a Pinto with a twin cam alloy head bolted on, much like the Cosworth YB. Well, it isn’t, the only thing this engine has in common with the Pinto is that it replaced it in the Sierra in August 1989. Rather confusingly, it’s called an I4, which is also the code name of the current Duratec HE although again, it has nothing to do with that engine either.

Available in two basic versions - 8-valve Sierra / Scorpio and 16-valve Escort RS2000 Mk5 / Scorpio, the I4 has chain driven cams, a cast iron block and an alloy head with hydraulic tappets. It’s a pretty robust unit where every component is built nice and chunky - the cams look like they’re on steroids, whilst the flywheel is a whopping, heavy component.

Basically the engine is meant as a cruiser, especially in 8-valve format although it can be tuned to give reasonable power. The RS2000 engine came with 150bhp and it has seen as much as 230bhp wrung from its bores.

Not a particularly popular choice then, there is little available in the way of performance parts apart from complete induction swaps on RS2000 engines to the likes of throttle bodies and twin DCOEs. Good gains can be made but the engine is harder to tune especially when more straightforward engines are available.

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  1. Wossner forged piston & PEC H beam steel rod kit 86.5mm: Ford Escort RS2000 16v high compression K9544D050KH
    £1,351.25 (inc VAT)
    (ex VAT) £1,126.04

    Part Number: K9544D050KH

    Wössner pistons feature a unique PTFE coating on the skirts.... Learn More
    No Stock - ordered on demand
  2. Wossner forged piston & PEC H beam steel rod kit 86mm: Ford Escort RS2000 16v high compression K9544DAKH
    £1,351.25 (inc VAT)
    (ex VAT) £1,126.04

    Part Number: K9544DAKH

    Wössner pistons feature a unique PTFE coating on the skirts.... Learn More
    No Stock - ordered on demand
  3. PEC steel H section con rod set 149.5mm: Ford RS2000 2.0 16v G0132
    £636.94 (inc VAT)
    (ex VAT) £530.78

    Part Number: G0132

    Stock Lead Time Typically 2-3 weeks
  4. Wossner forged piston kit 86.5mm: Ford Escort RS2000 16v high compression K9544D050
    £849.43 (inc VAT)
    (ex VAT) £707.86

    Part Number: K9544D050

    Wössner pistons feature a unique PTFE coating on the skirts.... Learn More
    Stock Lead Time Typically 1-2 weeks
  5. Wossner forged piston kit 86mm: Ford Escort RS2000 16v high compression K9544DA
    £849.43 (inc VAT)
    (ex VAT) £707.86

    Part Number: K9544DA

    Wössner pistons feature a unique PTFE coating on the skirts.... Learn More
    Stock Lead Time Typically 3-4 weeks
  6. Jenvey single cable Heritage throttle body linkage CLS3
    £189.95 (inc VAT)
    (ex VAT) £158.29

    Part Number: CLS3

    A fully adjustable single cable linkage kit to fit Jenvey He.... Learn More
    Available From Stock
  7. K&N oil filter Ford Zetec E, Zetec SE 1.6\1.7 & DOHC 8v KNHP-1002
    £13.00 (inc VAT)
    (ex VAT) £10.83

    Part Number: KNHP-1002

    K&N Premium Wrench-Off Oil Filters are specially designed fo.... Learn More
    Available From Stock
  8. K&N oil filter: SOHC Ford Pinto, YB Cosworth 4wd, Essex V4\V6, Taunus\Cologne V4\V6, RS2000 16v & 2.9 24v BOA KNHP-2004
    £13.00 (inc VAT)
    (ex VAT) £10.83

    Part Number: KNHP-2004

    K&N Premium Wrench-Off Oil Filters are specially designed fo.... Learn More
    Available From Stock
  9. Water pump Ford 2.0\2.3 DOHC 8v\16v later 3 bolt pulley type - Galaxy Mk1\Mk2 QCP2887
    £44.50 (inc VAT)
    (ex VAT) £37.08

    Part Number: QCP2887

    Available From Stock
  10. Water pump Ford 2.0\2.3 DOHC 8v\16v early 4 bolt pulley type - Sierra, Escort RS2000 16v, Granada, Transit QCP2934
    £42.50 (inc VAT)
    (ex VAT) £35.42

    Part Number: QCP2934

    Stock Lead Time Typically 4-7 days
  11. Clutch release bearing: Ford Escort Mk6 (IB5 gearbox) & Escort Mk5\6 RS2000 MTX75 ECB272
    £49.90 (inc VAT)
    (ex VAT) £41.58

    Part Number: ECB272

    Available From Stock
  12. Kent Cams competition camshafts (pair): Ford Galaxy\Scorpio Ultima DOHC 2.3 16v KCRS2301
    £750.95 (inc VAT)
    (ex VAT) £625.79

    Part Number: KCRS2301

    Competition camshaft, suitable for engine with modified ECU,.... Learn More
    Stock Lead Time Typically 4-7 days
  13. Omex water coolant temperature sensor Ford push-in OMEM2202
    £24.00 (inc VAT)
    (ex VAT) £20.00

    Part Number: OMEM2202

    Available From Stock
  14. Omex water coolant temperature sensor Ford screw-in M12x1.5 OMEM2203
    £24.00 (inc VAT)
    (ex VAT) £20.00

    Part Number: OMEM2203

    Available From Stock
  15. Omex ECU communication cable - RS232 (COM) extension lead OMEM001
    £7.20 (inc VAT)
    (ex VAT) £6.00

    Part Number: OMEM001

    Available From Stock
  16. Omex ECU communication RS232 to USB adaptor OMEM002
    £36.00 (inc VAT)
    (ex VAT) £30.00

    Part Number: OMEM002

    Available From Stock
  17. Road spec basic wiring harness loom for Omex 200 ECU (ignition only) OMEM1412
    £156.00 (inc VAT)
    (ex VAT) £130.00

    Part Number: OMEM1412

    PVC tubing and harness tape, ready built harness for basic N.... Learn More
    Stock Lead Time Typically 1-2 weeks
  18. Road spec basic wiring harness loom for Omex 600 ECU (ignition & fuel injection) OMEM1419
    £306.00 (inc VAT)
    (ex VAT) £255.00

    Part Number: OMEM1419

    PVC tubing and harness tape, ready built harness for basic N.... Learn More
    Stock Lead Time Typically 3-4 weeks
  19. Road spec basic wiring harness loom for Omex 600 ECU (ignition & fuel injection) with MAP connection OMEM1419A
    £324.00 (inc VAT)
    (ex VAT) £270.00

    Part Number: OMEM1419A

    PVC tubing and harness tape, ready built harness with MAP se.... Learn More
    Available From Stock
  20. Race spec basic wiring harness loom for Omex 200 ECU (ignition only) OMEM1512
    £210.00 (inc VAT)
    (ex VAT) £175.00

    Part Number: OMEM1512

    Heat shrink sleeved, ready built harness for basic Naturally.... Learn More
    Stock Lead Time Typically 4-7 days
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