K24A 87mm Forged Performance Short Block – Track / Road Build

Price: £4,100

A fully built, precision-engineered K24A short block designed for high-performance road and circuit use. Developed through extensive real-world testing in K-swapped platforms including Lotus Elise / Exige, EP3, and DC5 applications.

This is not a budget rebuild — it is a carefully selected, blueprint-level engine designed for reliability under sustained load, high RPM operation, and track abuse.

ENGINE SPECIFICATION

Base Engine

• Honda K24A OEM block (hand-selected low-wear core)
• 87mm bore (only blocks with true round, low-wear cylinders used)
• Torque plate bored & honed on Rottler F10X
• Line honed main tunnel
• Decked block surface
• Ultrasonic cleaned throughout

Rotating Assembly

• OEM Honda forged crankshaft
• Forged 87mm pistons (12.5:1 compression – SC71422XA)
• Precision ring end gap setting (individually measured & matched)
• DLC diamond like carbon  coated piston rings
• Fully balanced rotating assembly

Rods (Customer Choice) Eagle h beams as standard 

• Manley H-Beam
• Eagle H-Beam
• SpeedFactory H-Beam
• Sainz I-Beam
  (price varies depending on selection)

Bearings & Fasteners

• OEM Honda rod bearings (blueprinted clearances)
• OEM Honda main bolts (brand new)
• OEM Honda girdle bolts (brand new)
• ARP head studs installed
• OEM oil gallery plugs (brand new)

Machining & Assembly

• Fully blueprinted clearances (piston-to-wall, oil clearance, end float)
• Plateau honed cylinder finish
• Crank end float set to specification
• Precision ring gapping per cylinder
• Ultrasonic cleaned components throughout assembly

DEVELOPMENT & DESIGN PHILOSOPHY

This engine package has been refined over years of real-world use in both road and dedicated track applications, particularly K-swapped Lotus Elise / Exige builds and high-output Honda platforms.

The K24 platform presents unique challenges in oil control and bearing stability under sustained high RPM. This build prioritises:

• Stable oil pressure to main and rod bearings
• Balanced rotating assembly for high RPM durability
• Controlled clearances for thermal stability under load

In track applications, this configuration has demonstrated exceptional durability with minimal bearing wear when maintained correctly.

POWER & APPLICATION

When paired with appropriate supporting modifications such as DC 004 cams and Supertech SPR-H1021D 92lb valve springs, this short block is capable of:

Estimated Output: 340–350bhp

Applications include:

• Lotus Elise / Exige K-swap builds
• Honda EP3 Type R
• Honda DC5 Integra Type R
• High-performance road or circuit builds

IMPORTANT NOTES

• Blocks are carefully selected — not all K24 cores are suitable for 87mm bore
• Some engines require rejection due to bore wear or ovality
• 87mm specification is preferred to maintain block strength and head gasket integrity
• Oil squirters may be blocked or omitted depending on application to optimise bearing oil pressure

WHY THIS BUILD IS DIFFERENT

Most budget K-series builds rely on generic bearing clearances and mixed aftermarket components.

This build is based on:

• OEM Honda precision components where critical
• Tight machining control (Rottler F10X blueprint standard)
• Proven track-tested configuration
• Consistent repeatability across multiple engines

This is a reliability-first performance engine, not a lowest-cost assembly, ready to ship