R5RGT .21 5-Port GT Rally On Road Engine (Turbo Plug) by REDS Racing

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Frederick, MD

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REDS Racing
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This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.

This product was added to our catalog on September 21, 2015.

The REDS Racing R5RGT 5-Port GT Rally .21 On Road Engine has been developed specifically for 1/8 GT Class racing. Mario Rossi used the R5R 2.0 buggy engine as the base, then altered the tuning and shimming as needed to allow the engine to create the power needed for the necessary corner exit power, while still allowing incredibly fast top speeds.

Built using the same crankcase and crankshaft as REDSís 1/8th R line engines, the GT series features class specific timing, a 5-port liner and a 7mm venturi insert to comply with the class rules. The R5RGT uses the same low profile cooling head as the buggy edition, with an updated cooling system that has a good impact on fuel consumption and reliability.

R5 Racer engine includes: HCX horizontal carburetor; silicone filled and tuned crankshaft; sleeve with 5 inlet ports and single exhaust port; high performance made in Japan front ball bearing; steel made in Switzerland rear bearing.

Why should you buy a R5RGT?

REDS offers one of the most advanced and innovative products on the market at a mid range street price. It was developed and tested in cooperation with REDS' best drivers. All R5R engines are subjected to strict quality controls to guarantee performance repeatability and greater reliability. REDS Racing products are made in Italy and individually tuned.


  • Ultra-light, only 348g
  • 5 Ports hard chromed liner
  • CNC machined billet piston
  • New separated and cooled combustion chamber
  • Lightweight cooling head
  • 14mm crankshaft
  • Knife edged aerodynamic connecting rod
  • Swiss Made rear bearing
  • Long needle composite HCX slide carburetor
  • For the GT class REDS recommends the 2113 tuned pipe paired with the XS manifold

Displacement: 3.5cc
Bore: 16.26mm
Stroke: 16.80mm
Weight: 348g
Front Bearing: 7x19x6
Rear Bearing: 15x25.4x6
Recommended Pipe: EFRA 2113/XS (2104/XS is another choice)
Recommended Glow Plug: REDS TS7 (included)
Recommended Fuel: 25-30% nitro, 8-10% oil
Break-In Fuel: 12% oil