Remote-controlled thermal engine O.S. Turbo RP8 Spark Plug

In RC thermal modeling, the RP8 TURBO is often used:

• in cold weather,
• with little nitromethane,
• on engines that are difficult to tune,
• to greatly improve idle and throttle response.

When to use an O.S. RP8 TURBO glow plug?

I especially recommend the RP8 TURBO in the following situations:

• winter,
• low outside temperature,
• engine stalling at idle,
• difficult engine starting,
• low-nitro fuel,
• searching for a very smooth engine.

It greatly helps:

• maintain the glowing filament,
• stabilize idle,
• improve low-end throttle response,

• make the engine more "user-friendly."

Why is the RP8 TURBO hotter

A hot glow plug retains more heat in its filament.

The RP8 TURBO heats up faster and stays hot longer.

This promotes:

• easier combustion,
• better ignition of methanol,
• more engine stability.

However, a glow plug that is too hot can become problematic:

• in high heat conditions,
• on very powerful engines,
• with a lot of nitro,
• in intensive competition use.

Difference between RP6, RP7, and RP8 TURBO

The main difference lies in the operating temperature.

When to choose the RP6 TURBO?

The RP6 TURBO remains ideal:

• in summer,
• on hot tracks,
• with a lot of nitro,
• on very powerful engines,
• in aggressive driving.

It better limits:

• overheating,
• pre-ignition,
• full-throttle cuts.

When to choose the

• at moderate temperature,
• on slightly difficult to adjust engines,
• to maintain a good compromise between responsiveness and stability.

When to choose RP8 TURBO?

RP8 TURBO becomes very interesting:

• in winter,
• when the engine easily stalls,
• with low nitro fuel,
• to facilitate adjustments,
• on engines that are a bit finicky at low RPM.

I find that it greatly improves ease of use in cold conditions.

Beware of high temperatures

RP8 TURBO can become too hot:

• in the middle of summer,
• with a lot of nitromethane,
• on large competition engines.

In these cases, the engine can:

• heat up more,
• become less stable at high RPM,
• cause pre-ignition.

Turbo spark plug only

Like RP6 and RP7, RP8 TURBO only works on:

• turbo engines,
• conical heads,
• engines designed for turbo spark plugs.

It cannot be mounted on a standard classic glow head.

My opinion on RP8 TURBO

Honestly, RP8 TURBO is an excellent spark plug for:

• low temperatures,
• easy adjustments,
• engines lacking stability,
• pilots looking for a flexible and very easy to start engine.

I find it particularly pleasant:

• in winter,
• for leisure,
• or when you want to simplify the adjustments of a thermal RC engine.

RP6 remains better under very heavy load, RP7 remains the most versatile, while RP8 mainly focuses on ease of operation and cold stability.