edisoname

Hi there:

When i use the standard plug underhead on my SIRIO.27 RACER, should i use one washer or two ?
Please advise.
Thanks for any replies.

motionmachine

one

edisoname

Hi buddy,

Thanks for your reply, can i ask are you sure about this please ? Because i don't want to break the engine with my mistake.

Please advise guys !!

Thank you !!

motionmachine

Nearly all glow plugs come with a spare "crush seal" (copper gasket) just in case you need to remove the plug for any reason. Technically, your supposed to use it (seal) once, then toss it out when R&R the same plug but most typically reused the same one (seal) till the plug pops.
I cant recall any engine that ever REQUIRED 2 seals to be used on the glow plug.
I suggest you follow the manufacturers plug selection for break in, then compare the "suggested" plug length (threaded portion) to others to determine compatability.

edisoname

Hey man,

Thanks for your reply, but i think you miss understand me. I'm talking about the standard plug head shim not plug washer.
I want to know how many shim should i use for a standard plug head.

Please advise Thanks !

motionmachine

Oh I see. You want to know how many Head Shims (gaskets) are required for a standard head?
Did you change from a turbo head or what? Anyhow, how many shims did it have when you disassembled it? To be safe, I'd install the same number of shims as it had prior to the swap/repair.

edisoname

Hi buddy,
Thanks for the reply !

It comes with a turbo head and with 2 shims on it, just wondering when i change to a standard head, should i take off one or not.

motionmachine

Running 20% nitro? Use them all just to be safe. Thats a nice motor, Im like you, Id hate to see it scraped.
You can remove head shims (16% or lower nitro content) and/or add more shims (35% or higher nitro content) but all that is best left to very experienced tuners.
Its much to difficult to explain in depth but it comes down to detonation or pre-ignition, to much compression (not enough shims) can cause pits to occur in the combustion chamber (top of piston and head).

edisoname

Hi man,

Thanks for your reply, that really helps !
Nice !