Sirio Engine / Glow plug Question

[Danny McGee]

Hi All,

So im new to all this 8th stuff and went to put the glow plug in this evening to fire up the car for the first time and it wouldnt fit. I've just taken the head off to have a proper look at the thread and its clearly a different size.

I have been told that the plugs that i should use to start are the os p3's and the engine i have is the one below;

Sirio s21-bxt1r

Displacement 3,5 cc
Stroke 16,80 mm
Bore 16,22 mm
Ports 5
Sleeve ABC
Exhaust Rear
Weight 370 g
Crankshaft Ø 14,20 mm SG Type
Carburettor Type CNC Aluminium Slide Single Adj.
Plug Type Turbo
Power Comparison 9

Any thoughts on whats wrong and what i need? And for reference when the heads off there is a what looks like an alu plate with the thread in.

Cheers

Danny