here is the problem..........when you go to tight with head clearance detonation may occur and the visible result is the top of the piston and combustion chamber popped........in this case the damage is done and your engine will never perform as good as before until you change piston/liner and combustion chamber.........

sometimes when you're lucky the glow plug burns itself and it's a sign that the head clearance too small, or your carb setting is too lean.......then you just have to replace the glowplug and check the carb setting and head clearance.......

YIKES! So, atleast put one .1mm shim on there just to play it safe and richen the HSN?

yep.....if want to be safe add one 0.1 shim.........
about the HSN comparing 25% to 30% nitro you usually set rich with higher nitro content......but it's a slight difference, not related to be safe or not, just because higher nitro content increases explosion and build more heat in combustion chamber

So by how much would I have to richen it up? Just basically tune for performance right?

Could someone post the exact measurement of the LL3 main bearing?

yep

Looks pretty light...

Wow, what engine is that?

11.5 x 21 x 5 mm

Guys, help please.. anyone?

my engine tuner (20+ years nitro engine building)

said pretty much all engines are 2.5 turns out on high speed
and 2 1/4 turns or flush on thelow end

heys guys
what do u think of the novarossi N12 LL3 .12 turbo ?

how do the microcast internals last ?
are there any advantages/disadvantages with this engine ?


Thanks
John

5 out on the bottom and 3.5 out on the top should have
you in the ball park

He has obviously never touched a nova based engine before

indeed.......

i checked an engine here and the LSN is 4 turns open.......

and the HSN is almost flush, slightly open from flush.........