CMB 91RS M-Line - Which plug?

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Jake Ellwood

Well-Known Member
Joined
Aug 11, 2019
Messages
58
Hi there,

I recently picked up a CMB 91RS M-Line, have never owned a CMB before. Can't find any recommendations regarding a plug. I am assuming these are a hot engine so require a cold plug, can anyone with experience confirm this? It will be run on 25% Nitro if that makes any difference :)

Thanks in advance!
Jake
 

gilbert galli

Active Member
Joined
Apr 27, 2013
Messages
34
os turbo glow plugs rp7 or rp8 are very nice,
you must not use conical glow plugs type novarossi, the cone has a different angle
 

Jake Ellwood

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Aug 11, 2019
Messages
58
Thanks Gilbert! Just checked and that's a cold plug. Excellent. I've already got some OS A5s in stock which are cold and go well in our MACs so I'll use one of those!
 

Jake Ellwood

Well-Known Member
Joined
Aug 11, 2019
Messages
58
Yep I noticed earlier when I tried to put an A5 in it it's just too small. Looking at your link you can see the turbos are thicker! So will get some ordered. Thank you :)
 

phill fields

Well-Known Member
Joined
Nov 5, 2011
Messages
76
Hi guys I've run this engine on 25% with O'Donnell 299T with great success in Europe (Endurance racing). And with 40% in my hydro the same plugs are great. Have tried other brands and have never had the same constancy that I get with O'Donnell.
 

ALLAN YUEN

Well-Known Member
Joined
Jan 14, 2005
Messages
5,544
Which one did you use : cone glow plug or standard glow plug for new CMB91 RS M-line red head?
 

gilbert galli

Active Member
Joined
Apr 27, 2013
Messages
34
Allan, the glow plug cone CMB Picco OS is different, if you put a novarossi glow plug it works, but the tapered range of the cylinder head will be deformed, there will be leakage with loss of compression and oil from everywhere on the engine, AXE Rossi manufactures turbo xt with OS cone, the rt are similar to novarossi
 

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