The solder trick is a good solid methode... Bend a piece of solder into an L-shape and put it through the plughole, turn the engine arround so the solder will be squeezed and measure the thickness of the solder. It must be arround 0.6mm

I do not think there is much a difference, only the afterwork and better selected P/S is giving the R09 better performance.

Roelof,0.6mm is for engine 2.1cc or 3.5cc?
tq

That is for the .21 (older models)

Today I have seen 0.5mm although if you are going to build up an engine 0.6 is a very good starting point for every Novarossi. The newer button heads and also the nr8 plugs makes it possible to go as low.

Hi guys, I need a favour. What do you think of Gimar 9.2c ? I can decide either that or latest novarossi virtus .21

Hi Roelof, which do you think is right distance in a Collari Cordoba Edition? The distance without head shims is 0.35-0.4 (solder trick). Usually I use the engine at sea level. I have thought to up to 0.6, it is right? I can use this distance with OS plugs or only with new Nova plugs?
Thanks.

All Nova onroad engines @25% nitro can use 0.5~0.7 @sealevel. 0.6 is a good starting point using a NR plug 7 or 8. When using the 8 plug a 0.5~0.55 is possible depending if it is a long or short track....
When the engine is at high RPM the flex and play in the whole system does make the head clearance smaller that can blow plugs....

I have seen a person who did get a RB engine from a teamdriver and with running NR7 plugs he constantly blew plugs while the teamdriver running 8 plugs did not distroy them. Adding one shim of 0.1mm did sove the problem without (for him) noticeable power.

OS plugs can be used, I was told the RP8 is a good plug.

A friend give me an old, but not use, collari cordoba edition. The engine has 0,35-0,4 mm of head clearance without head shims. But!, it has 0,7 mm of head sihims so 1,05-1 mm of combustion chamber...directly of factory!! Do you thinh it is possible? When I test the engine I felt no power on low range, of course.

That is why I do not trust counting shims, probably his head has a zero gap without shims. Or maybe you were fooled with your head because sometimes there are 1 or 2 thick aluminium shims that tight giving the idea that it is a part of the button head.

For sure 1mm is to much or you must run the hot OS RP3 plugs

jp still good

Still have 2 x Brand New JPGIMAR R09.1 will do for $550US + Freight each. PM if interested.

Hello ,

What is the right temperature for Gimar 7.1 ?

Thank you .

Depending the exhaust and fuel it will be arround 100 up to 120 degrees C

The exhaust is Nova 2015 and fuel MLC 25% .

Thank you

I can't speak for the 9.2c but I have a Virtus and that baby is a beast; and a mind you, that's in a heavy GT car. And if you don't find that engine powerful enough stock , you can always get it modified to make it just stupid fast.

Hi everybody,

We finally got our redesigned shop up and running :-)...

Still many products to come, we got a lot that's not yet inserted.

But at least the shop is running now.

Take a look: www.rc-netshop.dk