HI,
A have seen on the novarossi web site that they recommended a head clearance of .03 for a Long stork motor Give a look to your glow plug. Please see below:
The simplest accessory to check is the glow plug but it is also the one which gives you the exact image of the engine health. The thread is silver colored but is made with an alloy composed by Platinum and Rhodium! To keep a constant look at glow plug will help you to understand how to make the carburetion. In the following way:
1) Take the glow plug away and look at the thread:
If the spiral of the plug is a little bit pressed and bent it means that the engine is too compress. If you are racing on a sea level track, with 25% or more nitro could be the main reason. Than you need to check under head shims and in case insert a tenth.
2) If the thread has a dull, as sanded, it means that the carburetion is too leaning (poor of fuel) and you can damage the engine. You run the risk to break the thread and to make it fall down on the top end of the piston, damaging also the sleeve. In both these cases, we suggest you to replace the old with a new plug.
3) If the thread has a dark color and the plug seems humid, the carburetion is too rich and the engine does not work at its best. You have to lean the carburetion closing the full speed needle.
4) When the thread is polished and the spiral does not present any imperfections, your engine carburetion is ok.
Standard shims into Novarossi factory engines:
Cubic Capacity Shims in mm
2,1cc 0,3 mm
2,5cc 0,3 mm
3,5cc Start 0,3 mm
3,5cc Short stroke 0,6 mm
3,5cc Short stroke 1B 7 ports 0,3 mm
3,5cc Long stroke 0,6 mm
3,5cc Long stroke Marine 0,3 mm
8,3cc 0,2 mm
10cc 0,2 mm
Very important:
During the installation of a turbo glow plug on the under head verify that no dust or any other material come inside because they could make precarious the seal of this glow plug during the compression.
My head clearance with no shims is .08 when I ran it was very strong but eat up plugs. I then increased it to .12 and it still eat up plugs I now have it a .16 I’m not eating plugs but I did have a drop in performance.
With this setup I can run full are half throttle but if I come in to a turn hot and start to let off the throttle she will die coming out of the turn.
I do not know if the two problems are related any suggestions.
A have seen on the novarossi web site that they recommended a head clearance of .03 for a Long stork motor Give a look to your glow plug. Please see below:
The simplest accessory to check is the glow plug but it is also the one which gives you the exact image of the engine health. The thread is silver colored but is made with an alloy composed by Platinum and Rhodium! To keep a constant look at glow plug will help you to understand how to make the carburetion. In the following way:
1) Take the glow plug away and look at the thread:
If the spiral of the plug is a little bit pressed and bent it means that the engine is too compress. If you are racing on a sea level track, with 25% or more nitro could be the main reason. Than you need to check under head shims and in case insert a tenth.
2) If the thread has a dull, as sanded, it means that the carburetion is too leaning (poor of fuel) and you can damage the engine. You run the risk to break the thread and to make it fall down on the top end of the piston, damaging also the sleeve. In both these cases, we suggest you to replace the old with a new plug.
3) If the thread has a dark color and the plug seems humid, the carburetion is too rich and the engine does not work at its best. You have to lean the carburetion closing the full speed needle.
4) When the thread is polished and the spiral does not present any imperfections, your engine carburetion is ok.
Standard shims into Novarossi factory engines:
Cubic Capacity Shims in mm
2,1cc 0,3 mm
2,5cc 0,3 mm
3,5cc Start 0,3 mm
3,5cc Short stroke 0,6 mm
3,5cc Short stroke 1B 7 ports 0,3 mm
3,5cc Long stroke 0,6 mm
3,5cc Long stroke Marine 0,3 mm
8,3cc 0,2 mm
10cc 0,2 mm
Very important:
During the installation of a turbo glow plug on the under head verify that no dust or any other material come inside because they could make precarious the seal of this glow plug during the compression.
My head clearance with no shims is .08 when I ran it was very strong but eat up plugs. I then increased it to .12 and it still eat up plugs I now have it a .16 I’m not eating plugs but I did have a drop in performance.
With this setup I can run full are half throttle but if I come in to a turn hot and start to let off the throttle she will die coming out of the turn.
I do not know if the two problems are related any suggestions.
