Murnan Modified Motors
#3046
Hi,
My MM 35 plus got a strange problem, when idle long then put on throttle, a large pop noise came from exhaust, then the plug was brown.
The 2nd plug works fine, but it's brown again when out of fuel.
The bearings are new, using Odonell99 t, Tornada 25% fuel, any idea. Thx
My MM 35 plus got a strange problem, when idle long then put on throttle, a large pop noise came from exhaust, then the plug was brown.
The 2nd plug works fine, but it's brown again when out of fuel.
The bearings are new, using Odonell99 t, Tornada 25% fuel, any idea. Thx
#3047
Tech Rookie
Hi Uriah,
Do you recommend picco or nova plugs (are they compatible) for your M21? I will be using the picco 2033 pipe and tornado 25%.
Many thanks,
Brian
Do you recommend picco or nova plugs (are they compatible) for your M21? I will be using the picco 2033 pipe and tornado 25%.
Many thanks,
Brian
#3048
Tech Addict
The plug surrounding is slightly wet, proper tune (I think so), good temperature, new rod.
#3049
Sounds like bad plugs. Try a novarossi, or maxpower plug. The tune could be off. Do you think the bottom is too rich, and top lean?
#3050
Tech Addict
I guest it's lean on top, There is less smoke when almost 1/4 tank. I did the pinch test, LSN is right about, 4-5 sec to stall and slightly rev abit, so I will try Nova plug, thx!
#3051
Tech Addict
#3052
Tech Rookie
Uriah did the break-in for me. I am going to test it this weekend at the club race but I am not sure what plugs to use. Does it matter if it's a picco based engine? Should I use Picco plugs? Or would nova (or even O'donnell) plugs be a better fit?
#3053
Tech Addict
I heard some Picco users using OS plug
#3054
I prefer to use the Picco plugs in the Picco engines. I use the Picco P7TC Cold for on road .21. You can also use Novarossi Plugs in the Picco engines. The C8TGH works well too.
#3055
Tech Master
#3056
Dyno Video
Here is a short video of one of my Novarossi 35+21's on the dyno.
http://www.youtube.com/watch?v=htaW_...qtwPWmdNd9huyq
http://www.youtube.com/watch?v=htaW_...qtwPWmdNd9huyq
#3057
Tech Addict
#3058
Turbo scoop
I am curious about the function of the turbo scoop on the back of the crank, and the variation one can see among brands.
Any views or opinions?
I saw an old thread with one post saying there is very little performance difference.
Thanks for the education.
Any views or opinions?
I saw an old thread with one post saying there is very little performance difference.
Thanks for the education.
#3059
The Turbo Scoop helps the fuel make the turn from the crankshaft bore, into the block. This way all of the fuel does not have to bounce directly off the backplate, and then make a 90 degree turn. There are different variations on this. Single turbo, Biturbo, Triturbo scoops. The turbo scoop does add power.
#3060
If the turbo scoop has been cut beyond the sweet point, fuel will be excessive and stay in the lower chamber. That is the case of flooding at low rpm...
The size of the crank hole and scoop is directly related to crankcase volume , size and number of transfer ports, and it will affect positively or negatively the maximization of gas mass flow and speed, from the case through the ports and into the combustion chamber.
So if badly done there will be losses and no gain. If properly done, even minimal gains will be gained.
AFM