1LikesWHAT RED PUTTY IS USED IN THE CRANK SHAFTS
02-28-2007, 04:37 PM
#47
Originally Posted by stefan
Oh, so all the real fast engines like Murnan's or JP's are drilled for their personal amusement?
Sorry I didn't know that. I actually started modding engines at the same time as Uriah Murnan (we raced at the same track), so I guess I've been doing everything wrong all those years.
DAMN!
Sorry I didn't know that. I actually started modding engines at the same time as Uriah Murnan (we raced at the same track), so I guess I've been doing everything wrong all those years.
DAMN!
Info on the OS Speed motor: The Crank's exterior is specially coated to minimize friction, the crankshaft also features a large mixture passage "filled with silicone to increase crankcase pumping pressure".
Same goes for quite a few companies , not even modifiers who add in silicone to the cranks. I know ive seen them first hand and have removed the silicone to do my own job and there is no extra drilling to be seen. Some maybe drilled , but it doesnt have to be drilled to have more crankcase pumping pressure or find benefits from using the technique.
So yeah , one could lean to the fact that you might be.
02-28-2007, 06:34 PM
#48
Originally Posted by stefan
When an engine is modified (as in JP, Murnan,etc) the crankshaft is drilled out (towards the clutch) to make it lighter. The whole needs to be closed to keep crankcase volume consitant. Here is where the silicone is used. It does build a ramp that might help with gas flow, but that is NOT the primary reason to put it in.
If it doesn't do anything why did novarossi come out with a tunned version which the only difference is the flow ramp on the crank.
02-28-2007, 08:42 PM
#50
Originally Posted by stefan
Oh, so all the real fast engines like Murnan's or JP's are drilled for their personal amusement?
Sorry I didn't know that. I actually started modding engines at the same time as Uriah Murnan (we raced at the same track), so I guess I've been doing everything wrong all those years.
DAMN!
Sorry I didn't know that. I actually started modding engines at the same time as Uriah Murnan (we raced at the same track), so I guess I've been doing everything wrong all those years.
DAMN!
thanks, drive through.
02-28-2007, 09:38 PM
#51
Tech Initiate
Some old photos of my engines modification 
02-28-2007, 09:43 PM
#52
Tech Initiate
Some more photos
02-28-2007, 09:52 PM
#53
Tech Initiate
some more
02-28-2007, 10:06 PM
#54
Originally Posted by MRX4-R03
Well Stefan a ns12s3 crankshaft is the same as a JP FX t03 crankshaft same inner diameter and no the JP is not drilled out bigger towards the "clutch" so why does he put the flow ramp there.
If it doesn't do anything why did novarossi come out with a tunned version which the only difference is the flow ramp on the crank.
If it doesn't do anything why did novarossi come out with a tunned version which the only difference is the flow ramp on the crank.
Hard to explain. Pull the silicone out of a JP crank and you know what I mean.
02-28-2007, 10:08 PM
#55
Some more photos:
02-28-2007, 10:14 PM
#56
some more: 
02-28-2007, 11:16 PM
#57
Originally Posted by stefan
It's not drilled bigger, it's drilled BEHIND the silicone, where the regular crank is solid.
Hard to explain. Pull the silicone out of a JP crank and you know what I mean.
Hard to explain. Pull the silicone out of a JP crank and you know what I mean.
This what JP says:
EFRA Crankshaft The modified and lightened crankshaft is filled with the special red putty which is positionned to improve the gas passage. In order to reduce the friction and the wear, the crankshaft is HardBlack coated.
03-08-2007, 04:54 AM
#59
Guys, I'm new to nitro. Are there any mods i can do to a ofna force .28? THANKS 
