- Joined
- Oct 25, 2004
- Messages
- 1,131
Brad,Very nice Jim!!
Brad
there is no doubt that the silicone is there a reason. have ran .12's and .21's for over 20 years in on-road cars and the throttle response and spool up is so much faster!!! i clean out my motors with LPS 2 and have never had an problem ever!Joern,
Does anyone think that an engine manufacturer of a high performance racing engine would waste the time & money to put something in an engine for no reason? I definitely can not speak for any NR front intake crankshaft. However, I am absolutely sure from many bench & data logger tests of the Nelson .45 long stroke, front intake engine, "that a properly shaped ramp", when inserted with J-B weld will allow the engine to "turn faster & pipe up easier". We see an engine RPM increase on the high end of 200 to 400 RPM as well as the plane piping up easier when it leaves the ground on take off. We have experimented with many different compounds, including various silicones, unsuccessfully! When the ramp's shape is predetermined with a machined linen based phenolic piece, which is glued in place with J-B weld & then coated with J-B weld, the ramp remains for an indefinite period of time. Solvents & oils have no effect on the cured J-B weld material. The posted photos show how the crankshaft needs to be roughed up in the area where the ramp is to be glued in. After first glueing the ramp in, it is then coated with a very thin layer of J-B weld. Both operations are cured in an oven at 125* F. Notice how smooth the final ramp is & how consistent the shape is from the method used.
Jim Allen
I use atf mercon or dextron as after run oil in my ramped engines, never had any problems with the ramp swelling or coming apart, i dont think the ramp is for wot only, i think it helps when milling mid range throttle and wot throttle. Rc 90 boat.
Dave,Jim
How about machining a delron ramp and pressing it in the crank.
Dave
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