proper engine shutoff

[Tarant]

well they both get hot but the piston is made of AL and the sleeve is ABC so they both cool at different rates the sleeve will cool faster so if the piston is at TDC it will be pinched at the top and after time the sleeve will be to big to creat good pinch or compression

 

[.21Rc10GT]

The sleeve isnt ABC, it is brass with chrome plating (BC) the piston is aluminum, whichs makes the A in ABC.

 

[Tarant]

my bad thanks

 

[olds97_lss]

The sleeve is a fraction of a mm smaller at the top than the piston. This is what creates compression. This is also why it's recommended that you run your engine at least over 200 degrees F. At 210-270 (approximation) the sleeve has expanded to it's running diameter as well as the piston, so there's minimal pinch when things are hot. The pinch exists when it's cold and everything has shrunk to it's resting state. When you have no pinch left when it's cold, the engine is on it's way out. Reason being is that it expands as it gets hot, no pinch means that the fraction of a mm that creates compression is now larger and the compression passes the piston when the fuel/air mixture explodes.

 

[JESSE G]

Ok cool that good to know I will do that now everytime I run my engine so It will last longer thanks for the info

 

[Nevaren]

Bonus Photos!










Part # Pcs. Description Price
85068 1 Safety Engine Stop System $5.00



New for HPI Savage owners is a Safety Engine Stop System, designed to make shutting off the nitro engine safe and easy. Just press the conveniently located stop button and the engine immediately stops, no fumbling to pinch the fuel line or covering the hot exhaust necessary. Careful attention has been paid to the design and location to prevent accidental shut-offs. The design incorporates a spring mounted nylon arm that slides against the flywheel when pressed, a safe way to stop the engine that avoids dangerous lean carburetor conditions associated with pinching the fuel line. Installation is simple, all of the necessary mounting points are already on every Savage ever made. Complete instructions and mounting hardware are included.

 

[greenwing7]

in the OS manual it says to pinch the fuel lines

 

[XXX-NT Dee]

The first time i shut mine off i had the servo backwards and instead of shutting it off it gun forward and finaly stopped itself

 

[46U]

I plug the exhaust and I have never had a problem restarting any of my 4-nitro vehicles.

 

[BOWTIE1]

the best way to shut off the motor is put yur thumb on the flywheel and puush on it it will kill the motor ........ if u put your finger over the exhaust pipe it can hydro lock up the motor and bend the rod i have seen it happen... if u pinch the fule line u lean the motor out and cmke it to run in high rpm's that can cause damage ......every1 has there own way i think if u have a serew deuver and use the handle on the fltwheel is the best or your finger depends on your ... i always use my thumb on the flywheel everytime ....