SKU: ENG-Stumble-Valve
Engler Machine Anti Stumble Valve for Sprint Cars to Clean up off Corners

A recent provision from Engler Machine is his stumble valve. 

 It is a normally open bypass valve that closes with pressure. 

Note: Most conventional fuel injection bypass valves are normally closed and open with pressure, such as for a high speed lean-out function.

This alternative is used as an added bypass valve commonly in circle racing with fuel injection.  

That is additional to the main bypass and high speed bypass that are common tuning tools.  

When a yellow flag is out, Sprint cars must chug around the track at a low speed until the race track is cleared for restart. 

 With secondary bypass circuits typically at 40 psi or higher for a surge of fuel out of the corners, 

these circuits flood the engine at lower throttle position, lower speed operating modes such as under a yellow flag.  

A properly set up stumble valve will open under the low speed conditions, keeping the engine from cooling down. 

 When the flag is removed, engine heat remains for good response on the first hit. 

 We thank Tim Engler for details of this provision.