Post throttle vs Pre throttle

[Richard L]

This will depend on what type of system you have. Does you system have a solenoid valve to stop the flow instantly rather continue to dribble until the line pressure drop down to zero differetial.

If you run high percentage of methanol on your system, the residual spray (dribble) and cause pre-ignition problems on a few cylinders and methanol can ignite during the valve overlap period.

A check valve is a definate no no for post throttle applications.

[5mall5nail5]

Originally Posted by Richard L

This will depend on what type of system you have. Does you system have a solenoid valve to stop the flow instantly rather continue to dribble until the line pressure drop down to zero differetial.

If you run high percentage of methanol on your system, the residual spray (dribble) and cause pre-ignition problems on a few cylinders and methanol can ignite during the valve overlap period.

A check valve is a definate no no for post throttle applications.

Richard I just found this post of yours - a check valve is a defanate no no. Is that necessarily true? I just ordered 4mm check valves from Howerton for my direct port setup.

Thanks,
Jon