Thread: stage 1 v8 crankcase breathers

at the aeclrf meet my fellow v8 drivers may recall me asking around about what may be causing my v8 to be difficult to start when hot. now after having more of a poke around i have found somewhere to go with this that is a lil curious.

after much poking around trying to eliminate everything else before sending it back to the place that tuned the carbies recently (which i sent it to them to fix this issue) i have found that the vehicle starts perfectly when the 2 crankcase breather pipes from the rocker covers are disconnected and just let vent to air.

what i suspect has been happening is when i 1st hit the starter hot, it fires a lil bit then doesnt fire for much cranking, then, after a while with full throttle fires up. the 1st few power strokes are enough to generate some blowby into the crankcase which get drawn into the carby, over richening the mixture. the over rich mixture doesnt matter when cold.

the rest of my crankcase ventilation is good, new flame traps, the breather at the back of engine is clear and working. i do not have the charcoal canister installed and the 2 vent pipes from carbies which are supposed to connect into it just go straight to the fuel tank breather. but disconnecting/blocking these has no effect.

anyone have any thoughts on what to do? all i have thought of so far is to put PCV valves in place of the flame traps, but this wasnt original so shouldnt be needed?

check your ballast resistor bypass wire (which comes from starter soleniod)... white with purple stripe if i remember correctly. but yer if setup right the strombergs should start very relyably