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-   -   Q jet power piston spring (https://classracer.com/classforum/showthread.php?t=88774)

john billups 12-21-2024 03:16 PM

Q jet power piston spring
 
Need a little help with the best spring . I have s spring set with 5 spring different colors and length.
80 g body w / 305 .

My problem is the motor wont idle. It acts like it go's rich and dies. I have vary low vacuum so I'm thinking the power valve is opening at idle and
dumping fuel.
My question is should, I use a tall spring or a short spring or just test till one that works
thanks, John

Danny Ashley 12-21-2024 03:32 PM

Re: Q jet power piston spring
 
It is a street car or racecar?

john billups 12-21-2024 03:39 PM

Re: Q jet power piston spring
 
stocker. w/ stocker cam short lift long duration.

MR DERBY CITY 12-21-2024 06:15 PM

Re: Q jet power piston spring
 
Could possibly be a vacuum leak ?? Has the intake been removed lately ?

outlaw 12-21-2024 07:02 PM

Re: Q jet power piston spring
 
Spring shouldn’t affect idle. Power piston is tied to main circuit not idle circuit if pulling fuel from main circuit at idle throttle blades are to far open.

john billups 12-21-2024 09:55 PM

Re: Q jet power piston spring
 
Checked for vac leak w/ smoke machine.

As for the pistons. I thinking maybe a little pull over .

Well I'll put it back together as it's a backup and work on it next spring.

thanks all who chimed in.

John B645

Danny Ashley 12-22-2024 07:22 AM

Re: Q jet power piston spring
 
PM sent

Terry Cain 12-22-2024 12:34 PM

Re: Q jet power piston spring
 
Put flat edge on top base sitting upside down. Must be good and flat.

Kevin Panzino 12-23-2024 09:09 AM

Re: Q jet power piston spring
 
Get a drinking straw, cut it down to about 4? long. Place it in the vent stack
at abslight angle to catch the power piston/primary metering rod hanger arms. Note the length sticking up. Now start the engine. It should pull the power piston down and the straw with it. If it goes down and stays down
At ?idle? (yes I understand it won?t idle well on its own but you get the idea) then that?s not your problem.
Have you drilled the holes in the primary blades yet?

Kp

monte385 12-23-2024 09:23 PM

Re: Q jet power piston spring
 
Get rid of PP & rods & block the vac. supply, reduce jet size.


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