Re: Power valve.
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Re: Power valve.



My 2 cents (and there are fellas way smarter than me in this group):

- Get the right power valve, but as a baseline I would go with 5.5 not 6.5
- Get the AF adjusted properly if you admittedly haven't; it is possible it is running rich at idle and loading up, which could be contributing
- You didn't mention anything about timing advance ... to me this is part of the overall equation...

Thanks,

Jim

On Tuesday, June 27, 2017 at 2:24:46 AM UTC-4, MO wrote:
I  am trying to figger out a stumble in my Holley 4250 with mechanical secondaries--750 CFM.  Low gear, rolling at idle, punch the throttle and get a substantial hesitation--not really a bog.  about 1500 RPM at full throttle it takes off like a striped a**ed ape!.  I think I have plenty of accelerator pump now.  I put a 2.5 power valve in  because I thought I had low vacume ..my bad.  I put the vac gauge on and actually have 12.5  inches at idle.  Do I just put a 6.5 power valve in, or is there a better way to know which PV  I should use?  BTW  the engine idles fine, but I have not fine tuned the idle mixture yet. .............................MO

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