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Pinging under load

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Old Jun 1, 2015 | 05:31 PM
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Default Pinging under load
Ok I have searched and researched this but am still unsure. I have a freshly broken in top end. 10.1 Pistons alon with an ev27 cam. I get some pinging if I hard throttle on lower rpms. My carb has a 48/185 combo. I just put in a d146 on clip 3 from the top to see if that helps.. I believe it helped some but didn't fix it. I'm thinking a 190 main. Should I just put my stock needle back in with some washers instead of the aftermarket one. Almost forgot timing is spot on
 
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Old Jun 1, 2015 | 05:53 PM
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Pinging is timing.
If you have programmable timing the go to the next curve.
If you don't just retard it a little.
 
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Old Jun 1, 2015 | 06:05 PM
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or install a VOES as that is what it does - stops the motor from pinging

i believe it retards the timing some dont - but advancing the timing will make it ping even more with a motor that is pinging
 
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Old Jun 1, 2015 | 06:06 PM
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Did you check your VOES for proper operation? It should cut timing in low vacuum conditions like when yours is pinging.
 
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Old Jun 1, 2015 | 06:53 PM
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I have not checked my voes. I will do that before I adjust the timing.
 
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Old Jun 1, 2015 | 07:37 PM
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From: la la land jerzey
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Originally Posted by spanky02
I have not checked my voes. I will do that before I adjust the timing.
you can dig out the seal and adjust the voes to give you a quicker drop in timing under open throttle - vacuum gauge and screw driver the higher the number the quicker it drops the timing off - it does come back on at a higher RPM yes
 
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Old Jun 1, 2015 | 08:45 PM
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Originally Posted by spanky02
10.1 Pistons alon with an ev27 cam. I get some pinging if I hard throttle on lower rpms. Almost forgot timing is spot on
IMO the EV27 is a tad small for 10 to 1 compression...may have to modify your VOEs and or back off the timing some to get it not to ping.
 
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Old Jun 1, 2015 | 10:37 PM
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And make sure you're running premium gas.
 
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Old Jun 2, 2015 | 10:17 AM
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Originally Posted by Owtlaw
And make sure you're running premium gas.
We have plenty of gas stations with 93 up here. I'm gonna retard my timing a few degrees tonight and see if that helps.
 
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Old Jun 2, 2015 | 10:28 AM
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Keep us posted....
 
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