Author Topic: low speed pinging  (Read 549 times)

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fryedaddy

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low speed pinging
« on: July 14, 2018, 11:56:56 AM »
what is the cause and cure of low speed pinging,say from 1500-2500 rpm range?

blykins

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Re: low speed pinging
« Reply #1 on: July 14, 2018, 12:00:18 PM »
How much timing and how quickly is it coming in?
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fryedaddy

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Re: low speed pinging
« Reply #2 on: July 14, 2018, 12:20:45 PM »
14-15 int and 33 total with msd pro billet with 1 lite spring and 1 med spring,running 93 no ethanol.
« Last Edit: July 14, 2018, 12:32:07 PM by fryedaddy »

fryedaddy

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Re: low speed pinging
« Reply #3 on: July 14, 2018, 12:58:35 PM »
im not 100% sure its pinging its open headers,it could be just a vib at low speed

shady

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Re: low speed pinging
« Reply #4 on: July 14, 2018, 01:08:14 PM »
is it pinning under an accelerating load or at a steady cruise?
What goes fast doesn't go fast long'
What goes fast takes your money with it.
So I'm slow & broke, what went wrong?

fryedaddy

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Re: low speed pinging
« Reply #5 on: July 14, 2018, 03:07:45 PM »
just when im pulling out slow,no heavy load

TorinoBP88

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Re: low speed pinging
« Reply #6 on: July 14, 2018, 06:09:09 PM »
Change the light spring to a heavy one.  Check if there is any loosenes inthe spring arm. Consider bending arm out slightly to tighten spring.

Make sure transfer ports in metering block are not too  lean. Make sure there is not any vacuum leaks.

fryedaddy

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Re: low speed pinging
« Reply #7 on: July 14, 2018, 09:36:48 PM »
Change the light spring to a heavy one.  Check if there is any loosenes inthe spring arm. Consider bending arm out slightly to tighten spring.

Make sure transfer ports in metering block are not too  lean. Make sure there is not any vacuum leaks.
thanks,thats some stuff i can try.i might go up a couple sizes on my primary jets since im running open headers and no breather and see what that does.im just a seat of the pants driver with very few special tools so anything i change i will have to go for a ride to see if it helps

Falcon67

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Re: low speed pinging
« Reply #8 on: July 18, 2018, 09:53:28 AM »
Check your headers and gaskets.  Had what sounded like a "tap" at idle that sounded for all the world like valve train noise.  Turned out to be fancy carbon fiber header gaskets leaking under the ports. 

e philpott

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Re: low speed pinging
« Reply #9 on: July 18, 2018, 10:59:06 AM »
Do you have the Vacuum advance hooked up ??... I would imagine its hard to hear the Pinging with open headers too

fryedaddy

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Re: low speed pinging
« Reply #10 on: July 18, 2018, 01:57:46 PM »
no vav advance.could it need better gas.it has speed pro forged alu pistons.i think 10.6-10.7 and i dont know how much the block was decked.my uncle had my engine done for me at the machine shop and he would not let me see the receipt because he did it as a gift and didn't tell me how much he spent,but the receipt was about 2 or 3 feet long.the reason i think it might need better gas is i usually mix 110 with my 93 and here lately i haven't put any 110 in it.
« Last Edit: July 19, 2018, 11:19:22 AM by fryedaddy »