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UK Luke 72
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oprn
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 Posted: Thu Oct 14, 2021 6:54 am Post subject: Re: Pinging under light load |
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Seems odd. Maybe you are hearing something else, cracked piston, rocker arm loose, end play in the cooling fan/generator, throw out bearing. Something like that?
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UK Luke 72
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VWporscheGT3
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Location: Gardnerville, NV
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| Posted: Thu Oct 14, 2021 7:31 am Post subject: Re: Pinging under light load |
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Luke,
you would think so , but thats not always the case, sometimes the heavier loading quiet things up. but under light load allows things to move... make noise. had a guy recently who broke the 2nd ring land on a piston... under heavy load... sounded normal... under light load or idle.... clanging and banging. |
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UK Luke 72
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evanfrucht
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Joined: July 24, 2016
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Location: Laurel Canyon, CA
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| Posted: Thu Oct 14, 2021 8:13 am Post subject: Re: Pinging under light load |
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Who knows it could be the fuel.
I always use Shell V-Power as well.
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UK Luke 72
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Alstrup
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Joined: July 12, 2007
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Location: Videbaek Denmark
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| Posted: Thu Oct 14, 2021 10:11 am Post subject: Re: Pinging under light load |
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40 on cruise is pushing it, especially on 95 octane. It will most likely not appreciate more than about 30 & 38.
What is your map in the trouble area at 40% throttle?
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fl59bug
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Joined: November 23, 2005
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Location: North Carolina
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| Posted: Thu Oct 14, 2021 10:29 am Post subject: Re: Pinging under light load |
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I can empathize - any carb to manifold or manfold to head vacuum leaks?
I had a 1776 once that ran great at first but then the Dellorto manifolds (or the head joint itself) developed some nasty warpage and due to the lean condition the bug would ping no matter what gas I ran.
Back then I didn't know what the heck a vacuum leak was and never bothered to investigate. Only later did someone find the problem for me.
Good luck and I hope you get it resolved - Ted |
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UK Luke 72
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| Posted: Thu Oct 14, 2021 12:30 pm Post subject: Re: Pinging under light load |
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| Alstrup wrote: |
40 on cruise is pushing it, especially on 95 octane. It will most likely not appreciate more than about 30 & 38.
What is your map in the trouble area at 40% throttle? |
I pulled 5° out. So it was around 37° cruise
Map is 95-97kPa
AFR 13.8
Now I've tweaked the trigger offset and pulled a little more out. Around 30-33 cruise and 26 wot. Yet to be road tested though.
It's currently drinking Jet Ultra which is a 97 octane e5
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Last edited by UK Luke 72 on Thu Oct 14, 2021 1:23 pm; edited 1 time in total |
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UK Luke 72
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| Posted: Thu Oct 14, 2021 12:31 pm Post subject: Re: Pinging under light load |
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| fl59bug wrote: |
I can empathize - any carb to manifold or manfold to head vacuum leaks?
I had a 1776 once that ran great at first but then the Dellorto manifolds (or the head joint itself) developed some nasty warpage and due to the lean condition the bug would ping no matter what gas I ran.
Back then I didn't know what the heck a vacuum leak was and never bothered to investigate. Only later did someone find the problem for me.
Good luck and I hope you get it resolved - Ted |
It's a fair call, and certainly one I shall investigate.
I would expect to see it in the data logs though tbh.
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UK Luke 72
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Alstrup
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Location: Videbaek Denmark
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| Posted: Thu Oct 14, 2021 1:40 pm Post subject: Re: Pinging under light load |
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| UK Luke 72 wrote: |
I pulled 5° out. So it was around 37° cruise
Map is 95-97kPa
AFR 13.8
Now I've tweaked the trigger offset and pulled a little more out. Around 30-33 cruise and 26 wot. Yet to be road tested though.
It's currently drinking Jet Ultra which is a 97 octane e5 |
95-97 Kpa is just about atmospheric pressure. At that point the advance should be 0 and the system running on the base map only, You don´t want the advance to begin to kick in until about 92 Kpa.
No wonder its pinging on less octane.
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UK Luke 72
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Alstrup
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| Posted: Thu Oct 14, 2021 1:55 pm Post subject: Re: Pinging under light load |
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Yes, but what does the system say at WOT? Probably something like 98 Kpa.
While I am no fan of MS the 12x12 ignition map is more than sufficient for a N/A engine, - provided your map sensor has a decent load range.
Also, are you running open or closed loop?
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panel
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| Posted: Thu Oct 14, 2021 2:05 pm Post subject: Re: Pinging under light load |
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Are you adjusting the trigger offset at idle with the timing gun and have the the table fixed at 10° ?
You shouldn't have to keep adjusting it. Have it match what the timing says by adjusting the offset to match the 10° then leave it alone.
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UK Luke 72
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| Posted: Thu Oct 14, 2021 2:30 pm Post subject: Re: Pinging under light load |
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| Alstrup wrote: |
Yes, but what does the system say at WOT? Probably something like 98 Kpa.
While I am no fan of MS the 12x12 ignition map is more than sufficient for a N/A engine, - provided your map sensor has a decent load range.
Also, are you running open or closed loop? |
A bit of both, it's been open all night this time as AFR seems pretty good.
100.2kPa, dropping to 97.3 by the time we hit 6500rpm
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Last edited by UK Luke 72 on Thu Oct 14, 2021 9:15 pm; edited 1 time in total |
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oprn
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| Posted: Thu Oct 14, 2021 2:32 pm Post subject: Re: Pinging under light load |
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I am running 87 octane, 8.4/1, C/R, 31* total and 41* part throttle advance. No pinging anywhere in the load or RPM range. AFR is low 13s at full throttle and mid 15s at cruise.
Something seems odd to me…
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Last edited by oprn on Thu Oct 14, 2021 2:34 pm; edited 1 time in total |
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UK Luke 72
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| Posted: Thu Oct 14, 2021 2:32 pm Post subject: Re: Pinging under light load |
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| panel wrote: |
Are you adjusting the trigger offset at idle with the timing gun and have the the table fixed at 10° ?
You shouldn't have to keep adjusting it. Have it match what the timing says by adjusting the offset to match the 10° then leave it alone. |
I set fixed timing to 0, and then adjusted offset to get tdc bang on. No idea how or why I was a few degrees off but I haven't changed that for years.
So it's been off all this time.
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UK Luke 72
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