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07-20-2013, 11:32 AM
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CC Member
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Join Date: May 2006
Location: Denia / SPAIN,
ESP
Cobra Make, Engine: NAF 289 Blue/White strips
Posts: 188
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Not Ranked
Ignition distributor
Hello from Spain
can this movement or gap on the distributor cause irregular pinging noise?
Rico
Distributer - YouTube
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Rico, NAF 289
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07-20-2013, 12:04 PM
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CC Member
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Join Date: May 2010
Location: Houston,
tx
Cobra Make, Engine: 2004 Kirkham 427 S/C, Shelby 496C.I.
Posts: 322
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That play looks normal, you're moving the mechanism against the mechanical advance springs.
If your engine is pinging, typical issue is is it has too much total ignition advance. What is the initial timing set at? Should be around 10 - 14 degrees of initial timing, with total advance no more than 36 degrees total.
Also the quality of the fuel has a lot to do with the pinging (pre-ignition). If it's a higher compression engine than the quality of fuel you are putting in the car, it will ping.
We have 87 octane regular quality unleaded at the pump and you usually can't go over 9:1 compression.
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07-20-2013, 12:19 PM
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CC Member
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Join Date: May 2009
Location: American Fork,
Ut
Cobra Make, Engine: 66 Cobra
Posts: 930
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Also, take the rotor off by removing those two screws on the top. Make sure both of the springs are connected.
__________________
Wayne
"Everything is alive. If you get angry at a vehicle or the trans, it won't fix until you apologize and say you are sorry." "The vehicle always knows what it is doing and what the cause of it's bad feeling is. If you ask it humbly what the problem is, it will tell you. Then you and it will both be happy."
Gil Younger
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07-20-2013, 03:01 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Quote:
Originally Posted by cobra 53
Hello from Spain
can this movement or gap on the distributor cause irregular pinging noise?
Rico
Distributer - YouTube |
like racer x said that is normal, i watched your other videos about the engine noise, it just sounds like valves may need the lash set.
the cam seems mild but your gauge only shows 12 in vacuum at idle...my seat of the pants says it should be more.....
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Fred B
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07-21-2013, 03:42 AM
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CC Member
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Join Date: May 2006
Location: Denia / SPAIN,
ESP
Cobra Make, Engine: NAF 289 Blue/White strips
Posts: 188
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Not Ranked
Thanks for the replys.
The problem starts with the higher summer temperatures. 91F-94F.
Gasoline 98 OCT (us 93).
Idle 840-880 RPM. Vacum idle 10-11.
Initial timing 12°, total 33°. Blue bushing, 2 blue springs. Mech advance.
Idle AFR 13-14. Driving AFR 13.5-14. LM2 in the car.
Compression 10.0-10.5. Highest is cyl. nr. 6 with -11.0.Water 190F. Oil 180F.
Cam is CompCam 31-760-8 / 288R
Starting the engine is no problem. No chock. No noise until engine heatet up.
The noise appers irregular on the driver side valve bank next to the distributer and the cyl. nr. 6 and 5. You can hear the nois aswel as little high clear note in the sidepipe.
Rico
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Rico, NAF 289
Last edited by cobra 53; 07-21-2013 at 05:17 AM..
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07-21-2013, 05:58 AM
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CC Member
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Join Date: May 2010
Location: Houston,
tx
Cobra Make, Engine: 2004 Kirkham 427 S/C, Shelby 496C.I.
Posts: 322
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You need to reduce the total timing or limit it. Reduce the initial timing to 10 degrees and see if it pings. Do you have an advance timing light to check total timing? My guess is total timing is more than the 33 degrees.
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07-21-2013, 12:44 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Premium fuel.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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07-21-2013, 12:51 PM
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CC Member
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Join Date: May 2010
Location: Houston,
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Cobra Make, Engine: 2004 Kirkham 427 S/C, Shelby 496C.I.
Posts: 322
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Why do you state the compression is higher at 11.0:1- in cylinder #6?
That will cause the pinging when compared to the others at 10.0 -10.5:1
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07-21-2013, 01:44 PM
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CC Member
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Join Date: May 2006
Location: Denia / SPAIN,
ESP
Cobra Make, Engine: NAF 289 Blue/White strips
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Super unleaded 98 Oktane Gasoline is corresponding US Premium
-11.0 compression wil be checkt to morow morning. Aswell the valve lash and ignition timing. Comp Cam says 0.02 inch gap. Cold or warm engine ?
Rico
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Rico, NAF 289
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07-21-2013, 03:00 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Quote:
Originally Posted by cobra 53
Super unleaded 98 Oktane Gasoline is corresponding US Premium
-11.0 compression wil be checkt to morow morning. Aswell the valve lash and ignition timing. Comp Cam says 0.02 inch gap. Cold or warm engine ?
Rico
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usually their lash specs are for warm.....
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Fred B
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