So.. I am trying to get my car running but now it has really bad detonation coming from the passenger side and it wont stay running I have to use the throttle to keep it running. Also, I have the timing set at 10 degrees. I can't for the life of me figure this out. I just installed a AFM B-41 cam, AFR 185 heads, RPM II intake, 30lb injectors, 75mm T/B, 4" power pipe, and a PMAS mass air calibrated. If you have any ideas or things for me to check for let me know. Thanks
Detonation problems. HELP!!
- Thread starter matador91
- Start date
ID89GT
10 Year Member
Possible vacuum leak? Idk.
I see your from Bothel, Is that the Bothel by Seattle WA or somewhere else?
I see your from Bothel, Is that the Bothel by Seattle WA or somewhere else?
94Blue302GT
Member
Check plugs and wires first.
The plugs can give you an indication as to what's happening.
Also, does your exhaust smoke a bit?
You can also try swapping out your dizzy, they seem to go out from time to time and can reek havoc on your motor. Plus, with the cam swap, it might be a tooth off, which could lead to crazy timing, even if you think you're set at 10*
The plugs can give you an indication as to what's happening.
Also, does your exhaust smoke a bit?
You can also try swapping out your dizzy, they seem to go out from time to time and can reek havoc on your motor. Plus, with the cam swap, it might be a tooth off, which could lead to crazy timing, even if you think you're set at 10*
Pinging or spark knock is not the same as detonation.
Pinging is preignition of the fuel air charge by some source of ignition other than the spark plug. The source of the ignition can be a hot spot in the combustion chamber such as carbon, a spark plug insulator, side electrode, or a sharp edge on a valve. It occurs before the spark plug can fire and while the piston is still on its upward movement towards TDC. That is the cause of the characteristic ping or ringing sound, much like shaking a coffee can full of BB’s.
Detonation is the uncontrolled explosion of the fuel air charge after the spark plug fires and starts to burn. In a properly running engine, the spark plug ignites the fuel air charge and it burns slowly and evenly across the combustion chamber, much like a fire as it burns its way across a grassy field. When detonation occurs, the ignited fuel air charge causes an increase in the combustion chamber pressure and temperature. The remaining fuel air charge that has not been burned self–ignites explosively causing tremendous heat and pressure. The source of secondary ignition can be the same as preignition, or can be simply due to the heat and pressure. Detonation is what damages engine parts because of the excessive heat and pressure.
Pinging can lead to detonation, and the results are the same: engine damage because of the excessive heat and pressure
So now that you know that there is a difference, what do you have?
Pinging is preignition of the fuel air charge by some source of ignition other than the spark plug. The source of the ignition can be a hot spot in the combustion chamber such as carbon, a spark plug insulator, side electrode, or a sharp edge on a valve. It occurs before the spark plug can fire and while the piston is still on its upward movement towards TDC. That is the cause of the characteristic ping or ringing sound, much like shaking a coffee can full of BB’s.
Detonation is the uncontrolled explosion of the fuel air charge after the spark plug fires and starts to burn. In a properly running engine, the spark plug ignites the fuel air charge and it burns slowly and evenly across the combustion chamber, much like a fire as it burns its way across a grassy field. When detonation occurs, the ignited fuel air charge causes an increase in the combustion chamber pressure and temperature. The remaining fuel air charge that has not been burned self–ignites explosively causing tremendous heat and pressure. The source of secondary ignition can be the same as preignition, or can be simply due to the heat and pressure. Detonation is what damages engine parts because of the excessive heat and pressure.
Pinging can lead to detonation, and the results are the same: engine damage because of the excessive heat and pressure
So now that you know that there is a difference, what do you have?
roworld
Member
You asked if his car smokes alittle. I resently installed a bbk ssi intake and im having probems ywith the car breaking up. I checked for vac leaks, change the distributor, and plug wires. This weekend ill change the plugs.
CDQICKGT
New Member
Im not sure what the lift is on that cam but, did you check for proper PTV clearance. Just another possibiliy.
