Pre ignition/ detonation

[old guys rule]

Anyone out there had a problem with ping while using an Edelbrock sp2p intake manifold?

 

[turbine68rt]

Do you have higher than a 9.0:1 CR? I understand those weren't exactly the most performance oriented intakes.

 

[66Satellite47]

Lots of causes for ping, usually wrong timing or just bad gas.
Sp2p didn't last long on the market since they didn't perform.

 

[R413]

Lean will ping. Is there any indication that an engine might be lean using that intake. LOL What a piece of **** intake. I can’t believe they made and sold those.

You would need a small block with a small cam to even have a chance.

Do you remember the 1979 gas crunch where you could only buy 5-10 gallons of gas at a time. My dad would lean out the jetting to save fuel, and then retard the timing to get rid of the ping. So then his car was a total dog, no power and always running hot.

 

[moes]

I agree with R413 the SP2P is a gas crunch intake designed for more mileage, not performance. The ports are very small and restrictive and that can cause a super lean cylinder (ping). It is probably good to about 4500 rpm and then your all done!!!

 

[R413]

I agree with R413 the SP2P is a gas crunch intake designed for more mileage, not performance. The ports are very small and restrictive and that can cause a super lean cylinder (ping). It is probably good to about 4500 rpm and then your all done!!!

Maybe 2500 RPM. LOL

flat land and part throttle below 35 mph.

 

[WileE]

First things first... remove that intake manifold & drop it into your nearest metal recycling container. Substitute with a suitable manifold that performs to your requirements.

 

[Jonas Nordstrom]

And dont get the regular Eddy performer instead...they are related.

 

[Orig69]

Check for vacuum leaks.

 

[mgoblue9798]

Anyone out there had a problem with ping while using an Edelbrock sp2p intake manifold?

I just bought one to put on a 440 in my motor home. Idea is better gas mileage. If it causes and problems it will come off in short order, but I am going to test it for myself with my combo to see what it will do.

 

[RJRENTON]

Anyone out there had a problem with ping while using an Edelbrock sp2p intake manifold?

IMO.....Your thread title is misleading. Pre ignition and detonation are entirely different problems. Pre-ignition is caused by "glowing" or incandescent carbon particles igniting the fuel charge ahead of the spark at the spark plug electrodes. Detonation is caused by the advancing flame front, originated by the spark plug, travelling across the combustion chamber. Opposite the advancing flame front, the remaining fuel charge is being compressed, to the point of auto-ignition (like a Diesel engine), due to low octane fuel, not being able to withstand the increasing pressure, spontaneously ignites, travelling across the face of the combustion chamber. When the two flame fronts collide, the resulting shock wave results in the sound you hear, subjecting the piston to tremendous additional pressures, both in thrust load and crown and ring land pressure loads and extremely high temp loads. High operating temps also contribute to the possibility of detonation. Continued detonation usually results in melted spark plug electrodes followed by holes in the pistons. People often say the noise (pinging sound) they hear, are the valves rattling....incorrect... as at the instant of combustion, both valves are closed. Detonation is the most damaging condition. Most of the time, correct-able with proper ignition advance, correct fuel mixture ratio and distribution uniformity and octane levels to prevent detonation in the first place. Pre-ignition and detonation are the result of issues not the cause, a classic example of the cause-effect principle. Just my opinion of course....
BOB RENTON

 

[383man]

IMO.....Your thread title is misleading. Pre ignition and detonation are entirely different problems. Pre-ignition is caused by "glowing" or incandescent carbon particles igniting the fuel charge ahead of the spark at the spark plug electrodes. Detonation is caused by the advancing flame front, originated by the spark plug, travelling across the combustion chamber. Opposite the advancing flame front, the remaining fuel charge is being compressed, to the point of auto-ignition (like a Diesel engine), due to low octane fuel, not gring able to withstand the increasing pressure, spontaneously ignites, travelling across the face of the combustion chamber. When the two flame fronts collide, the resulting shock wave results in the sound you hear, subjecting the piston to tremendous additional pressures, both in thrust load and crown and ring land pressure loads and extremely high temp loads. High operating temps also contribute to the possibility of detonation. Continued detonation usually results in melted spark plug electrodes followed by holes in the pistons. People often say the noise (pinging sound) they hear, are the valves rattling....incorrect... as at the instant of combustion, both valves are closed. Detonation is the most damaging condition. Most of the time, correct-able with proper ignition advance, correct fuel mixture ratio and distribution uniformity and octane levels to prevent detonation in the first place. Pre-ignition and detonation are the result of issues not the cause, a classic example of the cause-effect principle. Just my opinion of course....
BOB RENTON

Well said. Ron