How big is the spark plug on an aluminum cylinder head?
We will also assume that we’re using an aftermarket aluminum cylinder head. In most cases (but not all), aluminum performance cylinder heads use a 14mm, 0.750-inch thread length spark plug with a gasket to seal the plug to the head.
Can a coolant leak foul the spark plug?
Modern coolants do not cause this type of buildup quickly due to the reduction of phosphate, zinc and other additives that can contaminate the catalytic converters. Unfortunately, it also means that drivers will run a vehicle with a coolant leak for several thousand miles while the plug becomes slowly fouled.
Which is the hotter spark plug for Autolite?
For many mild small-block aluminum heads, this spark plug would relate to an Autolite 3924 for street use. Within the Autolite family, this particular plug is toward the hotter side of the range that runs (cold-to-hot) 3922 – 3923 – 3924 – 3926.
What should the spark plugs on a motorcycle look like?
Your motorcycle’s spark plugs can be very useful to diagnose running conditions in your engine. You can use the burn color of your plugs and reference the plug color charts below to determine if your engine is running rich or lean. Good running conditions: If everything is good, the spark plug should have a tan/light brown color.
Which is the hottest part of a spark plug?
A longer insulator nose = a hotter plug temp. The insulator tip is the hottest part of the plug and therefore the part that could cause pre-ignition. For a typical 4-cycle engine this takes place at approx. 1750 degrees Fahrenheit The rating of a plug’s heat range or its pre-ignition rating is done by an IMEP test. 1.
What makes a thermocouple plug a spark plug?
A thermocouple plug has a small temp sensitive element (a fused junction of platinum and platinum/10% rhodium) on the end of the insulator tip, being temp. sensitive the voltage at the junction increases as temp. increases and can be correlated to show exact temp. of plug at T.C. position. 3.
Where are spark plugs located on a sprint car?
B) A plug located on the vortex boundary can become so beaded with fuel wet fouling can occur (most common at lower RPM) ex. restart hesitations experienced by methanol fueled sprint cars
What happens when you change the spark plug?
Horsepower/Torque Increase – most changes that increases the power will result in an increase in plug temp. (ex. increasing comp.) Cylinder Head Temp. – insulator tip temps. vary almost directly with cylinder head temp.