Ford 5.0L Gen 1 & 2 4V Coyote 3.630 Bore, 5.932 rod, 1.165 CH -6.40cc Dish 9.5 CR (CP Bullets BF9871-STD)
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|
Make |
Ford |
|
Engine Type |
Coyote 2011 4 Valve |
|
Part Number |
BF9871-STD |
|
Bore (in) |
3.631 |
|
Stroke (in) |
3.65 |
|
Rod Length (in) |
5.933 |
|
Comp Height |
1.166 |
|
Head Type |
4V Coyote |
|
Head CC |
57 |
|
Dome / Dish Height |
TBD |
|
Dom/Dish CC |
TBD |
|
Compression Ratio |
TBD |
|
Pin |
.866 x 2.500 |
|
Ring Thickness |
1.2 x 1.2 x 2.5mm |
|
VR Depth |
-.125 / -.100 |
|
Cubic Inch |
302 |
|
Piston Weight |
385 |
|
Style |
Dish |
|
Valve Reliefs |
4 VR's |
|
Gas Port |
No |
| Product Name | Ford 5.0L Gen 1 & 2 4V Coyote 3.630 Bore, 5.932 rod, 1.165 CH -6.40cc Dish 9.5 CR (CP Bullets BF9871-STD) |
|---|---|
| Brands | CP Carrillo |
| Engine | Coyote 5.0L V8 |
| Make | Ford |
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What information do I need to match these pistons to my engine?
You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.
How should ring gaps be set for these pistons?
Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.
Are forged pistons suitable for street engines?
Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.
What is the recommended bore clearance for the BF9871-STD pistons?
For the BF9871-STD pistons designed for the Ford 5.0L Coyote engine, a typical bore clearance is around 0.0020" to 0.0025". However, always confirm with your engine builder as specific clearances may vary based on the application and machining tolerances.
What compression ratio can I expect with the BF9871-STD pistons?
The BF9871-STD pistons are designed to achieve a compression ratio of approximately 9.5:1 when used with the specified 57cc Coyote cylinder heads. Ensure that all components are correctly matched and machined for optimal performance.
What type of ring gaps should I set for the BF9871-STD pistons?
For the BF9871-STD pistons, the ring gaps should be set according to the intended use of the engine. Typically, a gap of 0.020" for the top rings and 0.022" for the second rings is a good starting point, but always consult with your engine builder for specific recommendations based on your setup.
Do the BF9871-STD pistons require any specific machining?
Yes, the BF9871-STD pistons may require specific machining such as honing of the cylinder bores to achieve the correct clearance. Additionally, ensure that the piston pin bores are checked for proper fitment and that the piston-to-head clearance is adequate, especially with the valve reliefs.
What is the weight of the BF9871-STD pistons, and how does it affect performance?
The BF9871-STD pistons weigh 385 grams each. While this weight is suitable for performance applications, lighter pistons can improve engine response and reduce reciprocating mass. However, always consider the balance of the entire rotating assembly for optimal performance.
