Ford 428ci TF5 11R 4.125 Bore 1.280 CH -29.2cc 10.5:1 CR (CP Bullets BF6171-STD)
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|
Make |
Ford |
|
Engine Type |
Small Block |
|
Part Number |
BF6171-STD |
|
Bore (in) |
4.125 |
|
Stroke (in) |
4 |
|
Rod Length (in) |
6.2 |
|
Comp Height |
1.28 |
|
Head Type |
TFS 11R |
|
Head CC |
52.4 |
|
Dome / Dish Height |
-0.195 |
|
Dom/Dish CC |
-29.2 |
|
Compression Ratio |
10.5 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.230 / SP |
|
Cubic Inch |
428 |
|
Piston Weight |
500 |
|
Style |
Dish |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Ford 428ci TF5 11R 4.125 Bore 1.280 CH -29.2cc 10.5:1 CR (CP Bullets BF6171-STD) |
|---|---|
| Brands | CP Carrillo |
| Engine | Ford 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 BF6171-STD pistons?
For the BF6171-STD pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, this can vary based on your specific engine build and intended use, so always consult with your engine builder for precise measurements.
What compression ratio can I expect with the BF6171-STD pistons in my Ford 428ci engine?
The BF6171-STD pistons are designed to achieve a compression ratio of 10.5:1 when used with TFS 11R heads with a 52.4cc chamber. Ensure your entire setup, including head gasket thickness and combustion chamber volume, is accounted for to maintain this ratio.
What type of ring gaps should I set for the BF6171-STD pistons?
For the BF6171-STD pistons, ring gaps should typically be set according to the manufacturer's specifications and your engine's intended use. A common starting point for performance applications is 0.004" per inch of bore for the top ring and slightly more for the second ring, but always verify with your engine builder.
Do the BF6171-STD pistons require any special machining?
Yes, the BF6171-STD pistons may require specific machining such as honing the cylinder bores to achieve the correct clearance. Additionally, ensure that the piston-to-valve clearance is checked, especially with the two valve reliefs designed into the piston.
What is the weight of the BF6171-STD pistons and how does it affect my engine?
The BF6171-STD pistons weigh 500 grams each. This weight can impact your engine's balance and overall performance, particularly at high RPMs. It's crucial to balance the entire rotating assembly to ensure smooth operation and reliability.
