Small Block Chrysler Flat top -6.65cc All 18 deg 4.080 bore, 3.310 stroke, 6.123 rod 9.1 to 1 Comp with 72cc head (CP Bullets BM4050-040)
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|
Make |
Chrysler |
|
Engine Type |
SB Chrysler |
|
Part Number |
BM4050-040 |
|
Bore (in) |
4.08 |
|
Stroke (in) |
3.31 |
|
Rod Length (in) |
6.123 |
|
Comp Height |
1.8 |
|
Head Type |
All 18 deg |
|
Head CC |
72 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-6.65 |
|
Compression Ratio |
9.1 |
|
Pin |
.984 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.280 / -.280 |
|
Cubic Inch |
346 |
|
Piston Weight |
573 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chrysler Flat top -6.65cc All 18 deg 4.080 bore, 3.310 stroke, 6.123 rod 9.1 to 1 Comp with 72cc head (CP Bullets BM4050-040) |
|---|---|
| Brands | CP Carrillo |
| Engine | Chrysler |
| Make | Chrysler |
Delivery & Freight
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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 BM4050-040 pistons?
For the BM4050-040 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, this can vary based on the specific application and operating conditions, so always consult with your engine builder for the best fit.
What is the compression ratio of the BM4050-040 pistons with a 72cc head?
The BM4050-040 pistons provide a compression ratio of 9.1:1 when used with a 72cc cylinder head. Ensure that all components are compatible to achieve this ratio effectively.
What type of ring gaps should I set for the BM4050-040 pistons?
For the BM4050-040 pistons, the recommended ring gaps are typically 0.020" for the top rings and 0.018" for the second rings. However, these values can be adjusted based on your specific engine setup and intended use.
Do the BM4050-040 pistons require any specific machining?
Yes, the BM4050-040 pistons may require specific machining such as honing the bore for proper clearance and ensuring the piston pin bores are correctly sized. Always check with your engine builder for precise requirements.
What is the weight of the BM4050-040 pistons and how does it affect performance?
The BM4050-040 pistons weigh 573 grams. This weight is suitable for performance applications, but keep in mind that lighter pistons can improve engine response and reduce stress on the rotating assembly, so consider your overall build when selecting components.
