SB Chrysler 408ci Stock/Edel/Indy Bore 4.030 CH 1.455 Stroke 4.000 Rod 6.123 CR 9.5 Inverted Dome Head 68cc (CP Bullets BM4240-030)
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|
Make |
Chrysler |
|
Engine Type |
SB Chrysler |
|
Part Number |
BM4240-030 |
|
Bore (in) |
4.03 |
|
Stroke (in) |
4 |
|
Rod Length (in) |
6.123 |
|
Comp Height |
1.455 |
|
Head Type |
All 18 deg |
|
Head CC |
68 |
|
Dome / Dish Height |
-0.1 |
|
Dom/Dish CC |
-17.8 |
|
Compression Ratio |
9.5 |
|
Pin |
.984 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.295 / -.295 |
|
Cubic Inch |
408 |
|
Piston Weight |
467 |
|
Style |
Inv |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | SB Chrysler 408ci Stock/Edel/Indy Bore 4.030 CH 1.455 Stroke 4.000 Rod 6.123 CR 9.5 Inverted Dome Head 68cc (CP Bullets BM4240-030) |
|---|---|
| Brands | CP Carrillo |
| Engine | Chrysler |
| Make | Chrysler |
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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 BM4240-030 pistons?
For the BM4240-030 pistons, a typical bore clearance of 0.0035" to 0.0045" is recommended. This ensures proper thermal expansion and avoids piston scuffing during operation.
What is the ideal compression ratio for the BM4240-030 pistons in a 408ci Chrysler engine?
The BM4240-030 pistons are designed to achieve a compression ratio of 9.5:1 when paired with 68cc cylinder heads. Ensure that your engine's overall assembly and combustion chamber design support this ratio for optimal performance.
What type of ring gaps should I set for the BM4240-030 pistons?
For the BM4240-030 pistons, it is crucial to set the ring gaps according to the engine's intended use. Generally, a gap of 0.020" for the top rings and 0.022" for the second rings is a good starting point, but always consult your engine builder for specific recommendations based on your setup.
What is the weight of the BM4240-030 pistons and how does it affect performance?
The BM4240-030 pistons weigh 467 grams. This weight can influence engine balance and rev characteristics, so ensure your rotating assembly is balanced accordingly to maintain reliability and performance.
Are there any specific machining requirements for the BM4240-030 pistons?
Yes, the BM4240-030 pistons may require specific machining for proper fitment, including honing of the cylinder bores to achieve the correct clearance. Always verify with your engine builder to ensure all components are compatible and properly machined.
