SB Chrysler 418ci Stock/Edel/Indy Bore 4.080 CH 1.455 Stroke 4.00 Rod 6.123 CR 9.6 Inverted Dome Head 68 (CP Bullets BM4240-080)
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|
Make |
Chrysler |
|
Engine Type |
SB Chrysler |
|
Part Number |
BM4240-080 |
|
Bore (in) |
4.08 |
|
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 |
9.6 |
|
Pin |
.984 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.295 / -.295 |
|
Cubic Inch |
418 |
|
Piston Weight |
467 |
|
Style |
Inv |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | SB Chrysler 418ci Stock/Edel/Indy Bore 4.080 CH 1.455 Stroke 4.00 Rod 6.123 CR 9.6 Inverted Dome Head 68 (CP Bullets BM4240-080) |
|---|---|
| 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 BM4240-080 pistons?
For the BM4240-080 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, final clearance should be determined based on your specific engine build and intended use.
What is the compression ratio of the BM4240-080 pistons, and how does it affect performance?
The BM4240-080 pistons have a compression ratio of 9.6:1. This ratio is suitable for a balance of performance and reliability, but optimal results depend on tuning, fuel quality, and boost levels if applicable.
What type of ring gaps should I set for the BM4240-080 pistons?
Ring gaps for the BM4240-080 pistons should be set according to the specific application and intended use. A common starting point is 0.004" for the top ring and 0.0035" for the second ring, but adjustments may be necessary based on your engine's operating conditions.
What is the weight of the BM4240-080 pistons, and how does it impact engine performance?
The BM4240-080 pistons weigh 467 grams. While lighter pistons can improve throttle response and reduce inertia, it's essential to balance them with the rest of the rotating assembly to maintain engine reliability.
What type of valve reliefs are included with the BM4240-080 pistons?
The BM4240-080 pistons feature two valve reliefs designed for compatibility with 18-degree cylinder heads. Ensure that your valve train setup does not interfere with these reliefs to prevent potential damage.
