Small Block Chrysler Inv Dish -17.8cc All 18 deg 4.040 bore, 4.000 stroke, 6.123 rod 9.6 to 1 Comp with 68cc head (CP Bullets BM4040-040)
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|
Make |
Chrysler |
|
Engine Type |
SB Chrysler |
|
Part Number |
BM4040-040 |
|
Bore (in) |
4.04 |
|
Stroke (in) |
4 |
|
Rod Length (in) |
6.123 |
|
Comp Height |
1.427 |
|
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 |
410 |
|
Piston Weight |
469 |
|
Style |
Inv |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chrysler Inv Dish -17.8cc All 18 deg 4.040 bore, 4.000 stroke, 6.123 rod 9.6 to 1 Comp with 68cc head (CP Bullets BM4040-040) |
|---|---|
| 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 compression ratio for the BM4040-040 pistons with a 68cc head?
The BM4040-040 pistons are designed to achieve a compression ratio of 9.6:1 when paired with a 68cc cylinder head. Ensure that your engine's specifications align with this setup for optimal performance.
What are the specific machining requirements for the BM4040-040 pistons?
When installing the BM4040-040 pistons, it's crucial to ensure the bore clearance is set correctly. The pistons should be fitted to a 4.040-inch bore, and the ring gaps must be adjusted according to your engine's application and RPM range.
What is the weight of the BM4040-040 pistons, and how does it affect engine balance?
The BM4040-040 pistons weigh 469 grams each. This weight should be considered when balancing the rotating assembly, as it can impact engine dynamics and performance, especially at higher RPMs.
Do the BM4040-040 pistons require any specific pin fitment considerations?
The BM4040-040 pistons use a .984 x 2.500-inch pin. Ensure that the pin fitment is precise, as proper clearance is vital for performance and longevity, particularly under high-load conditions.
What type of valve reliefs are included with the BM4040-040 pistons?
The BM4040-040 pistons feature two valve reliefs. It's important to verify that these reliefs are compatible with your specific cylinder head and camshaft profile to prevent valve-to-piston contact.
