Small Block Chrysler Inv Dish -18cc EQ Magnum 4.040 bore, 3.580 stroke, 6.123 rod 9.1 to 1 Comp with 62cc head (CP Bullets BMR4200-040)
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|
Make |
Chrysler |
|
Engine Type |
SB Chrysler |
|
Part Number |
BMR4200-040 |
|
Bore (in) |
4.04 |
|
Stroke (in) |
3.58 |
|
Rod Length (in) |
6.123 |
|
Comp Height |
1.645 |
|
Head Type |
EQ Magnum |
|
Head CC |
62 |
|
Dome / Dish Height |
-0.117 |
|
Dom/Dish CC |
-18 |
|
Compression Ratio |
9.1 |
|
Pin |
.984 x 2.500 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.250 / -.250 |
|
Cubic Inch |
367 |
|
Piston Weight |
472 |
|
Style |
Inv |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chrysler Inv Dish -18cc EQ Magnum 4.040 bore, 3.580 stroke, 6.123 rod 9.1 to 1 Comp with 62cc head (CP Bullets BMR4200-040) |
|---|---|
| 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 BMR4200-040 pistons?
For the BMR4200-040 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, it's crucial to verify this with your specific engine build and application, as clearances may vary based on factors like material expansion and intended use.
What compression ratio can I expect with the BMR4200-040 pistons in an EQ Magnum head?
The BMR4200-040 pistons provide a compression ratio of 9.1:1 when used with a 62cc EQ Magnum head. Keep in mind that actual compression can vary based on factors like head gasket thickness and combustion chamber modifications.
What is the weight of the BMR4200-040 pistons and how does it affect performance?
The BMR4200-040 pistons weigh 472 grams each. While lighter pistons can improve engine response and reduce reciprocating mass, it's essential to balance them with the rest of the rotating assembly to maintain engine reliability and performance.
Do the BMR4200-040 pistons require specific machining before installation?
Yes, the BMR4200-040 pistons may require specific machining such as honing of the cylinder bores to achieve the correct clearance. Always consult with your engine builder to ensure proper fitment and performance.
What type of rings are compatible with the BMR4200-040 pistons?
The BMR4200-040 pistons are designed to work with 1.2 x 1.2 x 3.0mm ring sets. Ensure that the rings are properly gapped and installed according to your engine's specifications for optimal performance.
