Small Block Chevy USMTS dome +8cc ASCS Head 4.165 Bore, 3.875 stroke, 6.000 rod 14.1 to 1 comp with a 64cc head - Lefts & Rights (CP Bullets BCR1220-040)
Small Block Chrysler Flat Top -5.46cc EQ Magnum 4.040 bore, 3.580 stroke, 6.123 rod 12.1 to 1 Comp with 62cc head (CP Bullets BMR4220-040)
Small Block Chrysler EQ Magnum 4.020 bore, 3.580 stroke, 6.123 rod , 1.645 CH Inv Dish -18cc 9.0 to 1 Com 1.2mm, 1.2mm, 3mm rings (CP Bullets BMR4200-020)
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|
Make |
Chrysler |
|
Engine Type |
SB Chrysler |
|
Part Number |
BMR4200-020 |
|
Bore (in) |
4.02 |
|
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 |
364 |
|
Piston Weight |
472 |
|
Style |
Inv |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chrysler EQ Magnum 4.020 bore, 3.580 stroke, 6.123 rod , 1.645 CH Inv Dish -18cc 9.0 to 1 Com 1.2mm, 1.2mm, 3mm rings (CP Bullets BMR4200-020) |
|---|---|
| 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 BMR4200-020 pistons?
The BMR4200-020 pistons are designed to achieve a compression ratio of approximately 9.1:1 when used with EQ Magnum heads that have a 62cc combustion chamber. Ensure that your engine's specific configuration aligns with this to optimise performance.
What are the specific machining requirements for installing the BMR4200-020 pistons?
When installing the BMR4200-020 pistons, it is crucial to ensure the bore clearance is set correctly according to the engine builder's specifications. Additionally, the ring gaps must be tailored to the intended use of the engine, taking into account factors such as RPM and boost levels.
What is the weight of the BMR4200-020 pistons, and how does it affect engine performance?
The BMR4200-020 pistons weigh 472 grams each. While this weight is suitable for a performance application, it's important to consider the overall rotating assembly balance to minimise vibrations and ensure reliability at higher RPMs.
Are there any specific considerations for the valve reliefs on the BMR4200-020 pistons?
The BMR4200-020 pistons feature two valve reliefs, which are designed to accommodate typical valve sizes in SB Chrysler engines. It's essential to verify that your specific camshaft and valve train setup will not interfere with the reliefs to prevent potential damage.
What type of rings are included with the BMR4200-020 pistons, and what should I know about their installation?
The BMR4200-020 pistons come with 1.2mm x 1.2mm x 3.0mm rings. When installing these rings, ensure that they are properly gapped and that the ring installation follows the manufacturer's guidelines to prevent issues such as oil consumption or blow-by.
