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)
Small Block Chrysler Flat top -6.65cc All 18 deg 4.080 bore, 3.310 stroke, 6.123 rod 9.1 to 1 Comp with 72cc head (CP Bullets BM4050-040)
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)
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|
Make |
Chrysler |
|
Engine Type |
SB Chrysler |
|
Part Number |
BMR4220-040 |
|
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 |
FT |
|
Dom/Dish CC |
-5.46 |
|
Compression Ratio |
12.1 |
|
Pin |
.984 x 2.500 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.250 / -.250 |
|
Cubic Inch |
367 |
|
Piston Weight |
475 |
|
Style |
Inv |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | 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) |
|---|---|
| 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 BMR4220-040 pistons?
The BMR4220-040 pistons are designed for a compression ratio of 12.1:1 when used with 62cc EQ Magnum heads. Ensure that your engine's setup, including fuel quality and tuning, can support this compression for optimal performance.
What bore and stroke specifications are compatible with the BMR4220-040 pistons?
These pistons are designed for a 4.040-inch bore and a 3.580-inch stroke, making them suitable for a small block Chrysler engine with those specific dimensions.
What is the piston weight of the BMR4220-040 and how does it affect performance?
The BMR4220-040 pistons weigh 475 grams each. Lighter pistons can improve engine response and reduce reciprocating mass, but ensure that your engine is balanced appropriately to maintain reliability at higher RPMs.
What type of valve reliefs do the BMR4220-040 pistons have?
The BMR4220-040 pistons feature two valve reliefs, which are designed to accommodate the valve train of small block Chrysler engines. Ensure proper clearance during assembly to avoid interference.
What is the recommended installation procedure for the BMR4220-040 pistons?
When installing the BMR4220-040 pistons, ensure that the correct bore clearance is set and that the ring gaps are properly adjusted. Follow the manufacturer's guidelines for piston pin installation and ensure the connecting rods are correctly aligned.
