To Figure Out The Cubic Feet Per Minute Of Each Revolution Of The Blower:CFM of Blower:
Regular twist blowers: Cu in/rev = rotor length X 27.45 High-helix blowers: Cu in/rev = rotor length X 31.53
This page is for basic blower measurements and is not intended for blueprint making or for specifics of any one individual blower.
| Blower Type/Manufacturer | Named Size | C.I.D./Rev (approx) | Style Of Rotor | Center Case/Rotor Length | Center Case Height |
| * | * | * | * | * | * |
| Detroit Diesel "GMC" Straight 71 series | 2-71 | 136 c.i.d./rev | 3 lobe 30º helix Ball/Roller bearing |
4.875 inches |
Non-standard case side inlet |
| Detroit Diesel "GMC" Straight 71 series | 3-71 | 210 c.i.d./rev | 3 lobe 30º helix Ball/Roller bearing |
7.500 inches |
7.500 inches |
| Detroit Diesel "GMC" Straight 71 series | 4-71 | 280 c.i.d./rev | 3 lobe 30º helix Ball/Roller bearing |
10.000 inches |
7.500 inches |
| Detroit Diesel "GMC" Straight 71 series | 6-71 | approx. 353 c.i.d./rev (Small Bore) |
3 lobe 30º helix Ball/Roller bearing |
15.000 inches |
7.500 inches |
| Detroit Diesel "GMC" Straight 71 series | 6-71 | 420 c.i.d./rev (large bore) |
3 lobe 30º helix Ball/Roller bearing |
15.000 inches |
7.500 inches |
| Detroit Diesel "GMC" Straight 71 series (converted 8v71 to aftermarket case) |
8-71 | 448 c.i.d./rev | 3 lobe 30º helix Ball/Ball bearing |
15.900 inches |
7.500 inches |
| * | * | * | * | * | * |
| Detroit Diesel "GMC" "V" 71 series | 6V71 | 338 c.i.d./rev | 3 lobe 30º helix Ball/Roller bearing |
12.000 inches |
7.500 inches |
| Detroit Diesel "GMC" "V" 71 series | 8V71 | 448 c.i.d./rev | 3 lobe 30º helix Ball/Roller bearing |
15.900 inches |
7.500 inches |
| * | * | * | * | * | * |
| Detroit Diesel "GMC" Straight 53 series | 2-53 | 70 c.i.d./rev | 2 lobe straight Friction NON ball bearing |
4.375 inches |
5.750 inches Non-standard case side inlet |
| Detroit Diesel "GMC" Straight 53 series | 3-53 | 104 c.i.d./rev | 2 lobe straight Friction NON ball bearing |
6.500 inches |
5.750 inches |
| Detroit Diesel "GMC" Straight 53 series | 4-53 SHORT BORE | 120 c.i.d./rev | 2 lobe straight Friction NON ball bearing |
7.500 inches |
5.750 inches |
| Detroit Diesel "GMC" Straight 53 series | 4-53 LONG BORE | 139 c.i.d./rev | 2 lobe straight Friction NON ball bearing |
8.700 inches |
5.750 inches |
| * | * | * | * | * | * |
| Detroit Diesel "GMC" "V" 53 series | 6V53 SHORT BORE | 174 c.i.d./rev | 2 lobe straight Friction NON ball bearing |
10.900 inches |
5.750 inches |
| Detroit Diesel "GMC" "V" 53 series | 6V53 LONG BORE | 209 c.i.d./rev | 2 lobe straight Friction NON ball bearing |
13.100 inches |
5.750 inches |
| Detroit Diesel "GMC" "V" 53 series | 8V53 | 330 c.i.d/rev | 3 lobe 30º helix Ball/Roller bearing |
15.000 inches |
6.500 inches |
| * | * | * | * | * | * |
| Eaton | M-45 | 45 c.i.d./rev | 3 lobe 60º helix Ball/Needle bearing |
4.921 inches | Non-standard case rear inlet |
| Eaton | M-62 | 62 c.i.d./rev | 3 lobe 60º helix Ball/Needle bearing |
4.921 inches (taller rotors) | Non-standard case rear inlet |
| Eaton | M-90 | 90 c.i.d./rev | 3 lobe 60º helix Ball/Needle bearing |
5.433 inches | |
| Eaton | M-112 | 112 c.i.d./rev | 3 lobe 60º helix Ball/Needle bearing |
5.386 inches (taller rotors) | Non-standard case rear inlet |
| * | * | * | * | * | * |
| B & M | 144 | 144 c.i.d./rev | 2 lobe straight Ball/Ball bearing |
8.700 inches |
5.750 inches |
| B & M | 174 | 174 c.i.d./rev | 2 lobe straight Ball/Ball bearing |
||
| B & M | 250 | 250 c.i.d./rev | 2 lobe straight Ball/Ball bearing |
||
| * | * | * | * | * | * |
| Weiand/Holley Pro Street 142 | Pro 142 | 142 c.i.d. | 2 lobe straight Ball/Ball bearing |
8.700 inches |
5.750 inches |
| Weiand/Holley Pro Street 144 | Pro 144 | 144 c.i.d./rev | 2 lobe straight w/teflon Ball/Ball bearing |
8.700 inches |
5.750 inches |
| Weiand/Holley Pro Street 174 | Pro 174 | 174 c.i.d./rev | 2 lobe straight w/teflon Ball/Ball bearing |
||
| Weiand/Holley Pro Street 177 | Pro 177 | 177 c.i.d./rev | 2 lobe straight Ball/Ball bearing |
||
| Weiand/Holley Pro Street 250 | Pro 250 | 250 c.i.d./rev | 2 lobe straight w/teflon Ball/Ball bearing |
||
| Weiand/Holley Pro Street 256 | Pro 256 | 256 c.i.d./rev | 2 lobe straight Ball/Ball bearing |
||
| Weiand/Holley 6-71 |
6-71 | 411 c.i.d./rev | 3 lobe 30º helix Ball/Ball bearing |
15.000 inches |
7.500 inches |
| Weiand/Holley 8-71 |
8-71 | 436 c.i.d./rev | 3 lobe 30º helix Ball/Ball bearing |
15.900 inches |
7.500 inches |
| Weiand/Holley 10-71 |
10-71 | 469 c.i.d./rev | 3 lobe 30º helix Ball/Ball bearing |
17.100 inches |
7.500 inches |
| Weiand/Holley 12-71 |
12-71 | 497 c.i.d./rev | 3 lobe 30º helix Ball/Ball bearing |
18.100 inches |
7.500 inches |
| Weiand/Holley 14-71 |
14-71 | 522 c.i.d./rev | 3 lobe 30º helix Ball/Ball bearing |
19.000 inches |
7.500 inches |
| Weiand/Holley 16-71 |
16-71 | 549 c.i.d./rev | 3 lobe 30º helix Ball/Ball bearing |
20.000 inches |
7.500 inches |
| * | * | * | * | * | * |
| Camden | Five Inch | 80 c.i.d./rev | 2 lobe straight w/teflon Ball/Ball bearing |
5.000 inches |
5.500 inches |
| Camden | Seven Inch | 112 c.i.d./rev | 2 lobe straight w/teflon Ball/Ball bearing |
7.000 inches |
5.500 inches |
| Camden | Nine Inch | 144 c.i.d./rev | 2 lobe straight w/teflon Ball/Ball bearing |
9.000 inches |
5.500 inches |
| Camden | Twelve Inch | 192 c.i.d./rev | 2 lobe straight w/teflon Ball/Ball bearing |
12.000 inches |
5.500 inches |
| * | * | * | * | * | * |
| Original S.Co.T Italmeccanica Italian made |
4500cc Same internally |
275 c.i.d./rev boost up to 6psi |
2 lobe straight cast rotor Ball/Ball bearing |
8.700 inches |
7.750 inches |
| Original S.Co.T Italmeccanica Italian made |
4000cc Same internally |
275 c.i.d./rev boost up to 6psi |
2 lobe straight cast rotor Ball/Ball bearing |
8.700 inches |
7.750 inches |
| * | * | * | * | * | * |
| New improved S.Co.T H&H Flatheads Italmeccanica U.S.A. made |
"S.Co.T." Blower | 142 c.i.d./rev boost up to 10+ psi |
2 lobe straight billet rotor Ball/Ball bearing |
8.700 inches |
7.750 inches |
