BOLLY PIPES ..... SPECIFICATION CHART

EQ = Quiet Pipe (pattern) , FS = Four stroke (EQ type) TOC = similar to EQ more power & noise

P = Power Pipe QP = Quiet Power pipe i.e. for Ducted Fan.

 FS 122
  Pipe type Shape Diameter mm OD Length mm Weight gm Pipe front to baffle Piston face to baffle Header length needed Total system length Usual ground rpm Engine size used
EQ 7000 round 68 755 325 530 750 220 975 7200 65 - 75 cc
EQ Zenoah 62 square 61 640 - - - - - - 50 - 65cc
EQ 5000 round 58 660 260 470 690 220 880 7500 35 - 50 cc
EQ 3002 round 53 655 210 465 620 155 810 7800 25 - 35 cc
EQ 2004-L Rectangular 52 x 44 625 165 470 620 150 775 8,200 20 - 25cc
EQ 2003-S Square 49 x 49 615 165 460 620 160 775 8,200 20 - 25cc
EQ 2002N Rectangular 52 x 44 615 165 460 620 160 775 8200 20 - 25cc
EQ 2000 round 47 590 120 425 585 160 750 8,800 15 - 20 cc
EQ 90 round 44 525 100 370 520 150 675 10200 10 to 15 cc
EQ 63 square 43 x 43 535 120 380 520 150 685 9800 .60 pattern
EQ 62N Rectangular 46 x 37 525 115 360 510 150 675 10200 .60 pattern
EQ 62 round 44 520 115 365 510 150 675 10200 .60 pattern
EQ 60 round 41 510 100 360 505 150 660 10600 .50 - 60 Pat
EQ 45 round 36.5 495 80 340 480 140 635 11400 .38 - 46 Pat
EQ 30 round 33 470 70 325 465 140 610 12000 .19 - 36 Pat
                     
TOC Somenzini round 55 660 210 470 690 220 880 7500 30 to 35 cc
                     
FS 124 Rectangular 38 x 33 445 95 285         FS.120 /.140
Rectangular 38 x 33 375 80 236         .120 FS
FS 90 Rectangular 33 x 28 375 75 220         .90 FS
                     
DF 91B round 46 470 115 310 330     21000 ducted fan
QP 45 DF round 40 460 95           pattern.
                     
P 92 (ducted) round 52 470 85         22000 .90 - .120
P 90 (ducted) round 50 445 60         22000 .65 - .90
P 45 round 41 390 45         22000 .45 / DF
P 42 round 39 340 45         24000 FAI pylon
P 40 round 41 340 40         23000 .40+ racing
P 21 round 35 280 35         27000 .21 pylon

Please Note: Specifications will vary slightly. Where applicable, all Bolly pipes come supplied with the appropriate silicon joiner and cable ties or clamp and cable ties etc.

For many of the ‘P’ type pipes, different header fittings are available for the different engines available. For difficult cowling applications, bent stingers can be produced for the P type pipes.

The 'XP' Versions

The ‘XP’ range has been discontinued, but can be made to special order... for all ‘P’ type pipes.

The ‘XP’ pipes are our ‘P’ pipes with an integral 'After' muffler. By incorporating the 'After' muffler with a ‘P’ pipe, it is much lighter and stronger, with less aerodynamic drag than adding an 'After' muffler to a ‘P’ pipe. This type of pipe very effectively decreases noise levels, especially in marine applications.

See picture on previous page for ‘XP’ types.