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930s rule the wasteland
Join Date: Dec 2006
Location: Spotsylvania ,Virginia
Posts: 1,219
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Reversed firing order
Can this be done on a boxer motor, or do 911 builders do this ? I was taking to a v8 builder and he said you can get the cams ground to reverse the firing order so it will fire from the middle to the outside cyls and it creates balance and some serious HP. Just trying to get enlightend.
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1980 930 Turbo 1993 Corrado 1983 944 1984 944 2001 VW golf TDI |
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04-03-2008, 06:19 PM
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Macht Schnell
Join Date: Jun 2003
Location: PSL, FL
Posts: 861
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Quote:
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT |
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04-03-2008, 08:23 PM
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Max Sluiter
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I think that the conventional firing order for a flat 6 is as balanced as a street motor can be. It is balanced better than any other configuration so I do not think that a change in firing order would help much because there is no problem to eliminate.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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04-03-2008, 09:16 PM
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Skunk works
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It is common for MOTOGP engineers to play with firing order...you'll know doubt have heard of "big bang" engines.
Doesnt produce more power but rather changes the power & torque characteristics http://www.motorcycledaily.com/08april05_bigbang.htm
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964 RS-4 |
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04-03-2008, 10:12 PM
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Macht Schnell
Join Date: Jun 2003
Location: PSL, FL
Posts: 861
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Straight 6, Flat 6, or in line triple are perfect engines. All are 120 degree cranks. A great read is "The Design and Tuning of Competition Engines". It is EXTREMELY hard to improve on perfection!
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT |
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04-03-2008, 10:13 PM
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Registered
Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 4,184
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Just as a point of interest, the Laverda Jota (a 1000cc triple, originally a UK-only importer-tuned special based on the Laverda 3C) used 180 degree cranks for most of the production run, although Laverda did switch to 120 degree cranks towards the end. Sounded rather special - you could clearly hear the gap in the firing order when it was at cruising RPM, like a 4 with a cylinder missing...
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'77 S with '78 930 power and a few other things. |
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04-04-2008, 12:52 AM
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Macht Schnell
Join Date: Jun 2003
Location: PSL, FL
Posts: 861
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Here's the sound the Laverda makes, I don't have the associated pic of it vibrating like a freakin washing machine!! http://www.thecreeper.net/laverda/jota1000.wav Les
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT Last edited by les_garten; 04-04-2008 at 07:53 AM.. |
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04-04-2008, 06:50 AM
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930s rule the wasteland
Join Date: Dec 2006
Location: Spotsylvania ,Virginia
Posts: 1,219
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Cool cool ,just throwing it out there. Thanks for the a$$ kicking.
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1980 930 Turbo 1993 Corrado 1983 944 1984 944 2001 VW golf TDI |
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04-04-2008, 07:14 AM
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1971 Porsche 911S
Manfred
964 RS-4
