prechambers mods?
prechambers mods?
02-19-2018, 04:32 PM
#132
I am not opposed to advancing the timing if the results are the most positive. Little explanation, drilled the prechamber exit holes in steps,about 2 %
each time until high rpm performance fell off. Test ground,starting at 7,000 ft. 6% grade to about 8,500 ft. Nice long smooth road. Starting at 60 m.p.h.
noting how much time taken to achieve 70 m.p.h. Injectors checked for proper spray and pop pressures. Each increase in hole size netted a small but
noticeable over all performance increase. After 8% hole size increase this happened,engine was louder ,time to reach 70 m.p.h. almost doubled and
a delay in throttle response of 1sec. was noticed. Timing still set at 26 degrees.
More prechambers acquired drilled to max. 8% than tapered. Reassemble, engine very sluggish needed to advance timing to 29 degrees to regain
performance. The engine response not the same. Before a light touch of throttle at any speed,immediate increase in rpm,now a slight delay and
higher rpm a little slower.Did not want to advance more,nailing starting .
IMO this is what is occurring,a temp/pressure/time relation. Slow down the burn rate,increase timing will be needed. Increase the burn rate,decrease
the timing. This can be inside or outside the prechamber. Example,drill the flame tube very much larger,a increase in timing well be needed,a slowing
of the burn rate. How,larger voulmne to a lesser amount ,the fuel rich flame not coming in contact as much with the hot prechamber walls .
Slower temp. rise less pressure rise ,slower flame coming out prechamber,taking more time to travel across cyl. Advance the timing.
On the other hand tapering the burn tube a decrease in timing will be needed,increased velocity to a lesser extant ,pressing more of the fuel rich flame
onto the hot prechamber increases temp/pressure faster,more velocity out exit holes,less time to travel across cyl. raising working pressure.
Timing will needed to be decreased.
Great job on those prechambers 616 . Also thanks for sharing. All here to learn and enjoy.
Bit more info. Timing was at 26 degrees before tapering,after tapering 29 degrees. Thought this might happen. Bubble method used to time.
I am not opposed to advancing the timing if the results are the most positive. Little explanation, drilled the prechamber exit holes in steps,about 2 %
each time until high rpm performance fell off. Test ground,starting at 7,000 ft. 6% grade to about 8,500 ft. Nice long smooth road. Starting at 60 m.p.h.
noting how much time taken to achieve 70 m.p.h. Injectors checked for proper spray and pop pressures. Each increase in hole size netted a small but
noticeable over all performance increase. After 8% hole size increase this happened,engine was louder ,time to reach 70 m.p.h. almost doubled and
a delay in throttle response of 1sec. was noticed. Timing still set at 26 degrees.
More prechambers acquired drilled to max. 8% than tapered. Reassemble, engine very sluggish needed to advance timing to 29 degrees to regain
performance. The engine response not the same. Before a light touch of throttle at any speed,immediate increase in rpm,now a slight delay and
higher rpm a little slower.Did not want to advance more,nailing starting .
IMO this is what is occurring,a temp/pressure/time relation. Slow down the burn rate,increase timing will be needed. Increase the burn rate,decrease
the timing. This can be inside or outside the prechamber. Example,drill the flame tube very much larger,a increase in timing well be needed,a slowing
of the burn rate. How,larger voulmne to a lesser amount ,the fuel rich flame not coming in contact as much with the hot prechamber walls .
Slower temp. rise less pressure rise ,slower flame coming out prechamber,taking more time to travel across cyl. Advance the timing.
On the other hand tapering the burn tube a decrease in timing will be needed,increased velocity to a lesser extant ,pressing more of the fuel rich flame
onto the hot prechamber increases temp/pressure faster,more velocity out exit holes,less time to travel across cyl. raising working pressure.
Timing will needed to be decreased.
Great job on those prechambers 616 . Also thanks for sharing. All here to learn and enjoy.
Messages In This Thread
prechambers mods? - by Tito - 06-01-2014, 04:05 PM
RE: prechambers mods? - by raysorenson - 06-01-2014, 06:37 PM
RE: prechambers mods? - by MFSuper90 - 06-01-2014, 07:30 PM
RE: prechambers mods? - by led-panzer - 06-01-2014, 08:16 PM
RE: prechambers mods? - by MFSuper90 - 06-03-2014, 02:28 PM
RE: prechambers mods? - by led-panzer - 06-03-2014, 08:30 PM
RE: prechambers mods? - by Tito - 06-02-2014, 05:53 AM
RE: prechambers mods? - by Simpler=Better - 06-02-2014, 07:14 AM
RE: prechambers mods? - by raysorenson - 06-02-2014, 08:51 PM
RE: prechambers mods? - by Tito - 06-03-2014, 03:49 PM
RE: prechambers mods? - by MFSuper90 - 06-03-2014, 09:35 PM
RE: prechambers mods? - by sassparilla_kid - 06-03-2014, 10:22 PM
RE: prechambers mods? - by Captain America - 06-03-2014, 10:52 PM
RE: prechambers mods? - by baldur - 06-04-2014, 05:44 AM
RE: prechambers mods? - by Simpler=Better - 06-04-2014, 08:56 AM
RE: prechambers mods? - by sassparilla_kid - 06-04-2014, 09:41 AM
RE: prechambers mods? - by Simpler=Better - 06-04-2014, 11:15 AM
RE: prechambers mods? - by MFSuper90 - 06-04-2014, 03:45 PM
RE: prechambers mods? - by Simpler=Better - 06-05-2014, 07:38 AM
RE: prechambers mods? - by sassparilla_kid - 06-05-2014, 09:07 AM
RE: prechambers mods? - by MFSuper90 - 06-05-2014, 09:23 AM
RE: prechambers mods? - by Duncansport - 06-05-2014, 09:29 AM
RE: prechambers mods? - by MFSuper90 - 06-05-2014, 09:32 AM
RE: prechambers mods? - by Simpler=Better - 06-05-2014, 11:17 AM
RE: prechambers mods? - by OM616 - 06-05-2014, 12:05 PM
RE: prechambers mods? - by Captain America - 06-06-2014, 11:15 PM
RE: prechambers mods? - by sassparilla_kid - 06-05-2014, 02:40 PM
RE: prechambers mods? - by barrote - 06-08-2014, 01:19 PM
RE: prechambers mods? - by Tito - 06-09-2014, 02:33 AM
RE: prechambers mods? - by Tito - 12-06-2014, 07:34 AM
RE: prechambers mods? - by hooblah - 12-06-2014, 12:47 PM
RE: prechambers mods? - by Tito - 12-06-2014, 12:57 PM
RE: prechambers mods? - by EDH_Performance - 12-06-2014, 07:14 PM
RE: prechambers mods? - by barrote - 12-08-2014, 02:14 PM
RE: prechambers mods? - by hooblah - 12-08-2014, 05:13 PM
RE: prechambers mods? - by barrote - 12-09-2014, 09:16 AM
RE: prechambers mods? - by swatmugga - 12-08-2014, 05:59 PM
RE: prechambers mods? - by Tito - 12-09-2014, 03:06 PM
RE: prechambers mods? - by EDH_Performance - 12-08-2014, 07:24 PM
RE: prechambers mods? - by barrote - 12-09-2014, 04:15 PM
RE: prechambers mods? - by Hercules - 12-10-2014, 06:42 PM
RE: prechambers mods? - by Simpler=Better - 12-10-2014, 10:12 PM
RE: prechambers mods? - by Tito - 12-11-2014, 09:22 AM
RE: prechambers mods? - by sassparilla_kid - 12-11-2014, 08:18 PM
RE: prechambers mods? - by raidaru - 12-12-2014, 04:43 AM
RE: prechambers mods? - by Tito - 12-12-2014, 06:57 AM
RE: prechambers mods? - by DiseaselWeasel - 12-12-2014, 10:50 AM
RE: prechambers mods? - by Duncansport - 12-12-2014, 11:26 AM
RE: prechambers mods? - by barrote - 12-12-2014, 03:32 PM
RE: prechambers mods? - by Tito - 12-13-2014, 11:46 AM
RE: prechambers mods? - by barrote - 12-13-2014, 02:37 PM
RE: prechambers mods? - by OM616 - 12-13-2014, 12:28 PM
RE: prechambers mods? - by Petar - 12-13-2014, 03:58 PM
RE: prechambers mods? - by DiseaselWeasel - 12-13-2014, 05:14 PM
RE: prechambers mods? - by starynovy - 12-14-2014, 05:45 AM
RE: prechambers mods? - by Tito - 12-14-2014, 04:43 AM
RE: prechambers mods? - by DiseaselWeasel - 12-14-2014, 07:21 AM
RE: prechambers mods? - by Petar - 12-15-2014, 04:19 AM
RE: prechambers mods? - by barrote - 12-15-2014, 02:34 PM
RE: prechambers mods? - by CRD4x4 - 12-28-2014, 06:17 PM
RE: prechambers mods? - by barrote - 12-30-2014, 05:14 PM
RE: prechambers mods? - by sassparilla_kid - 12-14-2014, 10:40 PM
RE: prechambers mods? - by MFSuper90 - 12-14-2014, 10:59 PM
RE: prechambers mods? - by MTUPower - 12-27-2014, 10:19 PM
RE: prechambers mods? - by Tito - 12-28-2014, 04:43 AM
RE: prechambers mods? - by MTUPower - 01-10-2015, 12:10 AM
RE: prechambers mods? - by MTUPower - 01-12-2015, 01:55 PM
RE: prechambers mods? - by sassparilla_kid - 01-13-2015, 12:09 PM
RE: prechambers mods? - by MTUPower - 01-14-2015, 09:02 AM
RE: prechambers mods? - by MTUPower - 01-14-2015, 06:11 PM
RE: prechambers mods? - by Eric78 - 01-15-2015, 04:21 AM
RE: prechambers mods? - by MTUPower - 01-15-2015, 09:55 AM
RE: prechambers mods? - by Eric78 - 01-16-2015, 07:09 AM
RE: prechambers mods? - by MTUPower - 01-16-2015, 09:24 AM
RE: prechambers mods? - by raysorenson - 01-16-2015, 09:43 AM
RE: prechambers mods? - by barrote - 01-16-2015, 03:22 PM
RE: prechambers mods? - by raidaru - 01-23-2015, 06:12 AM
RE: prechambers mods? - by MTUPower - 01-24-2015, 09:45 AM
RE: prechambers mods? - by led-panzer - 02-02-2015, 12:31 PM
RE: prechambers mods? - by MTUPower - 02-02-2015, 08:04 PM
RE: prechambers mods? - by Sleek~silver602 - 02-02-2015, 08:34 PM
RE: prechambers mods? - by MTUPower - 02-03-2015, 09:44 AM
RE: prechambers mods? - by MTUPower - 02-06-2015, 11:48 PM
RE: prechambers mods? - by led-panzer - 02-07-2015, 09:36 PM
RE: prechambers mods? - by MTUPower - 02-07-2015, 11:44 PM
RE: prechambers mods? - by OM616 - 02-07-2015, 11:57 AM
RE: prechambers mods? - by MTUPower - 02-07-2015, 05:58 PM
RE: prechambers mods? - by raidaru - 02-08-2015, 01:30 PM
RE: prechambers mods? - by DiseaselWeasel - 02-08-2015, 05:25 AM
RE: prechambers mods? - by led-panzer - 02-08-2015, 08:26 AM
RE: prechambers mods? - by MTUPower - 02-08-2015, 09:15 AM
RE: prechambers mods? - by barrote - 02-08-2015, 09:55 AM
RE: prechambers mods? - by MTUPower - 02-08-2015, 07:34 PM
RE: prechambers mods? - by led-panzer - 02-08-2015, 11:08 AM
RE: prechambers mods? - by MTUPower - 02-09-2015, 09:41 PM
RE: prechambers mods? - by MTUPower - 02-10-2015, 05:57 PM
RE: prechambers mods? - by turbojeep - 02-10-2015, 09:26 PM
RE: prechambers mods? - by MTUPower - 02-10-2015, 10:01 PM
RE: prechambers mods? - by barrote - 02-16-2015, 03:12 PM
RE: prechambers mods? - by MTUPower - 02-16-2015, 06:23 PM
RE: prechambers mods? - by barrote - 02-17-2015, 08:06 AM
RE: prechambers mods? - by OM616 - 02-17-2015, 12:35 PM
RE: prechambers mods? - by Captain America - 02-24-2015, 01:35 AM
RE: prechambers mods? - by OM616 - 02-24-2015, 12:34 PM
RE: prechambers mods? - by Captain America - 02-25-2015, 10:07 PM
RE: prechambers mods? - by barrote - 02-17-2015, 02:59 PM
RE: prechambers mods? - by OM616 - 02-17-2015, 06:51 PM
RE: prechambers mods? - by barrote - 02-18-2015, 05:09 AM
RE: prechambers mods? - by barrote - 02-23-2015, 06:27 AM
RE: prechambers mods? - by baldur - 02-24-2015, 06:47 AM
RE: prechambers mods? - by raysorenson - 02-24-2015, 09:13 AM
RE: prechambers mods? - by barrote - 02-24-2015, 04:38 PM
RE: prechambers mods? - by barrote - 02-25-2015, 03:10 PM
RE: prechambers mods? - by raysorenson - 02-25-2015, 07:11 PM
RE: prechambers mods? - by NZScott - 02-26-2015, 02:21 AM
RE: prechambers mods? - by barrote - 02-26-2015, 02:29 PM
RE: prechambers mods? - by OM616 - 02-26-2015, 06:11 PM
RE: prechambers mods? - by NZScott - 02-26-2015, 10:38 PM
RE: prechambers mods? - by OM616 - 02-27-2015, 11:54 AM
RE: prechambers mods? - by barrote - 02-27-2015, 05:37 AM
RE: prechambers mods? - by raysorenson - 02-27-2015, 12:39 PM
RE: prechambers mods? - by Greazzer - 02-27-2015, 01:29 PM
RE: prechambers mods? - by sassparilla_kid - 03-02-2015, 03:11 AM
RE: prechambers mods? - by MFSuper90 - 03-02-2015, 09:58 AM
RE: prechambers mods? - by barrote - 03-21-2015, 09:27 AM
RE: prechambers mods? - by PanicButton - 08-15-2015, 04:48 AM
RE: prechambers mods? - by raysorenson - 08-15-2015, 10:05 PM
RE: prechambers mods? - by MFSuper90 - 08-16-2015, 01:38 AM
RE: prechambers mods? - by MTUPower - 02-18-2018, 11:27 PM
RE: prechambers mods? - by Hercules - 02-19-2018, 06:51 AM
RE: prechambers mods? - by OM616 - 02-19-2018, 12:54 PM
RE: prechambers mods? - by Hercules - 02-19-2018, 04:32 PM
RE: prechambers mods? - by OM616 - 02-19-2018, 07:13 PM
RE: prechambers mods? - by Hercules - 02-19-2018, 08:52 PM
RE: prechambers mods? - by Hercules - 02-19-2018, 09:41 PM
RE: prechambers mods? - by OM616 - 02-20-2018, 01:42 AM
Users browsing this thread:
7 Guest(s)
7 Guest(s)
Users browsing this thread:
7 Guest(s)
7 Guest(s)