wasted spark ignition on ls series engine
06-17-2008, 04:29 PM
#1
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wasted spark ignition on ls series engine can i retrofit a wasted spark ignition to a ls series engine ?
i mean are there allways 2 pistons at tdc at the same time ? (one in exhaust stroke and one in combustion stroke)
the heads were off the engine but i forgot to check that
i'm not really into the v8 engine layout...
thanks, Jeejee
i mean are there allways 2 pistons at tdc at the same time ? (one in exhaust stroke and one in combustion stroke)
the heads were off the engine but i forgot to check that
i'm not really into the v8 engine layout...
thanks, Jeejee
Last edited by jeejee; 06-18-2008 at 04:42 PM.
06-19-2008, 11:53 PM
#6
I would suspect that even with a mild 220/220 114 cam you would run in to a little issue with the intake stroke seeing a fire. 220/220 on a 114 ICL is at 20.5* BTDC with .006" lift and .050" is at 4* ATDC. Move that same small cam to a 112 ICL with 2* advance and your at 24.5* BTDC for your .006" and 0* for .050"
I'm no expert, but I would think you might cause either back firing or some weird burn before even filling the cyl...
I'm no expert, but I would think you might cause either back firing or some weird burn before even filling the cyl...
06-20-2008, 02:00 AM
#7
does the stock setup not us wasted spark??
Chris.
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06-20-2008, 03:40 AM
#8
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the thing is
I allready HAVE an ecu and an engine without ANY electronics / coils
and the ecu can not be upgraded.
so thats why i want to know if someone has used wasted spark before
i dont think the stock engine uses wasted spark because you would NOT need a cam sensor for that, and all the coils seem to have a direct and seperate wire to the stock ecu
(and i know that from an other engine and not mine because i have no coils and stock ecu...)
I allready HAVE an ecu and an engine without ANY electronics / coils
and the ecu can not be upgraded.
so thats why i want to know if someone has used wasted spark before
i dont think the stock engine uses wasted spark because you would NOT need a cam sensor for that, and all the coils seem to have a direct and seperate wire to the stock ecu
(and i know that from an other engine and not mine because i have no coils and stock ecu...)
06-20-2008, 06:20 AM
#9
well motec ECu's run alot of the racing LS engiens out there and they often run wasted spark. might be wroth giving a sponsord engine builder that deals with these type of engines and ECU's a call. someone like Katech??
Cheers
Chris.
Cheers
Chris.
06-24-2008, 12:25 PM
#12
you will be fine, just for your information
take you firing order and split it in half
1843/6572 and now you have your companion cylinders
1-6
8-5
4-7
3-2
one will be on tdc at th top of the compression stroke ready for firing and the other will be on the top of the exhaust stroke.
Ryan
take you firing order and split it in half
1843/6572 and now you have your companion cylinders
1-6
8-5
4-7
3-2
one will be on tdc at th top of the compression stroke ready for firing and the other will be on the top of the exhaust stroke.
Ryan
06-24-2008, 05:35 PM
#13
you will be fine, just for your information
take you firing order and split it in half
1843/6572 and now you have your companion cylinders
1-6
8-5
4-7
3-2
one will be on tdc at th top of the compression stroke ready for firing and the other will be on the top of the exhaust stroke.
Ryan
take you firing order and split it in half
1843/6572 and now you have your companion cylinders
1-6
8-5
4-7
3-2
one will be on tdc at th top of the compression stroke ready for firing and the other will be on the top of the exhaust stroke.
Ryan
06-25-2008, 02:54 PM
#14
i was sure someone would catch that but it doesnt matter what the firing order it all works the same. i am aware of the different firing order but i was just trying to give an example.
06-26-2008, 09:48 PM
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06-27-2008, 02:53 AM
#18
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ha that could well be possible, some time ago i was looking into fitting an m70 (bmw v12 for non bmw affiliated people) in another project car of mine.
because of small v angle, all aluminium, dirt cheap <$1000, and ready for some boost (8.8:1 com ratio), so i was looking at all kinds of bmw sites for more info / pics on the M70 engine, and might have come across this picture
you want me to remove it ?
because of small v angle, all aluminium, dirt cheap <$1000, and ready for some boost (8.8:1 com ratio), so i was looking at all kinds of bmw sites for more info / pics on the M70 engine, and might have come across this picture
you want me to remove it ?
06-27-2008, 02:30 PM
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ha that could well be possible, some time ago i was looking into fitting an m70 (bmw v12 for non bmw affiliated people) in another project car of mine.
because of small v angle, all aluminium, dirt cheap <$1000, and ready for some boost (8.8:1 com ratio), so i was looking at all kinds of bmw sites for more info / pics on the M70 engine, and might have come across this picture
you want me to remove it ?
because of small v angle, all aluminium, dirt cheap <$1000, and ready for some boost (8.8:1 com ratio), so i was looking at all kinds of bmw sites for more info / pics on the M70 engine, and might have come across this picture
you want me to remove it ?
(Love the LSX) motors, wish we could have as much fun as you guys!)
FYI... that's the M73 5.4l V12 in a 750iL converted to a 6-speed manual. Details on the project: [ CLICK HERE ] and more pics of the driveshaft destruction: [ CLICK HERE ]
