Mabey I’m learning,,
07-24-2018 | 11:31 PM
#42
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Joined: Jul 2004
Posts: 11,332
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From: chicago
Textbook max power on gasoline is 12.5:1 . 10% ethanol is like 12.2 if i recall. Not sure why he would recommend 13. Blower motors like to be a bit richer, esp with a single carb on a 250 blower. Your afr is gonna be an average of 4 cylinders. If youre seeing 13.0, its likely gonna be much leaner on the front cylinders, like possibly 14:1 or higher. Even OEM fuel injected engines with sophisticated knock control dont run that lean at wot. Id be shooting for mid 11's on that setup, maybe even richer.
07-25-2018 | 05:05 AM
#44
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From: Toledo
What do you think about running the carbs sideways? I read a thread where someone had 500 hours on a similar set up , with the carbs sideways. Also said they ran the jet two size’s larger over the number 7 piston.
07-25-2018 | 06:45 AM
#45
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From: chicago
07-25-2018 | 02:45 PM
#48
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From: Toledo
Still wondering about the NGK #7 spark plugs. That is what came in the enigne’s from the previous owner. They were very black, almost fuzzy with soot. very rich at some point, then he detonated the port enigne, rebuilt it, let it sit four years, and sold it to me.
07-26-2018 | 09:51 AM
#49
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From: Lake Winnebago
#7 is likely a good starting point once the tune is sorted out.....they are likely a fuzz cold depending on many things.
Lots of ways to skin a cat on you ignition. Figure out what features you want/need/might use in the future...what you have currently.....what you might be able to pick up used....set your budget....pick accordingly.
Personally, I would do a megasquirt CNP igntion only set up before I spent the money (megasquirt option could be less depending on how resourceful you are) on the Daytona Ignition. But it does require more work, homework and set up then the Daytona at the benefit of further expansion capability and control. What might be right for me....might not be right for you.
Lots of ways to skin a cat on you ignition. Figure out what features you want/need/might use in the future...what you have currently.....what you might be able to pick up used....set your budget....pick accordingly.
Personally, I would do a megasquirt CNP igntion only set up before I spent the money (megasquirt option could be less depending on how resourceful you are) on the Daytona Ignition. But it does require more work, homework and set up then the Daytona at the benefit of further expansion capability and control. What might be right for me....might not be right for you.
Last edited by SS496; 07-26-2018 at 09:55 AM.
