604ci build. Ready run msd or ignition box?
03-22-2017 | 12:56 AM
#81
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From: Traverse City MI
im not done yet. Engine builder is busy so we pulled mine off so he can get 2 more engines dynoed and another engine built. Should've bought profiler intakes, pulling dart intake off and head porter is going remove/rework the cloverleaf intake. Best pull was 840hp torque like a diesel. See if I can scrub another 25 out of it. New power is a drug addiction! I'm pretty confident 93/95. Would like to see click or two under century mark. Give some of my cig friends a run for there money
I like those sniper intakes! What about a tunnel ram?
Maybe try a larger carb also
05-14-2017 | 09:48 PM
#82
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From: Tulsa oklahoma
[ATTACH=CONFIG]567423[/ATTACH][ATTACH=CONFIG]567424[/ATTACH][ATTACH=CONFIG]567425[/ATTACH]
im not done yet. Engine builder is busy so we pulled mine off so he can get 2 more engines dynoed and another engine built. Should've bought profiler intakes, pulling dart intake off and head porter is going remove/rework the cloverleaf intake. Best pull was 840hp torque like a diesel. See if I can scrub another 25 out of it. New power is a drug addiction! I'm pretty confident 93/95. Would like to see click or two under century mark. Give some of my cig friends a run for there money
05-14-2017 | 10:13 PM
#85
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From: Tulsa oklahoma
05-15-2017 | 05:39 AM
#86
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From: Chicago, IL; Onekama, MI
I just went with the Brodix HV2001 intakes for my engines, but was also leaning very heavily toward the Sniper Jr. I had been running the darts also. The Dart is a good intake but as you know, you need to put money/time into it, for it to really work well. Either way, nice results.
10-17-2017 | 11:54 AM
#88
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From: Buffalo, NY
I don't believe most marine EFI systems, rely on o2 sensor feedback for fuel trim.
Mercury Marine used to utlize a spark advance feature, that was based off RPM in the Thunderbolt V I believe. What it would do, is slowly increase the timing during cruise, and if RPM increased, it would keep it there or advance it further. They did this , to increase efficiency and response. It was called MBT , for mean best timing.
Mean-Best-Timing (MBT)
Spark Advance
During light load cruising, the ignition modulesearches for the optimal ignition timing. This is also accomplished by small changes to the spark advance. At a given RPM, the module will try to add a small amount of advance and wait to see if there is an RPM change. If RPM increases, it will try to increase timing more. The module will continue to advance timing until it no longer gets an increase inRPM. Conversely, if it senses an RPM drop, it will start to retard some of the spark timing. The approximate RPM range for this feature is 1200-4000 RPM. Within this range, the ignition module can add approximately 10-15 degrees of spark advance to the base spark timing curve.
I wouldn't say that MAP is strictly linear to RPM in boats. I can cruise at 3500RPM, with the tabs down and drives tucked, with a full tank of gas, and have a much heavier load on the engine, at 3500, then say, if I am in calm water, no tab, and drives nuetral with a light load of fuel. On my S/C engines, it could be a difference of being at say, 0", or 2-3lbs of boost, even though rpm is the same.
I know most thing that carbs are simply a garden hose with a ball valve pouring fuel into the engine, but the reality is, carbs are actually very good at metering fuel vs engine load. The key is, you kinda have to know how to tune them, and adjust them.
The daytona ignition setups, are certainly not a modern EFI comparison, nor are they meant to be. However, for those who don't want to spend the money to switch to EFI, they are imo, a much better choice, than the typical MSD marine box, that really does nothing for you.
The multiple spark they sell you on, isn't a "bonus feature". Its a requirement by design, that they NEED multiple spark at lower rpm, because they simply don't fire a single spark very well at low rpm. Thats with all Capacitive discharge ignitions.
Mercury Marine used to utlize a spark advance feature, that was based off RPM in the Thunderbolt V I believe. What it would do, is slowly increase the timing during cruise, and if RPM increased, it would keep it there or advance it further. They did this , to increase efficiency and response. It was called MBT , for mean best timing.
Mean-Best-Timing (MBT)
Spark Advance
During light load cruising, the ignition modulesearches for the optimal ignition timing. This is also accomplished by small changes to the spark advance. At a given RPM, the module will try to add a small amount of advance and wait to see if there is an RPM change. If RPM increases, it will try to increase timing more. The module will continue to advance timing until it no longer gets an increase inRPM. Conversely, if it senses an RPM drop, it will start to retard some of the spark timing. The approximate RPM range for this feature is 1200-4000 RPM. Within this range, the ignition module can add approximately 10-15 degrees of spark advance to the base spark timing curve.
I wouldn't say that MAP is strictly linear to RPM in boats. I can cruise at 3500RPM, with the tabs down and drives tucked, with a full tank of gas, and have a much heavier load on the engine, at 3500, then say, if I am in calm water, no tab, and drives nuetral with a light load of fuel. On my S/C engines, it could be a difference of being at say, 0", or 2-3lbs of boost, even though rpm is the same.
I know most thing that carbs are simply a garden hose with a ball valve pouring fuel into the engine, but the reality is, carbs are actually very good at metering fuel vs engine load. The key is, you kinda have to know how to tune them, and adjust them.
The daytona ignition setups, are certainly not a modern EFI comparison, nor are they meant to be. However, for those who don't want to spend the money to switch to EFI, they are imo, a much better choice, than the typical MSD marine box, that really does nothing for you.
The multiple spark they sell you on, isn't a "bonus feature". Its a requirement by design, that they NEED multiple spark at lower rpm, because they simply don't fire a single spark very well at low rpm. Thats with all Capacitive discharge ignitions.
Last edited by veloc410; 10-17-2017 at 11:58 AM.
10-17-2017 | 05:14 PM
#89
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From: Buffalo, NY
Supposedly msd and similar boxes give multi spark below 3000 and I've heard after that a long duration single spark of up to 20 degrees. Don't quote me on the 20 duration but it would be worth making a call. Yes definitely run better at idling without foul.
10-17-2017 | 05:30 PM
#90
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From: Buffalo, NY
