High Flow Injector Fitting
Thread Starter
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Intermediate
Joined: Jun 2007
Posts: 41
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From:
High Flow Injector Fitting
Hey guys,
Since my stock injectors are "overworking" I see the need of bigger ones, my math tells me my need is something around 5gr/sec. I would like to know if the 27797-07 SE High Flow Injector fits the 96ci stock manifold, they say it only fits the SE manifold, but the injector look quite the same as mine. Does anybody can give me a light on that?
Kuryakyn also have a hi flow injector, but is 5,54g/sec. Anybody using it?
Also, my question is, is there more option for hi flow injector for 96ci manifolds?
Thanks!
Hernan
Since my stock injectors are "overworking" I see the need of bigger ones, my math tells me my need is something around 5gr/sec. I would like to know if the 27797-07 SE High Flow Injector fits the 96ci stock manifold, they say it only fits the SE manifold, but the injector look quite the same as mine. Does anybody can give me a light on that?
Kuryakyn also have a hi flow injector, but is 5,54g/sec. Anybody using it?
Also, my question is, is there more option for hi flow injector for 96ci manifolds?
Thanks!
Hernan
Outstanding HDF Member
Joined: May 2007
Posts: 2,304
Likes: 31
From: Florida
Hey guys,
Since my stock injectors are "overworking" I see the need of bigger ones, my math tells me my need is something around 5gr/sec. I would like to know if the 27797-07 SE High Flow Injector fits the 96ci stock manifold, they say it only fits the SE manifold, but the injector look quite the same as mine. Does anybody can give me a light on that?
Kuryakyn also have a hi flow injector, but is 5,54g/sec. Anybody using it?
Also, my question is, is there more option for hi flow injector for 96ci manifolds?
Thanks!
Hernan
Since my stock injectors are "overworking" I see the need of bigger ones, my math tells me my need is something around 5gr/sec. I would like to know if the 27797-07 SE High Flow Injector fits the 96ci stock manifold, they say it only fits the SE manifold, but the injector look quite the same as mine. Does anybody can give me a light on that?
Kuryakyn also have a hi flow injector, but is 5,54g/sec. Anybody using it?
Also, my question is, is there more option for hi flow injector for 96ci manifolds?
Thanks!
Hernan
Road Master
Joined: Mar 2007
Posts: 1,177
Likes: 23
Do you have a SERT. If so, it is fairly easy to figure out what the all important injector max duty cycle is. With the bikes I have seen, the injectors are quite large compared to the power these bikes make.
AW
AW
Thread Starter
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Intermediate
Joined: Jun 2007
Posts: 41
Likes: 0
From:
Well, my injectors, from 4500rpm and up, are working at 25ms (I understand a good value should be ~16ms, or 80% of duty cycle @ 6000rpm). I've set my AFR to work on 12.8 basis on WOT. First, I can't reach the 12.8 when i'm at wot and more than 5000rpm, so I understand I need more fuel.
My build is not the issue but the fuel I use on my engine. The build is a regular 96ci with TCFI from DTT, free A/C, unrestricted short pipes, an andrews 37 cam, a little charger on the intake (add 8% more air, so I need 8% more fuel flow) and the fuel is a 25%~30% ethanol, it means I need to add 10%~15% more fuel to reach the same AFR.
The regular injector flows 3,9g/sec, I guess that is 80% of my flow needs at 6000rpm and AFR 14.5.
My bike adds the following:
AFR 12.8 (13% more fuel)
Cam (10~15% more from 4000rpm, lets use 10%)
Charger (8% more)
Ethanol (10% more)
A/C+Pipes (lets say 5% more)
TOTAL: 46%
It's the first time I'm doing this math, but the total value is aprox. the same amount I've seen in my PW map needs. The pulse width is working at 130% of duty cycle and the math says something around that (80+46)...
Anyway, does the SE injectors fit my stock manifold???
My build is not the issue but the fuel I use on my engine. The build is a regular 96ci with TCFI from DTT, free A/C, unrestricted short pipes, an andrews 37 cam, a little charger on the intake (add 8% more air, so I need 8% more fuel flow) and the fuel is a 25%~30% ethanol, it means I need to add 10%~15% more fuel to reach the same AFR.
The regular injector flows 3,9g/sec, I guess that is 80% of my flow needs at 6000rpm and AFR 14.5.
My bike adds the following:
AFR 12.8 (13% more fuel)
Cam (10~15% more from 4000rpm, lets use 10%)
Charger (8% more)
Ethanol (10% more)
A/C+Pipes (lets say 5% more)
TOTAL: 46%
It's the first time I'm doing this math, but the total value is aprox. the same amount I've seen in my PW map needs. The pulse width is working at 130% of duty cycle and the math says something around that (80+46)...
Anyway, does the SE injectors fit my stock manifold???
Road Master
Joined: Mar 2007
Posts: 1,177
Likes: 23
Cool This is getting far more interesting than I was thinking....
Try this spreadsheet. It takes into account lots of things that most injector calc sheets sweep under the table.
I think the Harley world needs to stay in the 50% max DC range. There are some hidden things going on in the code that may screw up at long DCs
http://www.ncs-stl.com/fuel/ReqInjectors03.xls
AW
Try this spreadsheet. It takes into account lots of things that most injector calc sheets sweep under the table.
I think the Harley world needs to stay in the 50% max DC range. There are some hidden things going on in the code that may screw up at long DCs
http://www.ncs-stl.com/fuel/ReqInjectors03.xls
AW
Last edited by whittlebeast; Sep 17, 2008 at 10:25 AM.
Outstanding HDF Member
Joined: May 2007
Posts: 2,304
Likes: 31
From: Florida
Well, my injectors, from 4500rpm and up, are working at 25ms (I understand a good value should be ~16ms, or 80% of duty cycle @ 6000rpm). I've set my AFR to work on 12.8 basis on WOT. First, I can't reach the 12.8 when i'm at wot and more than 5000rpm, so I understand I need more fuel.
My build is not the issue but the fuel I use on my engine. The build is a regular 96ci with TCFI from DTT, free A/C, unrestricted short pipes, an andrews 37 cam, a little charger on the intake (add 8% more air, so I need 8% more fuel flow) and the fuel is a 25%~30% ethanol, it means I need to add 10%~15% more fuel to reach the same AFR.
The regular injector flows 3,9g/sec, I guess that is 80% of my flow needs at 6000rpm and AFR 14.5.
My bike adds the following:
AFR 12.8 (13% more fuel)
Cam (10~15% more from 4000rpm, lets use 10%)
Charger (8% more)
Ethanol (10% more)
A/C+Pipes (lets say 5% more)
TOTAL: 46%
It's the first time I'm doing this math, but the total value is aprox. the same amount I've seen in my PW map needs. The pulse width is working at 130% of duty cycle and the math says something around that (80+46)...
Anyway, does the SE injectors fit my stock manifold???
My build is not the issue but the fuel I use on my engine. The build is a regular 96ci with TCFI from DTT, free A/C, unrestricted short pipes, an andrews 37 cam, a little charger on the intake (add 8% more air, so I need 8% more fuel flow) and the fuel is a 25%~30% ethanol, it means I need to add 10%~15% more fuel to reach the same AFR.
The regular injector flows 3,9g/sec, I guess that is 80% of my flow needs at 6000rpm and AFR 14.5.
My bike adds the following:
AFR 12.8 (13% more fuel)
Cam (10~15% more from 4000rpm, lets use 10%)
Charger (8% more)
Ethanol (10% more)
A/C+Pipes (lets say 5% more)
TOTAL: 46%
It's the first time I'm doing this math, but the total value is aprox. the same amount I've seen in my PW map needs. The pulse width is working at 130% of duty cycle and the math says something around that (80+46)...
Anyway, does the SE injectors fit my stock manifold???
Look at this site I'm sure it will help you out with the injector size and where to get them. http://www.injector.com/harleyinjection.php
Thread Starter
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Intermediate
Joined: Jun 2007
Posts: 41
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From:
Your build does make a difference whe npicking an injector. If your over 20ms at 6000 rpm your over the limit, your understanding of that is correct. http://www.rbracing-rsr.com/fuelinjectors.htm
Look at this site I'm sure it will help you out with the injector size and where to get them. http://www.injector.com/harleyinjection.php
Look at this site I'm sure it will help you out with the injector size and where to get them. http://www.injector.com/harleyinjection.php
But the question is still if I can use an SE injector in the stock 96 manifold...
Answering the info given by whittlebeast, I agree, I also believe there is something else about the Hd injectors, maybe the old-tech v-twin behaves a little different than modern 4-8cil engines. It has to be some hidden issues about the injector, the traditional math doesnt work well on Twincams...
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Outstanding HDF Member
Joined: May 2007
Posts: 2,304
Likes: 31
From: Florida
Thanks, they seem to have the injector I need, at least they have a couple of "flow sizes" injectors to choose.
But the question is still if I can use an SE injector in the stock 96 manifold...
Answering the info given by whittlebeast, I agree, I also believe there is something else about the Hd injectors, maybe the old-tech v-twin behaves a little different than modern 4-8cil engines. It has to be some hidden issues about the injector, the traditional math doesnt work well on Twincams...
But the question is still if I can use an SE injector in the stock 96 manifold...
Answering the info given by whittlebeast, I agree, I also believe there is something else about the Hd injectors, maybe the old-tech v-twin behaves a little different than modern 4-8cil engines. It has to be some hidden issues about the injector, the traditional math doesnt work well on Twincams...
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