fabrication question
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fabrication question
I need to construct an air bypass line for intake runners. I would like to be able to restrict the airflow if needed. What would be the best way to tackle this ?
PS : I don't have a mill nor a lathe.
PS : I don't have a mill nor a lathe.
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Re: fabrication question
You're a little short on detail but if for example you were talking say a 3/16" neoprene hose to each runner, you could press in brass Allen head set screws drilled to the desired orifice size. A box of 50 is only a few bucks from McMaster Carr or the like and would give lots of scope for going too big and starting over. If you're talking one big hose, you could just drill a metal or plastic slug of the right diameter, either pressed or threaded in.
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Re: fabrication question
iac air to individual runners that I need to get balanced. The full details would mean a very very long explanation....
Last edited by Belgian1979 on Sun Mar 11, 2018 3:55 am, edited 2 times in total.
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Re: fabrication question
That looks like something I could work with. However I'm dealing with an alu line which is fixed into the runner. Need to give this another thought.MadBill wrote: ↑Sat Mar 10, 2018 4:12 pm You're a little short on detail but if for example you were talking say a 3/16" neoprene hose to each runner, you could press in brass Allen head set screws drilled to the desired orifice size. A box of 50 is only a few bucks from McMaster Carr or the like and would give lots of scope for going too big and starting over. If you're talking one big hose, you could just drill a metal or plastic slug of the right diameter, either pressed or threaded in.
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carb jets 003.jpg
Thanks Bill.
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Re: fabrication question
How about needle valve manifold for aquarium co2 systems
http://www.aquacave.com/aquarium-co2-su ... alves.html
http://www.aquacave.com/aquarium-co2-su ... alves.html
LIGHT 'EM UP
Re: fabrication question
Dump the ITBs and use a proper manifold with plenum.Belgian1979 wrote: ↑Sat Mar 10, 2018 2:11 pm I need to construct an air bypass line for intake runners. I would like to be able to restrict the airflow if needed. What would be the best way to tackle this ?
PS : I don't have a mill nor a lathe.
Re: fabrication question
The easiest would be don't bother then adjust the throttle plates to balance it. If you set the unloaded warm idle using the throttle not the is the whole system will be much less sensitive and your off idle throttle will be easier to manage
A version Bills suggestion is the other path. The fanciest version is to use needle valves, they make pipe thread on 1 end that you could screw into the little plenum. The very cheapest version is solder the fittings you have shut and drill to size.
A version Bills suggestion is the other path. The fanciest version is to use needle valves, they make pipe thread on 1 end that you could screw into the little plenum. The very cheapest version is solder the fittings you have shut and drill to size.
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Re: fabrication question
---I did the same thing on a Crower fuel injection---
---I found 8 small needle valves with 1/4" tube spouts and 1/8NPT male fitting ends---just use some short pieces of push-on hose.
---I don't remember where the valves came from.
---I found 8 small needle valves with 1/4" tube spouts and 1/8NPT male fitting ends---just use some short pieces of push-on hose.
---I don't remember where the valves came from.
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Re: fabrication question
Your local plumbing or hardware store should have small brass bleed screws very similar to those posted by Bill Jones
They're used to vent air bubbles out of the radiators in countless large buildings such as libraries and hotels
They're used to vent air bubbles out of the radiators in countless large buildings such as libraries and hotels
Re: fabrication question
It would be far easier to use an IAC motor that opened the throttle directly, for various reasons related to the strangeness of IR setups. 1980s Cadillacs with the 4.1/4.5/4.9l engine used a stepper motor throttle stop for idle control that would serve you well.Belgian1979 wrote: ↑Sun Mar 11, 2018 3:53 amiac air to individual runners that I need to get balanced. The full details would mean a very very long explanation....
Re: fabrication question
Plenum manifold engines drive like shit. Poor throttle response and awful midrange.joe 90 wrote: ↑Sun Mar 11, 2018 6:35 amDump the ITBs and use a proper manifold with plenum.Belgian1979 wrote: ↑Sat Mar 10, 2018 2:11 pm I need to construct an air bypass line for intake runners. I would like to be able to restrict the airflow if needed. What would be the best way to tackle this ?
PS : I don't have a mill nor a lathe.
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Re: fabrication question
This certainly is a possibility, but I never found a stepper motor powerfull enough to work against the springs and such. Do you have a part number ?peejay wrote: ↑Sun Mar 11, 2018 12:44 pmIt would be far easier to use an IAC motor that opened the throttle directly, for various reasons related to the strangeness of IR setups. 1980s Cadillacs with the 4.1/4.5/4.9l engine used a stepper motor throttle stop for idle control that would serve you well.Belgian1979 wrote: ↑Sun Mar 11, 2018 3:53 amiac air to individual runners that I need to get balanced. The full details would mean a very very long explanation....
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Re: fabrication question
Bill,bill jones wrote: ↑Sun Mar 11, 2018 10:12 am ---I did the same thing on a Crower fuel injection---
---I found 8 small needle valves with 1/4" tube spouts and 1/8NPT male fitting ends---just use some short pieces of push-on hose.
---I don't remember where the valves came from.
individual cylinder idle air control for Crower fuel injection.jpg
Interestingly enough I was thinking of doing something similar. Did the needles work in a 1/4" hole. Most needles I see are very tiny and wouldn't allow enough airflow past them.