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DATN510

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Yes mike explained that part to me on the diameter of the runner.

How do I get the air going into penum not to go into #1 cylinder? I have a set of Shorty volocity stacks and a set of 2 1/2 inch stacks.

Million dollar question.With the angle,the air going into #1 is going to have a short straight run..Not good for "things being equal"department.THe stacks would help,but i can't say if they are the answer.I'm going to be talking to some "in the know" folks soon.I'll put it past them and see what they say.If i were you,i'd start asking some posers to some people that build manifolds for a living.Better to ask questions now.

 

To be sure of things,you'd want to put the manifold on a flow bench.And i know that's not what you wanted to hear. :(

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All righty then, I've been dooing my home work on this plenum cover design and air flow on EFI systems and also talked to a few professionals on the matter.

And didn't get anything solid. from what I learned on the web and what you guys have told me, I came up with my own solution. So I changed my plenum design to what I figured would work with my setup.

This is what I came up with.

 

 

IMG_20111121_162445.jpg

 

I made it larger in the front and angled the end to keep the air flow even, and I sealed the plenum in.IMG_20111121_162452.jpg

 

Then I thought How can I measure this................................................Then I remembered I have a sinc for my webers but that only measures suction...........................Thinking again I modified my vacuum,

 

I put a restrictor in the middle with duct tape and hooked it up to the air chamber.IMG_20111121_171332.jpg

 

 

IMG_20111121_171324.jpg

 

Turned on the vac. and got some great readings from the sinc.

 

#1

IMG_20111121_172157.jpg

#2

IMG_20111121_172208.jpg

#3

IMG_20111121_172219.jpg

#4

IMG_20111121_172224.jpg

 

All these ports had the same readings with the sync, I then switch the vac to blower to see how that ran of course I had no way of measuring this so I listend to each port and they all sounded the same.

 

I guess my question is that is this test accurate?

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Did you block off the other ports while you were testing one?

 

I was thinking the same thing....but then he would get 100% flow from vacuum....????

Which would give all the same readings.... on all the ports

The Unisnyc should be sealed to each individual port....other ones left open?

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Turn it around.Seal the meter to the TB"flange"and then seal the hose to each port while the others are taped shut.At least that way you'll be "sucking the right way" :blink:

 

Of course this isn't going to simulate the real deal,but it MIGHT give you some info to make a reasonable guess with.

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I was thinking the same thing....but then he would get 100% flow from vacuum....????

Which would give all the same readings.... on all the ports

The Unisnyc should be sealed to each individual port....other ones left open?

 

 

That's how I did the original test, I left all the ports open and just put the sync on one at a time.

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I was thinking the same thing....but then he would get 100% flow from vacuum....????

I don't have to say this is not a realistic way of going about this.BUT.......having said this,it should show some differences(especially between 1 & 4)and some conclusions can be drawn.And maybe,that conclusion will be that more testing or research needs to be done-who knows?

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I don't have to say this is not a realistic way of going about this.BUT.......having said this,it should show some differences(especially between 1 & 4)and some conclusions can be drawn.And maybe,that conclusion will be that more testing or research needs to be done-who knows?

 

Yeah...I hear ya....moar research :D

 

Can't remember what site I was at, but... it was on plenum design.

I believe the link was posted by Skib on another Ratsun thread

 

Was rather informative

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Yeah...I hear ya....moar research :D

 

Can't remember what site I was at, but... it was on plenum design.

I believe the link was posted by Skib on another Ratsun thread

 

Was rather informative

Well?WTF ya waitin' fer?No such thing as too much info unless you're talking about Rosie O'Donnell. :blink:

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Ok I ran the test the opposite way with pics take a look.

 

I used a different vac that fit perfect in the ports.

 

IMG_20111121_193339.jpg

 

#4

IMG_20111121_193408.jpg

 

 

#4 sync reading

IMG_20111121_193523.jpg

 

#3

IMG_20111121_193737.jpg

 

#3 sync reading

IMG_20111121_193800.jpg

 

#2

IMG_20111121_193917.jpg

#2 sync reading

IMG_20111121_193926.jpg

 

#1

IMG_20111121_194030.jpg

#1 sync reading

 

IMG_20111121_194042.jpg

 

Ok every reading is exactly the same as the the last even with the other vac. I think this is going to work, what do you think?

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Yeah...I hear ya....moar research :D

 

Can't remember what site I was at, but... it was on plenum design.

I believe the link was posted by Skib on another Ratsun thread

 

Was rather informative

 

 

Is this what you are looking for?

Its at the bottom of the page

 

http://community.ratsun.net/topic/23128-fuel-injection-on-a-l20-using-mega-squirt/page__st__20

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Is this what you are looking for?

Its at the bottom of the page

 

http://community.ratsun.net/topic/23128-fuel-injection-on-a-l20-using-mega-squirt/page__st__20

 

Thanks for the thread you posted helped out a lot

I'm going with my design but will modify the end a little and round it out some

Ill start that when I get back from Oregon.

thanks again for all your helps. Happy Thanksgiving.

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