thoughts on this

[bigdemo1]

Any thoughts on this http://www.hotrodders.com/forum/members/hotmetal800.html

 

[fishy68]

?? Somebody's profile?

 

[bigdemo1]

sorry wrong link,oops.should of been this on homemade flowbench
A vacuum gauge assembly will not work. I use a MAF from a 1995 Ford. Would you like a diagram? Go to my profile and then to my photo gallery for the diagram.
A mass air flow sensor from Hitachi or Ford are the Hot wire
type. Generally most flow benchs use an inclined manometer and
a u tube manometer. These measure flow indirectly. A pitot tube is
inserted into the air flow and delivers air flow to the manometers.
A MAF sensor can determine air mass without the need for additional sensors. They can account for and compensate for temperature and barometric pressure changes automatically.
A vane type airflow sensor can detect a cubic foot of air, whether it is cold or hot, but it cannot detect the difference in air mass as a cubic foot of cold air is more dense than a cubic foot of hot air.
A mass air flow sensor can. This is why my system works. I start
by measuring one intake and one exhaust. This tells you what you have before any mods are made. I take lift readings at 0.50,0.15, 0.10, 0.20 up to the max lift of your cam profile.
I do not reverse flow for exhaust(readings are within 5cfms).
Once a table is made(algebra) I can plot my graph. I use a T183
calculater to input my data and instantly look at a graph.
Last edited by hotmetal800 : 12-15-2004 at 01:15 PM.

 

[rumblefish360]

No, er yes, in his profile are pictures and instructions to make your own "Poor mans flow bench"

Later on in the post, someone left this;
http://tractorsport.com/cgi-bin/forum/cgi-bin/ikonboard.cgi
A forum deadicated to makeing flow benchs.

 

[fishy68]

No, er yes, in his profile are pictures and instructions to make your own "Poor mans flow bench"

Later on in the post, someone left this;
http://tractorsport.com/cgi-bin/forum/cgi-bin/ikonboard.cgi
A forum deadicated to makeing flow benchs.

Oh ok. I didn't look at his photo album. Interesting.

 

[bigdemo1]

So what do you think?any good?

 

[rumblefish360]

I dunno? Looks like fun though. IF you can actually get to understand it and translating it, you could have a good tool on hand.

 

[bigdemo1]

Yes,I was hoping I could understand it a little better.Maybe some of the porters could chime in on this.

 

[fishy68]

It's sure simple enough. I don't know much about the electronic stuff to know how accurate a MAF sensor reading would be. If it's accurate it looks like your on to something.

 

[bigdemo1]

I'm thinking the graphing would be the hardest part(for me anyway)Also I'm wandering about a program to support this somehow,I have the calculator I use it for cross dialing alignments,maybe I'll try to contact hotmetal see about support.

 

[Petzschler]

So what do you think?any good?

looks promising. hope it works.

another thought..

if you could figure out the values of the signal the MAF is sending out, and by using a volt meter, you can acurately determine the cfm flow. cause thats all the computer really reads is.. voltage signal.

eg:

.1 volt = X cfm
.15 volt = X cfm etc

now the only problem is, how does one determine "X". i guess you can use a actual flow bench to do that with.

 

[bigdemo1]

I was thinking about known values for a simple comparisson chart,does anyone think this would work?

 

[wigsplitter74]

I'm lost, but if it works I've got a Delorean I'd like you to take a look at lol good luck sorting it out man

 

[bigdemo1]

Hey found a flux capacitor on line at thinkgeek.

 

[waggin]

He's up by bronson motor speedway,bout an hour from here...

 

[fishy68]

Hey found a flux capacitor on line at thinkgeek.

Heck I've got 2 of them. Their used in separately excited motor controllers on electronic forklifts. LOL

As far as the bench and readings from a MAF sensor I think the only way you could get accurate readings is to test a head on a known good flow bench and then do it on the home made bench and convert the readings the MAF sensor is sending to cfm. Even if it's not perfectly accurate it still should be close and at the least you could use it to test ports, manifolds, etc.. before and after you do porting on them. That would tell you if your gaining ground. Just my thoughts.

 

[lead69]

Check out this link http://www.gofastnews.com/board/technical-articles/980-porting-school-2-super-cheap-flow-bench.html Also check out the other articles below including the digital setup http://www.gofastnews.com/board/tec...orting-school-4-budget-bench-electronics.html If you look at superflows website even they are now offering digital software setups for their benches.My plan is to build my own air source (multiple fans capable of 28in.) and use the digital setup,should be every bit as accurate as a orifice type and not have to deal with whatever the guy running the bench decides is correct.

 

[Valiant422]

I have a printed article, and they used shop vac's for vacumm