mgb260 Jim Nichols Sequim,WA (2463 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: Homemade Flow Bench
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Re: Homemade Flow Bench
[www.topplocksverkstan.se]
Here is another one for you guys. Unfortunately everything is written in Swedish with a few exceptions, but has a lot of pictures and quite a few formulas too. If you need any translation let me know. This guy, Erland Cox, is very recognized in porting cylinder heads and has an immense knowledge in engines. He does not mind sharing it and has very good English if you need to contact him with questions. BTW this is not an advertisement |
Re: Homemade Flow Bench
Jim, I didn't see a recommendation for the power of the shop vac. I've got one that could suck the chrome off a trailer hitch, but it might be more than is needed for this flow bench. Otherwise, this seems like a clever little setup.
The Mustang MAF looks like it is sensitive in the 100-200 CFM range (200Kg to 400Kg), so that should work well. I wonder if the Rover MAF would work? |
mgb260 Jim Nichols Sequim,WA (2463 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: Homemade Flow Bench
Paul,I imagine the port would only flow so much so the bigger the shop-vac the better.How about a RV sewer gate valve and vacuum gauge at the shop-vac. You could adjust to the standard 28" vacuum.The Rover, if Hotwire MAF would probably work if you could figure out the voltmeter connections.The first two pics are the guy's idea. The third one might confuse as it is a real schematic of a flowbench.
Edited 1 time(s). Last edit at 01/20/2010 04:01PM by mgb260. |
mgb260 Jim Nichols Sequim,WA (2463 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: Homemade Flow Bench
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Re: Homemade Flow Bench
Now THAT is clever. I assume that, to prevent it from being a restriction, you stuff something like a 5" pipe with these straws and adapt that back down to either 3" or 4" or whatever plumbing you were using.
What about cutting the straws to different lengths or staggering them to help muffle standing wave effects? |
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mgb260 Jim Nichols Sequim,WA (2463 posts) Registered: 02/29/2008 08:29PM Main British Car: 1973 MGB roadster 260 Ford V8 |
Re: Homemade Flow Bench
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NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: Homemade Flow Bench
Cool project, man. I was considering building one too after reading "Practical Gas Flow". Good book...
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minorv8 Jukka Harkola (269 posts) Registered: 04/08/2009 06:50AM Main British Car: Morris Minor Rover V8 |
Re: Homemade Flow Bench
Popular Hot Rodding magazine had a series of article where they gave instructions for a homebuilt flowbench. I have the pages scanned somewhere, if someone is interested I can find them for you.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Homemade Flow Bench, who do ?
Anybody actually build one ? You can buy a somewhat expensive "kit with black box" included. Somewhere I read you'll need qty. (11) vacum motors ! Why not use a cheap "Rootes" ? 6V71 at swapmeet-$40. Long term satisfaction of making it work-priceless. roverman.
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Dan Jones Dan Jones St. Louis, Missouri (280 posts) Registered: 07/21/2008 03:32PM Main British Car: 1980 Triumph TR8 3.5L Rover V8 |
Re: Homemade Flow Bench
> Why not use a cheap "Rootes" ? 6V71 at swapmeet
That would be suitable for a constant depression (flow drop) type flow bench. The budget flow benches I've seen are variations on Vizard's varying pressure drop design: [www.gofastnews.com] [www.gofastnews.com] Vizard has a good article on this design in one of his books. Basically he noted that since the pressure drop across a valve varies rapidly with valve opening, a constant depression flow bench isn't necessarily better than a bench that permits the pressure to vary. The latter design requires much less flow to operate, permitting simple shop vacs to power the benches. I've got a Beam vacuum unit in my garage that powers a whole house vacuum system. I plan to tap into it for my home made flow bench. I've picked up an old manometer but need to finish up a few other projects before completing the build. Dan Jones |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Homemade Flow Bench, Rootes of the matter
Would not a Rootes with changable restricting orfices, gate valve retriction or cangable blower driven speeds make suitable for various pressure drops ? Seems like this blower could make pretty high vacum for more engine- like flows on exhaust port. roverman.
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MGBV8 Carl Floyd Kingsport, TN (4514 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Homemade Flow Bench, Rootes of the matter
"I've got a Beam vacuum unit in my garage that powers a whole house vacuum
system. " Great idea, Dan! Hmmm....I have a pretty big vacuum unit for my Skat Blast cabinet that may work, as well. ;) |
Dan Jones Dan Jones St. Louis, Missouri (280 posts) Registered: 07/21/2008 03:32PM Main British Car: 1980 Triumph TR8 3.5L Rover V8 |
Re: Homemade Flow Bench
> Would not a Rootes with changable restricting orfices, gate valve retriction or
> cangable blower driven speeds make suitable for various pressure drops? You wouldn't need to do it that way. On a standard flow bench, pressure drops as soon as you open the valve. At each lift increment, you increase the suction of the pump to maintain a constant pressure drop. In the Vizard bench, you don't attempt to maintain a constant pressure drop. You let the flow/pressure drop change as it would in the engine. The Rootes would work but would require a rather sizeable electric motor to run which would defeat the low cost nature of the approach. Dan Jones |
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Homemade Flow Bench/ Kit ?
Ok, I'm seriously considering a "Flow Performance" flowbench kit. Not cheap but digitalized,(electronic manometers), that runs with windows 98 +. I have a 3 hp industrial vacum, maybe adequate ? Anybody ? Thanks, roverman.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Homemade Flow Bench, kit on the way
Yea, Now if I just had some TA heads to plop on it. roverman.
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WernerVC Werner Van Clapdurp Lynchburg, Va (108 posts) Registered: 09/06/2009 12:56PM Main British Car: MGB 1977 Rover 3.5 |
Re: Homemade Flow Bench
Hi Roverman,
Last year I shipped a Flow Performance kit to my friend in Belgium. He uses it for his MGA twin cam heads and he loves the performance of the kit. A bit expensive but he says it is well worth it. Werner |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Homemade Flow Bench vs. Superflow/ etc.
Werner, Ok so $1,000. US. is expensive ? I suggest pricing a comparable flow "Superflow", for a better definition of ex$$pensive ! Cheers, roverman.
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