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914World.com _ 914World Garage _ Thoro-Tec air intake
Posted by: 914-300Hemi Oct 22 2020, 07:17 PM
I found this air intake system for Weber carbs from Thoro-Tec https://www.thoro-tec.de/en/p/air-intake-system-typ-4-weber-idf40-44-914-bulli-beetle
They also have other 914 related items.
Posted by: Superhawk996 Oct 23 2020, 06:30 AM
"Looks" nice from an elegant visual design standpoint but I'm wondering how it flows and whether or not it accomodates velocity stacks.
It looks constricted to me forcing a 90 degree airflow change and potential for turbulence just before the venturi. However, I've seen CFD on other designs that I thought didn't look optimal and they performed well both in CFD and later on during validation testing.
This is the sort of stuff that I think the company needs to provide CFD and/or dyno proof before I'd shell out $1000 for what is esentially a pretty air filter.
Posted by: Mikey914 Oct 23 2020, 06:32 AM
I'd be interested in flow specs.
Looks better for forced induction.
Posted by: bdstone914 Oct 23 2020, 07:28 AM
Agree with the above comments. Look like far less filter surface area. In addition to the flow specs what are the filtration properties?
I guess one benefit would be less likely to catch fire if the car backfires.
Posted by: Superhawk996 Oct 23 2020, 07:36 AM
QUOTE(bdstone914 @ Oct 23 2020, 09:28 AM)
. . . what are the filtration properties?
Does it matter? Filter is red. Surely adds 15 HP.
Posted by: JmuRiz Oct 23 2020, 08:43 AM
Would be better with an MSDS filter. I like the clean look.
As much as I like the filter hats on a /6 engine I'll probably run the modified stock airbox i got from Britain Smith.
Posted by: gereed75 Oct 23 2020, 09:06 AM
They also have three rain hat type covers
Posted by: Mark Henry Oct 23 2020, 10:02 AM
Not enough volume.
It needs something like a /4 version of a /6 intake, large central plenum, large runners and as much height over the velocity stacks as possible.
M96 has two 4"(-ish) tubes but they're attached to two large plenums, total volume of several liters.
Posted by: 73-914 Oct 23 2020, 10:14 AM
overpriced "Dreck"
Posted by: SirAndy Oct 23 2020, 10:50 AM
QUOTE(Superhawk996 @ Oct 23 2020, 05:30 AM)
"Looks" nice from an elegant visual design standpoint but I'm wondering how it flows and whether or not it accomodates velocity stacks.
@http://www.914world.com/bbs2/index.php?showuser=22428 Wouldn't the long runners double as velocity stacks? Seems like they should ...
Posted by: Superhawk996 Oct 23 2020, 11:04 AM
QUOTE(SirAndy @ Oct 23 2020, 12:50 PM)
QUOTE(Superhawk996 @ Oct 23 2020, 05:30 AM)
"Looks" nice from an elegant visual design standpoint but I'm wondering how it flows and whether or not it accomodates velocity stacks.
@http://www.914world.com/bbs2/index.php?showuser=22428 Wouldn't the long runners double as velocity stacks? Seems like they should ...
@http://www.914world.com/bbs2/index.php?showuser=179 I think you are right they might serve to boost flow velocity initially but then that 90 degree turn without much height above the venturi would mess it up as it then decelerates flow into the tiny "plenum" over the 2 barrels of the carb.
Velocity stacks might help restablish a linear flow down into the venturi but those little plenums above each carb would seem to constrict flow downward into a velocity stack for each venturi.
All purely speculation on my part. At a bare minimum I'd want to see a dyno plot that shows HP is at least equal to standard IDF style filters.
I really do like how clean it looks. Just not convinced it won't cost HP.
Posted by: douglastic Oct 23 2020, 11:09 AM
Looking at it makes me feel like I'm breathing through a straw.
Posted by: JamesM Oct 23 2020, 11:36 AM
QUOTE(Mikey914 @ Oct 23 2020, 04:32 AM)
I'd be interested in flow specs.
Looks better for forced induction.
Was wondering what the advantage of this setup is given the air filter is still exposed to the elements. It looks very similar to the various CB performance setups for forced induction.
https://www.cbperformance.com/product-p/7312t.htm
If doing non forced induction and want to join both stacks to a single air filter, i think this is the better way to go as it actually protects from the rain.
https://www.ahnendorp.com/VW-Type-4---Porsche-914-engineparts-and-machining/Carburettors--Manifolds--Supplies-74/Central-Air-Filter-System-VW-type-4-2-0-with-Porsche-Cooling--complete-set-for-one-engine--to-fit-with-Weber-IDF-und-Dellorto-1444.html?language=en
Posted by: 914_teener Oct 23 2020, 11:46 AM
QUOTE(JamesM @ Oct 23 2020, 10:36 AM)
QUOTE(Mikey914 @ Oct 23 2020, 04:32 AM)
I'd be interested in flow specs.
Looks better for forced induction.
Was wondering what the advantage of this setup is given the air filter is still exposed to the elements. It looks very similar to the various CB performance setups for forced induction.
https://www.cbperformance.com/product-p/7312t.htm
If doing non forced induction and want to join both stacks to a single air filter, i think this is the better way to go as it actually protects from the rain.
https://www.ahnendorp.com/VW-Type-4---Porsche-914-engineparts-and-machining/Carburettors--Manifolds--Supplies-74/Central-Air-Filter-System-VW-type-4-2-0-with-Porsche-Cooling--complete-set-for-one-engine--to-fit-with-Weber-IDF-und-Dellorto-1444.html?language=en
People drive a 914 in the rain?
Fluid mechanics sometimes has surprising results. I can't imagine anybody making something like this without modeling it.
My quess is that is is quieter more than anything else.
Posted by: AZBanks Oct 23 2020, 12:03 PM
Adding oil just got a little more time consuming.
Posted by: Superhawk996 Oct 23 2020, 01:21 PM
QUOTE(914_teener @ Oct 23 2020, 01:46 PM)
I can't imagine anybody making something like this without modeling it.
I can. Happens all the time. Sort of looks like they might be 3D printed as an on demand business model. Can't imagine them selling more than 1 or 2 at that price point. 914/4 owners not exactly known for rollling in cash and spending big $ on parts.
Long ago I had a conversation over beer with a buddy. We discussed going into the aftermarket business, making "hop-up" parts, and how we might market them based on what goes on in the industry.
We both eventually arrived at the postion that unless we were going to be willing to make absurd claims about added horsepower, improved fuel economy, etc., we might be giving up lots of money to those that do. We both decided to focus on our day jobs.
My hat goes off to the suppliers we have supporting this community and providing honest products and standing behind them.
It ain't easy!
Posted by: jd74914 Oct 23 2020, 01:27 PM
QUOTE(914_teener @ Oct 23 2020, 12:46 PM)
Fluid mechanics sometimes has surprising results. I can't imagine anybody making something like this without modeling it.
My quess is that is is quieter more than anything else.
True...but usually aftermarket stuff like this isn't modeled well. Most really falls in the
Colorful
Fluid
Dynamics realm where people assume presentation==validity. Generally intake simulations kinda suck to do by their cyclic nature and aren't really for the faint of heart.
That said, it does look really nicely made! I am curious to know what the base at the carb looks like. Seems like their might be enough room for a nice partial bellmouth which would be OK. I'd agree with that, you're damping a lot of the noise of the butterflies which can be nice.
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