carburettor draw through turbocharging

[SpeedRated]

[QUOTE=golfworx;215383]True.

My friend's dad's 13b was the fastest street rotary in OZ in 89 & the only rotary in the 9 sec street car club. Ended up running 9.78@145mph in 90.

All with draw through weber technology & alittle gas.

Behold, the octopus!!!!

Hello All.
This is my 1st post here and am glad to see people are looking into this old tech.
I might not be a water cooled VW guy, but we are all gear heads, right?

I have to ask who made those manifolds!!!?

I have been looking into draw thru setups for some time (3 years ) for a 13B. Trying to find one here in the U.S is like pulling teeth!!!
One thing I have not seen mentioned in this thread is the fact that a draw thru setup will atomize the gas on boost way better than blow thru. And the fule cool's the intake temps at the compressor blades when it atomizes. That's where the intake's heat is generated in the 1st place.
I see it as a Win Win, low tech style.

Dave

[aprr32]

Spraying fuel onto a compressor that spinning at 80,000 rpm plus does erode the blades over time.I had a su suck through 1600 Golf 1 in the early 80's and the compressor would be almost worn out out 40'000 km's.( turbo rebuilds in those days weren't as cheap as today)It did go rather well and 170 hp was a lot of power when only v8's ruled the streets.

[SpeedRated]

Thanks for the info.
I see how that would be a problem.
Glad to be getting info from people who have done this kind of set up.

Great forum.

[gldgti]

indeed, SpeedRated Dave - i think its a win win too! (welcome to the forum!)

given junkyard turbo's are plentiful in my district (saab/renoult/pug/volvo wreckers nearby) and i have cheap and easy access to lasercutters and welding (i love work) then i'm not concerened about tubo life really (feels good to say).

[Jarred]

Can you use a standard turbo, or do you need a carbon sealed unit though?

[Oneofthegreats]

Hello All.
This is my 1st post here and am glad to see people are looking into this old tech.
I might not be a water cooled VW guy, but we are all gear heads, right?

I have to ask who made those manifolds!!!?

I have been looking into draw thru setups for some time (3 years ) for a 13B. Trying to find one here in the U.S is like pulling teeth!!!
One thing I have not seen mentioned in this thread is the fact that a draw thru setup will atomize the gas on boost way better than blow thru. And the fule cool's the intake temps at the compressor blades when it atomizes. That's where the intake's heat is generated in the 1st place.
I see it as a Win Win, low tech style.

Dave

G'day Dave & welcome to the vww world.

I'm sorry, but I really can't help you with that carby setup. This was done long before I knew the family & I was less than 10 years old!

The intake manifold is a off the shelf (brand - performance ?) & also probably modified & the exhaust is home built.

I do know that this setup is not as simple as it's look's from some of the story's told.

It consisted of a bunch of fuel pump's to not only supply fuel, but to also draw fuel out of the carby, along with a couple of home built rising rate regulator's long before they were even invented!

He has said he use to tune it by richening it up until it couldn't run, stall & dump fuel out the exhaust & then back it off just alittle.

Turbo'd, draw through carby's & rotary's is where they got there bad name & bad reputation for blowing up from.

You just couldn't keep fuel up to it.

He did say he built a massive bridge port, draw through setup that was the fastest & scariest thing he'd driven back then, but it just couldn't keep fuel up it & as such would blow up after one run.

How many rotary's do you see blow up these day's with current technology. Not many.

I've heard of more piston engine's lunching themselves lately than rotary's.