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Stormin189
Samba Member
Joined: February 14, 2018
Posts: 55
Location: Santaquin utah
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 Posted: Tue Dec 27, 2022 9:00 pm Post subject: Harley SS carb, draw thru Turbo 1641 |
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Not sure if this is going to work, but it's happening |
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earthquake
Samba Member
Joined: January 10, 2008
Posts: 3984
Location: SANDY VALLEY, NEVADA
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| Posted: Wed Dec 28, 2022 1:25 pm Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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I have a couple of Keihin 40mm CV carbs off of Sportsters that I want to try on a NA VW, I thought about doing a single and duals. For a single it would not be hard to just make a elbow adapter to bolt one on a stock manifold.
eQ
_________________
74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
[From a military recruitment poster in the novel "The Stainless Steel Rat" By Harry Harrison] |
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earthquake
Samba Member
Joined: January 10, 2008
Posts: 3984
Location: SANDY VALLEY, NEVADA
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| Posted: Wed Dec 28, 2022 1:26 pm Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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I don't know how I posted twice
_________________
74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
[From a military recruitment poster in the novel "The Stainless Steel Rat" By Harry Harrison]
Last edited by earthquake on Fri Dec 30, 2022 10:22 pm; edited 1 time in total |
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DesertSasquatchXploration
Samba Member
Joined: April 16, 2021
Posts: 547
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| Posted: Wed Dec 28, 2022 4:19 pm Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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| earthquake wrote: |
I have a couple of Keihin 40mm CV carbs off of Sportsters that I want to try on a NA VW, I thought about doing a single and duals. For a single it would not be hard to just make a elbow adapter to bolt one on a stock manifold.
eQ |
Tried this with a 40mm YZ 450 carb made a elbow adaptor to the stock DP intake fuel bowls in bike carbs are pretty small, you don't have a real choke plate just fuel/air bypass that you have to get out and turn on and off, they don't like fuel pressure meant for gravity feed. The one I have is worth 400 bucks so its expensive and the acl pump has a small capacity you can increase that with Boysen products that's 125 bucks it just gets stupid. Big bucks were spent to make it work on a single cyl high rev motor and thats all it works on. Your putting a race carb on a tractor. Now a Harley carb thats different both VWs and Harleys dont rev for crap so much better match if your VW can rev your not using a harley carb. |
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Vanapplebomb
Samba Member
Joined: November 03, 2010
Posts: 5417
Location: Holland, MI
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| Posted: Wed Dec 28, 2022 8:20 pm Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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My favorite carb to drive off road is the SU HIF series of carbs. Amazingly stable off road at weird angles and rough ground. Doesn’t seem to care what angle it is tipped at as long as it isn’t completely on its side. My buddy had a rang rover with a 3.9 v8, originally fuel injected but converted to a Holley carb. I can’t remember if it was a two or four barrel, I think four. It didn’t like rock climbing and would flood out easy. Same with large jolts, like a sudden drops. He swapped it out for a factory 3.5 manifold and dual SU HIF6 carbs, and the difference was night and day. On the road the Holley was definitely more punchy when you have it a foot full, but dang those SU HIF carbs are nice driving carbs. Especially off road.
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1800 Type 4 Berrien 295
http://www.thesamba.com/vw/forum/viewtopic.php?t=487021 |
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DesertSasquatchXploration
Samba Member
Joined: April 16, 2021
Posts: 547
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| Posted: Wed Dec 28, 2022 8:38 pm Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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| My friends 1275 Mini had dual SU carbs made 143hp to the wheels with a aluminum head ported to the max actually cracked the head and had oil down the intake runners from the valve cover area welded it up made 123 still damn fast car. I believe the cheapest and most proven old school draw-thru turbo method is with a SU carby. They are getting very rare. $ going up and up for the real deal. 40MM SU carbs in the hundreds |
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Vanapplebomb
Samba Member
Joined: November 03, 2010
Posts: 5417
Location: Holland, MI
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Stormin189
Samba Member
Joined: February 14, 2018
Posts: 55
Location: Santaquin utah
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Wulfthang
Samba Member
Joined: August 25, 2018
Posts: 719
Location: Tucson
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| Posted: Thu Dec 29, 2022 10:00 am Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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| earthquake wrote: |
I have a couple of Keihin 40mm CV carbs off of Sportsters that I want to try on a NA VW, I thought about doing a single and duals. For a single it would not be hard to just make a elbow adapter to bolt one on a stock manifold.
eQ |
The Keihin's are a different type of carb than "normal" carbs. When you open the throttle, you're not really opening the throttle. You're just opening the flapper valve so that the carb itself can open the throttle. The throttle barrel...the round part that goes up and down..actually controls the throttle and it's controlled by the vacuum of the motor. You open the throttle flapper valve and that causes the carb to raise the throttle barrel.
They're actually very responsive on motorcycles if they're turned right. They don't need massive amounts of fuel injected by the accelerator pump because the throttle barrel..if tuned right will not raise faster than the engine can take it. You can slam that gas pedal down as hard as you want but the carb will not open up until it's ready to. The diaphragm in the top controls that.
I have no idea how well they work on offroad vehicles but on big street bikes, they're very nice. |
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Vanapplebomb
Samba Member
Joined: November 03, 2010
Posts: 5417
Location: Holland, MI
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| Posted: Thu Dec 29, 2022 2:45 pm Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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The throttle is just that, a throttle butterfly. Being a constant depression carb, the pistons function is to open/close in response to vacuum between the piston and throttle, and also raise and lower the tapered needle to meter fuel. The fuel metering is controlled by a tapered needle fitted to the piston. As the piston rises, the effective let orifice increases to allow more fuel to enter the air stream.
Constant depression carb: vacuum at jet constant, jet size variable
Traditional carb: vacuum at jet changes with air speed, jet size fixed
Genius design, CD carbs.
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1800 Type 4 Berrien 295
http://www.thesamba.com/vw/forum/viewtopic.php?t=487021 |
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Wulfthang
Samba Member
Joined: August 25, 2018
Posts: 719
Location: Tucson
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| Posted: Thu Dec 29, 2022 3:12 pm Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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All true! I ran a big set of Mikuni CV carbs on my Kawasaki street bike and loved them. They are harder to tune for modified engines than the old style because there are more variables...in addition to the main fuel jet, needle diameter and taper, you have to tune the main diagram spring and air jets too.
Keep notes on what changes you made so you can go back to "stock". They are very smooth and responsive and can make some serious horse power if tuned right. Truthfully though; I don't know how they work on larger vehicles and engines. On a five hundred pound bike with 180 horses, little changes make big differences. |
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Stormin189
Samba Member
Joined: February 14, 2018
Posts: 55
Location: Santaquin utah
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| Posted: Fri Jan 20, 2023 9:43 pm Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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Link
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joemama
Samba Member
Joined: February 09, 2006
Posts: 1636
Location: La Crescenta, California
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| Posted: Sat Jan 21, 2023 10:16 am Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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My friend has this in his yard.
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Stormin189
Samba Member
Joined: February 14, 2018
Posts: 55
Location: Santaquin utah
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| Posted: Mon Jan 23, 2023 9:44 am Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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| Those are pretty cool, do you know what kind of sidedraft they are, are they on single port heads? |
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Vanapplebomb
Samba Member
Joined: November 03, 2010
Posts: 5417
Location: Holland, MI
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| Posted: Mon Jan 23, 2023 10:14 am Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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Those are SU H or HS series carbs. You could probably get soMe good money for those from the vintage speed crowed! Although cool, those are not the SU carbs you want for off road. The ones you want for hard off road driving are the HIF series, specifically with the newer “stay up” float.
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1800 Type 4 Berrien 295
http://www.thesamba.com/vw/forum/viewtopic.php?t=487021 |
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earthquake
Samba Member
Joined: January 10, 2008
Posts: 3984
Location: SANDY VALLEY, NEVADA
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| Posted: Mon Jan 23, 2023 10:25 pm Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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| joemama wrote: |
My friend has this in his yard.
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Looks like there is a roller crank in that tub too.
eQ
_________________
74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
[From a military recruitment poster in the novel "The Stainless Steel Rat" By Harry Harrison] |
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joemama
Samba Member
Joined: February 09, 2006
Posts: 1636
Location: La Crescenta, California
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| Posted: Tue Jan 24, 2023 10:36 am Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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Wow. I didn't notice the crank. The carbs caught my eye, as I spent many a weekend, just out of high school, trying to figure out if my '68 MGB was running crappy due to the carbs, or the dual points.
Definitely old school stuff. |
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Bad_chopper
Samba Member
Joined: August 15, 2012
Posts: 295
Location: Portland, or
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| Posted: Sat Mar 04, 2023 9:41 pm Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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your putting Harley parts on a VW? that thing will never have oil in it. lol to habitual leakers put together =major oil leaker. cool idea though. should be neat if it you get it to work.
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my build page http://www.thesamba.com/vw/forum/viewtopic.php?t=536267 |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 12743
Location: Western Canada
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| Posted: Sun Mar 05, 2023 4:38 am Post subject: Re: Harley SS carb, draw thru Turbo 1641 |
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Yes it's been done before. A fellow who used to be here did it on his Baha Bug, I don't recall his name. Give me a few minutes...
Here you go.
https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0
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We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age) |
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