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joes50pu Samba Member
Joined: March 29, 2009 Posts: 4 Location: yuba city california
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Posted: Sun Apr 18, 2021 11:22 am Post subject: Old vw power adder |
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I purchased this old pulley driven power adder yesterday and looking for Any any information about it.
Thank You!
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FarmerBill Samba Member
Joined: July 25, 2017 Posts: 762 Location: New England
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Posted: Sun Apr 18, 2021 1:03 pm Post subject: Re: Old vw power adder |
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G.E.M. made stacks for go-kart/motorcycle carbs. What's the diameter of that carb? I'm guessing that's off a racing kart or motorcycle. Maybe a snowmobile. That looks like it might be an old Tillotson carb. |
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joes50pu Samba Member
Joined: March 29, 2009 Posts: 4 Location: yuba city california
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Posted: Sun Apr 18, 2021 2:14 pm Post subject: Re: Old vw power adder |
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I just found out from a friend of mine that a friend of his has this setup on a 58 vw.
The carburetor is a TILLOTSON HR 30 A
I will try to post a picture of the back side. The rotary bearing caps have vw Aluminum seal covers....very cool. |
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FarmerBill Samba Member
Joined: July 25, 2017 Posts: 762 Location: New England
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Posted: Sun Apr 18, 2021 2:32 pm Post subject: Re: Old vw power adder |
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That "power adder/blower" looks like a Porsche 912 smog pump. Not conventional but it might work on a 36hp. Harley used a Tillotson carb similar to that on the shovelhead, and they were about the same displacement as a 50s VW. |
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FarmerBill Samba Member
Joined: July 25, 2017 Posts: 762 Location: New England
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Posted: Sun Apr 18, 2021 2:58 pm Post subject: Re: Old vw power adder |
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Just looked it up, and that carb is stock equipment for late 60s early 70s Rupp and Ski-Doo snowmobiles. It took two of them to run a 600-750cc two stroke one for a 250cc. Sachs also used one on a 290cc single cylinder. I remember these carbs because a friend of mine had an old Ski-Doo 250 with one of these. It was conveniently pointed right at the rider so you could shoot starting fluid down its throat while you rode. |
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FarmerBill Samba Member
Joined: July 25, 2017 Posts: 762 Location: New England
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joes50pu Samba Member
Joined: March 29, 2009 Posts: 4 Location: yuba city california
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Posted: Sun Apr 18, 2021 4:18 pm Post subject: Re: Old vw power adder |
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joes50pu Samba Member
Joined: March 29, 2009 Posts: 4 Location: yuba city california
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Posted: Sun Apr 18, 2021 4:21 pm Post subject: Re: Old vw power adder |
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This is the back of the power adder. So its vw. It bolts to the intake. My friend told me he knows someone who is running this exact setup on his 58 Bug. |
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FarmerBill Samba Member
Joined: July 25, 2017 Posts: 762 Location: New England
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Posted: Sun Apr 18, 2021 5:07 pm Post subject: Re: Old vw power adder |
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I think it’s more likely that this carb, blower/smog pump setup was put together for a motorcycle or go-kart. To get more than a pound or two of boost on a 1200 cc motor, you would have to be spinning that tiny smog pump at 15,000-20,000 rpms at 3500rpms engine speed, and even then you would choking the engine with that tiny carb. I’m currently building a 59 engine with an AMR 300 blower, that’s probably twice the size of that smog pump, and at a 2.7:1 drive ratio I’m only expecting to get around 6 or 7 pounds of boost.
The main thing is that carb, it’s just too small to run a 1200cc or larger engine. I don’t doubt you could get that smog pump to run on a 36hp, but not with that carb, and even then any power gains would be meager at best. |
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Erik G Samba Member
Joined: October 16, 2002 Posts: 13247 Location: Tejas!
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Glenn Mr. 010
Joined: December 25, 2001 Posts: 76764 Location: Sneaking up behind you
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Posted: Wed Apr 21, 2021 8:54 am Post subject: Re: Old vw power adder |
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Erik G wrote: |
no matter how much you want to call it a power adder, it is not. it's a smog pump from the 70's |
Don't forget the electric superchargers. _________________ Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
#BlueSquare |
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FarmerBill Samba Member
Joined: July 25, 2017 Posts: 762 Location: New England
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Posted: Wed Apr 21, 2021 5:43 pm Post subject: Re: Old vw power adder |
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Yep, no such thing as a free lunch. However, I bet that thing would make a 200-300cc a bit more peppy. |
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janerick3 Samba Member
Joined: June 04, 2006 Posts: 1879 Location: Colorado
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Posted: Fri Apr 23, 2021 3:47 pm Post subject: Re: Old vw power adder |
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Looks like somebody got creative with a couple of 80mm gas caps. _________________ Thanks,
Jan K. |
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Abscate Samba Member
Joined: October 05, 2014 Posts: 22575 Location: NYC/Upstate/ROW
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Posted: Sat Apr 24, 2021 4:46 am Post subject: Re: Old vw power adder |
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You can double your HP by putting your fan shroud hoses direct into your carb _________________ .ssS! |
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