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vwsteve
Samba Member
Joined: March 18, 2004
Posts: 1047
Location: Virginia
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 Posted: Fri Mar 14, 2014 9:43 am Post subject: Fuel Injection to Carb conversion |
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I would like to convert from FI to a single carb on a 75 1800. I would prefer to use a stock type 1 carb. Has anyone tried this? What did you do for a manifold? I know I will loose power, but I am not concerned about that.
Please don't start a debate about FI being better. I also don't want to go to dual carbs. I have a progressive weber for a type 1 that I think I can buy a manifold for to make work, but I would prefer a stock solex if possible. |
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stuming
Samba Member
Joined: August 10, 2010
Posts: 257
Location: London, UK.
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| Posted: Fri Mar 14, 2014 11:14 am Post subject: |
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No takers?!!
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donemoto
Samba Member
Joined: March 01, 2004
Posts: 501
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| Posted: Fri Mar 14, 2014 11:25 am Post subject: |
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If using a type 1 Solex for a 75; keep your runners from the fuel Injection and build a manifold box similiar to the one you've taken off. You will need to braze a intake manifold boss to connect the Solex carb. Then rejet,....rejet.
The easisest way would be to put Dual carbs from a 7-74 on it .
_________________
1975 Campmobile
1962 Bug Convertible
Homebuilt VW Trike
1966 HD Sprint H
1940 HD ULH Flathead
1985 Electra-glide Classic with Tour-Pac
1968 Harley Rapido
1968 Honda CL Scrambler 175cc
1962 Honda Cub 50 Step-thru
1980 Honda Cub 70 |
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Randy in Maine
Samba Member
Joined: August 03, 2003
Posts: 34890
Location: The Beach
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borninabus
Samba R&D Dept.
Joined: May 18, 2006
Posts: 4536
Location: Arizona Highways
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| Posted: Fri Mar 14, 2014 11:42 am Post subject: |
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if my goal was the same as yours, OP i would look into the single carb set up used on euro market Vanagons.
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88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport |
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vwsteve
Samba Member
Joined: March 18, 2004
Posts: 1047
Location: Virginia
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| Posted: Fri Mar 14, 2014 12:05 pm Post subject: |
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How is it any different from the kit that includes a weber progressive and manifold? |
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Wildthings
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Joined: March 13, 2005
Posts: 50334
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| Posted: Fri Mar 14, 2014 12:12 pm Post subject: |
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You could search up a manifold for a single carb T127 and use that with an adapter. You would have to fab a port into your muffler as a hot air source for the manifold heat, not really a big deal to do.
You could also build the carb manifold starting with FI manifolds as I did for my progressive. There is heat under the manifold, plus the center section is double walled so it is totally surrounded by hot exhaust gases. In my opinion the heat around the center section is more important than the heat under the runner. A carb can be very dependable, but setting it up right is a lot of work compared with maintaining the stock FI.
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Randy in Maine
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Joined: August 03, 2003
Posts: 34890
Location: The Beach
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| Posted: Fri Mar 14, 2014 12:26 pm Post subject: |
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| vwsteve wrote: |
How is it any different from the kit that includes a weber progressive and manifold? |
Gee I don't know. That set up is for a Type 1. You could likely fab up something that would sort of work if you could duct through some exhaust heat sort of like how Wildthings suggests.
Personally I would just use dual carbs as it would be easier and better since they do not require the heat, but you are the one that want to use a single centermounted carb. |
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vwsteve
Samba Member
Joined: March 18, 2004
Posts: 1047
Location: Virginia
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| Posted: Fri Mar 14, 2014 12:54 pm Post subject: |
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| Oh ok, I thought they sold it for a late bus engine also. |
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vwsteve
Samba Member
Joined: March 18, 2004
Posts: 1047
Location: Virginia
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| Posted: Fri Mar 14, 2014 12:55 pm Post subject: |
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| Oh ok, I thought they sold it for a late bus engine also. |
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madmike
Samba Member
Joined: July 11, 2005
Posts: 5292
Location: Atlanta,Michigan
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| Posted: Sat Mar 15, 2014 5:54 am Post subject: |
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Long runners to the heads= fuel falls out suspension as in less atomazation(spelling)= one fucked up running bus
Get duals 
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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donemoto
Samba Member
Joined: March 01, 2004
Posts: 501
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| Posted: Sat Mar 15, 2014 5:12 pm Post subject: |
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| Wildthings wrote: |
You could search up a manifold for a single carb T127 and use that with an adapter. You would have to fab a port into your muffler as a hot air source for the manifold heat, not really a big deal to do.
You could also build the carb manifold starting with FI manifolds as I did for my progressive. There is heat under the manifold, plus the center section is double walled so it is totally surrounded by hot exhaust gases. In my opinion the heat around the center section is more important than the heat under the runner. A carb can be very dependable, but setting it up right is a lot of work compared with maintaining the stock FI.
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Yep, those look like all the butcher jobs I've seen in the 80's.  Look nasty; but, run great for a year or two.
_________________
1975 Campmobile
1962 Bug Convertible
Homebuilt VW Trike
1966 HD Sprint H
1940 HD ULH Flathead
1985 Electra-glide Classic with Tour-Pac
1968 Harley Rapido
1968 Honda CL Scrambler 175cc
1962 Honda Cub 50 Step-thru
1980 Honda Cub 70 |
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babysnakes
Samba Member
Joined: August 19, 2008
Posts: 7106
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| Posted: Sat Mar 15, 2014 5:18 pm Post subject: |
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This looks like a genuine PITA. What's the point? To say "I did it."? I'm cheap but.... |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50334
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| Posted: Sat Mar 15, 2014 9:11 pm Post subject: |
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| donemoto wrote: |
Yep, those look like all the butcher jobs I've seen in the 80's. Look nasty; but, run great for a year or two. |
This was my second iteration, the first was done around 1988-89 and only heated the bottom tube while this one that heats the bottom tube and the plenum area dates from 1990-91. Been pretty danged dependable. I have wanted to build a stainless steel center section as I have always been concerned that the condensate in the exhaust would cause rust through into the intake, but so far this hasn't happened.
It only took a few hours one evening to build so it really wasn't much of an investment in time especially considering how long is has lasted.
FWIW the whole long cold runner and fuel drop out thing is mostly ignorant BS. Any fuel mixture that leaves the carb also enters the cylinders at pretty much the exact same AFR. With some manifold designs fuel might pool in the center seciton but it will never pool in the runners no matter how long and cold they might be. |
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tristessa
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Joined: April 07, 2004
Posts: 3992
Location: Portland, OR
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| Posted: Sat Mar 15, 2014 11:44 pm Post subject: |
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| babysnakes wrote: |
img]https://www.thesamba.com/vw/gallery/pix/620046.jpg[/img]
This looks like a genuine PITA. What's the point? To say "I did it."? I'm cheap but.... |
That's a stationary industrial engine, designed & intended (BY VW!) to run for hours at a consistent RPM. No point dicking with dual carbs or fuel injection for that usage, a single carb works just fine.
Every piece of it has a VW part number somewhere... |
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madmike
Samba Member
Joined: July 11, 2005
Posts: 5292
Location: Atlanta,Michigan
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| Posted: Sun Mar 16, 2014 4:57 am Post subject: |
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What a hack job  go ahead and run a POS progressive,and let us know how that works 
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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grtfldan
Samba Member
Joined: December 06, 2007
Posts: 141
Location: Maryland
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| Posted: Sun Mar 16, 2014 5:47 am Post subject: |
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Ill take the old useless FI stuff if its just getting in the way.
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79 Bay 2.0 Fuel Injection
79 Bay project |
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Randy in Maine
Samba Member
Joined: August 03, 2003
Posts: 34890
Location: The Beach
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| Posted: Sun Mar 16, 2014 8:07 am Post subject: |
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If it were me I think I would likely buy this little set up...
http://www.thesamba.com/vw/classifieds/detail.php?id=999759
Or this one depending on how the cash flow is....
http://www.thesamba.com/vw/classifieds/detail.php?id=1592953
Once you get the carbs installed with no vacuum leaks and a good linkage set up, there really is little need to dink with them on a regularr basis as they will stay pretty much in "tune". A suitable distributor will help keep the engine in pretty good tune also. Be sure to measure your fuel pressure as it enters the carb(s). Most carbs like about 2 -4 spi.
I would avoid those center mounted progressive carbs as they are a nightmare to tune and even when they run well they are still just a bad set up. The only one I ever saw that worked pretty well required weekly "dinking" and the owner was a pretty good tuner by the end. He eventually went to dual italian weber 40 IDFs and said he should have done it a long time befroe he did, but that cost him about $600 a long time ago.
Just my 2 cents. |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50334
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| Posted: Sun Mar 16, 2014 9:21 am Post subject: |
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| madmike wrote: |
| What a hack job go ahead and run a POS progressive,and let us know how that works |
250K miles and counting at this point and it still runs just fine. |
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madmike
Samba Member
Joined: July 11, 2005
Posts: 5292
Location: Atlanta,Michigan
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| Posted: Mon Mar 17, 2014 3:48 am Post subject: |
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You'r Lucky I think you got the one out of ten that works
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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