Mercedes-Benz Forum banner

1 - 8 of 8 Posts

·
BenzWorld UNIMOG statesman
Unimog 404.1 Diesel (sold :( )1995 LMTV 1078
Joined
·
5,856 Posts
Discussion Starter #1
This is info on reflection of a mystery holley carb being sold on Ebay for Mog 404's. Thought it would be good info for someone to research further. Will help out lots of folks.

Repeat from Mail list

Hello to all,
Personally, I am very curious about this Holley carburetor conversion. It appears to be most likely a Model 2280 or Model 6280.

http://www.carburetorfactory.com/expvw16.html

Unfortunately, none of my three Holley reference books list the CFM values for these carburetors. I have asked the seller for this information. While I may not need to know the model of the carburetor, I certainly would want to know its CFM rating before I would spend a dime on a carburetor. According to the following source, the 2280 and 6280 carbs were used on engines from 3.9 liter to 5.2 liter displacement.

http://www.holley.com/Reman/DomCarb/DodgeTrk.html
yet the following site lists 2280 CFM anywhere from 184-340 CFM.

http://www.mergetel.com/~fraso/RasoEnterprises/Carburetion.htm

Ideal flow rate for a stock M180 engine is around 194 CFM with 100% volumetric efficiency. Realistic flow rate may be as low as 146 CFM. The Haynes Techbook #2069 does have a nine page chapter in the 2280/6280 carburetor series including exploded diagrams. These carburetors have many of the features that make the Zenith 32NDIX so popular as well as some improvements including a very nice float bowl baffle.

I have looked at the eBay photos and know that the carburetor in question is not the Holley 2110 Bug Spray of old. For an example of the old Bug Spray, take a look at:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem
<http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7960228032&category=33550> &rd=1&item=7960228032&category=33550

For those interested, the Bug Spray was Holley's answer to the early VW off-roaders use of the Zenith 32 NDIX. The bug/buggy drivers were not aware of the use of the same carburetor on the Unimog 404. Rather, this was a carburetor used on the early Porsche 356 cars in a dual carburetor configuration and was better the little Solex single barrel carburetors. Porsche used a pair of Solex carburetors on later 356 cars because they were thought to be.better. Carter also produced a Zenith 32 NDIX alternative. The Bug Spray was available in both 200 and 300 CFM versions. The air horn and base share the exact same dimensions as the 32NDIX.

There is nothing significantly wrong with the stock Zenith 32NDIX but it is not perfect. In 1955, it was the best off-road carburetor available to easily fit the intake/exhaust manifold borrowed from the MB 219 sedan with its very early M180 motor running a single two barrel Solex PAATJ carburetor. But one must admit that, if the 32NDIX was "perfect", it would not have
faded from the general off road scene so long ago. Even AutoUnion/DKW further modified their Zenith 32NDIX on the MUNGA by extending the float camber vent 2" above the upper edge of the air horn.

http://pg.photos.yahoo.com/ph/jim_molloy3/album?.dir=bce3<http://pg.photos.yahoo.com/ph/jim_molloy3/album?.dir=bce3&.src=ph&store=&prodid=&.done=http%3a//pg.photos.yahoo.com/ph/jim_molloy3/my_photos>&.src=ph&store=&prodid=&.done=http%3a//pg.photos.yahoo.com/ph/jim_molloy3/my_photos

That small vent tube screws directly into the threaded bung in the vent crossbar and prevented spillage of gasoline through the vent and less
radical angles. Imagine that: an improvement on the "perfect" carburetor that was never included on the Unimog. My biggest disappointment with the stock 404 carburetor was its constant leakage. Having gone through several used and no less than three NOS carburetors from two separate very reputable dealers and using fresh gaskets, I grew tired of the frequent leaks. I recall a post on this list back around 1997 when someone advocated solving the constant weeping problem by spraying the entire external surface of the
Zenith with Varathane.

I would like to see something new for the 404 fuel delivery system just as I applaud the Pertronix in the standard 404 distributor, new tread patterns over the original NATO tires, and other product enhancements. I am certainly not sure the offering on eBay is the right way to go but it just might be.

We shall see. Take care.

Jim Molloy
Waldersee Farm
http://www.northwestmogfest.com <http://www.northwestmogfest.com/>
 

·
Registered
mogless, except for my friends MB4-94. And a bunch of other diesel junk.
Joined
·
2,512 Posts
RE: HOLLEY Carb. for a mog 404

looks an awfullot like the holley replacement carb that was on my 66 chevy truck, single barrel on a 327 as I remember. I don't think it was orig to the truck, but I had to rebuild it at one point. Displacement is close to the 180 so it should have adequate cfm... Seth
 

·
Registered
Unimog_404.113_1970
Joined
·
178 Posts
RE: HOLLEY Carb. for a mog 404

i saw that carb. on eBay too ...

i cant see why anyone would change one carb. for another ...
the carburator has faults by design, such as the
compromise of fuel delivery ..

the EFI are 10 times better than any carb. (if you doesnt count
in the electronics needed, for those of you who like simple "non-electronic" things) ..

when i have the time and money i will equip my Unimog
with MegaSquirt (http://www.msefi.com), a DIY EFI which is simple to build,
and easy to map ... i dont know if there are any Mercedes
engines from that time that had EFI, i just know of the
mecanical injection, so i guess i´ll have to build
a new intake manifold, with bosses for the injectors,
but the extra work is definetly worth it!
 

·
Registered
404.s x VW-Lt
Joined
·
189 Posts
RE: HOLLEY Carb. for a mog 404

Hey Fizz,

thx for that link. Maybe it is some use for me. I want to run liqified propane on my m180 with a propane mixercarb in front the (to be mounted)turbo. Ideal setup would be propane injection (G3 installation) as they use here on modern cars. better km/liter and response on the throttle. it also would fix the problem of blowing the turbo with the propane blown/sucked trough it. I will see at the local USAcar scapheap if i can get hand on a LPG injectionset.
 

·
Registered
Unimog_404.113_1970
Joined
·
178 Posts
RE: HOLLEY Carb. for a mog 404

volksmog - 3/11/2005 10:04 PM

Hey Fizz,

thx for that link. Maybe it is some use for me. I want to run liqified propane on my m180 with a propane mixercarb in front the (to be mounted)turbo. Ideal setup would be propane injection (G3 installation) as they use here on modern cars. better km/liter and response on the throttle. it also would fix the problem of blowing the turbo with the propane blown/sucked trough it. I will see at the local USAcar scapheap if i can get hand on a LPG injectionset.
if you want to now more about MegaSquirt, feel fre
to send me a PM, or start a new tread about it ...
I dont now everything, but i´ve read alot, and can
probably answer some of your questions ...[;)]
 

·
BenzWorld UNIMOG statesman
Unimog 404.1 Diesel (sold :( )1995 LMTV 1078
Joined
·
5,856 Posts
Discussion Starter #7
RE: HOLLEY Carb. for a mog 404

CFM responce from the Ebay seller

This is the information sent by the seller.

You asked: "What is the CFM rating for this carburetor"?

As this is not a true aftermarket only carb, the carb is rated as to origional application. The carb is good for 300-400 cfm and can use the higher rating if propperly jetted and needled. I have tested this carb and it flows more than the required 234cfm at 100% of intake at 3000 rpm on a m180 2.2ltr as to the zenith specs. Kris Heikkila
 

·
BenzWorld UNIMOG statesman
Unimog 404.1 Diesel (sold :( )1995 LMTV 1078
Joined
·
5,856 Posts
Discussion Starter #8
RE: HOLLEY Carb. for a mog 404

Another updare from Mark on da mail list.

Hello

I have been in constant communication with 'Kris', the seller of the product. His latest comments:

"It's not a Holley ....REBUILT by holley. MFGD BY Carter I live in Mason NH .....Southern central part of the state. I can just about smell Mass from here( 2 miles away) Steep incline testing will be done at the gathering in April when the
snow melts."
"Kris"

Mark
 
1 - 8 of 8 Posts
Top