Lights, Carb & Tires

[sarmadq]

Hi all, some more freaked out pictures of another decommissioned Pak-Army MUTT. (In April '08 we had 70 of these in 1 city only for auction & I believe there are 5 auction sites across the country)

Check out the projection lamps, the extended Carb & the Yokos rubber.

Seems to me he has an HID kit installed


The carb is extended out further, fail to understand why.


Yoko Geolandars are his choice with a set of CJ7 cobra heads


Oh & he has a carpeted floor too

[Rainman]

Of all the mods, I actually like the fender flairs. Making them removable would be nice, but with a wider set of tires, they would function very well. Gives it that FAV flavor to the fenders, but cleaner.
Rainman

[sherwan_88]

Yeah...Mee too like those flares....this mutt looks like its on heroin..lol... I mean this in a good way and not sarcastically.
Though i'm concerned is the mutt easily steerable with those big a"s tires?

[Rainman]

Hey Sherwan,
You mean like it's turn signals turned red, and it's got those big dilated pupil er headlights?
Must have pawned it's shackles for a fix man.
Rainman

[sarmadq]

Sherwan:
I dont think turning would be a problem here. FAVs had similar wheels & I'm sure if there was any problem they wouldn't have come up with them.

Try out by putting your Patrol wheels on the MUTT.

[Horst]

He put a downdraft carb in that thing. That's why the setup is as it is. Another good way of getting rid of that working but low standards Zenith.

[sherwan_88]

Yeah, the head lights

Sam,
The Patrol wheels don't fit, Mutt is 5 Nut and the Patrol is 6 Nut. The thought has crossed my mind.

[sarmadq]

Hmmmm ....... would those of a Civic fit I guess the space difference won't allow

[sherwan_88]

Civic is 4 Nut
opps! the new one's are 5! my bad

[rickf]

I especially like the carburetor, gives me ideas.

Rick

[sarmadq]

Rick, what's the basic of the down draft carb ? What difference does it make to the Zeniths

[rickf]

As far as theory of operation the are exactly the same. All carburetors do one thing and one thing only, They atomize fuel in the proper air/fuel ratio across the operating band. Some are better than others at doing this. A side draft carb is actually a better setup for an inline engine because it gives a straight shot into the cylinders whereas a V8 or V6 the intakes are on the top and a downdraft is better. We do not have many side draft carbs in the US except for outboard boat engines and motorcycles. Mutt engines are very limited airflow wise not so much by the carburetor but very much so by the exhaust manifold setup. I really like the exhaust setup that was designed years ago by Mutt motorpool but he no longer does it.


Rick

[sherwan_88]

Mind if i chime in....

Rick,
One thing which bugs me is, that if a carb is built for a specific size engine, lets say 1.0L engine, and one mates it with the mutt 2.4L. Won't the carb be injecting lesser fuel into the cylinders because it is actually injecting fuel for a 1l engine into a 2.4l? Simply, won't the engine run leaner?

[Horst]

Sherwan, you are almost right. A carb needs to be fitted to the engine size. What counts is actually the flow, in US terms that is measured in cubic feet per minute (for example). If the carb is too small, you will just not get enough air (or fuel/air) thru the engine. Obviously you will need the largest amount of air pumped thru the engine at full throttle and max rpm. So if your carb is too small, you will not be able to produce enough power. It still will produce the correct air/fuel mixture as defined by the jetting of that carb. As a MUTT engine does not rev very high, it probably can get along with a carb which was designed to be used for a smaller , more modern, engine (but higher rpms). Now this is a simplified view, because taking a too big carb also reduces engine performance which cannot be explained by this reduced explanation. It needs to also fit to the type of cam used. On my GTO I have a 750cfm carb, but that's because I have a radical cam, a smaller cam would be much happier with a 600cfm carb (just an example).

As Rick said, downdraft carbs are more widely used in the US, there are a some European cars with side draft carbs, like on some British engines.

[rickf]

Horst hit it pretty much on the head. There are other terms which come into effect mainly VE which is volumetric efficiency. It is a fancy term meaning how much of the air fuel mixture is actually converted to usable energy. This varies greatly from engine to engine. Most are around 70 to 80 percent. the newer injected engines are closer to 90% with diesels around 95%. The Mutt would fall in around 60%.


Rick