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Author Topic: INDIAN 741 Supercharged...See you in 2011  (Read 500814 times)
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Age: 61
Location: Copenhagen, Denmark
Posts: 522

Nimbus 750 APS-VBF

« on: April 08, 2009, 02:10:50 PM »

Hi ! Lars from Denmark Europe, here!

..haven't posted much since I signed up and introduced myself (here: CLICK and scroll down)

As I told back then; (I visited Bonneville / BUB last year as a member of the Dreamcatcher crew)

"....and wooops: right after I got home the voices in my head (couldn't help it)
told me to buy a frame and an Indian engine.
Unless something goes really wrong, you'll see me on that thing next year on the Salt.
It's not like "..I want to go there next year.."
nope: I have to!!!!!
..." I've waited a bit to introduce my project, till I actually had something
to show and convince you brilliant experienced lot, that I would 'walk the walk'.

So here it is; the result so far, after a billion hours of work,;
(..and a billion hours of more work to do)

The Salt Cracker INDIAN 741, 600cc Special Construction Class Vintage Supercharged Fuel  (650 A-VBF)
that will run ( if the gods of speed show mercy on my bike and my poor soul,) at this years BUB in August.

This is it's current state of 'advanced mock-up' a few days ago;
( engine  internals, but they are freshly rebuild and somewhat upgraded
and are all ready to be installed. In expect to do it right after Easter.)

Of cause the blower belt / intake arrangement is partly mock-up
but the engine-blower-drive itself is ready. As is the most difficult part to dream up;
the intake/plenum;

Yeah: I know; looks weird and big'ish, but there's an explanation for that;
the weird shape is because one want a large plenum or boost storage tank,
ideally around 150-200% of cylinder-volume, on a supercharger V-twin,
to 'even out' the  pumping action of the blower and the 'un-even' intake 'rythm',
according to all the clever old folk who did this back then.
This one is around 1200cc so pretty much spot on for this 600cc engine

The bikes configuration came about purely by 'accident':
Being and old romantic fart; I wanted to build an Indian.
Now big Indian engines are terribly expensive and I just happened
to stumble over this here (relativey) cheap small INDIAN 741 500cc engine (or more like: most of an engine)
and transmission. (They hardly ever come up for sale around here)
Here they are a few months ago:

Seamed to be in rather fair shape ....but ooops...look at the pistons:

...gotta be the worlds first 546,534 (or what ever) cubic-centimeters Indian engine ..ha ha.

At the same time a friend told about a frame for sale.
A "raw" ,never used, special frame made about 6 years ago, combining the beauty of the
gas-tank placed under the top-frame-rail and the possibility to install a 741 engine.
An INDIAN "101 lookalike", if you will.
Here it is a couple of weeks ago, when we made up the seat-'cowling'/rear-fender:

Now running an anaemic 60-something years old 500cc engine,
seamed kind of lame so decided to bore it to 600cc (plenty of material on the cylinders to do that)
and I just happened to have a small supercharger
from a small 600cc Japanese on it went to make things a bit more exciting.
More torque, and a high gearing / low engine-RPM's sounded like a good idea.
Nothing like high RPM's to kill an old engine.

Now a tuned supercharged engine makes a lot of heat (dangerously so)
and the decision was made to run on 'fuel' , in this case methanol, to cool things down.

So there it was; (running the BUB / AMA rules) a 650 A-VBF bike.
That means I run for a 'soft' (not set before) record.

Some will find that wussy.
Well; be my guest, call me a wuss.
I think it is very much in the spirit of Bonneville and in the spirit
of dear old Mr. Burt Munro, to drag a nearly 70 years old INDIAN across the globe, from another continent,
solely to run it on the Salt.

I'll post the progress on the bike here as I get things done
and look back to contemplate some of the problems, the solutions, the not-totally-stupid ideas
and the downright idiocy that brought the bike to it's current state.

Here's the vital info: 1940 Indian 741 engine
...bored to 600. New pistons
...totally rebuild with new or rebuild everything, from lifters
to bearings
...con-rods magna-flux tested for cracks and shot-peen'ed
...bigger exhaust valves
...small alterations of bearings
...slightly modified lubrication
...slightly modified crank-vent system
...blower drive running from crank (more on that later)
...seperate oil-tank fabbed inthich aluminum
...modified transmission bushes for better lubrication
...transmission rebuild with new bearings and
closed off from side-cover for separate lubrication
...300cc AISIN supercharger rebuild with new bearings etc.
...1 3/4 Rivara Eliminator SU carburettor frame. TIG welded construction, except for the cast steering head
and rear axle mounts (new reproduction 101 castings).
Seamless precision steel tubes, DIN 2391.
Cast reproduction fittings brazed as per original frames.
Engine plates are Duralumin

+ a million other small things. I can safely say that there's
not a single part n the bike that has not been worked over or replaced,
from the smallest washer in the engine, over rebuilding the blower... to new wheel spokes

Running gear:
...front end from a nineties Sportster . Lowered 2" and progessive springs installed
...front wheel; 21" costum off a Sportster as well (new Avon Spedmaster tire)
...rear wheel; 17" from a Suzuki 500T (rubber not decided yet)

...Tarozzi rear controls. Left side: foot-clutch. Right side: rear-brake
Gear-shifter; old-style hand shifter. Ignition advance in left-hand hand-control.
...ignition: 'total-loss' (no alternator) / Odyssey batteri / coil / 'electronic (contact-less) ignition
...gas-tank is cast (!!!) aluminum. Made by a friend as
a reproduction of the original Indian, one-year-only, cast tank.
Comes like his:

...then one has to polish/weld/finish and install filler-neck, fuel line etc. oneself.

Latest update:
we (that's me and my friend Kenneth who has devoted countless days and hours
to help me) made this rather funky, if I may say so, exhaust-pipes a couple of day ago:

Hope I haven't bored you silly with this long winding post.

Forgive me if my English is somewhat inapt; English is not my mother tongue
so I'll probably come off as a 9 year old retard from time to time.


From the bottom of my heart, and with humble gratitude I'd like to
profoundly thank the following great individuals, without whom this project
would never ever have had a snowman's chance in hell to become a reality:

...”Rocky” of  Dreamcatcher fame, and his brilliantly friendly
crew who accepted me as crew-member at last years BUB Bonneville event and sparked
my hidden inner Indian .-)
Thanks Rocky, thanks guys !

...”Moen” who runs Indian Parts Europe, for immeasurable help,
encouragement and willingness to patiently share his encyclopedic knowledge of all
things mechanic in general, and Indian-related in particular.
Thanks Moen !

...,”Kenneth” the brilliant Jack of All Fabricating Trades,
who at an early stage offered to spend a great chunk (and then some) of
of his spare-time helping me out, doing all the stuff I'm just too plain dumb to do;
alu-welding, fabricating stuff on the lathe and on the mill.
If I was paying the guy for what he's work is worth; he would be a rich man by now.
Thanks Kenneth !
« Last Edit: September 04, 2010, 08:34:19 PM by octane » Logged

"A designer knows he has achieved perfection
not when there is nothing left to add
but when there is nothing left to take away"

Antoine de Saint-Exupery
jimmy six
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Age: 74
Location: SoCal
Posts: 2543

« Reply #1 on: April 08, 2009, 02:31:42 PM »


First GMC 6 powered Fuel roadster over 200, with 2 red hats. Pit crew for Patrick Tone's Super Stock #49 Camaro
4-barrel Mike
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Age: 70
Location: Portland, OR
Posts: 2912

Any fool can drive a V8

« Reply #2 on: April 08, 2009, 02:47:56 PM »

Very cool.  Great English, too!


Mike Kelly - PROUD owner of the V4F that powered the #1931 VGC to a 82.803 mph record in 2008!
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Posts: 605


« Reply #3 on: April 08, 2009, 03:29:19 PM »

 grin Outstanding Build  cheers I love the old stuff!

Each unexpected discovery is first ridiculed, then objected to and finally considered self evident
#4836 A-PBF 750cc(complete)
#765 A/G 650cc
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« Reply #4 on: April 08, 2009, 04:02:14 PM »

Absolutely beautiful!   grin

It always amazes me that some of these bikes are works of art in addition to being fast, so here is to you going fast!   cheers
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Age: 61
Location: Modesto,California
Posts: 517

« Reply #5 on: April 08, 2009, 04:08:31 PM »

Awesome bike Lars..
Can't wait to see it on the salt. Good luck and ride safe.

Sheri Buchta
Dakin Engineering
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Age: 60
Location: Kansas City
Posts: 364

« Reply #6 on: April 08, 2009, 08:14:05 PM »

I like the way you think.

Good job!

Turbo Sportsters since '97
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Online Online

Location: Mammoth, Az. Where the sun shines daily!
Posts: 821


« Reply #7 on: April 08, 2009, 08:24:06 PM »

Lars!!  Now you have me looking at my old 57 rigid framed, 62 Pan bottom end, 66 Shovel top end street bike with a slightly different attitude!  Beautiful machine...will see you at BuB  meet!    Crow

The Earth, is an intergalactic insane asylum.!
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Age: 87
Location: Everett, WA - USA
Posts: 5415

« Reply #8 on: April 08, 2009, 08:25:14 PM »

There is plenty of room for you in this build diary.

You and your project are OUTSTANDING.

Don't be a stranger.


Since '63
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Age: 65
Location: Outback Australia
Posts: 401


« Reply #9 on: April 08, 2009, 08:37:48 PM »

That's BEAUTIFUL Lars ! grin

Tiny (in OZ)
I would prefer to make horsepower, rather than buy, or hya it, regardless of the difficulties involved , as it would then be MINE
Brian Westerdahl
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Location: Brewster Washington
Posts: 271

« Reply #10 on: April 08, 2009, 08:47:51 PM »

Fantastic, Very Nice
Dr Goggles
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Location: Melbourne Australia
Posts: 3051

The Jarman-Stewart "Spirit of Sunshine" Bellytank


« Reply #11 on: April 08, 2009, 09:16:45 PM »

....just gorgeous, good writing, beautiful pics, great attitude....COOL BIKE!!!!!!!!!

Few understand what I'm trying to do but they vastly outnumber those who understand why...................

Current Australian E/GL record holder at 215.041mph

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Location: Bakersfield, CA
Posts: 686

When all else fails, gas it!

« Reply #12 on: April 08, 2009, 09:19:01 PM »

Beautiful, just beautiful.  cheers

Larry Cason
Bakersfield,CA    It's a dry heat!

2010 BUB 1350 M-PG record
2012 Speedweek  1350 A-PG record 169.975
2014 El Mirage Dry Lake  1350 A-PG  172.651
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Posts: 774


« Reply #13 on: April 08, 2009, 09:53:46 PM »

« Last Edit: October 03, 2010, 09:30:13 AM by panic » Logged
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« Reply #14 on: April 09, 2009, 12:17:16 AM »

I agree, that is a work of art and beautiful.  Keep posting pics, even a car guy like me appreciates what you are doing.

I used to have a handle on life, but it broke.....

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