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steve_blackbob

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Post Thu Dec 21, 2006 2:39 pm

back to the old carb topic

finally settled on using an amal monobloc on my 57" SS motor, I have had a manifold adapter made up with a long stub which can be shortened as required, using a mk2 amal adapter the Monobloc will then fit easily using a rubber sleeve mount.

Spoke to Surrey Cycles the UK Amal specialist and told them I wanted a 1.25" amal monobloc to suit a 960cc sidevalve V twin and he seemed confused, he reckons it would run better using a much smaller carb, possibly a 1" or smaller

any suggestions?
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ironwigwam

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Post Fri Dec 22, 2006 3:40 pm

Steve,
Why not Linkert or Schebler?
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steve_blackbob

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Post Fri Dec 22, 2006 3:54 pm

finding the right carb at the right price in this part of the world aint that easy,

do you have anything in stock that would suit?
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panic

Post Fri Dec 22, 2006 6:34 pm

Last edited by panic on Tue Dec 26, 2006 7:17 am, edited 1 time in total.
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ironwigwam

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Post Sat Dec 23, 2006 8:57 am

Steve,
Any of the Linkert carbs that end with a 1. ie" M-21- M-11, M-31, M-41, M-51, M-61" will give you Bonneville carb results at a lesser cost most guys by pass these by never realize the nozzle sizes are real close to what is used on the Bonneville scouts by the factory.
Rocky
1957S/VG
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panic

Post Sat Dec 23, 2006 9:12 am

Last edited by panic on Tue Dec 26, 2006 7:16 am, edited 1 time in total.
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steve_blackbob

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Post Sat Dec 23, 2006 10:16 am

just to add to the confusion, I was looking at Dell'orto PHB carbs in the Wand W catalogue, I have had successful results with these on triumphs, any body used them on a SS ?
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ironwigwam

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Post Tue Dec 26, 2006 5:08 am

Panic,
Maybe I misunderstood the question, but I thought we were looking at Linkert alternatives that didn't cost an arm and leg as such the CORRECT Indian Linkert numbers bring.
Yes some are ome inch, perfect for fitting an individual carb to a single cylinder. Yes some are bigger but I think even you agree that adapters can be made if on a limited budget to fit a 4 bolt to three bolt. I think there is even a book that shows you how?
Every Bonneville Schebler carb that I have in my possesion prior to Linkerts being used on Scouts all used the 1 1/16 venturi in the standard scout 1 1/8 carb with modified nozzle sizes as well.
These Linkert numbers will work for stroker engines, although not politically correct.
My opinion for all other carbs only counts to me, but personally we are dealing with a sidevalve and not an OHV

Rocky
1957S/VG
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panic

Post Tue Dec 26, 2006 7:15 am

Last edited by panic on Wed Dec 27, 2006 8:44 am, edited 1 time in total.
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steve_blackbob

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Post Tue Dec 26, 2006 2:21 pm

didnt mean to open a can of worms here :shock: really I am looking to use an easily sourced alternative to the Linkert, I can get hold of Amals, SU's and Dell'orto's, I also have more experience with them. Good condirtion Linkerts are not easy come by in this part of the world and rebuilt ones of suitable type get very pricey.... there also seems to be quite a lot of argument as to the most suitable one for the engine I have.

I have to admit to not being that well versed in Indian, or indeed Flathead lore, having been brought up on a diet of Triumph twins and BSA singles.I still get confused by the fact that my 1922 sv JAP 750cc motor came with a 7/8th " Amal carb as standard and a 500cc Indian SV v twin uses an 1 1/4" Linkert :?

Anyone here ready to educate me?
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Cotten

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Post Tue Dec 26, 2006 6:23 pm

Steve!

Here's what I've learned about carbs so far:

There are no bad carbs.
Just badly worn or over-complicated ones.

Just about anything can be made to run.
But you may wish to throw more money at it anyway.

Your money will always be best spent to choose the model of carb that your machine was produced with. If you intend to keep your machine for many years, it will most likely end up with just that, no matter how many 'performance' units you enjoy in the meantime.

Which is delightfull, if you like tuning exercises.

Please tell us what year of Sport Scout you have!

....Cotten
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Limey_Dave

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Post Tue Dec 26, 2006 11:40 pm

Steve.

I would think the Amal would pass more air for the bore size.With the slide wide open you only have the needle in the air flow.

With the Linkert wide open you have the venturi reducing the 1& 1/4 (1.25") down to 1& 1/16 or 1& 1/8 .

In the airflow you also have 2 spindles,the knife edge of 2 discs plus their retaining screws and the fuel tube sticking up in the middle.

If you added up the total cross sectional area of that lot your 1& 1/4 nominal bore is prob down to 1 inch or less.

Like you I've only done Brit iron before but now got into V twins.I would go with a Linkert (even if not the correct one to start with) you can mix & match parts just like the old Amals.As with the V twin engines I've found it a breath of fresh air and I'm fired up like I haven't been for a long time.

Get the Victory Library Linkert book and have a play.There's loads of spindles,discs and bushes out there NOS or repro from 45 Parts Depot.
Just steer clear of M88's and vented venturi (you'll box your self into a corner.)

Just as a taster ebay item #190063821695 about 12 hrs to go £52.38 +
£14.21 air mail.At those prices you prob wont pay any duty or vat,postie will bring it right to your door.


Sorry lads,don't know what came over me,but I feel better now. :oops:


NOTE to Bill Gates.Never mind XP & VISTA, give me a keyboard with fractions.
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ironwigwam

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Post Wed Dec 27, 2006 5:09 am

I found this scout engine skeleton on my shelf and I think it could use two one inch carbs? Not sure ? Can someone help me? It appears to have 80inch chief flywheels in the same box? So it would be a scout stroker?
As a side note it does not use a chitzy two carb shoe maker adapter but rather hand made cylinders,
Rocky
1957S/VG
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steve_blackbob

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Post Wed Dec 27, 2006 5:32 am

want it ! :twisted:

so how much would it cost for me to have it on my shelf??
Last edited by steve_blackbob on Wed Dec 27, 2006 12:49 pm, edited 1 time in total.
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steve_blackbob

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Post Wed Dec 27, 2006 12:45 pm

Cotten wrote:
Please tell us what year of Sport Scout you have!

....Cotten


Hi Cotten,

Its a bit of a special being, a set of 1942 Sport Scout cases and cylinders stroked with chief bottom end. I bought it as built with a front frame section and some other rolling stock

here is a link to my webpage for more detail http://www.achnasheen.uk.com/indian.htm

Steve
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steve_blackbob

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Post Wed Dec 27, 2006 12:48 pm

Limey_Dave wrote:Steve.


Just as a taster ebay item #190063821695 about 12 hrs to go £52.38 +
£14.21 air mail.At those prices you prob wont pay any duty or vat,postie will bring it right to your door.



NOTE to Bill Gates.Never mind XP & VISTA, give me a keyboard with fractions.


went for $280 ......... ouch, could buy a new Amal for that!

thanks for the carb lesson, makes more sence now :D
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Limey_Dave

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Location: Middle England UK

Post Wed Dec 27, 2006 6:13 pm

Maybe I should have PM'd you instead of running up the flag,I've had a nice 4 line M41 for less than that.
Didn't think about it being a bobber so maybe a monobloc is the way to go,or a Mikuni :P

Would think a 1&1/16" 376 with #3 & 1/2 slide might be a start point.As it's a stroker not a rev job,don't think you'll have air speed for anything bigger.

Nice site by the way.If you're doing your own gas job on that V8 I hope you've got a laptop and plenty of time.
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Cotten

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Location: Central Illinois, USA

Post Wed Dec 27, 2006 8:14 pm

Steve!

An M642 would be pricey.

But from your site I gather that you appreciate authenticity, even if it isn't "correct".
So your tastes are like most all of us!

The perfect carb, in my very personal opinion, would be a Beck replacement Linkert, one of those with "INDIAN" stamped where the original model had been ground off so it could be sold through Brand X dealerships.
My memory squints, but I think M6SA was the common Scout replacement, and they are as cheap or cheaper than common Harley carbs because they are not AMCA "correct" for anything. (What a waste! You might even be able to make out M642 beneath the re-stamp!)

Since they were a replacement unit, many of them are quite pristine.

To make a Linkert flow to it's max for modern highway speeds, it is not rocket science to shave the shafts, knife-edge the choke disc, solder-in the discs to remove the screws, and bore the venturi over 1 1 /8" a bit.
(I'd post a pic if this forum would only support it.)

Then hide an airhorn in the aircleaner, and basically you will have added another 6 cfm at 28" over the original design,...or so my Flowmeister told me from our recorded tests.
Just how fast is traffic on your superhighways where you ride?

And it would use the stock manifold, aircleaner, support, throttle linkage, etc., etc.

And you can build it yourself instead of breaking it out of bubble-pak.

And it wouldn't look like a piece of an alien saucer grafted onto your classic.


....Cotten
PS: Limey Dave!
What's so particularly bad about M88s? (Other than that they have gone up dis-proportionately in price...)
Last edited by Cotten on Wed Dec 27, 2006 8:51 pm, edited 2 times in total.
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Pa

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Post Wed Dec 27, 2006 8:17 pm

Email me the pic Cotten. I will put it up for ya. Pa
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steve_blackbob

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Post Thu Dec 28, 2006 1:37 am

Limey_Dave wrote:Maybe I should have PM'd you instead of running up the flag,I've had a nice 4 line M41 for less than that.
Didn't think about it being a bobber so maybe a monobloc is the way to go,or a Mikuni :P

Would think a 1&1/16" 376 with #3 & 1/2 slide might be a start point.As it's a stroker not a rev job,don't think you'll have air speed for anything bigger.

Nice site by the way.If you're doing your own gas job on that V8 I hope you've got a laptop and plenty of time.


I'll keep an eye out for a Linkert on eby, but I'm getting impatient to get the motor running now, so i'll probably put an Amal on for now.

Thankfully the V8 is a carb fed one and there's a retired LPG specialist just down the road, just happens to have a new V8 kit on the shelf in his shed, if I fit it all up he'll tune it in 8)
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