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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #211  
Old 23rd February 2021
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Quote:
Originally Posted by Ferrous Head View Post
Isn't there a few yards left near the start line as a nod to "Olden Times" ?

Was when I was there.
I'll have a look when I'm over this year.
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  #212  
Old 23rd February 2021
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Re I.O.M., all tarmac. Maybe your thinking of the Brickyard in the States?
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  #213  
Old 23rd February 2021
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Will they be like Chinese food, after 30 mins you need another one.
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  #214  
Old 23rd February 2021
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Quote:
Originally Posted by Ferrous Head View Post
Isn't there a few yards left near the start line as a nod to "Olden Times" ?

Was when I was there.
3 foot wide section at START/FINISH that extends to pits on Gasoline Alley

It is now called the "YARD of BRICKS"
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  #215  
Old 26th February 2021
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wow I just finished reading this thread, feel like I was studying for a college class, I'm considering the change from a CV to a S&S knockoff on a Buell, so its carb only right? any info on acquiring manifolds and such??
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  #216  
Old 26th February 2021
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Yup, just the carb. No air filter, no manifold. I use an S&S filter and housing with my Keihin. Good piece of kit..
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  #217  
Old 26th February 2021
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<y original purpose was to see if they performed well enough to act as a diagnostic tool.


And they do. No doubt about it.

So with one of them and a compression gauge in half an hour you can be absolutely sure your engine problem is in the ignition system somewhere.

That's a bit over a hundred dollars worth of tools to help you eliminate 2/3rds of the problem areas on an engine that's not running right.

I think these flow somewhere around 175 CFM ? So, they'll work for engines up to 85 inches at least. Maybe more, I would have to check the numbers.
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  #218  
Old 26th February 2021
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Quote:
Originally Posted by Ferrous Head View Post
<y original purpose was to see if they performed well enough to act as a diagnostic tool.


And they do. No doubt about it.

So with one of them and a compression gauge in half an hour you can be absolutely sure your engine problem is in the ignition system somewhere.

That's a bit over a hundred dollars worth of tools to help you eliminate 2/3rds of the problem areas on an engine that's not running right.

I think these flow somewhere around 175 CFM ? So, they'll work for engines up to 85 inches at least. Maybe more, I would have to check the numbers.

Just under 150 cfm per 100 H/P...

Now look back at the 427 L-88 Chevy that the Holley 850 Dbl-Pmpr was designed for........just under 600 H/P!!!

Then the Holley Dominator...1150 CFM!!!

Just under 800 H/P
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  #219  
Old 26th February 2021
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Are they rated at the same pressures?
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  #220  
Old 26th February 2021
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Yeah, they have standardized methods for measuring air flow through carbs.

Mostly people are over carburated. It's rare to find an engine where the carburetor is restricting the engines ability to breathe.
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