New Product Idea

[TL91]

@Quinc to your point, I've also been looking at a velocity stack with a gradual taper to it. Perhaps this would be of more interest to people?

To @waxhead point - the ADA's have such a quick transition, I'd imagine a more gradual curve would have to yield improved airflow and performance. I plan to get some flowbench data and compare. I'll share those results with everyone once it's available.

 

[waxhead]

This will be interesting. good topic

 

[Storbeck]

@Quinc to your point, I've also been looking at a velocity stack with a gradual taper to it. Perhaps this would be of more interest to people?

To @waxhead point - the ADA's have such a quick transition, I'd imagine a more gradual curve would have to yield improved airflow and performance. I plan to get some flowbench data and compare. I'll share those results with everyone once it's available.

I think this is a much more promising direction.

 

[Carrera911]

If you have an accurate flow bench and access to a 3D printer, it would be interesting to see a few of your designs tested vs the ubiquitous ADA design.

It would also be interesting to see each design tested with various flame arrestors to see how restrictive they are.


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[Quinc]

http://www.groupk.com/carbs99.htm

 

[Storbeck]

Sometimes I see $1200 carburetors with low profile flame arrestors and wonder if those people are really geting anything a 46mm sbn couldn't do. I don't know, but I wonder.

Similar story with hulls that have only pole breathers.

 

[MTRHEAD]

If you have an accurate flow bench and access to a 3D printer, it would be interesting to see a few of your designs tested vs the ubiquitous ADA design.

It would also be interesting to see each design tested with various flame arrestors to see how restrictive they are.


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I have tested over 10 different combos all on a stock spec rules based race ski. Wax is correct the old Riva’s are pretty good, Old OP’s are good, the RD cast plenums are good, velocity stacks are ok and the run of the mill adapters are down 20-40 rpm from good ones.

 

[TL91]

Sometimes I see $1200 carburetors with low profile flame arrestors and wonder if those people are really geting anything a 46mm sbn couldn't do. I don't know, but I wonder.

Similar story with hulls that have only pole breathers.

Same

 

[Citizen]

If you have an accurate flow bench and access to a 3D printer, it would be interesting to see a few of your designs tested vs the ubiquitous ADA design.

It would also be interesting to see each design tested with various flame arrestors to see how restrictive they are.


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Please test with and without https://www.blowsion.com/blowsion-outerwears while you are at it. Some people swear by them, others say they are worthless and restrict air flow too much. I am assuming they restrict, especially once wet, but if its not too bad it would be worth it to keep water out of the engine IMO.

 

[waxhead]

Please test with and without https://www.blowsion.com/blowsion-outerwears while you are at it. Some people swear by them, others say they are worthless and restrict air flow too much. I am assuming they restrict, especially once wet, but if its not too bad it would be worth it to keep water out of the engine IMO.

My experience with out wears is they work best when they are in the bin. I see no reason to put on high flowing carbs and intake then to restrict it down. Every times you put on outer wears your ski will go rich and you will lose rpm and need to jet down . This is a clear indication that you are running rich.

 

[veedubs]

I’ve thought about velocity stacks on our carbs and why they aren’t more popular. I know BNJ makes some over in Europe. Here’s a page from one of my old British Car tuning books with flow data relating to radius. Very interesting topic, guys.

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[Citizen]

My experience with out wears is they work best when they are in the bin. I see no reason to put on high flowing carbs and intake then to restrict it down. Every times you put on outer wears your ski will go rich. This is a clear indication that you are running rich.

That was always my thought, though i never did any testing. Sure would love to keep water out of my carbs though lol

 

[waxhead]

That was always my thought, though i never did any testing. Sure would love to keep water out of my carbs though lol

Stock air-cleaner, make a plate to go on top of the carbs and run adapters on top of that. use the stock air-cleaner top on it , Perfect

 

[Storbeck]

I have tested over 10 different combos all on a stock spec rules based race ski. Wax is correct the old Riva’s are pretty good, Old OP’s are good, the RD cast plenums are good, velocity stacks are ok and the run of the mill adapters are down 20-40 rpm from good ones.

I'm wondering how the stock superjet style intake compares if you have tested/compared that.

 

[MTRHEAD]

I’ve thought about velocity stacks on our carbs and why they aren’t more popular. I know BNJ makes some over in Europe. Here’s a page from one of my old British Car tuning books with flow data relating to radius. Very interesting topic, guys.

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Spot on. The OP and RD plenum work great. They are very short and a nice radius

 

[Quinc]

Spot on. The OP and RD plenum work great. They are very short and a nice radius

What about the Tau-Ceti's everyone runs?