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"Parallel" Dell'Orto DRLA 40 on a 1BBL Manifold
https://slantsix.org/forum/viewtopic.php?t=64979		 Page 2 of 2
Author:  justa170 [ Sun Jun 07, 2020 10:25 pm ]
Post subject:  Re: "Parallel" Dell'Orto DRLA 40 on a 1BBL Manifold
Quote:
Easy: the engine, as installed in the car, does not sit level front to back; it's higher in front. So the carb mounting pad is a wedge, thicker at the rear, so the carb will sit properly level when the engine is installed.
*slaps forehead* Of course! I wasn't even thinking about the 3-degrees-ish (or whatever it is in this application) front-to-back decline. I remember learning about this while looking at T-buckets with exposed engines. "Why does this thing look like it's sagging at the firewall?" :P
Author:  Joshie225 [ Mon Jun 08, 2020 10:48 am ]
Post subject:  Re: "Parallel" Dell'Orto DRLA 40 on a 1BBL Manifold
Quote:
Can you tell us more about what the Helmholtz resonator would do for the intake?
In a nutshell it will reflect a positive pressure wave back down the intake at low engine speeds to boost torque.
Author:  Dart270 [ Mon Jun 08, 2020 11:07 am ]
Post subject:  Re: "Parallel" Dell'Orto DRLA 40 on a 1BBL Manifold
Neat ideas. To anyone who makes something cool (notably Josh): I have 2-3 engines I could bolt intakes on to do testing. Cars are driven/raced pretty regularly.

Lou
Author:  Joshie225 [ Mon Jun 08, 2020 1:35 pm ]
Post subject:  Re: "Parallel" Dell'Orto DRLA 40 on a 1BBL Manifold
Quote:
Neat ideas. To anyone who makes something cool (notably Josh): I have 2-3 engines I could bolt intakes on to do testing. Cars are driven/raced pretty regularly.

Lou
Lou,

I can finish my manifold project for EFI or for dual carburetors. What sounds good to you? And at what RPM do you want the 2nd reflection?
Author:  Dart270 [ Mon Jun 08, 2020 1:45 pm ]
Post subject:  Re: "Parallel" Dell'Orto DRLA 40 on a 1BBL Manifold
Port EFI and single throttle body would be preferable. I would probably shoot for max HP around 5500 RPM. What do you think, maybe shoot for 2500 or 3000 RPM resonance and it shouldn't hurt the top end much? I am waiting on an IR setup with port EFI, which I expect will help low end substantially and not give up much (if any) up top. Lots of parameters to consider and happy to discuss in this thread, by other thread, on phone...

Lou
Author:  justa170 [ Mon Jun 08, 2020 5:04 pm ]
Post subject:  Re: "Parallel" Dell'Orto DRLA 40 on a 1BBL Manifold
Quote:
In a nutshell it will reflect a positive pressure wave back down the intake at low engine speeds to boost torque.
YES. Version 2.0 will have (a) variable-volume (and/or aperture?) resonator(s)! :wink:
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