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I They came with 36 mm chokes , a bit on the small side . I got a hold of some 40mm chokes and made a fixture and bored them to 42 mm .
This diameter change from 36mm to 42mm is something like a 33% gain in air flow. If you figure out the area of 36 mm is @1018 sq mm and 42 is @1380 sq mm.
This changes the power potential from 350 hp to close to 470 hp. More than enough to feed your typical hot rodded 350 motor from 375 hp to 430 hp
From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
Originally Posted by lvrpool32
I'm running quad 48MM DRLA Del'lorto's with 46mm venturis, has no issues feeding my 396 small block. Tuning is a breeze if you take your time and pay attention, fuel pressure is very important.
I order most of my stuff direct from dellorto in the UK, its not that expensive (deffinately not cheap), but has crept up a little in the past year due to the weak $.
Nick
This is interesting to me because I am building a 396 small block. Whats your RPM range and cam specs if you are willing to share.
I am running a comp cams solid roller...have the specs at home..its in the .580 lift range...AFR 210cc heads (the new Eliminators).
The one issue with my set up is that the vintage Mackay intake has pretty long runners so more suited to low/mid range torq, so I have a sheetmetal, short runner intake I am building.
Belgian1979'
With fuel injection, do you get as much backfire as with a Weber set-up?
The backfire has to do with the fact that you have no plenum on these types to dampen the reversion in the intake tract. So even with EFI you will get some spitting back (which is not a backfire). If you don't have something to cover the throats, you could end up with a fire (with stressing the 'could' part).
I went with EFI because I have the full 50 mm of throttle bores available to my engine. It supports a max of 640 hp at 7000 on a 350. A normal weber has a venturi that has a smaller size than the bore and it is this venturi that determines how many cfm the carb allows into the engine.
EFI with a programmable computers lets you tune the engine easier without having to deal with leaning the engine out on top or having to deal with air bleeds, ....
It's very important to get the size of the itb's correct. To big a bore will mean that a small amount of throttle opening will allow for a lot of air movement. This could mean the difference between a tunable and non-tunable engine...
Don't know about the weber, but I heard the main system only kicks in at above 3000 rpm.
Last edited by Belgian1979vette; May 22, 2008 at 04:32 PM.
From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
Originally Posted by lvrpool32
I am running a comp cams solid roller...have the specs at home..its in the .580 lift range...AFR 210cc heads (the new Eliminators).
The one issue with my set up is that the vintage Mackay intake has pretty long runners so more suited to low/mid range torq, so I have a sheetmetal, short runner intake I am building.
Nick
I am thinking about something in the 5000 peak power, toping out at 5500rpm.
Some very nice looking setups in the pics, I like the look of the injection but its probably a bit outside of my budget. I plan on building the air cleaner setup with a single unit on each side, similar to the blue one pictured earlier. It looks like it may be a bit of a learning curve getting everything set up, but I think it will be worth the trouble. Thanks again for the input, I've learnt more here than I have from the sales guys.
Doug
Has any one vids & sound clips of unfiltered DCOE'e on a BBC (or SBC)?
One of the nicest sounds in the world is a four pot early twin cam Lotus or Alfa sans filters.
Has any one vids & sound clips of unfiltered DCOE'e on a BBC (or SBC)?
One of the nicest sounds in the world is a four pot early twin cam Lotus or Alfa sans filters.