Endcastings flow?

[Wreck]

Earlier you stated this

"According to my mathing, with he help of some online calculators , a N/A 2276 turning 5500 rpm at 100% VE flows 220 cfm. If your running a single center mount carb then you have 2 endcastings, each capable of flowing minimum of 110 CFM to as much as 130 CFM.
Even if you only counted the flow per cylinder at a time, each one only flows 55 CFM , which is half what the endcasting is capable of.
Tell me if im missing something here?


I am attempting to get you to visualise how low 55cfm is and that the flow numbers for the end castings is per throat , not both . So a stock head at 0.100" lift is in the ball park of 55cfm .
If I get a chance tonight , I'll plug a 2.3lt 4 cylinder etc into pipemax and 5500 at 55CFM and see what the VE is .

[BFB]

[modok]

I have a set of four 48 IDAs for a small block ford, 40mm vents
What is the cfm rating of that, in caveman units?
around 1500 or so?

I know it's not enough to make "real" power by todays standards
but beyond 450hp/6000k is where the block starts to crack in half so it's perfect IMO

[Alstrup]

[BFB]

[BFB]

As far as end castings, what about the T1 efi ones that are split. Anyone compare their flow to the “normal” DP ones?
_________________
"how am i supposed to torque the rear wheel nut to 250 ft lbs??? " - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
Most experts aren't.

[modok]

Not sure which ones you mean, but I'm pretty sure all the OEM EFi manifolds are significantly smaller diameter, under 30mm ID

[Wreck]

throwing this out there .

Has anyone welded some helmholtz resonators to the end castings to even the intake volume per runner ,mainly to help with low rpm /idle quality and even AFR ? when using a larger duration cam .

[modok]

I've looked into it, simulated putting a resonator anywhere I could think possibly make sense in the handlebar intake but so far found nothing useful.

The idea of small plenums on either side does not work well overall either.

[earthquake]

Has any body ever used a set of short K-dog manifolds and made a nice flowing upper manifold that bolts to them? It might be a little tall.

eQ
_________________
74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
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DEATH TO CHINGERS!
[From a military recruitment poster in the novel "The Stainless Steel Rat" By Harry Harrison]

[Rob Combs]

[BFB]

[BFB]

so, im going to assume none of you know otherwise someone wouldve chimed in to educate me. But on further reading & research ( which btw is not easy to find ) , cfm ratings on intakes are not comparable to cylinder cfm ratings, in a similar way to carb cfm’s ratings being different, not only between 2 & 4bbl but between carbs, heads, and engine. Im not going to try to explain it because 1. I dont remember enough specifics ( although i did save what i found ) and 2 i spent too much time looking for what i found.
Also read a lot that stated making flow numbers of heads & intake your primary focus, is a huge mistake as it’s only one factor in several dozen. All the other points made a lot of sense. Really seems flow numbers are another one of the marketing ploys that weve been taught to focus on
_________________
"how am i supposed to torque the rear wheel nut to 250 ft lbs??? " - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
Most experts aren't.

[Brian_e]

[Alstrup]