fbekholden.com

Can someone tell me what I'm looking at here?
Was told it came off a Grey from a FE?
Cain Manifold with a 2 Barrel Carb...

Red motor

350 holley

Question, my mate wants to know can it be used on a Grey is there a adapter?

i would'nt i would use a ww2 or a weber from XE falcoon

thanks

SunnyTim wrote:you would be better using a spaghetti strainer to feed fuel to the engine than a 350 Holley on a grey.

Ha ha FunnyTims on a roll....

I do agree thro..

Wayne,

FB delivery is correct, it's a red motor manifold. The easy giveaway is that the red motor manifolds are normally rectangular port, and the grey motors are round port.

The carb may well be a 350 (or similar sized) two-barrel Holley. Take a look on the air-horn, and their should be a List Number stamped into it. The 350 Holleys have the following List Numbers:
R3660
R4055-1
R4056-1
R4144-1
R4670
R4791
R4792
R7448
R80120
R80320-1
R80787-1
R82010
R87448
If the List number is anything other than one of these, give me a yell and I'll hunt down what the carb is.

You can adapt the two-barrel to the grey, but the adaptors are ugly and do not distribut fuel well. The carb is hugely oversized on a grey for anything but land-speed record attempts .

Cheers,
Harv

A stock grey at 4200 Rpm (usually valve bounce at 82 Mph) will only draw 167cfm. A stock Stromberg is good for 210 Cfm.
I've got rid of the Weber on mine (DCOE sidedraft) because I couldn't tune out the flat spot down low. Its a shame as it is such a good carb but they are better suited to higher performance engines with better air flow rates than the old grey. Intake velocity speed is so important in maintaining fuel suspension in the air stream. Too slow and it drops out with the resultant problems.

G'day Craig,

Craig Allardyce wrote:A stock Stromberg is good for 210 Cfm.

Is this for a grey strommie at 3"Hg? From the various bits and pieces I've seen, it looks like the value for the larger red Strommies (15/32" venturi) @3"Hg. The value I have for a grey (13/32" venturi) Strommie @3"Hg is 162cfm, which makes them approach being marginal at full-whack on a grey.

Craig Allardyce wrote:Intake velocity speed is so important in maintaining fuel suspension in the air stream. Too slow and it drops out with the resultant problems.

Agree.
Big carb = big venturi = less pressure drop across the venturi = poorer atomisation = fuel dropout.
Big carb = big venturi = less pressure drop across the venturi = poor vacuum signal to the carb "guts" = sluggish response.
I really like vac secondaries... little carb at low noise, big carb when it needs to be.

Interesting that twins on a grey are probably slightly overcarbed. They need the venturi restrictors to pull them back a bit and increase response. They do however give better fuel distribution, which pays for some of the overcarbing/sluggishness.

Cheers,
Harv

Harv wrote:G'day Craig,

Craig Allardyce wrote:A stock Stromberg is good for 210 Cfm.

Is this for a grey strommie at 3"Hg? From the various bits and pieces I've seen, it looks like the value for the larger red Strommies (15/32" venturi) @3"Hg. The value I have for a grey (13/32" venturi) Strommie @3"Hg is 162cfm, which makes them approach being marginal at full-whack on a grey.

Craig Allardyce wrote:Intake velocity speed is so important in maintaining fuel suspension in the air stream. Too slow and it drops out with the resultant problems.

Agree.
Big carb = big venturi = less pressure drop across the venturi = poorer atomisation = fuel dropout.
Big carb = big venturi = less pressure drop across the venturi = poor vacuum signal to the carb "guts" = sluggish response.
I really like vac secondaries... little carb at low noise, big carb when it needs to be.

Interesting that twins on a grey are probably slightly overcarbed. They need the venturi restrictors to pull them back a bit and increase response. They do however give better fuel distribution, which pays for some of the overcarbing/sluggishness.

Cheers,
Harv

G'day Harv, yep your right..............I plucked my figure from memory for the Stromberg. I was a tad bit out with that one. Should have known better at my age.
Re fuel distribution I don't think twins is much better if any than a single due to the 3 port 2 carby set up. I guess the asthmatic head with Siamese ports is the major issue anyway. My last one was lucky to flow 100cfm after lots of work so the old Stromberg is well in the range. Su's are my pick for air flow matching. After that you have to push it in! Turbo or blown!