Has anyone thought of two, two barrels on a log head? Probably Autolite 1.01 or 1.02's. It is really not much more flow than most 3 X 1 set ups. And the small six likes these carbs. No way to do a progressive linkage though. I guess I picture one carb equally spaced between cyl 1 and 3, and anouther between 4 and 6. A direct mount set up would be cheap, but some involved fabrication linkage wise.
Two, two barrels on log head
- Thread starter eeyore
- Start date
Funny you should ask that. I was just looking at some old pictures on my hard drive. A fellow member ducktang sent me some pictures of a log head that had adapters on it to fit 2x2bbls. From what I remember the plate on the original 1bbl hole has a flat plat fitted to *mostly* block off the log, however it was not completely blocked off as it needed to act like a balance tube between the two "halves" of the new intake. I' guess that if you went with a progressive carb like a 32/36 webber (5200) it might work out fairly well on an daily driver.
-ron
-ron
Just recently 63comet had a head he had reworked for two Weber 32/36 progressive 2 bbl carbs just as you describe, one for each half of the log. I thought it was a beautiful design. He had briefly put it up for sale on the Forum, but before I responded he deleted the post. I believe he made a wise decision. The improved fuel distribution and increased airflow certainly must have been a vast improvement, such as the triple one barrel setups a few on here have. I know it is not as free flowing as Mike's new aluminum head, but a neat use of ingenuity never the less. It is this type of thinking that got Mike to thinkng about cylinder head improvents so much that drove him to make that head design a reality. Thank you again Mike, for all of your hard work, even though I haven't been able purchase one of the new heads yet.
Darrell
Darrell
Thanks guys, Ron's pictures are exactly what I was thinking. I too thought a divider may be needed to inprove the respose with the two comparativly big carbs. I never even thought about the progresive carbs, that's a good idea. Ultimately I'd like to use Mike's head and make a multi-carb intake. I would like to use a small six in a street rod and I like the multi-carb look, especialy on a six. But at this time the whole street rod budget is in question let alone Mike's head. Like alot of people these days I lost my job just before the holidays 
But life goes on, I'll have a job in time. Thanks again guys, and yes, thanks to Mike for everything he does for our little forgotten engine!
But life goes on, I'll have a job in time. Thanks again guys, and yes, thanks to Mike for everything he does for our little forgotten engine!It still is for sale, I am not going ahead with the project as I decided to sell the head as well as the new cam and roller timing set from Mike, I am also going to sell off the spare motor and the transmission that was rebuilt (C4). I am just waiting to put everything on Ebay.
To 63 Comet.
Do you have any pictures you could post of your two progressive two barrels on a log?
Either with the progressive carbs on the head, or just the plates on the log?
Or even better... both ways ! !
Dennis
Do you have any pictures you could post of your two progressive two barrels on a log?
Either with the progressive carbs on the head, or just the plates on the log?
Or even better... both ways ! !
Dennis
peugeot bill
Well-known member
yes virginia there is that cyl head,
it's on the mustang we have, here's a more current photo
http://s608.photobucket.com/albums/tt167/peugeot_bill/
it's on the mustang we have, here's a more current photo
http://s608.photobucket.com/albums/tt167/peugeot_bill/
8)
i wonder if you'd get the same performance with two 1100v pony carbs mounted in a simular way.
if so i'm halfway there....
i wonder if you'd get the same performance with two 1100v pony carbs mounted in a simular way.
if so i'm halfway there....
Inline6Merc
Well-known member
I ran two 1100's on my old engine and it ran really good all through out the rpm range. I started on a head like the one being discussed with two progressive 5200's. The plus too all this DIY self custom work is more horsepower and one bitchin lookin motor!
-Curtis
-Curtis
reason twin carbs work well is to do with the firing order of the six's -
when you divide the log into front(cyl 123) and back (cyl 456)
-effectively you have two 3 cyl engines.( 1st carb serving 1,2,3 and second carb serving 4,5,6) and why a divider where the orig single carb is to give the 2 off 3 cyl engines
ie with ford firing order 1,5,3,6,2,4 you have even intake pulses though each of the two carbs as the cyl 1 intake sucks though the first carb and then 120deg later the cyl 5 and 120 deg later back ( cyl3) to the the first carb and so on. so an intake pulse through each carb every 240deg
-
note also generally thats how the extractors are set up ie cyl 123 and 456
the base model 60's 6cyl jags used twin carbs as above - and tripple carbs for the hotter models
of course tripples look sexier and probably give better distribution in the constricted log ford head
but on the tripples(to clarify with the triples these intake pulses are if you have separate carb/intake/runners per pair of cylinders)
the intake pulse spacing are different across the 3 carbs
( something like 480 and 240deg for carb serving 1,2 , 480 and 240 deg for carb serving 5,6 and 360 and 360 for carb serving 3,4) - if my scribbles are correct
if the tripple carbs are connected to the open log, then the log acts as sort of a plenum and will dampen/even out the pulsing effect out.
but at the end of the day 1 , 2, 3 (or even 4,5,6) carbs will work.
brett
when you divide the log into front(cyl 123) and back (cyl 456)
-effectively you have two 3 cyl engines.( 1st carb serving 1,2,3 and second carb serving 4,5,6) and why a divider where the orig single carb is to give the 2 off 3 cyl engines
ie with ford firing order 1,5,3,6,2,4 you have even intake pulses though each of the two carbs as the cyl 1 intake sucks though the first carb and then 120deg later the cyl 5 and 120 deg later back ( cyl3) to the the first carb and so on. so an intake pulse through each carb every 240deg
-
note also generally thats how the extractors are set up ie cyl 123 and 456
the base model 60's 6cyl jags used twin carbs as above - and tripple carbs for the hotter models
of course tripples look sexier and probably give better distribution in the constricted log ford head
but on the tripples(to clarify with the triples these intake pulses are if you have separate carb/intake/runners per pair of cylinders)
the intake pulse spacing are different across the 3 carbs
( something like 480 and 240deg for carb serving 1,2 , 480 and 240 deg for carb serving 5,6 and 360 and 360 for carb serving 3,4) - if my scribbles are correct
if the tripple carbs are connected to the open log, then the log acts as sort of a plenum and will dampen/even out the pulsing effect out.
but at the end of the day 1 , 2, 3 (or even 4,5,6) carbs will work.
brett
FALCONAROUND
Well-known member
I've been building a Two 2V log head for about 3 years...
It's a little more radical than yours but basically the same
I'm going to likely use 2 autolite 2100's with the 1.08" venturi's and will have more than enough A/F to fun my little monster.
Also, about the divider between the carb's, basically making it a Dual Plane intake manifold; as far as the cubes we have and the relatively short stroke and small area of intake runner, it would likely be useless.
I've gone over it with several hugely known performance engine builders and can find no reason to divide them.
FE
It's a little more radical than yours but basically the same
I'm going to likely use 2 autolite 2100's with the 1.08" venturi's and will have more than enough A/F to fun my little monster.
Also, about the divider between the carb's, basically making it a Dual Plane intake manifold; as far as the cubes we have and the relatively short stroke and small area of intake runner, it would likely be useless.
I've gone over it with several hugely known performance engine builders and can find no reason to divide them.
FE
Wow! I didn't know what I was starting, this is great! Falcon & inline6, do you have any pictures of your set ups that you can share?
I understand that splitting the manifold creates a dual plane, and I think for driveability with the two big carbs it may have merit. It would be real easy to test after the rest of the work is done. Make a removeable divider try it in and try it out. A couple of slots milled in the original carb opening to hold the divider is no big deal while you've having the manifold milled anyway.
I understand that splitting the manifold creates a dual plane, and I think for driveability with the two big carbs it may have merit. It would be real easy to test after the rest of the work is done. Make a removeable divider try it in and try it out. A couple of slots milled in the original carb opening to hold the divider is no big deal while you've having the manifold milled anyway.
bookworm007
Well-known member
That looks awesome 63comet. How much did it cost to have the head adapted that way?