Carburation

[3W Hank]

I building a street engine but its rather a racer in old style at 285 cubics ( bore + 1/8 an stroke 4” + 1/8” )
I will run limited and use race fuel unleaded ( for smell equal Vp C11)
Hi-comp heads ’called’ 10:1, race ignition ( Kong )
Cam will be Potvin 425 grind on a 32 core and light lifter/valve.
Intake is a modify direct port Multi, made in burbank way bak in time.
Is open up between port so no direct port ( now )

-Now over to carbs, I has 2 of the LZ carbs but can do 4 of them or use 4 of 97.
If my information is correct the LZ get me 640 cfm and the 97 gets 600 and the 81 gets 700.

One question is the ’factor’ to has the LZ carbs as I has a LZ transmission and the LZ brakes.

Ideas ?

 

[Tim Ayers]

I don't know for certain, but I seem to recall the linkage on the LZ's are different than 81's-97's, so if I'm recalling correctly that is a consideration. If I'm not correct, then disregard that comment.

Your math is off on 81's. 81's are smallest of the Stromberg carbs. I forget the cfm (maybe 125), but it would less than the LZ's and 97's. 48's were the "biggest" of the three "numbered" carbs.

Run the LZ's if you want to, but after scouring numerous old pictures from "back in the day", I didn't notice many, if at all, cars running LZ carbs. Since a Lincoln was considered a luxury car, many could have still been in garages and not in junk yards.

Don't get too caught up in all this back in the day stuff. You have the opportunity to make it run well today. I would really focus on that.

For your motor, I wouldn't run it on just straight high octane race gas. I'd mix it with a ratio of regular fuel. I mix mine with a 25% LL100 AV gas and 75% non-ethanol 91 octane.

 

[big deuce]

Linkages are the same on 81 and LZ... 81 on the left, LZ on the right. You might ask Max Musgrove at 97express. He's a member here under the name, "uncle max"
The LZ has a 1.00 inch venturi, 97 is .970, 48 is 1 1/32", 81 is .810

 

[big deuce]

If it were a "true" direct port, you can get away with bigger venturi sizes. Think how they can set up 4 weber IDAs on a 289 Ford small block. In that situation, each choke is dedicated to a intake runner, but if yours is connected, probably a 97 or LZ. I have an Edelbrock 4x2 that uncle max gave me all the jetting info to set them up on a pretty stock French motor, using four 81 carbs. Having that he shared all that critical info, I chose to purchase all the parts from him.

 

[petehoovie]

Linkages are the same on 81 and LZ... 81 on the left, LZ on the right. You might ask Max Musgrove at 97express. He's a member here under the name, "uncle max"
The LZ has a 1.00 inch venturi, 97 is .970, 48 is 1 1/32", 81 is .810

 

[3W Hank]

Yes I did text wrong, its the 84 that is 700 cfm.
Max showed me a Edelbrock 4X2 and it was 81’s.
Maybe better but I has the LZ or 97.
Se picture how my intake look ( its modify between the runners )
I guess throttle linkage will direct.
Note, I’m not fokus on be era correct just use parts that was aviable before 1951.
As I use some Lincoln parts on this coupe it might cool/fun has LZ carbs.
But maybe it is more racy/classic to use four 97 and also less cfm for my cubics.
Here is picture of a set up Max did.
Nice but it was new linkage, I like std if posdible bug do not like hazzle.

 

[Tim Ayers]

A quad of LZ's would be neat for sure since you don't see many of them around. Now you got me thinking why weren't they used more. Maybe less of them were made due to the relativity lower number of Lincolns vs. the large number of Fords.

 

[3W Hank]

Yes this cars was luxuary and maybe got later in junkyard ( or never ) but the amount of damage crached cars was for shore less than Fords.
But guys did use the brakes.
In recent years I had no problem to find LZ transmissions, brakes and carbs.
Expensive, Yes but no 'that' expensive.
But my guess if one look at all hotrods made then, it could not be that many used the 39-47 LZ from the juce Fords same era.

One I know here in Sweden told me when I was after my LZ brakes ( 'why', as no one ever used them back then )

Anyway, cool with the LZ logo and to has 4 of them.
Let's see what Uncle Max says !

 

[tubman]

I bought a '36 Ford that had an "LZ" carb on it in the early nineties. It fit and worked fine. When I realized what I had, I sold it on eBay for a bunch. (I don't remember exactly how much, but enough to make me very happy.)

 

[Tim Ayers]

Yes this car was luxuary and maybe got later in junkyard ( or never ) but the amount of damage crached cars was shore less than Fords.
But guys did use the brakes.
In recent years I had no problem find LZ transmissions, brakes and carbs.
Expensive, Yes but no 'that' expensive.
But my guess if one look at all hotrods made then it could not be that yad 39-47 LZ from the juce Fords same era.
One I know here in Sweden told me when I was after my LZ brakes ( why, as no one ever used them back then )

Anyway, cool with the LZ logo and to has 4 of them.
Let's see what Uncle Max says !

100%. Who really knows? Brakes and trans/gears were absolutely used. Maybe bought right over the counter at their local Ford dealer. LOL!

 

[3W Hank]

I payed 1 grand for 2 LZ restored here in Sweden.
If I go 2 more I need cores.
As I has 2 restored 97 from Vintage and has 2 extra 97 cores that set me up less expensive plus I has the LZ to my PM7 and a maybe roadster project later on.
I ask here just to get inputs, influences as Always great.
My car is pretty loaded with old cool speed parts and the engine will be 'racy' and all is more or less Henry.
Even allot of this speedparts I swiched from my first ideas on 3W, QC, Ardun, Scintilla, Kinmonts etc. I came to the conclusion of to 'much'.

 

[Tim Ayers]

I payed 1 grand for 2 LZ restored here in Sweden.
If I go 2 more I need cores.
As I has 2 restored 97 from Vintage and has 2 extra 97 cores that set me up less expensive plus I has the LZ to my PM7 and a maybe roadster project later on.
I ask here just to get inputs, influences as Always great.
My car is pretty loaded with old cool speed parts and the engine will be 'racy' and all is more or less Henry.
Even allot of this speedparts I swiched from my first ideas on 3W, QC, Ardun, Scintilla, Kinmonts etc. I came to the conclusion of to 'much'.

Use the 97's then. Done

 

[petehoovie]

Yes I did text wrong, its the 84 that is 700 cfm.
Max showed me a Edelbrock 4X2 and it was 81’s.
Maybe better but I has the LZ or 97.
Se picture how my intake look ( its modify between the runners )
I guess throttle linkage will direct.
Note, I’m not fokus on be era correct just use parts that was aviable before 1951.
As I use some Lincoln parts on this coupe it might cool/fun has LZ carbs.
But maybe it is more racy/classic to use four 97 and also less cfm for my cubics.
Here is picture of a set up Max did.
Nice but it was new linkage, I like std if posdible bug do not like hazzle.

 

[petehoovie]

Yes this cars was luxuary and maybe got later in junkyard ( or never ) but the amount of damage crached cars was for shore less than Fords.
But guys did use the brakes.
In recent years I had no problem to find LZ transmissions, brakes and carbs.
Expensive, Yes but no 'that' expensive.
But my guess if one look at all hotrods made then, it could not be that many used the 39-47 LZ from the juce Fords same era.

One I know here in Sweden told me when I was after my LZ brakes ( 'why', as no one ever used them back then )

Anyway, cool with the LZ logo and to has 4 of them.
Let's see what Uncle Max says !