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300 Six Compression Ratio, Intakes, Heads, etc

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85lebaront2

Re: New Page - Calculators Input Requested

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Check for the screws attaching the float bowl to throttle body being loose. That will make it run like a pig, also vacuum leaks and EGR stuck open.

Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413

1986F150Six

Re: New Page - Calculators Input Requested

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In reply to this post by Gary Lewis

The smog pump is gone and one groove of the alternator pulley is smaller and less deep, since the belt which drove the air pump was there and it was smaller.

The addition to the #1 sparkplug wire looks like the inductive pickup for a timing light [tachometer?].

The ports on the air cleaner are without vacuum hoses. This was part of the system to open the flap on the intake snorkel, controlling intake air temperatures.

Next to the temperature sensor [w/o vacuum hoses] is what I believe was where the make-up air for the PCV system was obtained, usually through a small filter located inside the air cleaner housing.

Check for a loose carburetor [2 X 1/2" nuts at base of the carburetor].

Check for damaged or missing vacuum hoses and open ports on the intake manifold [look at the vacuum "tree" located on the intake manifold just under the carburetor.

Since the air cleaner is not attached to the carburetor [for how long?], make sure the mounting bolt [wing nut] or nothing else has found its way into the carburetor throat.

Frank Wyatt

Re: New Page - Calculators Input Requested

In reply to this post by Rembrant

I've seen pistons with that shape of dish in them before and they had a compression height that sat them further down in the block, definitely not "high compression" pistons as he is trying to suggest. Not that he is trying to cheat anyone, but perhaps just doesn't know any better.

1981 F 150 Custom 300 ci with a fully rebuilt 1968 240 head Carter YFA T-18 3.25 9" rear 2WD
dual gas tanks
1990 Lincoln Town Car 5.0 AOD
Home town Mc Kenzie, TN

Frank Wyatt

Re: New Page - Calculators Input Requested

In reply to this post by 85lebaront2

Another carburetor choice would be what is available from 12bolt.com. It blocks off one primary venturi and its idle circuit and you operate on the remaining primary and the secondaries when load requires of the Holley 600 or 750. I have never personly been a fan of Holley carbs but there is a lot of parts available which would allow you to tailor it to your engine.

1981 F 150 Custom 300 ci with a fully rebuilt 1968 240 head Carter YFA T-18 3.25 9" rear 2WD
dual gas tanks
1990 Lincoln Town Car 5.0 AOD
Home town Mc Kenzie, TN

Rembrant

Re: 300 Six Compression Ratio, Intakes, Heads, etc

In reply to this post by Gary Lewis

300 Inline 6 cyl "Iron Duke"?...

https://seattle.craigslist.org/oly/cto/d/copalis-beach-1985-ford-150-4x4-4-speed/6758066527.html

Pretty sure the Iron Duke was a Pontiac inline 4 cylinder (and I'm only aware of it because it was used in some Jeeps back in the early 1980's).

https://en.wikipedia.org/wiki/Iron_Duke_engine

Unless the name has some other significance regarding the 300/6?

1994 F150 4x2 Flareside. 5.0 w/MAF, 4R70W, stock.
1984 F150 4X2 Flareside. Mild 302 w/ 5spd. Sold.
1980 F150 4X4 Flareside. 300i6 w/ 5spd. Sold in 2021.
1980 F100 4X2 Flareside. 351w/2bbl w/NP435. Sold in 1995

grumpin

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Rembrant wrote

300 Inline 6 cyl "Iron Duke"?...

https://seattle.craigslist.org/oly/cto/d/copalis-beach-1985-ford-150-4x4-4-speed/6758066527.html

Pretty sure the Iron Duke was a Pontiac inline 4 cylinder (and I'm only aware of it because it was used in some Jeeps back in the early 1980's).

https://en.wikipedia.org/wiki/Iron_Duke_engine

Unless the name has some other significance regarding the 300/6?

That's the one I remember.

Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona

85lebaront2

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

In reply to this post by Rembrant

You are correct, the "Iron Duke" was Pontiac's resurrection of the Chevy II 153 ci 4 cyl engine, it was essentially 2/3 of a Chevy 230 ci 6 cyl. Chevy decided to "improve" it with a cross flow head and different carburetor, later TBI and stick it sideways in the base Citation (Ford should have kept that name registered). The "improved" engine suffered head cracks and in the early FWD models a distributor cap that was only accessible on a lift from below, this was followed by a number of sideways GM 4s with the ignition modules on the back lower portion of the block (and you thought Fords were a PITA to work on).

Bill AKA "LOBO" Profile

Gary Lewis

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

Yep, on all counts. Had a Citation that had recall badges that went the full width of the radiator support.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

ETM

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Thanks for All This Information, Is there any one Running a Duel Carb Setup. To Solve some of the Fueling issues with only a single Carb to the Front and Rear Cylinders.
Thanks

Eric 1981 F100 - 300 I6 - M5OD Swap 2003 G35 Drift Sedan 6mt RWD - Ricer @OnlyETM Ontario, Canada

1986F150Six

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

Some have reported running a Clifford 2 X 4 intake manifold and with adapters, using a pair of 2 barrel carburetors.

85lebaront2

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

Good friend put two Holley Weber two barrels on a Clifford dual 4 barrel intake on a 240 in a 1965 F100, he also put a Clifford header on it.

Bill AKA "LOBO" Profile

ETM

Re: 300 Six Compression Ratio, Intakes, Heads, etc

In reply to this post by 1986F150Six

Thanks, Looked it up, that is a pretty cool peace.
Here is a link
https://www.shop.cliffordperformance.net/Ford-300-Twin-Weber-38-Fuel-Delivery-System-08-7001F300.htm
Not sure about this

"FORD 240/300 Twin Fuel Delivery System. Performance gains are 120% Torque & 120 Horse Power. Want better mpg?

This kit is getting an average 10 mpg better than stock."

That would be sweet

Eric 1981 F100 - 300 I6 - M5OD Swap 2003 G35 Drift Sedan 6mt RWD - Ricer @OnlyETM Ontario, Canada

Gary Lewis

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

That's an interesting setup. Looks like something I'd like to try. But, I don't by the "10 MPG better than stock". I know of stock trucks getting 20 MPG, and it isn't likely one of these trucks would get 30 MPG.

Still, I'd like to see someone try one of those kits.

Gary, AKA "Gary fellow": Profile

Rembrant

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Gary Lewis wrote

Still, I'd like to see someone try one of those kits.

It would certainly make for a sexy looking 300/6 engine bay!

85lebaront2

Re: 300 Six Compression Ratio, Intakes, Heads, etc

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In reply to this post by ETM

That is basically the setup he used. They weren't selling the Weber carbs then, so we used a couple Pinto carbs. Other item, we had them with the carbs turned with the float bowls to the front I believe, may have been to the back and the primary bore to the outside. Since the truck had a throttle rod rather than cable, we built a nice system with spherical bearings for the shaft on the inboard side of the carbs so the original relay linkage (pretty fancy system Ford used before the cables) would pull a lever approximately where the Carter throttle would have been.

The issue with a lot of the older Ford mechanical (non-cable) systems was lots of monkey motion when they got older due to wear. The engineers had designed a very nice system that, unlike some others, was not affected by engine motion from torque.

Bill AKA "LOBO" Profile

FuzzFace2

Re: 300 Six Compression Ratio, Intakes, Heads, etc

All weber carbs like that that I have played with were a progressive v2 carb.
A small primary and a little larger secondary.
I can see where that would work on a set up like that over running 2 Holley 2300 v2 carbs that has 2 ports working together.

The hardest part of duel carbs is to have to work together and you need the flow meter to do this right.

I could never get the weber's to run the way I wanted on a Datsun 1600 motor or an AMC 258. On the AMC went with the Holley 2300.
Dave ----

Dave G.
81 F100 flare side 300 six / AA OD / NP435 / 2.75 gear
http://cars.grantskingdom1.com/index.php/1980-Ford-F100?page=1
81 F100 style side 300 six/SROD parts truck -RIP
http://cars.grantskingdom1.com/index.php/1981-Ford-F100

Gary Lewis

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

Back in the day I used to sync multiple carbs with vacuum gauges. (Actually, a mercury manometer intially.) If you assume that the venturi are the same size, then vacuum at a given engine RPM is directly proportional to flow.

It is like E=IR. If you know two of the values you can solve for the third. In this case E is vacuum, I is flow, and R is the venturi restriction.

Used to do this routinely on 4 cylinder bikes, like CB750's, Kawi 900's, Yamaha 1100's, and the Goldwing 1200's. The linkages weren't perfect so we didn't get a perfect balance at every throttle opening, but we picked our balance point to be at cruise, and would go down the highway with one guy operating the bike and the passenger with the vacuum gauges on a board checking for balance. Stop and tweak and go again.

Gary, AKA "Gary fellow": Profile

85lebaront2

Re: 300 Six Compression Ratio, Intakes, Heads, etc

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I have tuned many sets of multiple carbs by simply listening to the "hiss" of the air going past the throttle plates. Most interesting to set up are the Jaguar E type series III with a 4 carb V12, two on each side. Any way you do them involves a lot of walking back and forth around the bonnet. I used to put them on a lift, raise the car just far enough that the rubber bumper pads would sit on the floor allowing the bonnet to sit vertically for better access.

I do still have 2 Uni-Syns, and one will be used fairly soon on this:

Bill AKA "LOBO" Profile

Gary Lewis

Re: 300 Six Compression Ratio, Intakes, Heads, etc

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'Vair? Looks like fun. What year? Are those Rochesters?

Gary, AKA "Gary fellow": Profile

85lebaront2

Re: 300 Six Compression Ratio, Intakes, Heads, etc

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1965 Corsa convertible, and yes those are Rochesters I rebuilt. The car was brought over here on 16 November so I could install and adjust. Missing parts, like the clips for the throttle linkage and the screws to attach it to the carbs.

Primary carbs are Rochester HVs, auxiliary (secondary) carbs are Rochester Hs.

Bill AKA "LOBO" Profile

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