250 U.S. LOG HEAD INTAKE POSSIBILITIES

[Anonymous]

The problem is that i am in college still and i dont have enough money for the new fancy head put out by classic inlines. from what i am looking at, it will be atleast three grand on the high side.

has any body looked at the summit racing catolog at the part OFY-5970? what is it?it is a offenhauser 3 carb intake manifold that is bolted on to the intregal manifold after the intake part of the U.S. Log Head has been drilled and properlly fitted. The information given says that it could use the existing holly 1-V for the center carb but the outer carbs are to be a smaller venturi carbs. does anybody have any information to add to this? such as which carb to use. what kind of trouble to expect or just possibly suspect?

i want to improve my intake(and gas milage) with spending the least amount of money possible, it says "They're designed to equalize fuel distribution to all cylinders, which improves fuel economy, and produces better power with smoother response across the rpm range."would this be a better choice? i understand that triple ace carbs could be tedious, but is there anything better and cheaper?

to be honest i like the nostalgic look of the three carbs, but i would like more information about the part. does the carb linkage come with the kit? i was wondering if there was anybody out there who has done this set up before or if you have any informaton. what type of carbs would i run on the outsides? THNX-JOSH

 

[mustang6]

Search around this site and you will see a number of people running this setup. My avatar is from LONG ago when I ran a daily driver with 3 carbs on the Offenhauser intake. I used the stock Autolite 1100 from my 200 in the center, with two smaller Holleys off of 170 engines on the ends. Even back then I had trouble with the Holleys flooding, leaking, idling erratically at times. A search will show you that some people run newer weber carbs on that manifold and I think that would be an improvement. That 200 felt like it would rev to the explosion point with the 3 carbs wide open, a much different feeling than the normal log head with one carb.

 

[rbohm]

8) the three carb settup is a good performance design, but can be tedious to tune properly. the reason for using smaller carbs on the ends it to avoid stumbling when the end carbs come on.

you might consider using three tempo throttle body injectors, and control them with a megasquirt efi controller which you can buy fully assembled. check out this site;

http://www.diyautotune.com/catalog/index.php

they have evrything you need to set the system up. you can choose from the original system that controls fuel only, to one that also controls the ignition system. the megasquirt is is an inexpensive way to build an efi system.

 

[Anonymous]

Does anybody have clear pictures of the offenhauser intake and the carbs all set up?i would like to see pics of how the intake fits on the head, etc.? the megasquirt sounds good , but i dont have a clue about TFI. honestly i like the idea, but i wouldn't know how to do it. also what is a port devider? and what does it do? are there any 250 exhaust headers being produced currently?

 

[falcon fanatic]

It might be a good idea for you to spend some time at www.classicinlines.com. There you'll find headers and other bolt-on goodies that you'll need to round out your project.

 

[Anonymous]

I have been looking at inlineclassics and from what i have seen there is a header thats in developement, but does anybody know about any other 250 headers being sold currently? and what exactly is a port devider and what does it do?

 

[addo]

When you look at the exhaust openings on your head, the middle two are combined into one larger rectangle.

Theory is, that if you divide this back into two separate smaller holes it will improve exhaust flow out the head. A port divider is a roughly cast lump of iron that you grind to fit into the middle (vertically) of this larger opening. It's then secured in place by the devious means of your choosing.

It may be that clifford or Hooker offer headers to fit a 250. Starter access will be the main key in making a sensible choice.

 

[falcon fanatic]

Doesn't the 250 use the same header as a 200?

Also, there is a triple carb setup for sale on this site right now. The catch is you gotta go pick it up in pennsylvania (don't know where you live). Looks like it needs some TLC, but it might be a good starting place

 

[MustangSix]

The headers are slightly different for a 200 and 250 due to stater location.

 

[Anonymous]

has any body looked at the summit racing catolog at the part OFY-5970? . The information given says that it could use the existing holly 1-V for the center carb but the outer carbs are to be a smaller venturi carbs. does anybody have any information to add to this? such as which carb to use. what kind of trouble to expect? i want to improve my intake(and gas milage), it says "They're designed to equalize fuel distribution to all cylinders, which improves fuel economy, and produces better power with smoother response across the rpm range." i understand that triple ace carbs could be tedious. to be honest i like the nostalgic look of the three carbs, but i would like more information about the part. i was wondering if there was anybody out there who has done this set up before or if you have any informaton. what type of carbs would i run on the outsides? THE BIGGER QUESTION IS HOW MUCH WILL IT COST WHEN I TAKE IT TO THE MACHINE SHOP IN THE U.S.?
THNX-JOSH

 

[addo]

Traditionally, I think people looked for carbs off a 144 to supplement the centre one.

Considering the installation costs, it'll be a while before any fuel economy gains pay you back.

To get the setup perfectly tuned, might take some while, but there shouldn't be excessive fiddling after that. If there was a need for ongoing adjustment, it's safe to say there is something not quite right.

 

[grocery getter]

i'd be surprised if anyone gets better mileage with the triple setup. if you know someone that can weld you can have carb flanges put on to save some money. since you have a 250 i'd look at an overdrive, if you don't already have one.

what are you running for an ignition system? as always, keep it tuned up.

 

[MustangSix]

I seriously doubt any gains in fuel economy. Most of the time, the engine is still running on the center carb just like before. The outer carbs will open when you are hammering it, so forget economy in that mode.

 

[Anonymous]

i'd be surprised if anyone gets better mileage with the triple setup. if you know someone that can weld you can have carb flanges put on to save some money. since you have a 250 i'd look at an overdrive, if you don't already have one.

what are you running for an ignition system? as always, keep it tuned up.

I would be running the msd blaster II ignition coil but it burnt out a lil bit a go so i am running the stock coil. i have electronic ignition. i am using the stock C-4 tranny.

How much would i be looking at if i wanted to install AOD? and also what parts would i need to buy to convert?