Would there be any interest in an UNBIASED carb shootout?

[msapers]

I'd like to know absolute stall angle for ascent and descent, like idling and using a forklift to slowly raise the front or rear axle until the motor stalls and then measure the angle. Not an easy test to do without the right equipment, but I'm interested to know how stock compares to aftermarket since this is where I keep hearing that stock shines. I'm assuming your long steep ascent and descent is attempting to compare this, but for crawling the absolute angle is more important than the duration.

You're right, that's what I'm trying to duplicate. I know of a hill that's only about one length long and gradually goes from steep to nearly vertical. My thought is to idle up this as far as I can with a magnetic angle gauge mounted to the doorframe. This should give us a good idea of stall angle. (I don't have access to a forklift.)

 

[brew8]

you left out a major player... I'd like to see a Motorcraft 2100/2150- (Jeep inline guys been using them for years with
excellent results.)
Easy start
easy adapt
eliminates 2f linkage
no more flat spot due to vac secondaries
I am thinking about a 2F write-up soon.
I did a sbc motorcraft fj40's in 09'
https://forum.ih8mud.com/40-55-series-tech/234249-my-unscientific-quest-20-mpg-almost.html

Where did you get an adapter for the motorcraft carb to a 2F intake?????

 

[rockcod]

Are you going to use a header versus stock exhaust manifold too? Maybe then you will come and pick up this header I brought down from Stockton for you from Georg.

 

[duffontap]

wish I had your time......

Ha!

Totally interested. I've had the Rochester 2-Jet, Weber 32/36, and '78 Aisan on mine but I never was as systematic as you plan to be. Great project.

 

[msapers]

Are you going to use a header versus stock exhaust manifold too? Maybe then you will come and pick up this header I brought down from Stockton for you from Georg.

Yes to both. PM sent.

 

[mtweller]

Would be really cool if you could do the bulk of this on a dyno. More repeatability. I know it's a cost-prohibitive idea, but would be ideal.

 

[Sheck44]

Watching

In the market for a new carb so watching very closely !!

Thanks
Steve

 

[msapers]

Would be really cool if you could do the bulk of this on a dyno. More repeatability. I know it's a cost-prohibitive idea, but would be ideal.

I'd love to but, as you say, it's cost prohibitive. The butt dyno will have to do.

 

[Trollhole]

I'm assuming this is going to take some time to do? Or are you going to do it in just one day, week or month? Assuming you get through most of the carbs you currently have and it looks like this shootout will happen and if I have carbs in stock at the time I have no issue with sending you one as well providing all the tech support that comes with mine. I'm out of inventory right now and don't expect any for at least 8 weeks. I'd be interested in seeing the outcome.

 

[msapers]

I'm assuming this is going to take some time to do? Or are you going to do it in just one day, week or month? Assuming you get through most of the carbs you currently have and it looks like this shootout will happen and if I have carbs in stock at the time I have no issue with sending you one as well providing all the tech support that comes with mine. I'm out of inventory right now and don't expect any for at least 8 weeks. I'd be interested in seeing the outcome.

I'm in no real hurry. I think it would be best to run each carb for a week or so of daily driving in addition to the performance tests to ferret out any quirks. I'll start gathering the data on the stock carbs in the next week because that's what's on the 'Cruisers now. Although I'll test it stock, I need to order the parts that I know my Holley will need to make it competitive off road and I need to find a Motorcraft carb to include. I would love to include one of your carbs as well as any input you may have on the test process. Would there be any value to testing the stock 2F carb on the 1F engine?

 

[broth9640]

In order to achieve accurate results you will need to keep the ambient conditions equal. Such as temperature, dew point, and altitude? This could be tough, but you could use a density altitude calculator to ensure that all the tests were being performed under equal conditions. Here is a link to an easy calculator:

Density Altitude Calculator - English/Metric

If your unfamiliar with density altitude read this:

Density altitude - Wikipedia, the free encyclopedia

You can get your local area temp,dew point, and pressure setting from this great weather web site:

Weather Forecast & Reports - Long Range & Local | Wunderground : Weather Underground

 

[JohnnyC]

GO WEBER






















That will take a miracle

 

[hatman406080]

Nope. Not interested. I already know what carb I like best...happens to be the one I run, happens to be the original '74 mechanical secondary Ca carb. I've rebuilt it 6 or 7 times. Jim C. rebuilt it once. It's not stock but hardly anything on my rig is.
You like what you know, and I'm not about to swap it out no matter what the test results are. Thanks anyway.

x2 if dont broke let it be

 

[71AZFJ]

I think this is a great idea. LET THE GAMES BEGIN !!!!!!!

 

[65swb45]

Whichever stock carbs you decide to use, I am sure the readers would like to know whether they have the 1.12, 1.14, 1.18 or 1.2 primary jet {Fengine] or the 1.24,1.36, 1.44 or 1.47 jet [2F].

It would also be useful to know if it is running the .55, .6, .7 or larger slow jet.

It would also be useful to know if it is running the .5, .6.7, .8 or larger power valve jet.

And then there are the sizings of the emulsifiers.

There are more variables; those are just the ones off the top of my head.



Best

Mark A.

 

[edwjmcgrath]

If you want to be scientific about it, the people who are driving and taking data have to be isolated from the people installing the carbs. In other words, you can't know what you are testing.

 

[FJsnoozer]

This can only be tested on a load baring dyno and a closed course.

 

[Pighead]

If you want to be scientific about it, the people who are driving and taking data have to be isolated from the people installing the carbs. In other words, you can't know what you are testing.

The drivers must wear a blindfold at all times.

 

[shelfboy1]

after 40 years of driving fj40s with every engine combo the stock carb is best for stock engine and qj is best v8 carb.and thats 40 years of being in front of the pack.i wouldnt take a chance at getting my butt kicked on a test.but go for it and dont forget to drive it under water.!!!!!!!!!!!!

 

[DPV7070]

The drivers must wear a blindfold at all times.

Don't forget the cougar...