Ted did you record vacuum during your 3x2 tests? I was wondering if the 97's were able to supply enough air

Royce.  All I have for manifold vacuum readings for the 3X2 testing is 13”Hg @ 850 rpms.  I didn’t have the computer vacuum hooked up on any of the manifolds during the testing so full throttle vacuum data is not available ……yet.  The Edelbrock 573 will likely be installed on the engine again at which point I’ll be sure to record WOT vacuum readings.  I suspect the vacuum is still less than 1”Hg at 5500 rpms but will not know for sure until I actually confirm.

I’ll add that a problem with the Strombergs was noted before the testing even started in that the carbs would not open up fully even with the carbs off the manifold and in hand.  It  took some modifications to the carbs themselves to correct this problem but they worked much better than expected when it was all said and done.

Lorena, Texas (South of Waco)

This continues to be a very interesting discussion.  The flow area in the venturi's is a useful number to know but it does not translate directly to CFM for practical purposes because the design of the boosters is different and can effect the actual flow. However calculating the flow area is easy once you have the dia of the venturi and for Ted's tests here are the numbers:

3 Stromberg 97's     4.43 Sq inches  Venturi Dia 0.97"

The Holley 4 BBL     5.15 Sq inches

3 '56 Ford 2bbls       5.29 Sq inches  Venturi Dia 1.06"

3 Modified '56's       6.64 Sq inches  Venturi Dia 1.87" This is what the Edelbrock test used at the end.

Based on these numbers there seems to be plenty more in the 573 manifold and probably the others too. The vacuum under full load will be interesting.

It would also be interesting to see the results of a ported '57 B manifold.  Ted do you want one to try?

Doug T

The Highlands, Louisville, Ky.

Doug, i would be curious what the modifications of the 94 carbs were? thanks, regards bill.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

Doug.  I actually have several B manifolds here ported in different configurations as well as a B manifold that’s been extrude honed.  And I’ll bet you can guess who loaned me the extrude honed manifold.  But if you would like your particular posted intake compared to the others sitting here, I’ll be more than happy to run it along with the others when the time comes.  Spacer recommendation on your particular manifold is also welcome.  I can return the intake to you at Columbus.

 

I’m at least 2½ months off before that particular test takes place so no there’s no real hurry right now.  The current plans are to test the various modified B intakes along with the Blue Thunder and new Mummert intakes on ported heads as I believe it’s a moot point to do that testing on the stock heads that are currently being used.

Lorena, Texas (South of Waco)

Bill.  The modifications were all external and had to do with the original carb linkages and throttle stops on the accelerator pump linkage side of the carbs.  The carbs were essentially binding up in that area preventing the throttle blades from opening up all the way. Some careful bending and a file fixed those problems.

Lorena, Texas (South of Waco)

Ted, thanks for the info, i,m sure we can all say a big Thanks for the Unbelievable amount of R & D time you put in on our engines, its very enlightening the potential the engine does has, i believe all this testing and trying different intakes, combinations has never been done before and hence the y block was seen by the general populace as a lesser choice of engines, but the true believers can sit back and see it emerge through the clouds of doubt into the forefront of popularity! Thank you again. best regards bill.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

Royce.  I had the opportunity to retest the Edelbrock #573 3X2 setup with the Stromberg 97’s on the aluminum headed engine but this time while taking vacuum readings throughout the course of the dyno pulls.  The Stromberg carburetors are indeed restricted in the upper rpms as the manifold vacuum backed up to 2.0”Hg in the upper rpm ranges.  In this instance, this 3X2 intake can definitely benefit from either modified or larger carburetors.  The lowend torque values with this particular 3X2 setup are still extremely good though.

Lorena, Texas (South of Waco)

Ted, during the testing with the Strombergs were you using vacuum advance. Stromberg throttle bodies with vacuum ports are very rare and if you used vacuum advance I was wondering if you have the rare stock ported throttle body, modified the center throttle body or hooked it up some other way.



Sorry if it was mentioned in the thread and I missed it.

"The Master Cylinder"

Enjoying life at the beach in SOCAL

Ted ,

Ditto to what "Cusso Bill " said .You are truely a living legend on Y-Blocks . I am sure you & JM ,along with a few others will go down in history as true believers .We can never repay you for your time & effort that you put into these magic  motors .I am certain you will be highly spoken of years to come .Once again ,a BIG thank you for your time .Words can not express how much we,on this site , appreciate it .You are truely worth more money .

Regards Lon

yblocksdownunder