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Measured Plenum Volumes of all AMC Intakes
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jpnjim View Drop Down
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    Posted: Sep/05/2018 at 5:24pm
(Thread Title was: Performer RPM vs R4B surprising results)


I got my first Performer RPM in the mail today (thank you 15% off Ebay coupon!),

and I was surprised how small the runners seem.

So surprised that I unscientifically measured the interior volume and compared it to the R4B, and a couple other intakes.


Performer RPM #7581

Passengers side bank (high side) 5.25 cups or 1.24 liters
Drivers side bank (low side) 5.75 cups or 1.36 liters

Total volume 11 cups or 2.6 liters


Edelbrock R4B 1970+

Passengers side bank (high side) 8.5 cups or 2.0 liters
Drivers side bank (low side) 8.5 cups or 2.0 liters

Total volume 17 cups or 4.0 liters

Larger volume usually = power moves upward in the RPM band (obviously many other factors are involved as well)

^the R4B is almost 55% larger in volume than the RPM,
that helps explain some of the results jcisworthy got in his thread on the subject.




Now the really surprising part,
I also measured the volume of both the low rise dual quad Offy,
and the single plane high rise HLR intake.

The Offy 2×4 is considered a restrictive lower RPM piece that gives up power to a Torker (and I agree that it does),
and the HLR Dominator flanged intake is considered a gigantic piece that is way too big for anything other than a high RPM race engine.



Offy 2x4 low rise intake volume 
 16 cups or 3.8 liters

HLR High rise intake volume 
 16.5 cups or 3.9 liters



I know much more goes into intake performance than just volume,
but I'm shocked the lowly R4B has more intake volume than even the HLR,
and I'm equally shocked that the Offy 2x4 has almost the same volume as the HLR.







Edited by jpnjim - Sep/30/2018 at 6:02pm
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For anyone that doesn't want to read the whole thread
 results so far (as of 9/30/18):


in order of volume:



Dual Planes


Edelbrock SP2P (66-69 version)                     1.5 Liters  (6.4 cups)


Edelbrock Performer #2131                          2.5 Liters (10.5 cups)


Performer RPM #7581 Air Gap                        2.6 Liters (11 cups)

 
Edelbrock R4B 1970+                                          4.0 Liters (17 cups)





Single planes:


Edelbrock Torker #3930                                   2.72 Liters (11.5 cups)


Offy Dual Quad with 1/2" spacers                           3.8 Liters (16 cups)


HLR High rise intake (ported)                                      3.9 Liters (16.5 cups)


Edelbrock UR-18 with UR-11 Dominator top       5.32 Liters (22.5 cups)


Edelbrock UR-18 with Weiand 1911 top             5.55 Liters (23.5 cups)


Edelbrock (original) STR-11 70' up Crossram     9.32 Liters (39 cups!)


 




^^^^^^these intakes were volume tested at roughly a junior high school level of accuracy (maybe).
I duct taped the ports, made a bolt on end plate to keep most of the water in, and filled them with measuring cups.
Test was run twice on each intake, so it should be pretty accurate.

All intakes are as cast/not ported (except for the HLR intake).




Edited by jpnjim - Sep/30/2018 at 5:25pm
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Points: 2752 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jpnjim Quote  Post ReplyReply Direct Link To This Post Posted: Sep/05/2018 at 5:34pm
Nitros ports work in reverse when the unscientic duct tape comes off LOL


I can't wait to slap the little HLR on my next economy engine Wink






Edited by jpnjim - Sep/30/2018 at 5:00pm
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Excellent data there jpnjim & thanks for posting.

...'HLR' means 'Herman Lewis' ...Race? (single plane?)


Edited by amcenthusiast - Sep/05/2018 at 5:55pm
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Originally posted by amcenthusiast amcenthusiast wrote:

Excellent data there jpnjim & thanks for posting.

...'HLR' means 'Herman Lewis' ...Race? (single plane?)

Yes,
Herman Lewis Racing,
Bubble Fender has a pic of an identical intake with Edelbrock cast into it,
so the story is that Edelbrock may have developed it originally,
and then Herman Lewis picked up production of it some time later.

It's similar to the big Indy single plane thats a little more commonly available now.

The rules for single planes are different from dual planes (as I know you're aware amcenthusiast Smile ),
so I understand why a 4.0L dual plane isn't really that big,
but a 4.0L single plane is.

I was still surprised the massive HLR measured just under 4.0L's.

The Offy 2x4's large size makes some sense because the center channel between the front and rear banks is wide open inside,
but I was surprised how much water it held.
3.8L volume for the Offy includes the 1/2" spacer/adapter plates
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Test subjects from largest (left) to smallest (right)
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The engine actually sees the dual planes as half their size 
But with the HLR intake the engine sees rougly all 3.9 liters because half of the intake is not isolated from the cylinder that is drawing in the intake mixture.
Making the HLR almost twice the size of the R4B even though they have almost the same total volume. 


Edited by Lenni AMC - Sep/05/2018 at 6:15pm
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Originally posted by Lenni AMC Lenni AMC wrote:

Originally posted by jpnjim jpnjim wrote:

 

The Offy 2×4 is considered a restrictive lower RPM piece that gives up power to a Torker (and I agree that it does),
and the HLR Dominator flanged intake is considered a gigantic piece that is way too big for anything other than a high RPM race engine.



Offy 2x4 low rise intake volume 
 16 cups or 3.8 liters

HLR High rise intake volume 
 16.5 cups or 3.9 liters



I know much more goes into intake performance than just volume,
but I'm shocked the lowly R4B has more intake volume than even the HLR,
and I'm equally shocked that the Offy 2x4 has almost the same volume as the HLR.



The engine actually sees the dual planes as half their size 
Think about it this way, when the pistons are going up and down the bores with a dual plane 4 of the cylinders are connected to one bank and the other 4 are connected to the other bank
So what the engine actually sees when the pistons are moving up and down on the R4B is rougly 2 liters of volume not the total 4 you measured..

But with the HLR intake the engine sees rougly all 3.9 liters because half of the intake is not isolated from the cylinder that is drawing in the intake mixture.
Making the HLR almost twice the size of the R4B even though they have almost the same total volume. 

Thanks for the explanation Lenni!

I'm going with the RPM because of the seperate nature of the dual plane,
after seeing how small the volumes are (1.24L & 1.36L),
I'm expecting it to be even more crisp than I was originally thinking.

 I know some trim the RPM's full divider down (to increase how large an intake each cylinder "sees")
but I'll run the divider full height and see if it tames some of the overlap of the cam like I think it might.
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The far right is the Performer Air Gap, I would be very interested to see how it compares to the original non-air gapped Performer.

I have both the Performer and Torker here, might be an exercise for the weekend.
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checked 2 more just for laughs:

Original Performer (non-AirGap)

drivers bank 5.25 cups or 1.24L
passengers bank 5.25 cups or 1.24L
 
total volume 10.5 cups or 2.5L



Edelbrock SP2P (66-69 version)



drivers bank 3.5 cups or .8L
passengers bank 2.9 cups or .7L
 
total volume 6.4 cups or 1.5L LOL


I have a Machine intake and a Torker (somewhere) to test at some point,

 I'd test a Crossram if I can seal the top without a gasket,
and a UR18,
but I'll need some bigger measuring cups first. LOL
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