Intake Manifold Flow Tests: LS1, LS6, TBSS, BBK, Dorman LS2, 102 Fast LSXRT & more
#1
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I want to share the following data with the LS1TECH community.
New summary thread...with Mamo LSXR tested it's definitely time for new summary!
Blackbird-s-intake-manifold-cylinder-head-testing-summary
First a big thank you to Land Speed Cylinder Heads and Bret for doing the testing in a professional and timely manner.
For testing I provided the following:
The Players
LS1 manifold - (w/o EGR) - the 97 Corvette had this manifold and its where we started
TBSS manifold - regarded as the best of the factory cathedral intakes
Dorman LS2 92mm - Dorman revised the intake to fix the well known LS2 manifold flaws. Three Dorman test eventually including a ported one
102 FAST LSXST - regarded by many as the BEST plastic cathedral intake under 7,000 rpm
Regarding the LS6 cylinder head the vendor will not be named as the focus is on the intake manifolds. Flow benches differ and I do not think the well regarded vendor that ported the head should have any negative press due to my test. The head was not from Land Speed, TEA or Wegner etc.
The LS6 head has stock 243 valves, was advertised as 228 cc intake port and 64cc chambers. The testing was done on a calibrated Super Flo 1020 bench at 28 inches of pressure on a 4 inch bore. The intake side had a clay radius for testing the head with out an intake. The right most port was tested that would be placed at the #7 or #2 cylinder position. We tested with intake manifolds in the #7 position.
Published Flow Numbers for
Ported LS6 heads
Intake Exhaust
.100 no data
.200 157 117
.300 226 167
.400 267 204
.450 275 215
.500 283 224
.550 290 227
.600 302 234
.650 no data
New summary thread...with Mamo LSXR tested it's definitely time for new summary!
Blackbird-s-intake-manifold-cylinder-head-testing-summary
First a big thank you to Land Speed Cylinder Heads and Bret for doing the testing in a professional and timely manner.
For testing I provided the following:
The Players
LS1 manifold - (w/o EGR) - the 97 Corvette had this manifold and its where we started
TBSS manifold - regarded as the best of the factory cathedral intakes
Dorman LS2 92mm - Dorman revised the intake to fix the well known LS2 manifold flaws. Three Dorman test eventually including a ported one
102 FAST LSXST - regarded by many as the BEST plastic cathedral intake under 7,000 rpm
Regarding the LS6 cylinder head the vendor will not be named as the focus is on the intake manifolds. Flow benches differ and I do not think the well regarded vendor that ported the head should have any negative press due to my test. The head was not from Land Speed, TEA or Wegner etc.
The LS6 head has stock 243 valves, was advertised as 228 cc intake port and 64cc chambers. The testing was done on a calibrated Super Flo 1020 bench at 28 inches of pressure on a 4 inch bore. The intake side had a clay radius for testing the head with out an intake. The right most port was tested that would be placed at the #7 or #2 cylinder position. We tested with intake manifolds in the #7 position.
Published Flow Numbers for
Ported LS6 heads
Intake Exhaust
.100 no data
.200 157 117
.300 226 167
.400 267 204
.450 275 215
.500 283 224
.550 290 227
.600 302 234
.650 no data
Last edited by 99 Black Bird T/A; 07-05-2019 at 09:33 AM.
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Ted Kay (11-14-2019)
#2
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Our results flowing head, 28 inches, 4 inch bore & clay radius on intake port. No pipe on exhaust.
Intake Exhaust
.100 64.4 44.3
.200 134.5 112
.300 198 162
.400 246.5 190
.450 267 197
.500 281 203
.550 295.8 211
.600 305 214
.650 285 218
This established the base line for flow. We speculated on which intakes would perform best. Typically, LS plastic intakes will reduce airflow by 65 to 45 cfm and sometimes more. Losing less than 30 cfm would be excellent. Typically, even a Kinlser set up on a race motor will lose 5 to 10 cfm.
Several surprises, the intake port was 255 cc and it stalled at .650 lift. We didn't invest the time to determine the exact lift for the stall. Long term I plan to run stock rockers and keep cam lift under .600, so didn't feel it was an issue. There were several easy improvements revised valve job and a few spots that could be tweaked in the intake runner. The exhaust side could use similar tweaks. I have a spare set of LS6 valves so we may have some fun tweaking these heads later on and retesting the head.
Next up flow data with the intake manifolds in place.
Intake Exhaust
.100 64.4 44.3
.200 134.5 112
.300 198 162
.400 246.5 190
.450 267 197
.500 281 203
.550 295.8 211
.600 305 214
.650 285 218
This established the base line for flow. We speculated on which intakes would perform best. Typically, LS plastic intakes will reduce airflow by 65 to 45 cfm and sometimes more. Losing less than 30 cfm would be excellent. Typically, even a Kinlser set up on a race motor will lose 5 to 10 cfm.
Several surprises, the intake port was 255 cc and it stalled at .650 lift. We didn't invest the time to determine the exact lift for the stall. Long term I plan to run stock rockers and keep cam lift under .600, so didn't feel it was an issue. There were several easy improvements revised valve job and a few spots that could be tweaked in the intake runner. The exhaust side could use similar tweaks. I have a spare set of LS6 valves so we may have some fun tweaking these heads later on and retesting the head.
Next up flow data with the intake manifolds in place.
Last edited by 99 Black Bird T/A; 02-26-2017 at 04:53 PM.
#3
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Flow Data for heads, LS1(w/o EGR), TBSS, Dorman LS2 & FAST 102 LSXRT
Lift_______head_____ LS1(w/o EGR)___TBSS_____Dorman LS2___FAST LSXRT
.100_______64.4_______62.4____________59.2_____61_ ____________64.3
.200______134.5______127____________127.2____127.8 __________134.4
.300______198________174____________179______182.6 __________191
.400______246.5______211____________218.1____225.8 __________235
.450______267________221____________230.2____237.8 __________248
.500______281________230.2__________240.1____247.6 __________260
.550______295.8______238.5__________250.1____248.5 __________270.2
.600______305________242.1__________256.6____252.9 __________278
.650______285________244.3__________261.8____254.6 __________282.3
Note the WARR 92mm TB was used on all intakes manifolds except the LS1manifold. The WARR 92mm TB provided a smooth transition to snout of the various manifolds. The TB blade was zip tied open.
Lift_______head_____ LS1(w/o EGR)___TBSS_____Dorman LS2___FAST LSXRT
.100_______64.4_______62.4____________59.2_____61_ ____________64.3
.200______134.5______127____________127.2____127.8 __________134.4
.300______198________174____________179______182.6 __________191
.400______246.5______211____________218.1____225.8 __________235
.450______267________221____________230.2____237.8 __________248
.500______281________230.2__________240.1____247.6 __________260
.550______295.8______238.5__________250.1____248.5 __________270.2
.600______305________242.1__________256.6____252.9 __________278
.650______285________244.3__________261.8____254.6 __________282.3
Note the WARR 92mm TB was used on all intakes manifolds except the LS1manifold. The WARR 92mm TB provided a smooth transition to snout of the various manifolds. The TB blade was zip tied open.
Last edited by 99 Black Bird T/A; 02-26-2017 at 05:35 PM.
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RedWS6 00 (08-05-2020)
#4
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Flow Data for heads, LS1(w/o EGR), TBSS, Dorman LS2 & FAST 102 LSXRT
Lift_______head_____ LS1(w/o EGR)___TBSS_____Dorman LS2___FAST LSXRT
.100_______64.4_______62.4____________59.2_____61_ ____________64.3
.200______134.5______127____________127.2____127.8 __________134.4
.300______198________174____________179______182.6 __________191
.400______246.5______211____________218.1____225.8 __________235
.450______267________221____________230.2____237.8 __________248
.500______281________230.2__________240.1____247.6 __________260
.550______295.8______238.5__________250.1____248.5 __________270.2
.600______305________242.1__________256.6____252.9 __________278
.650______285________244.3__________261.8____254.6 __________282.3
Note the WARR 92mm TB was used on all intakes manifolds except the LS1manifold. The WARR 92mm TB provided a smooth transition to snout of the various manifolds. The TB blade was zip tied open.
Lift_______head_____ LS1(w/o EGR)___TBSS_____Dorman LS2___FAST LSXRT
.100_______64.4_______62.4____________59.2_____61_ ____________64.3
.200______134.5______127____________127.2____127.8 __________134.4
.300______198________174____________179______182.6 __________191
.400______246.5______211____________218.1____225.8 __________235
.450______267________221____________230.2____237.8 __________248
.500______281________230.2__________240.1____247.6 __________260
.550______295.8______238.5__________250.1____248.5 __________270.2
.600______305________242.1__________256.6____252.9 __________278
.650______285________244.3__________261.8____254.6 __________282.3
Note the WARR 92mm TB was used on all intakes manifolds except the LS1manifold. The WARR 92mm TB provided a smooth transition to snout of the various manifolds. The TB blade was zip tied open.
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1SS2NV00 (11-27-2020)
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Careful! This dangerously close to actual tech!
Thanks a ton for sharing. I gots a new to me LS2 that might like that dorman!!
Thanks a ton for sharing. I gots a new to me LS2 that might like that dorman!!
#14
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BLK SS, I will tweak the format later this evening for you.
Happy to share the info![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
Yes, I am up for getting other manifolds tested if someone is will to allow me to borrow them for testing. We can use the same cylinder head. I think Land Speed would do that, I would need to run it by Bret and friends before fully committing to testing. We might have to crowd source funding if there are a lot of different manifolds to test. I would have liked to include an LS6, LSX, LSXR, LS3 with cathedral adapters, ported Dorman LS2, and so on as well but I don't have any of those manifolds.
Happy to share the info
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Yes, I am up for getting other manifolds tested if someone is will to allow me to borrow them for testing. We can use the same cylinder head. I think Land Speed would do that, I would need to run it by Bret and friends before fully committing to testing. We might have to crowd source funding if there are a lot of different manifolds to test. I would have liked to include an LS6, LSX, LSXR, LS3 with cathedral adapters, ported Dorman LS2, and so on as well but I don't have any of those manifolds.
Last edited by 99 Black Bird T/A; 02-27-2017 at 05:49 AM.
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I would still really like to see back to back results on a dyno for a run of the mill mid size cam LS1 with the Dorman LS2 vs LS6 vs LS6 TPIS modded. These flow numbers are great but what are they actually worth? After all, most of the builds our there are Heads cam, or cam only LS1's.