11-16-2021, 01:38 PM | #1 |
Drives: firebird Join Date: Jan 2010
Location: valdosta, georgia
Posts: 155
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LT1 cam measurements, anybody have one out?
Anybody have a 2017, 2018 LT1 camshaft laying around? Need fuel lobes measured, i have an lt5 cam and need to compare
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11-16-2021, 08:01 PM | #2 |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,196
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1.9 inches:
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11-17-2021, 12:37 AM | #3 |
Drives: like an old lady Join Date: Jun 2012
Location: indiana
Posts: 2,394
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johnny on the spot, nice work.
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11-17-2021, 09:32 AM | #4 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,763
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OEM Cam fuel lobe Specs:
LT1- 5.5mm LT4- 6.0mm LT5- ? Not sure on the formula used to come up with those numbers. 1.9in equals 48mm so there has to be a formula to get to 5.5mm.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
11-17-2021, 01:56 PM | #5 |
Drives: 6th gen Join Date: Aug 2013
Location: US
Posts: 3,664
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Peak(what Mitchell measured) minus base circle?
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11-17-2021, 02:08 PM | #6 |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,196
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Yeah I don't know any way to measure base circle on a tri-lobe, he will just have to make the same measurement on the LT4 cam.
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11-17-2021, 04:02 PM | #7 |
Drives: firebird Join Date: Jan 2010
Location: valdosta, georgia
Posts: 155
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Ill measure the lt5 when i get home
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11-17-2021, 05:55 PM | #8 |
Drives: firebird Join Date: Jan 2010
Location: valdosta, georgia
Posts: 155
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Well the lt5 fuel lobe measures 1.9" also
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11-17-2021, 06:16 PM | #9 |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,196
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11-17-2021, 06:18 PM | #10 |
Drives: firebird Join Date: Jan 2010
Location: valdosta, georgia
Posts: 155
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The fuel pump on the lt4 is definaty more flow than the lt1
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11-18-2021, 08:33 AM | #11 | |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,763
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Quote:
LT1 cam fuel lobe - 5.7mm LT4 cam - 6.0mm GT35 v.1 - 6.5mm(32%) GT35 v.2 - 7.85mm(44%) Makes sense since the LT5 cam has the same specs as the LT1. The only difference is that it's non AFM. Now all we need is a LT4 cam to measure. I bet you get a different measurement then 1.9".
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
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11-22-2021, 08:42 PM | #12 |
Drives: firebird Join Date: Jan 2010
Location: valdosta, georgia
Posts: 155
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Yeah we need somebody to measure an lt4 cam lobe now
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12-08-2021, 05:00 PM | #13 |
Drives: firebird Join Date: Jan 2010
Location: valdosta, georgia
Posts: 155
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Well i measured the fuel lobe on the lt5 cam and its the same as the lt1. So minus the DOD its exactly the same. Now next question is how does it get the fuel for 755hp if its same lobe as an lt1 cam, i thpught the fuel lobe would be larger
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12-09-2021, 09:27 PM | #14 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,763
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Because the LT5 has port injection along with direct injection.
__________________
2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
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