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Old 11-16-2021, 01:38 PM   #1
pavetim
 
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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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Old 11-16-2021, 08:01 PM   #2
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1.9 inches:

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Old 11-17-2021, 12:37 AM   #3
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johnny on the spot, nice work.
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Old 11-17-2021, 09:32 AM   #4
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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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Old 11-17-2021, 01:56 PM   #5
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Peak(what Mitchell measured) minus base circle?
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Old 11-17-2021, 02:08 PM   #6
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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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Old 11-17-2021, 04:02 PM   #7
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Ill measure the lt5 when i get home
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Old 11-17-2021, 05:55 PM   #8
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Well the lt5 fuel lobe measures 1.9" also
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Old 11-17-2021, 06:16 PM   #9
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Quote:
Originally Posted by pavetim View Post
Well the lt5 fuel lobe measures 1.9" also
I remember reading an article about the LT4 and they said they "bored" and "stroked" the fuel pump apparently to increase capacity. So I don't know whats going on? Maybe they just increased the bore?
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Old 11-17-2021, 06:18 PM   #10
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The fuel pump on the lt4 is definaty more flow than the lt1
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Old 11-18-2021, 08:33 AM   #11
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Quote:
Originally Posted by cmitchell17 View Post
I remember reading an article about the LT4 and they said they "bored" and "stroked" the fuel pump apparently to increase capacity. So I don't know whats going on? Maybe they just increased the bore?
They also increased the fuel lobe size on the LT4 cam a long with a higher flowing pump and injector. Here is the lobe data per Lingenfelter's website.

LT1 cam fuel lobe - 5.7mm
LT4 cam - 6.0mm
GT35 v.1 - 6.5mm(32%)
GT35 v.2 - 7.85mm(44%)

Quote:
Originally Posted by pavetim View Post
Well the lt5 fuel lobe measures 1.9" also
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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Old 11-22-2021, 08:42 PM   #12
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Yeah we need somebody to measure an lt4 cam lobe now
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Old 12-08-2021, 05:00 PM   #13
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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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Old 12-09-2021, 09:27 PM   #14
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Quote:
Originally Posted by pavetim View Post
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
Because the LT5 has port injection along with direct injection.
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