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Does anyone know the lift and duration of the DE cams? I'm currently looking at upgrading my cams but was thinking of going RB26 cams.

The RB20DE has ???deg - ???mm lift intake & ???deg - ???mm lift exhaust

The RB20DET has 240deg - 7.8mm lift intake & 240deg - 7.8mm lift exhaust

The RB26DETT has 240deg - 8.5mm lift intake & 236deg - 8.2mm lift exhaust

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RB20DET

Ex - 240 duration, 7.8 lift, opens 60 BBDC, closes TDC, LCA 120

In - 240 duration, 7.8 lift, opens 5 BTDC, closes 55 ABDC, LCA 115

overlap = 5, LSA = 117.5

RB20DE

Ex - 240 duration, 7.8 lift, opens 57 BBDC, closes 3ATDC, LCA 117

In - 232 duration, 7.3 lift, opens 5 BTDC, closes 47 ABDC, LCA 111

overlap = 8, LSA = 114

Now, if anyone understands all that ...

It would appear the best might be to just use the DE Ex cam.

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bit off topic, but blind elk, where did u get those specs from?

ive been looking for a good source for skyline cam specs and the best ive found is the tomei chart, ur specs are far more detailed

They are based on the Tomei specs. Just need to understand what each bit means then you can calculate the other bits.

(R32) RB25DE

Ex - 232 duration, 7.3 lift, opens 54 BBDC, closes 2 BTDC, LCA 118

In - 240 duration, 7.8 lift, opens 9 BTDC, closes 51 ABDC, LCA 111

overlap = 7, LSA = 114.5

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  • 5 months later...

from the info that i have gathered from fellow mechanics, the diff btwn the silver top DET n DE are the difference in lift.

the DE ones lift higher than the DET ones.

The red top cams have slightly more duration than the silver top one's.

anybody can confirm this??

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duration = how long it keeps the valve open for

lift = how much it opens the valve

opens 5 BTDC= 5 degrees before top dead center

closes 55 ABDC = closes 55 degrees after bottom dead center

LCA = lobe center angle?

overlap = how many degrees both intake and exhuast valves will be open at the same time

LSA = lobe seperation angle

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