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Camshaft Recommendation? 

 

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 Post subject: Camshaft Recommendation?
Posted: Thu Sep 20, 2007 2:13 pm 
Tyre Shredder
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Age: 61

Posts: 373

Joined: 9th Feb 2006

Ride: AU Wagon

Location: Newcastle
NSW, Australia

I am looking at using 1 of these 3 cams on an AU I6 with a turbo. Initially say 6psi with stock internals, later going to 10psi after rebuild with stronger pistons & rods if/when required.

A. Intake 6deg BTDC / 64deg ABDC, duration 250deg, valve lift 0.444in.
Exhaust 66deg BBDC / 18deg ATDC, duration 264deg, valve lift 0.476in.

B. Intake 14deg BTDC / 68deg ABDC, duration 262deg, valve lift 0.478in.
Exhaust 56deg BBDC / 24deg ATDC, duration 260deg, valve lift 0.456in.

C. Intake 23deg BTDC / 65deg ABDC, duration 268deg, valve lift 0.476in.
Exhaust 63deg BBDC / 17deg ATDC, duration 260deg, valve lift 0.450in.

None of these are really aggressive, looking at the specs cam B seems the best compromise to me due to lift and not opening the intake too early. Cam C only has 2deg more overlap than B if my calcs are right (A:24, B:38, C:40) but C seems to be set up more for scavenging on a NA setup. I only have lobe separation for C, centres are at 113.

Any thoughts on how these would go?

 

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