OEM v8 Manifolds
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Junior Member
Joined: Mar 2014
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From: Poland
OEM v8 Manifolds
I'm assembling an AJ27 s/c engine for a project car I have, and I'm forced to ditch the original manifolds because of clearance issues around the framerails.
I also have a set from an AJ33 4.2 n/a which fit physically, but I would like to confirm that I won't loose any power using these manifolds.
It would seem as though the branched design indicates some degree of tuning in them, but of course I have no way to verify this in a home environment and the outlet flange does look somewhat "tighter."
I also have a set from an AJ33 4.2 n/a which fit physically, but I would like to confirm that I won't loose any power using these manifolds.
It would seem as though the branched design indicates some degree of tuning in them, but of course I have no way to verify this in a home environment and the outlet flange does look somewhat "tighter."
Senior Member
Joined: Mar 2011
Posts: 662
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From: 'Out West', USA
If being mounted onto a Supercharged engine- you WILL lose power using the NA split logs from the AJ33/34/36.
The 'split logs' are designed to boost low speed torque on the NA engine by keeping the exhaust pulses separated. On the S/C AJ33 when we kept the 'split logs' we lost power as outright flow capacity was more important than split the tuning pulses and the AJ33 S/C manifolds are already of a smaller cross sectional diameter than the AJ27 S/C.
Can you source AJ33 SC manifolds and will they still fit in your application?
The 'split logs' are designed to boost low speed torque on the NA engine by keeping the exhaust pulses separated. On the S/C AJ33 when we kept the 'split logs' we lost power as outright flow capacity was more important than split the tuning pulses and the AJ33 S/C manifolds are already of a smaller cross sectional diameter than the AJ27 S/C.
Can you source AJ33 SC manifolds and will they still fit in your application?
Senior Member
Joined: Jun 2012
Posts: 121
Likes: 49
From: United Kingdom
If being mounted onto a Supercharged engine- you WILL lose power using the NA split logs from the AJ33/34/36.
The 'split logs' are designed to boost low speed torque on the NA engine by keeping the exhaust pulses separated. On the S/C AJ33 when we kept the 'split logs' we lost power as outright flow capacity was more important than split the tuning pulses and the AJ33 S/C manifolds are already of a smaller cross sectional diameter than the AJ27 S/C.
Can you source AJ33 SC manifolds and will they still fit in your application?
The 'split logs' are designed to boost low speed torque on the NA engine by keeping the exhaust pulses separated. On the S/C AJ33 when we kept the 'split logs' we lost power as outright flow capacity was more important than split the tuning pulses and the AJ33 S/C manifolds are already of a smaller cross sectional diameter than the AJ27 S/C.
Can you source AJ33 SC manifolds and will they still fit in your application?
pipes on a 4:2:1 design like the NA pulse paired oem’s (different pairings left and right) then with the right size secondaries into final collector 2:1 you could see benefits in NA snd SC with the same design..., but SC applications benefit from long primaries in a 4:1 design that don’t work as well with NA
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