16v Intakes?
#1
Rennlist Member
Thread Starter
16v Intakes?
I suspect that they all have the same inlet flange (pattern/shape) but can someone confirm? We're shifting to a modified 944S head but want to use our existing inlet mani so I need to source a 2nd hand 16v mani to cut off the flanges. Assume 944S ones might be pretty rare but also assume S2's will be cheaper than 968 inlets. Not sure if Lart will have much in 16v 'stuff'...any other leads?
#2
Rennlist Member
#3
Rennlist Member
Is the S intake manifold really Mg? If so, it will be a challenge to weld. It was also a very expensive piece for Porsche to cast.
All 944/968 4V intake manifolds have the same bolt pattern. The S and S2 have the same port size, whereas the 968 intake port is much bigger.
All 944/968 4V intake manifolds have the same bolt pattern. The S and S2 have the same port size, whereas the 968 intake port is much bigger.
#4
Rennlist Member
Thread Starter
This 'S' head has been ported and modified Michael so I suspect I'm going to need the flange off a 968 intake then?
Thanks Shawn. Don't think we'll be trying to graft the Mg onto our Al intake. :-)
Thanks Shawn. Don't think we'll be trying to graft the Mg onto our Al intake. :-)
#6
Rennlist Member
Thread Starter
Thanks Mike.
Trending Topics
#8
Rennlist Member
Thread Starter
Welcome back Chris.
So how/when are they cracking? During port work? Clamping? Headlift? High boost applications?
I'm using the S head as it bolts straight onto my 2.5L block and as it's 'built' already.
So how/when are they cracking? During port work? Clamping? Headlift? High boost applications?
I'm using the S head as it bolts straight onto my 2.5L block and as it's 'built' already.
Last edited by 333pg333; 11-21-2014 at 12:38 AM.
#10
Rennlist Member
Thread Starter
In what circumstances would you describe the engines under stress when you've experienced this?
#11
Nordschleife Master
I suspect that they all have the same inlet flange (pattern/shape) but can someone confirm? We're shifting to a modified 944S head but want to use our existing inlet mani so I need to source a 2nd hand 16v mani to cut off the flanges. Assume 944S ones might be pretty rare but also assume S2's will be cheaper than 968 inlets. Not sure if Lart will have much in 16v 'stuff'...any other leads?
#12
Rennlist Member
Thread Starter
Le's talk Gustaf.
#14
Three Wheelin'
I don't have any photos handy for comparison so I'll try to explain it.
The S2 and 968 head inlet ports have the same outer dimensions, where the S2 has a more consistent gasket surface cross section on the floor of the port. On 968 heads, the gasket surface of the port floor has a much smaller cross section.
#15
Rennlist Member
Thread Starter
There is still a lot more material on the floor of the inlet vs a 968 casting. If you use a 968 flange, there will be an abrupt change in port dimensions.
I don't have any photos handy for comparison so I'll try to explain it.
The S2 and 968 head inlet ports have the same outer dimensions, where the S2 has a more consistent gasket surface cross section on the floor of the port. On 968 heads, the gasket surface of the port floor has a much smaller cross section.
I don't have any photos handy for comparison so I'll try to explain it.
The S2 and 968 head inlet ports have the same outer dimensions, where the S2 has a more consistent gasket surface cross section on the floor of the port. On 968 heads, the gasket surface of the port floor has a much smaller cross section.