hopin the first genners can help me
kinda 1st gen related the 13bt is goin in my 84

i tore into my 13bt "s4" last night to find that 3 of the 3 peice apex seals are broken at the pointed ends"bugger"

also on the center iron the water seal grove broke into the water jacket about 7/16ths of its wall. no fix for that right. dont think its worth it
one housing had apex seal dammage around the exshaust and a little where the intake ports are and both have chattering marks"can fell with touch" so i guess both are toast.

so i was kinda bummed that money was wasted since it only had 90,000miles.

now my question is are the center irons on the na engines the same "meaning port timming and size"

and are the na housings the same exhaust port timming?

cheers kiwi

 

The N/A and TII engines couldnt be more different.

The 6 port N/A engines have their own special ports designed to work with the pulse tuned intake which boosts torque.The primaries are small and the 4 secondaries are quite big when you combine them.They also have the exhaust splitter sleeves inside the exhaust ports to quell noise.
The 4 port TII engines have big, generous intake ports designed to flow the extra air that turbocharging delivers.The exhaust ports have no splitters since the turbo itself is a good muffler.

You can bolt the housings together,they have the same seal surfaces,but youll be making a mutt that no factory manifold is going to fit without modifications.

 

Steve, he needs to replace both housings and the center iron. The 2 end irons are good. He can use the NA housings simply by swapping exhaust sleeves. For the center iron, all he should need to do is port the NA iron to match the TII ports. He will also need to drill the coolant port on the rear iron for the stock turbo and find a spot for the coolant return.

 

TII parts cant be that hard to come by,especially considering the flood of S5 engines coming in from Japan.The S5 stuff can be used easily on the S4 engines.
Id search around for some TII stuff before messing around with changing over the N/A parts.
I guess it comes down to either money or labor.

 

well ill see what i can find around here in oregon iv got tons of time.
just dont see turbo 2's around at all in eugene