I was thinking about a series motors the other day. (Which I tend to do a lot) I was planning to pull the head of an A14 in the shed, to put on my blown A15.
After looking at the manifolds, it occurred to me that the A14 manifolds use a much larger hotbox than the A12's. So how about making a 6+mm plate to blank the hotbox flange on the exhaust manifold, then adapting a turbo flange onto this plate? You'd need to make a new inlet manifold, due to the turbo being quite close to the head. You'd also need to blank off the original frontpipe conection. (Not hard since it's got three bolts) It wouldn't be that hard to make a new dump pipe off the turbo to run down next to where the manifold ussually connects to the exhaust. You'd have to remove the flapper valve too. An internal wastegate might be thwarted by the need to rotate the compressor housing to make the turbo discharge point up. (kinda important on a drawthrough) since the wastegate pushrod diaphram often attaches to the compressor housing. But this wouldnt be a problem, beacuse you could use the factory outlet port to mount an external wastegate. And then plumb it straight back into the pipe which would be runinng quite near. That would give all the benifits of reduced gas turbulance in the dump pipe.
The gas from number four would have to travel a bit further, but probably not as far as it would need to travel on a J-pipe set up. Remember the less distance the gas travels before the turbo, the better.
I'm going to take the H82 (A14) ex manifold over to the workshop over the weekend, and try a few turbo's on to see what the fit is like.


What do you think, am I onto a winner,or am I a crackpot?

Is this what you're talking about?

this was my first turbo set-up that i still have sitting in peices in the shed, i did work very well, other than the 90 degree plenum.

Your not the only crackpot!!!

Nice.
Is that an A12, or an A14 manifold? Does that turbo adapter bolt onto the hotbox flange, or have you welded it to the manifold?
I've been gagging to build a drawthrough turbo A seires for years.
What really gets my juices flowing is how big the A14 hotbox flange is. How did you go for bonnet clearance with that riser before the turbo?

i actally re-made the riser and plenium, i replaced it with a 90 degree elbow and made the plenium to suit, i did this so the turbo spout points to the plenum, and so it fits under the bonnet no worries, there was one problem though- because it was bolted to the hotbox i blew a few gaskets that sit between the riser and the hotbox, maybe a copper gasket would be better to be used, this came off a Sunny A14 engine i'm pretty sure.

It worked well as a suckthrough set-up, with it all fixed up, didn't run it for long though, still have it all sitting in the shed in peices.

I have the remains of my first blown motor in bits in my shed too.
You don't make omlets without breaking a few eggs

haha you are both crackheads but sounds like a good idea if you are wanting to do it cheap cheap.
you know you want to make a draw through, just do it bart!

As I always said, everything you can think of has been done already...