Porting the Cossie hotside

[BDKR]

I've got me .48 cossie in me mits and am ready to start matching it to one of my 90+ mani's. Looking at it, I'm noticing a couple of places where it seems some porting is in order. As an example, there is a noticeable hump right past the wastegate entry area.

Anybody have any feelings on this one way or the other?

[dl242gt]

I left mine alone but now regret not at least taking a good look and possibly improving it a bit.

[BB-Q]

I really don't think it needs doing. That said, however, if you think you can improve it then go for it- you're not gonna do it any harm unless you thin out the material too close to the wastegate port

[BDKR]

I also meant to post this pic. Hopefully thelostartof doesn't mind.

http://www.thelostartof.net/tryingbe/turbo/turbinehousing02.jpg

Is it just me or does the Cossie entry seem smaller then some of it's compañeros in that picture?

[BB-Q]

Mine matched up almost exactly to the T3 gasket. Mine was a Turbo Technics 0.55 one, however (I only found that out just before i sold it).

[tryingbe]

I also meant to post this pic. Hopefully thelostartof doesn't mind.


Is it just me or does the Cossie entry seem smaller then some of it's compañeros in that picture?

Picture is mine. Could be optical illusion, but I suppose I can find out, if I remember.

[ShadowofBob]

I think it is an optical illusion from the rounded areas that extend out from the flange. Mine was the same size as my other T3 housing I had around.

[BDKR]

I really don't think it needs doing. That said, however, if you think you can improve it then go for it- you're not gonna do it any harm unless you thin out the material too close to the wastegate port


Well, there's not even a need to go near the wastegate port so we can set that aside. But just past the wastegate entry and as you head into the housing proper, there is a noticeable hump there that's even visible to the eye.

It's also noteworthy that where this hump is corresponds with what appears to be a portion of the housing that doesn't have that much meat. In other words, perhaps I don't want to do any porting in that area right?

Whatever the case, I'm sure the housing is going to work well.


...Could be optical illusion, but I suppose I can find out, if I remember.



Mine matched up almost exactly to the T3 gasket.



I think it is an optical illusion from the rounded areas that extend out from the flange. Mine was the same size as my other T3 housing I had around.


OK. That's good intel. I'll dub-c mine against the Super 60 I have in the garage and ultimately make sure that both sides match the gasket.

One last thing: Anyone we know of go to a stg II or III wheel in these things? My searching hasn't turned up anything on that front.

Thanx :)

[tryingbe]

You'll have to machine out the housing to use stage II or large turbine wheel.

[BDKR]

You'll have to machine out the housing to use stage II or large turbine wheel.

Yeah, I know that. I'm just looking for feedback from someone that may have done it. :nod:

[tryingbe]

Might wanna try UK's Cosworth forums.

[John V, outside agitator]

One last thing: Anyone we know of go to a stg II or III wheel in these things? My searching hasn't turned up anything on that front.

Thanx :)


I just happen to have 6 pre-production units here that I BELIEVE were finish machined for a Stage II wheel but I really can't say any details publicly cause then it might spoil all the excitement about getting NEW turbine housings which is one of the stops on my upcoming trip.
What you want to do with a Stage whatever wheel.

[BDKR]

What you want to do with a Stage whatever wheel.


I just want to ensure that my power goal is reached. I know of another chap here that did 319 wheel with a standard .48 housing with a Stage II wheel and an ATP ultimate WG on a non ported head. Mine is ported and has larger valves and a V cam (he was using an IPD Turbo cam). I'm pretty sure I'll hit that now with a T04E (I'll PM you later Tryingbe) cold side, but I'm trying to cover any areas where there may be some doubt.

[linuxman51]

I just want to ensure that my power goal is reached. I know of another chap here that did 319 wheel with a standard .48 housing with a Stage II wheel and an ATP ultimate WG on a non ported head. Mine is ported and has larger valves and a V cam (he was using an IPD Turbo cam). I'm pretty sure I'll hit that now with a T04E (I'll PM you later Tryingbe) cold side, but I'm trying to cover any areas where there may be some doubt.

get a stg 3, doubt you'd be able to measure the spool difference between it and a stage 2, and it'll cost you probably about the same.

[John V, outside agitator]

I just want to ensure that my power goal is reached. I

Which is..........?????

[badvlvo]

Which is..........?????

14.
He's already an overachiever.

[John V, outside agitator]

14.
He's already an overachiever.

Que?:wtf:

[BDKR]

Which is..........?????

Mid 300 at the wheels.

[BDKR]

14.
He's already an overachiever.

Please go to OT to make noise.

[linuxman51]

Mid 300 at the wheels.

yeah, stage 3 wheel.

[John V, outside agitator]

Mid 300 at the wheels.

Oh, then just go search some dyno sheets for YB Cossies, note that the turbine wheel used in the Cossie turbos of all years and all models is the same part number as ordinary Volvo 2,1 and 2,3 turbine wheel and from that you oughtter see the stock wheel is good to about 400 bhp.

[EricF]

Oh, then just go search some dyno sheets for YB Cossies, note that the turbine wheel used in the Cossie turbos of all years and all models is the same part number as ordinary Volvo 2,1 and 2,3 turbine wheel and from that you oughtter see the stock wheel is good to about 400 bhp.

EGT and EBR would be devastatingly high at those power levels with that tiny turbine wheel ya know...

[John V, outside agitator]

EGT and EBR would be devastatingly high at those power levels with that tiny turbine wheel ya know...


Then one must ask why do you think that people who get paid a LOT of money to build engines use that combo of that wheel and that specific housing?

[linuxman51]

Then one must ask why do you think that people who get paid a LOT of money to build engines use that combo of that wheel and that specific housing?

so who are these people and why aren't we buying stuff from them?

[BDKR]

EGT and EBR would be devastatingly high at those power levels with that tiny turbine wheel ya know...

Keeping that in mind, I have to wonder what the effects of MikeJr's output has been over time. He's using a Stg II wheel, but it's not that much bigger then the standard wheel. And to hit 319 wheel he has to be over 350 crank.

[linuxman51]

Keeping that in mind, I have to wonder what the effects of MikeJr's output has been over time. He's using a Stg II wheel, but it's not that much bigger then the standard wheel. And to hit 319 wheel he has to be over 350 crank.

its not so much the diameter of the wheel....

[linuxman51]

http://www.pbase.com/kdh51/image/26113354.jpg

though it is a bit bigger:
http://www.pbase.com/kdh51/image/26113355.jpg

And, not to suggest anything, buuuut:

http://www.pbase.com/kdh51/image/26637200.jpg

[BDKR]

That last pic looks like a Mitsu.

[linuxman51]

That last pic looks like a Mitsu.

how about that.

[BDKR]

how about that.

:pow:


























:-P

[EricF]

Mitsu compressors hit peak efficiency levels at higher RPM, so it would only make sense that the turbine wheel should be a bit smaller...

[84 Blue 240]

I will also comment from my limited knowledge of turbine design, the stage 2 wheel appears to be more of an impulse turbine. This would indicate to me it is intended to be used with a header more so than a log type manifold. Being that even the stock manifold is sorta like a header, it would probably work well, but IMHO it wouldn't make as much as a difference (in spool, not flow) as it would if you had a header (I don't know if you do). This is more of an observation for fun, not fact. Listen to Kenny, as he has tested all this shiz.