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[GarthW]

Wow ok, so porting will give more. Thanks Barry!

[sh0rtlife]

soooo whens this porting book going to be out and where do i get it?

[la_strega_nera]

soooo whens this porting book going to be out and where do i get it?

I pre-ordered mine on amazon.com. apparently it'll arrive april sometime... :S

[Mats]

Do a search on this board.

[GarthW]

Actually i've changed my mind now, i'm leaving heads standard, as well as the cams. If i was going N/A then sure, but turbo will be making most of the power. Will be more reliable too!

[killaz]

GarthW: I doubt that stock cams will perform good, since they have overlap made for N/A engine. Maybe some of experts could compare std n/a cams with ones they use instead?

[Mats]

Exhaust valves needs to be opened earlier, not too easy to do with the SOHC head w/o new cams.

[x-rad]

how much are U spending....?

the right Turbo alone will make plenty more power. You can always change cams or have cam gears machined up later.......

just be sure to get a good exhaust mani made up so as to balance the system as much as possible, good intercooler, right compression,...and get the A/F mix right....

You will spend plenty on this stuff alone.

[Nikoror]

don't forget the right engine management system

[q4_fre]

Hi all!

Interesting subject.

I have an 2.7l V6 turbo engine (CR around 7.0-7.5:1) that I will overhaul the next weeks to come. The engine were working fine, just that I want to see how it is after 20k km driven and boosting 1.5bar on original internals, even original headgasket.

When I now rebuild the engine I was thinking of porting the heads. But then someone mentioned about other camshafts.
I run std 3l 164 cams in std 164 heads. The new setup will have the heads of an newer 164 which will have the wateroutput on the gearbox side (like std V6 TB engine) and no distributor on the crank. I will rebuild it to run wasted spark with an 6cyl coilpack.
But, camshafts. Now I do not have to worry about the "mark" in the end of the camshaft to drive the distributor, so now I have an free'er choice of cams.

Anyone have any ideas of what would be the best?
I have std 164 3l cams, std 75 cams (which I think is the same as the 164), gtv6 std cams and the cams from the original engine, the 2l TB. Anyone have an spec overview of the different cams and can tell me which one will work the best?

The engine looses big torque on top, but the Turbonetics T3/T4 E46 .63A/R turbo will not give more air at top, the boostpressure drops dramaticly. So I do not think the camshafts are the problem. But still would be nice to have an more "correct" camshaft for the job.
To get more air I am now fitting an Turbonetics T3/T4 E60 .82A/R, so that should be interesting...

Fredrik

[Barry]

Garth,mistake..port those heads and fit slightly wilder cams..

[AlfaTipo]

This is a little old but I thought I'd throw this in.

I came across what seems to be a pretty informed article on porting 2.5 heads.

I have added the info on my site as Scott Potter's site has been down for awhile (I need to ask his permission but it is/was freely available).

Check out my link page.

Any feedback would be appreciated. In the absence of Jim's book.....

[TS_turbo]

nice work looks like v6 have better intake port layout and same bad exhaust as nord if filled and raised intake port will give impressive flow even with small valve do not mess with motomans 65% min CSA ports this will never ever work for our
undervalved long stroke 2valve heads