thingo

Yea no damper no balance shafts,my guys were not confident in the damper holding up. My valves are 40/34

AlphaOmegaPower

Funny you say that. Was on the Evo forums right after I saw you post the cfm for comparison.

They were looking at the Honda k24 head flow to compare. I think our 16v (worked) are better than that. In stock form I'm not sure. A worked k20 CNC ported was 330 cfm they said.
From what I've seen of the strokers and the 16v I think we have engines with more potential if not a lot more if things around them are brought up to speed of technology.

That's kind of why I'm building like I am. Using what Michael Mount, Sid and you time Attack guys have shown.

333pg333

I'd defer to MM but you have to imagine that as we have larger bores we can accommodate larger valves all things being equal. Having said that, because their bores are smaller they have much less gap between headstuds. ie can run significantly more boost than us. So even though we might have say 350cfm @ 550 x 28", they can just pump 50psi through their motors and sail past our equations without a care. It's all relative and numbers are just part of it.

333pg333

As usual there have been delays but now they're 99% done and just about to put it in the crate to ship down to us. Going to be stupidly tight (time / money) to get it ready for this year's WTAC and I was really close to withdrawing. However the cams finally came through although the head needed to be further modified to allow the intake cam to turn.

To package the adj cam wheels means that the crank pulley is small. An extra tensioner has been established to maximise belt wrap. Concern is how the belt is going react at over 8000rpm. Assuming Michael Mount has run his n/a motors to similar rpms I am hopeful that we have also taken every precaution here.

The next question was what housing to run with the turbo. As we're sticking with the GTX3582r we have the choice of the .82, 1.06 or even the .63 (won't be using this). Speaking with Gustaf he is quite sure that the 1.06 is the way to go and I'm inclined to believe his real world testing. Others, such as the engine builder seem to think that the .82 should be sufficient. The compromise is between driveability/spool and backpressure/strangulation. While the motor has been built to spin out to about 8800rpm we need to maximise mid range rather than top end with the H pattern gearbox. With the 94mm stroker crank I don't know how this is going to affect the motor in the upper rpms either. Having said that, the rods are actually longer than stock by 2mm by designing the pin location in the piston to assist. Don't know the actual rod/piston ratio yet but not as bad as I first thought.

Another thing is the intake. Again, as we need early to mid range tq, I'm not so sure if we'll go with a short runner intake like Gustaf's. Our memories are fresher with the 2.5 8v racemotor which was a bit laggy, so we need to allow for the extra 700cc's and stroker crank plus all the modifications to allow the motor to rev quickly. So I'm caught between smaller housing/longer runners or just trust the motor and go with the larger housing and shorter runners to allow the motor to breath more efficiently at the top end.

Any turbo plotting experts are free to chime in. :-)

Basic specs so far are:

Intake runners: Approx 280mm - 50mm OD.
Head: Pretty high lift / short duration cams high flow head
Valves: 41mm int / 35mm ex

Exhaust is 3650mm / 143" from turbo back. 3" in diameter.

The Crossover is 880mm / 34.6" from collector to turbo. 2.25" in diameter.

Headers are all different. They average 685mm / 27" to collector. 1.75"
diameter.

Collector is 125mm / 4.9" long.
Turbo: GTX3582r
Compressor wheel specs
62.5mm inducer
82.5mm exducer

Turbine wheel specs
68mm 84 Trim

refresh951

Looking good Pat, looking forward seeing you get it together.

333pg333

Thanks Shawn..me too. Keen also to see how your 16v motor turns out. Even though they're quite different there isn't a lot of precedence to refer to with these motors and one tends to grab onto whatever one can for ideas. :-)

refresh951

I hate building a motor and then waiting around for someone to install it...hopefully soon I will have some feedback.

333pg333

Ha, yes, I can imagine. Especially since this is your first 16v one. We all want to know how it goes!

944crazy

Wow, this thing is going to be even more of a BEAST! More pics please! Fingers crossed you get it ready for wtac Patrick. :-)

333pg333

Unfortunately I don't have it in my possession quite yet Timm. I'd say late next week if all goes well and Kustomz doesn't kill me!

thingo

Glad it's (nearly) on the way Patrick. You don't have to rev it out that far, we only go to 7500 or so, just see how it goes, it should have heaps of usable power.

Paulyy

You should be fine with the 1.06.
You can always go Twin scroll.

Hopefully works allows me enough time to go Sydney this year to come watch you guys run.

333pg333

It's really a bit of an unknown quantity so not sure what to expect.

I'd like to go EFR twin scroll Paul but even Garrett will require more pipework and I'm not super sure what size I'd go for in a dual X over. As Rod discovered on his old car, the size has a bit effect on backpressure and we can't afford the time to experiment.

Paulyy

Run this WTAC first obviously then make changes. you know how it works.

Good luck though, I hope you and Paul can bring it home this year.

Same goes to you Rod (if you see this) best of luck to you and your team!

333pg333

I have all 3 housings for the GTX35 now so it's a matter of picking which one. I'm 75/25 for the 1.06 one at the moment.