Jeez there's nothing like getting beaten at the track (finally) to make you pull your finger out on your 'Big Bore Build'!! Better get your brakes and suspension up to speed too. heheh

Nice to see some progress. I can attest to the great condition of the bores too. They looked great.

 

anything to get back at your times. i think i might get those brakes on for the next sprint. i guess it depends if i have time in between making your car faster. i will be holding you up in the corners
what do you mean the bores looked great... they still do.

 

is the "season" per calender year Sean ?
my little update
I think I've changed my mind for the last time about my car .. it's going to be 2.5 16v gt37vgt then 3.0. 2 separate engines I'm about half way through the inlet manifold now half way though mounting the big liquid cooler just sold the motec I'll try to wait before choosing a computer considering adaptronic or perhaps use one of my EMS then spend up more with tech edge or innovative for logging..

the 2.5 is made from unwanted un unsellable so its affordable for me to do sooner being a 16v its the right shape to do all the plumbing once .. being a 2.5 its a better test of the VGT concept and i can afford to break it if some of my experimental smart **** coolling system and fuel system
my 3.0 has gotten completely out of control del west ti valves considering dry sump...
so i have a fair bit of fabricating in front of me and trying to get 2 cars to into paint in the next quarter also ..
I need to get a bit focussed I'm half way though about 20 differnt things ..

 

Put 'em on, put 'em on!!!

Strange to compete against the person who prepares my car.

I wondered why I was understeering so much last time....

Well I can't see the bores with those bits of metal in them now.

 

i just want to make it clear that your car was understeering due to the driver, it had nothing to do with the fact that i needed to keep up with you.
Adam we will need some pictures soon

 

"Get knotted"

...yeah Adam...get it finished already. Then you can come up here and race around with us!

 

Well, update time. Sent the head to our machine shop for a clean up, had the exhaust guides K-lined. Put the head on yesterday after work and torqued it down. Using a cometic MLS headgasket.
This afternoon i installed the lifters, cams and tensioner, along with a new cam chain and tensioner pads. I also test fitted the SFR intake. I will remove the cam cover again as i have breathers i need to install.

 

That's looking real nice!

 

You've probably seen these new headgaskets made by 928motorsports, but in case you haven't:

http://www.928motorsports.com/parts/gcs_head_gasket.php

Choice is good...

 

Luv it

 

A couple of thoughts –
That valve cover is magnesium – it will corrode easily if not protected. The polishing compound leaves a coating on it but if you clean it off with a solvent (like brake/carb cleaner) it will start to corrode fast!

The throttle body looks like its in an interesting position. Relocated from stock?

 

So: If 8:1 CR is overly conservative for a 16V 3.0L turbo application, and 11:1 is too much, what is the consensus "goldilocks" number? (If indeed there is a consensus...)

 

There isn't one.. it all depends on the end use and goal of the person building the motor, how the motor is put together (IE what components) and what else is being used...

8:1 sacrifices low end torque, but can take higher boost on pump gas... and even tollerate Nitrous or other power adders..

11:1 will have great low end response, but can't take nearly as much boost as lower compression motor...

It is all about what YOU are doing with the end product. Street machine... not much high RPM use you could get away with low boost 11:1.. track car at WOT 90% of the time, 8:1 and high boost will yield higher HP at the end of the day, but be mostly useless below 3500 RPM...

same discussion often happens with regard to cam selection for drag racing... you can have up top power, low end torque, but it is a fine line to get both.... very fine line..

Porsche did a ballancing act with our motors to get decent low end and nice top end performance... not that this can't be improved on now because of technology, but they did a fantastic job with the tools available to them at the time...

 

Thanks Pauly, i probably wouldn't have the motivation to do this build if it werent for Patrick beating both my wakefield and Eastern creek lap times.

thanks Mark, We may even try one of them out in the future. i dont think we are going to have the headgasket issues we have with the 2.5ltr blocks, as it seems we were getting cylinder movement, maybe combined with slight headlift, that were wearing the sealing seams on the MLS cometic gaskets we were using


Thanks Sid

Hi Chris,
Yes we already thought of that. i used autosol for the final polish but even with a film on there it still corrodes. after about 2 months of sitting in the workshop there were small dots starting to appear on the surface. a quick polish with autosol cleaned them off. If it were a customers car i would most likely not do it, but being as the car lives in our workshop i don't mind the extra cleaning duties. it will be interesting to see if heat has an effect on how fast it corrodes.

As far as i know the throttle body should be stock position. i guess i will see when it all goes together. i ordered it from SFR to fit a 944s2 head.

 

Looks great Sean. I'm a bit of a sucker for that polished look too. I didn't realise the S2 cover was Mg though. Just add lightness. Hopefully this build will be the 'budget' 3L 16v one if there's such a thing.