Noahs944

Good to know, thanks mate. A pic says a thousand words.

Noahs944

333pg333 said: "Noah, the angle of the turbo is determined by the mount. As we go up in turbo size we found that we needed to make room for the turbine housing which meant grinding the mount and then grinding the balance shaft cover."

That's interesting. I started questioning myself if I selected the right angle to mount the turbo, but I'll let the intercooler position decide. Also considering fabricating or modding the intake (mostly for improved routing-not so much for more breathing).

Tiger03447

Noah..on the subject of the C/R..My ancient 63 Olds Jetfire (turboed) used a mix of methanol and water to control detonation. They used a small float chamber to inject the mix into the inlet air stream. I do know that the normal compression ratio was about 9.0-9.5 :1 With the turbo going, it raised the C/R about a complete point or two..enough for them to eke out 215 horse from 215 cu in. You couldn't even feel the boost come on when it engaged. The only way that you would know when it came on, was when the vacuum gauge on the console went over onto the "power" side. It was a Garrett unit...this might help save you the cost of the upgraded rods and pistons...just a thought..

V2Rocket

Olds Jetfire...jeez Rich...you've been around for a while haven't ya

V2Rocket

Noah...
You can get an 0.080" head gasket from Cometic...by my math that puts an otherwise stock NA engine at 8.7:1 compression...

http://www.cometic.com/i-24766604-po...Dporsche%2B944

MAGK944

While you replace that ^^ head gasket you can fly cut the pistons in-situ to non-interference and lower the compression even further.

V2Rocket

...or he could buy my 64k miles 951 short block and not need to cut anything...

fasteddie313

Wow, mind blown..
Had to google that..
Adhesive sandpaper on the back of your valves..

This idea turns the 2.5 into a whole other animal IMO..
You could probably buy other peoples used takeoff timing components for pennies once yours actually needed to be replaced, keep a whole extra set of takeoffs in the back for spares, lol..

You could almost turbo the thing for the money you'd save..

Do you think it would hurt the compression enough to severely hurt NA performance?

"My 944s due for a FOES, better sand the pistons.."
"New to you 944; don't know the timing belt history? Sand the pistons.."

Now I might have to buy an early 44, sand the pistons and put nitrous on it, for something to drive while my turbo is down..
Might as well buy one cheap that already threw its belt as usual..

MAGK944

I've actually seen it done in-situ, however I would likely remove the pistons and apply a coating like <Swaintech> on the crown after I fly-cut them, just for reliability.

V2Rocket

cutting the pistons only adds a couple cc's of volume - not enough to make an appreciable change in CR.

MAGK944

Depends what you cut, if it's just enough to relief the open valve then yes, not much. If you hollow out the entire center to the depth of an open valve you'll lower the compression quite a bit. I'd even say it's easier to mill out the center with the piston in-situ rather than attempting to make the individual valve cutouts bigger. There's plenty of meat on those piston crowns.

Noahs944

Oh... that cracks me up!

Dwizle

How much power is he trying to make?
Josh at rouge ran a stock internal NA at 17 -18 lbs of boost be for it gave up.
So if you have a good set up and good tune and you are trying to stay in a budget
just build it and keep the boost low or just get a set of used turbo pistons...

http://www.roguetuning.com/944na_internals_-_the_limit

Noahs944

I thought of this... if buddy boy doesn't get me those 951 pistons.

I *have* 9.5:1 pistons sitting in a box. The 10.2:1 in Wilson should come out & be sold to someone who can appreciate them. I also have an engine block with 9.5:1 in them...


Callaway had nearly 300 ponies on the cast stuff after machining. Is there a way I can do it myself? I don't have a milling machine. I do have files & sand paper.

Noahs944

Okay. This was factory? Sounds like really cool old skool technology! Post em if you got em!


I am planning on getting the standalone ecm to have a methanol and water activation circuit as an ecm output based on knock sensor input.

Were they really doing this stuff back in the day?