Voith

Does anybody know what are these ring grooves on this head?



I found this here: http://www.oz951.com/public/rebuild.htm (I hope owner doesn't mind)

He states: The o-rings have been positioned to work with a wide fire ring head gasket.

Is this better than just leaving head flat?

JohnKoaWood

Grooves are put there to hold a wire ring, purpose of the ring is to offer a "better" seal around the combustion chamber as the rings press more in a uniform area around the sealing ring on the head gasket.

These are typically used for higher than stock boosted motors... NOT commetic HG friendly if I remember correctly!

LS1Porch

The head has been o-ringed. A special material hollow o-ring is inserted that can expand/contract as the cylinder head lifts on high boost cars. I think it's no longer considered necessary (due to improvements in headgasket and fastener technology), but it might still be common.

I'm actually a little surprised to see it done on a 944 head, since you guys have open-deck blocks!

86 951 Driver

O ring heads I know are used a lot on Banshee engines, but those are 2 strokes. Its more for ease of changeing out pistons and what not.

Voith

Got some goodies yesterday

Forged black metal rods 944.103.110.0RARST, belts, rollers and infamous 9200 tool.

Extra pistons that I don't need too.

Btw: does anybody know what timing belt is this? Is it unbranded gates or what?
It looks decent quality part..

The really interesting part is that rollers are all INA, even the one in Ruville box, and were all made in Slovakia. Slovakia is few hundred kilometers away from Slovenia.
If I were to buy these same parts made by Slovakia in Slovenia, I would pay 3x or 4x the price.
This way, the parts were shipped to USA and from there back to europe, and they come 3x cheaper...

Gotta love economy.

Travis - sflraver

Marketed as Goodyear brand though the belt itself is unbranded. It has a sub $6 price tag making it the least expensive belt you can buy for the 944 right now.

86 951 Driver

Since its so cheap is it still safe to run on the 944?

Voith

$6? wow. It looks quite nice though.

I'll be getting a better one and sell this one. I may even go with kevlar.. Interesting that this seller put together ultra cheap timing belt and gates balance belt that looks like higher standard.

Next I'll buy LR engine rebuild set, but I am still not sure which piston rings to go with, LR or OE.. You can never go wrong with OE, but I think LR are quality rings.

Olli Snellman

Balancesaft belt is unique, made just for 944's. Most likely timingbelt is a "universal" item which can be used also with some other brands.

Stephencs601

as long as you have a 3 bar regulator, stock injectors should work. Do not go any higher than 55's unless you have a 500hp+ motor. When you get the car going, you may habve to adj the FQS switch. First go to "0" mode, all the way to left. Then go to step step three. Should give you 6% more fuel without changing the timing. The air/fuel ratio is crucial. If you do not have enough fuel during spoolong, Boom the motor will go. PM me if you need more info.
My beast is deadly. I scared the heck out of one of our buds. He never expected the raw power the car generated. If I go full out, when I shift from 1st to 2nd, the car leaps off the ground and I come down spinning my wheels. Have to watch out for the rear going to the right. Unfortunately, I hurt my hand so handeling the car is rough. PT had better work for my hand or I am in trouble.

Voith

Thanks, much appreciated information. I will pm you when I get to that stage..

I will get wideband af meter and run this car only on 100 octane pump gas.

What about head studs, is there any real benefit if I change them with ARP or raceware? I see opinions on this are mixed, some say stock studs are more than enough, others see them as necessary if you want a little more power than stock?

Stephencs601

Stock works for me. The main thing was the upgraded Head Gasket. That is key here. Also, put all new hoses and vacuum parts as well. Do all new sensors especially the temp. I also put a lower therm. in.
Mine is a sleeper. No sign of being a turbo. I kept all the stock 944 NA parts. You can tell something is up if you are behind me. A 4" straight exhaust and the Turbo Valance. By then, I am so far away from you it is too late.

Voith

I will use turbo/S2 front end, but no 944 or turbo badge on the back. Also no turbo rear vailance. I hate that vailance (used to want it bad, but got f**ed up twice over that piece)

I will allso make it as clean and simple as possible. White color, black 3 piece EtaBeta for porsche rims and a shade of black paint on blinkers and rear lights. Maybe even some glass tint, but nothing too excessive.

My Goal is to make fast but bulletproof reliable and comfortable car with nice reupholstered interior. (I think I'll use aston burgundy) I want to be able to go from Visnja Gora to Amsterdam in less than ten hours.


As for parts, I'll put new valves, valve guides, springs, port intake a little bit, widefire gasket, sensors, rollers, water pump, turbo water pump, all engine bearings, piston rings, clutch, brake rotors, brakes, all engine water hoses, 3" SS exhaust, new front glass, new door gaskets, complete repaint etc etc.

Voith

I love the feel of 9200 tool. So massive and non chinese.

This should be gordon freemans weapon of choice

Banshee

Hell ya Lool :P