924Board.org

[J1NX3D]

Hi all,
was driving my car, let it warm up normally, drove for an hour (not at all hard) and came back, all guages reading normal except engine temp was up. When I parked up there were thick plumes of white smoke coming out the exhaust, I could hear coolant boiling over in the overflow tank.

i left it to run for a couple of mins to see if the temp would come down. It didn't so I shut off. I left it to sit for a lil while then came back to check oil and water. No water in the overflow tank (!!?!?), no milkshake in the oil.

the smoke didn't look or smell oily, it smelt a bit like coolant. Haven't driven it since.

Whats happened?
TIA
-worried
_________________
'86 944

[john h]

[Joes924Racer]

If its sucking the water into the cyl. it should be hydrolocking
when you try to start it...water doesnt compress like air
so it wont turn over.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

[Raceboy]

It starts, but only, if there is a little water in the cilinder. If theres a lot, then that one, where's the water, doesn't start but others will and you will bend the rod. It's a common problem in 928, only worse: you will not bend the rod, but crack the block ('cause they're made of alloy).
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

[J1NX3D]

cheers guys!

[edit] i'll check it out and confirm it. is there anything i should do- preventative maintenance- while i'm at it? I'll probably do the water pump too.

also, whats involved in 'o' ringing the head?

thanks
_________________
'86 944

[Lizard]

in order to oring the head you need to take it to a CNC shop and have them cut a groove around the chambers and then put a small wire around the port, this aids in sealing power, as far as preventitive, changing coolant every couple of years is always a good idea, and while in there replace the heater hoses (go to dealer for that) and thermostat.
_________________
3 928s,

[J1NX3D]

is a stock head gasket the way to go or is there an aftermarket one better suited?

i have an '80 euro with 7.5:1 compression and i want to eventually have a p&p head, matchported intake manifold, o ringed head, mild grind cam, 951 or 951 style i/c and run 1 bar of boost (i'm pretty much at sealevel). Upping compression wouldn't be a bad thing, i hear 951 tuners mill the head 0.050-0.060" off the head to increase compression, can i do this too? frankly, the off boost peformance of this car could use some work!

i would like to take care of most of the head related work while its off, please tell me if i'm going the wrong way about things!
Cheers!
Jae
_________________
'86 944

[Raceboy]

Upping the compression means that IC is absolutely necessary. If you stay with stock pistons and increase off-boost performance, yes, shave a bit but not from head, but from block, because blocks are easier to find in case you want go back to 7.5:1 CR. In situations like you want to achieve: 8.5:1 CR, intercooled @ 1Bar and stock pistons, you cannot let ANY detonation to happen, or you lose your pistons.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

[J1NX3D]

thanks race boy

another question: i mentioned to a friend i was thinking of o ringing the head. he said to go with a copper headgaskept instead and i wont need to bother with o ringing. for my application is this true? if so, is there an off the shelf copper headgasket available? what happens if i do both?
cheers
_________________
'86 944

[Raceboy]

Well, O-ringing without Cu-headgasket is not good, same goes for Cu-headgasket without O-ringing. I suggest you do them both. Yes, you can buy Copper headgasket, but it's easier to get the needed CAD-file of the gasket (needed for CNC-machine: laser, waterjet etc) buy copper in thickness you needed and got to the shop where they perform the cutting. My friend, who is a designer, made me this CAD-file, if you want this, just e-mail me: porsche@fastestcar.com . I already sent this file to some of our fellow boardmembers (Paul, Mark).
I took the copper and the file to the shop and it cost me ~40$ a piece to cut them But it's Estonia you know, almost everything is cheap here, except gasoline It costs approximately 1$ a liter, can you imagine?
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche