supercharged gt has a cracked head!
11-27-2005, 03:57 PM
#16
Rennlist Member
This is aweful. i am sorry to hear about it. I advise you to replace the heads. You cannot use the 87-88 as they do not have the temp sensor port, and are actually inferior to the 89+ heads. Porsche realized an issue with cracking heads on their 32V engines and upgraded the design. I would recommend you going for new 90+ heads which would spare you the peace of mind, and the position optimized temp sensors. Welding thought strong, can never match cast.
11-27-2005, 03:58 PM
#17
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As I recall he was running a modified FAST. I am very curious what the highest boost level ran and the duration it was ran was.
Originally Posted by Sab
Sorry to hear about your mishap, shouldn't be too bad getting a used replacement head from the big three.
I think the head can be changed wiyhout the engine having to come out.
What kind of supercharger and how much boost where you running?
I think the head can be changed wiyhout the engine having to come out.
What kind of supercharger and how much boost where you running?
11-27-2005, 04:30 PM
#18
Rennlist Member
Originally Posted by WallyP
WARNING! HERESY WARNING!
If it were my car, and:
- I was certain that there is no coolant in the oil or oil in the coolant;
- Compression is normal in all cylinders;
- The crack is accessible;
- The car was a daily driver and not a show car;
then I would disconnect the ECUs, the dash, the stereo, and any other electronic gear, and I would weld the crack (with great care to avoid damage to surrounding areas and parts) and drive the car.
What do you have to lose?
HERESY WARNING OFF.
If it were my car, and:
- I was certain that there is no coolant in the oil or oil in the coolant;
- Compression is normal in all cylinders;
- The crack is accessible;
- The car was a daily driver and not a show car;
then I would disconnect the ECUs, the dash, the stereo, and any other electronic gear, and I would weld the crack (with great care to avoid damage to surrounding areas and parts) and drive the car.
What do you have to lose?
HERESY WARNING OFF.
11-27-2005, 07:58 PM
#19
Rennlist Member
If you weld the head while it is on the engine, and heat fail the head gasket and start the engine and get some heat in it, you can have a failure taht will fill the cylinder with coolant and cause a massive failure.
And without knowing the total crack geometry, you may find that it runs through areas that are crucial to engine function....
I have yet to see an engine head crack on a 85 or later engine due to overheat and we have seen alot of overheats! Headgaskets always fail first on overheats, followed by warpng the bores and then warping the heads..
And without knowing the total crack geometry, you may find that it runs through areas that are crucial to engine function....
I have yet to see an engine head crack on a 85 or later engine due to overheat and we have seen alot of overheats! Headgaskets always fail first on overheats, followed by warpng the bores and then warping the heads..