GT Cam Damage - Endless Spending
01-31-2012, 05:44 PM
#1
928 Collector
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GT Cam Damage - Endless Spending
Seems the GTS just doesn't want to come back from the dead.
After years of downtime and some very poor work performed on the engine years ago, I found that there were aluminium shavings from the heads (not cleaned after shaving) in the oil. So I bought a replacement engine, the one from Aspkiller's GT racecar, formerly owned by ErnestSw. $5,500 was totally worth it to me, as I was so tired of dealing with repeated expense and just never getting to drive my car.
So I've installed a pan spacer and ob oil pickup, painted the intake and cam covers and did a lot of cleaning up.
Today as I was about to instal the new cam covers, I for the first time pulled the cam covers off that had come with the GT motor. Here are 2 of the lobes.
After years of downtime and some very poor work performed on the engine years ago, I found that there were aluminium shavings from the heads (not cleaned after shaving) in the oil. So I bought a replacement engine, the one from Aspkiller's GT racecar, formerly owned by ErnestSw. $5,500 was totally worth it to me, as I was so tired of dealing with repeated expense and just never getting to drive my car.
So I've installed a pan spacer and ob oil pickup, painted the intake and cam covers and did a lot of cleaning up.
Today as I was about to instal the new cam covers, I for the first time pulled the cam covers off that had come with the GT motor. Here are 2 of the lobes.
01-31-2012, 06:26 PM
#5
928 Collector
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Answers lie I think in the past posts of Ernie:
and
Did my yearly oil change today, Mobil 1 Delvac 5W40. I noticed some magnetic material on the pickup. It was not a solid piece or pieces, but seemed to be compacted powder in consistancy and there was probably a quarter of a pencil eraser in volume.
I'm sending a sample to Blackstone for analysis. Anyone care to speculate?
I'm sending a sample to Blackstone for analysis. Anyone care to speculate?
Some time ago I posted a thread about my oil pressure light coming on at idle and my pressure gauge reading below 1 bar at idle. A big discussion ensued with me insisting it wasn't the oil, but with some people noting that when they changed to Delvac 5w40 their oil pressure dropped and their lights came on as well. I then assumed that it must be a change in the formulation of Delvac 5w40 and determined to change my oil. I haven't gotten around to it yet.
Today Pam and I went on a lovely trip to Vermont. Ambient temp around 80F (same as when I posted about the drop in pressure) and the oil pressure stayed at 1.5 bar at idle and no lights came on.
(PLAY THEME FROM TWILIGHT ZONE)
Today Pam and I went on a lovely trip to Vermont. Ambient temp around 80F (same as when I posted about the drop in pressure) and the oil pressure stayed at 1.5 bar at idle and no lights came on.
(PLAY THEME FROM TWILIGHT ZONE)
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475hp/460lb.ft
01-31-2012, 07:47 PM
#11
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Argh, really sorry to see this H. 
Exhaust lobes? I'd forgotten the part about this having been a street car before Lairry's ownership, but of course it was a street car first. Duh.
In lieu of the time and money to get those welded, or getting new cams from Porsche, Colin, or Mike S., and given your ultimate plans for the engine, might the expedient solution be to swap in the GTS cams, get it squared away paperwork-wise, and then stick the blower on it? I have no idea what kind of hp difference GT vs. GTS cams is worth given X amount of boost, but once you're above 400 rwhp, who cares?
Exhaust lobes? I'd forgotten the part about this having been a street car before Lairry's ownership, but of course it was a street car first. Duh. In lieu of the time and money to get those welded, or getting new cams from Porsche, Colin, or Mike S., and given your ultimate plans for the engine, might the expedient solution be to swap in the GTS cams, get it squared away paperwork-wise, and then stick the blower on it? I have no idea what kind of hp difference GT vs. GTS cams is worth given X amount of boost, but once you're above 400 rwhp, who cares?
01-31-2012, 07:50 PM
#12
Rennlist Member
was that really oil related ? was it an automatic. running too low of revs?
ive seen that before , but it was on a neglected auto.
how does head shavings get in the oil?? WTF??? heads are shaved and then cleaned, right???
ouch! not good. BUT they can be saved!
ive seen that before , but it was on a neglected auto.
how does head shavings get in the oil?? WTF??? heads are shaved and then cleaned, right???
ouch! not good. BUT they can be saved!
01-31-2012, 07:58 PM
#14
Nordschleife Master
Pretty typical I'm afraid.
I can have them touched up with a slightly better grind put on.
They will be as good as new. Price is $700 will take 2-3 weeks plus shipping, or you will need to arrange pick-up/delivery.
I can have them touched up with a slightly better grind put on.
They will be as good as new. Price is $700 will take 2-3 weeks plus shipping, or you will need to arrange pick-up/delivery.
01-31-2012, 08:01 PM
#15
Rennlist Member
Ouch! ... sorry to hear of your misfortune Heinrich.
I hate to mention it, but in light of the knowledge of the light oil use, and the damaged cam lobes, you really need to check bearings ....
I hate to mention it, but in light of the knowledge of the light oil use, and the damaged cam lobes, you really need to check bearings ....