GT3RS Gen 2 3.8 & 4.0 engine problems
Discussion
fioran0 said:
the 997.1 certainly wouldnt be anything to do with the fact that porsche said they were using an "improved" longer and thinner connecting rod with a smaller diameter wrist pin (131.5mm/21mm) in the engines to further save weight, giving this a new and unique 997 part number.
a spec that wasnt used in the 997 Cup engines which instead stuck with the rod and wrist pin dimensions used in the 996.2 GT3 and 996 Cup (130mm/22mm) and using a 996 part number.
it would also be a complete coincidence that this "improved" rod was superseded from its original 997 part number after release to a new 996 part number before being superseded again to the 996 part number used for the connecting rods on the 996.2GT3, 996 Cup and 997 Cup 3.6L.
that this change in PN would mean that the comnecting rods also changed in spec back to the original length and wrist pin diameter from this new spec, all without a mention to anyone is merely a footnote.
fwiw, the only 997.2 problems ive seen anything about are to do with the clutch pressure plates failing (warranty) and wheels falling off (no warranty). that porsche has done seemingly nothing at all on the wheels would seem to rule out them suddenly rushing into action for some engine issue telling owners not to move their cars- unless ofcourse it would be harder to deny warranty for an engine popping than a wheel falling off and they were going to have to pick up a lot of tabs.
IMHO for any issue plan on the solution chosen as being whatever is cheapest. placing fingers into your ears while closing your eyes is pretty cheap.
fiorano Do you think the (new and improved) connecting rods that porsche used in 997mk1 gt3 will in the long run cause much problems? Seems from talking and leastening to prople the road going 996gt3 seems a bit stronger than its 997 counterpart (slightly annoying when u own a 997 mk1)a spec that wasnt used in the 997 Cup engines which instead stuck with the rod and wrist pin dimensions used in the 996.2 GT3 and 996 Cup (130mm/22mm) and using a 996 part number.
it would also be a complete coincidence that this "improved" rod was superseded from its original 997 part number after release to a new 996 part number before being superseded again to the 996 part number used for the connecting rods on the 996.2GT3, 996 Cup and 997 Cup 3.6L.
that this change in PN would mean that the comnecting rods also changed in spec back to the original length and wrist pin diameter from this new spec, all without a mention to anyone is merely a footnote.
fwiw, the only 997.2 problems ive seen anything about are to do with the clutch pressure plates failing (warranty) and wheels falling off (no warranty). that porsche has done seemingly nothing at all on the wheels would seem to rule out them suddenly rushing into action for some engine issue telling owners not to move their cars- unless ofcourse it would be harder to deny warranty for an engine popping than a wheel falling off and they were going to have to pick up a lot of tabs.
IMHO for any issue plan on the solution chosen as being whatever is cheapest. placing fingers into your ears while closing your eyes is pretty cheap.
Edited by fioran0 on Saturday 6th October 02:07
fioran0 said:
NIgt3 said:
fiorano Do you think the (new and improved) connecting rods that porsche used in 997mk1 gt3 will in the long run cause much problems? Seems from talking and leastening to prople the road going 996gt3 seems a bit stronger than its 997 counterpart (slightly annoying when u own a 997 mk1)
who can say, i certainly wouldnt be losing any sleep over it. even in the worst case and long term problems somehow emerge these engines are very easy to open and hugely versatile. any owner without a problem already could open their engine, fit different rods and mitigate without any trouble at all.that post was somewhat tongue in cheek though the info contained is accurate.
Edited by fioran0 on Saturday 6th October 16:47
ooops, lost it as i was trying to add
who can say, i certainly wouldnt be losing any sleep over it. even in the worst case and long term problems somehow emerge these engines are very easy to open and hugely versatile. any owner without a problem already could open their engine, fit different rods and mitigate without any trouble at all.
that post was somewhat tongue in cheek though the info contained is accurate.
who can say, i certainly wouldnt be losing any sleep over it. even in the worst case and long term problems somehow emerge these engines are very easy to open and hugely versatile. any owner without a problem already could open their engine, fit different rods and mitigate without any trouble at all.
that post was somewhat tongue in cheek though the info contained is accurate.
NIgt3 said:
Cheers for reply, new your first post was a bit tongue and cheek but not completely irrelevant, just seems the 996's give a little less trouble!
yeah, if you exclude their coolant fittings 
the 997.1 GT3 is a fantastic car. the 997.2 RS is almost perfect. anyone with either should be feeling pretty happy IMHO.
what i was trying to post in the other post before the edit caught me out was:
ive only heard of 997.1 rod failures but im hardly the final word on it all. There's also zero info on whether the rods fail first or secondary as engines all get exchanged back to Germany.
ive also never seen one of these magical new rods porsche were very proud of before replacing but then ive only seen inside one 997.1 street engine.
that engine was a 2008 GT3 engine and it had 996 part number rods. Sadly i don't know whether this was an original engine or a replacement.
IF it was original, one wonders if the 997 rods ever even made it to a car in any form other than paper. if they did was it only to some and is it these that have had the odd problem?
Edited by fioran0 on Saturday 6th October 17:46
fioran0 said:
NIgt3 said:
Cheers for reply, new your first post was a bit tongue and cheek but not completely irrelevant, just seems the 996's give a little less trouble!
yeah, if you exclude their coolant fittings the 997.1 GT3 is a fantastic car. the 997.2 RS is almost perfect. anyone with either should be feeling pretty happy IMHO.
what i was trying to post in the other post before the edit caught me out was:
ive only heard of 997.1 rod failures but im hardly the final word on it all.
ive also never seen one of these magical new rods porsche were very proud of before replacing but then ive only seen inside one 997.1 street engine.
that engine was a 2008 GT3 engine and it had 996 part number rods. i don't know whether this was an original engine or not.
IF it was original, one wonders if the 997 rods ever even made it to a car, if they did was it only in some and is it these that have had the odd problem?
IF it was a replacement then all bets are off again.
Edited by fioran0 on Saturday 6th October 17:24
I always enjoy these posts.
This is where hard driven road cars on track, greet lightly driven racing cars on track.
The 35 / 50 /100 hour rebuild becomes a reality --- if one is really enjoying ones GT3.
At track day speeds 100 hours is 6000 miles on track, the best part of 4000 litres of fuel and maybe three years of track days. Road miles barely count .... I'm told
This is where hard driven road cars on track, greet lightly driven racing cars on track.
The 35 / 50 /100 hour rebuild becomes a reality --- if one is really enjoying ones GT3.
At track day speeds 100 hours is 6000 miles on track, the best part of 4000 litres of fuel and maybe three years of track days. Road miles barely count .... I'm told
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