Help with GTS piston rings
11-10-2010, 04:29 PM
#46
Nordschleife Master
Yes. Two out of three rings have all the same critical dimensions as S4 etc 100mm rings. IIRR its 2nd compression ring which is 0.1 or 0.2mm different. In any case its one of the compression rings.
There is cheap option of using S4/GT/951 sets and only use two of the new rings and one original used GTS compression. I have tried it on one engine build but do not have long time results. In any case I can't see why it wouldn't be ok as long as remaining original GTS rings are good enough to be used.
There is cheap option of using S4/GT/951 sets and only use two of the new rings and one original used GTS compression. I have tried it on one engine build but do not have long time results. In any case I can't see why it wouldn't be ok as long as remaining original GTS rings are good enough to be used.
11-10-2010, 07:36 PM
#47
Originally Posted by 928GTSM
;8045913Koenig 928, when you say about oil being sucked into the intake are you referring to ahead of or after the MAF? When I recently changed the CPS and had to remove the MAF there was no oil at all accumulated in there. Presumably I'm not going to know about the possibility of worn valve guides until I get the engine apart.
Also, I meant the valve guide seals, not the valve guides.
11-11-2010, 05:00 AM
#48
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John, It's a hassle I could do without at this particular time but Jason is pushing me towards doing it. If you think the Shark Vent will do exactly what it say's on the tin I'd be happy to go with that and just do an intake refresh. So $64k questionJohn is what's your opinion on the Shark Vent?
11-11-2010, 05:50 AM
#49
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I've not tried it yet, although I do have one of DR's kits for my 86 15v. I have heard very good reports of the system that Roger sells, especially effective for the GTS. Even if you drilled the pistons, it would be highly recommended that you improved the crankcase ventilation of your engine.
For example, I don't think your early GTS has the improved venting to the cam covers, does it ?
For example, I don't think your early GTS has the improved venting to the cam covers, does it ?
11-11-2010, 09:03 AM
#50
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I've not tried it yet, although I do have one of DR's kits for my 86 15v. I have heard very good reports of the system that Roger sells, especially effective for the GTS. Even if you drilled the pistons, it would be highly recommended that you improved the crankcase ventilation of your engine.
For example, I don't think your early GTS has the improved venting to the cam covers, does it ?
For example, I don't think your early GTS has the improved venting to the cam covers, does it ?
11-11-2010, 05:41 PM
#53
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11-11-2010, 05:49 PM
#55
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11-11-2010, 07:26 PM
#56
Nordschleife Master
I was about to foolishly say that the first GTS's would have been the US's Early 93's but that ignoring the fact that the GTS was sold as a 92 model for ROW.
The "Early 1993" USA GTS's are really just 1992's with a window sticker stating 93.
When did the GTS first go on sale for the US?
The "Early 1993" USA GTS's are really just 1992's with a window sticker stating 93.
When did the GTS first go on sale for the US?
11-11-2010, 09:15 PM
#57
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Just for the record I do not sell a Provent/Sharkvent kit.
I bought mine from DR and it solved my smoking issue and helped my oil consumption.
Highly recommend DR's system.
I bought mine from DR and it solved my smoking issue and helped my oil consumption.
Highly recommend DR's system.
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
11-11-2010, 11:02 PM
#59
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It will be awful funny to go through all the cost and hassle of engine out rebuild, only to put it back together and still have blue smoke and oil consumption.
Do the crankcase vent and recirculation first. You will want it after the engine work anyway, and it's much cheaper than all the work you're contemplating.
The crankcase ventilation and recirculation system on these engines are not up to snuff anyway. In the GTS which tends to have a bit more blowby, and a bit more oil entrainment the stock circulation system was completely inadequate for even slightly used engines. The ProVent is a design based on the known problems of crankcase venting on the 928 engine. Start with that, and go from there.
Do the crankcase vent and recirculation first. You will want it after the engine work anyway, and it's much cheaper than all the work you're contemplating.
The crankcase ventilation and recirculation system on these engines are not up to snuff anyway. In the GTS which tends to have a bit more blowby, and a bit more oil entrainment the stock circulation system was completely inadequate for even slightly used engines. The ProVent is a design based on the known problems of crankcase venting on the 928 engine. Start with that, and go from there.