GTS engine block
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Cruisin'
Joined: Jan 2005
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From: Sweden
GTS engine block
Hello -
I am new to this forum, but I am merely a new 928 owner. I have a problem regarding my GTS. The problem is that some second rated German so-called specialist (even recommended by the official network which to me is quite absurd - if anyone wants to know their name, let me know. Or, I might as well just post their name, anyone might know who they are) have destroyed the block of this car by replacing the alusil coating with steel. (without modifying/changing pistons/pistonrings) My problem (or rather their problem, but that's a long story involving solicitors, mechanics and other various knowledgeable people) is that it needs replacing and it might be a problem sourcing another GTS block. So, does anyone here know if it is possible to use a GT/S4 block (while preserving the 5.4 litre volume) which is far easier to come by?!
Regards Ola Nigard, Sweden
I am new to this forum, but I am merely a new 928 owner. I have a problem regarding my GTS. The problem is that some second rated German so-called specialist (even recommended by the official network which to me is quite absurd - if anyone wants to know their name, let me know. Or, I might as well just post their name, anyone might know who they are) have destroyed the block of this car by replacing the alusil coating with steel. (without modifying/changing pistons/pistonrings) My problem (or rather their problem, but that's a long story involving solicitors, mechanics and other various knowledgeable people) is that it needs replacing and it might be a problem sourcing another GTS block. So, does anyone here know if it is possible to use a GT/S4 block (while preserving the 5.4 litre volume) which is far easier to come by?!
Regards Ola Nigard, Sweden
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Hi Ola,
good move to seek information here, theres a lot of knowledge shared on this forum.
I'm not the person to answer your question but I'm sure there are others with better knowledge in this area.
Cheers/Peter
good move to seek information here, theres a lot of knowledge shared on this forum.
I'm not the person to answer your question but I'm sure there are others with better knowledge in this area.
Cheers/Peter
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did the block pics Errka showed have notches in the block for rod or piston clearance..(or something like that)...?...
Later,
Tom
midlman@rennlist.net
89GT
Later,
Tom
midlman@rennlist.net
89GT
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From: New Zealand
tom, the pics showed both notches in the lower cradle for con rod clearance and also breather holes between the crank main bearing supports. it stands to reason that if an S4 can be stroked to 6.0 litres then it can be stroked (with a factory GTS crank) to 5.4, and this is what many people have acomplished.
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So why then did Porsche put the notches in the cradle? If the 6.0 stroke clears on the regular block? why would a 5.4 stroke not clear on the GTS block?
later,
Tom
midlman@rennlist.net
later,
Tom
midlman@rennlist.net
Originally Posted by drnick
tom, the pics showed both notches in the lower cradle for con rod clearance and also breather holes between the crank main bearing supports. it stands to reason that if an S4 can be stroked to 6.0 litres then it can be stroked (with a factory GTS crank) to 5.4, and this is what many people have acomplished.
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Two links to previous conversations with few pictures:
https://rennlist.com/forums/928-forum/180221-so-i-think-i-bought-a-gts-crank.html
https://rennlist.com/forums/928-forum/166224-block-build-and-use-dates.html
There are few differences to S4/GT block. Factory added three holes next to each main bearings so that air can pass to next chamber when piston comes down. Lower part has small cuts for connecting rods on both sides. Cuts for the rods should be easy to make. Three holes might be more difficult as surrounding areas is different in older casting. Especially where those plugs attach at rear of block. I wouldn't settle for S4/GT.
I might have source for unused spare GTS block in Germany. It's expensive but if you do not have to pay yourself...
https://rennlist.com/forums/928-forum/180221-so-i-think-i-bought-a-gts-crank.html
https://rennlist.com/forums/928-forum/166224-block-build-and-use-dates.html
There are few differences to S4/GT block. Factory added three holes next to each main bearings so that air can pass to next chamber when piston comes down. Lower part has small cuts for connecting rods on both sides. Cuts for the rods should be easy to make. Three holes might be more difficult as surrounding areas is different in older casting. Especially where those plugs attach at rear of block. I wouldn't settle for S4/GT.
I might have source for unused spare GTS block in Germany. It's expensive but if you do not have to pay yourself...
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From: Helsinki, Finland
Originally Posted by Tom. M
So why then did Porsche put the notches in the cradle? If the 6.0 stroke clears on the regular block? why would a 5.4 stroke not clear on the GTS block?
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Cruisin'
Joined: Jan 2005
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From: Sweden
Thanks for all the helpful advices. So I believe it might then be best to try to source a GTS block. Or, I could try to use the current one with a new bore?
The German "specialist" is called "Sportwagen Eckert" - does anyone know them?
The German "specialist" is called "Sportwagen Eckert" - does anyone know them?
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From: California
