Andrew's 91GT Engine Thread
#31
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The only options that I know of is Cometic, Victor Reinz, and OE (which may be made by Reinz). There have been many discussions in regards to the Cometic (use search) - some good, some bad. I'm leaning toward the OE set just becasue I know they work this long - would hate to put something that may or may not work. I'm sure I'll solicit other's opinoins before too long - but those are like elbows and a$$holes.... everyone has one.
#32
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i agree and i think it may be a while longer before the numbers of blown sharks with headgasket experiences comes up enough so the discussion becomes anything more than an experience from one or two. ive heard the big problem with the 928 and headgaskets is if there is any aluminium corrosion on the block side.
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You can get MLS gaskets made in the US as well. They are superior to all other gaskets. However, to run a set of them, the block and heads would both have to be machined. They require mirror smooth surfacing on both sides to seal correctly.
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In 1977 I believe.
Or did you mean from 1977 with an unknown end Year?
/Peter
#38
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Can someone tell me the best way to measure the bore? I want to make sure I didn't balloon or otherwise change the cylinder.
I used my digital micrometer and it measured 99.6mm IIRC - same as the other cylinders. Specs say it's supposed to be 100mm. Is there a difference between a hot and cold engine?
I used my digital micrometer and it measured 99.6mm IIRC - same as the other cylinders. Specs say it's supposed to be 100mm. Is there a difference between a hot and cold engine?
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But other than that, you are exactly correct.
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Can someone tell me the best way to measure the bore? I want to make sure I didn't balloon or otherwise change the cylinder.
I used my digital micrometer and it measured 99.6mm IIRC - same as the other cylinders. Specs say it's supposed to be 100mm. Is there a difference between a hot and cold engine?
I used my digital micrometer and it measured 99.6mm IIRC - same as the other cylinders. Specs say it's supposed to be 100mm. Is there a difference between a hot and cold engine?
http://www.ikh.fi/hallinta/pdf_tiedo...ategoria_id=13
Product number SC013 is set of spring loaded telescopic tools which are inserted into cylinder bore and locked to position while there. Then tool is removed from cylinder and its diameter is measured with standard micrometer which is large enough. Result isn't very accurate and probably will not be good enough to say even what tolerance group bore is not to mention if it is in small or large end of the said group.
For better measurment you need something like SC080, standard dial indicator like SC030 and micrometer like SC031 shown in page 6. Measurement is taken by inserting SC080 into cylinder bore same way as cheap spring version while dial indicator is installed at its upper end. Dial is read and result noted down. Number in itself does not tell anything directly. To find out actual measurement SC080 measuring head is put between micrometer, micrometer is turned until dial on other end of SC080 shows exact same number as it did inside cylinder and this postions is read from micrometer and its actual diameter for measured cylinder. This kind of setup is cheapest way I managed to find which will get to precise enough level to be useful in measuring diameter of 928 blocks. SC080 alone was close to $500 in here so there really isn't cheap way to check bore.
There are much more expensive digital bore gages available but those are really too expensive for simple hobby use. Check out for example http://www.mitutoyo.com.