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Location:
Hornsby, Sydney
Registered:
October 2002
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2TG/3T hybred what pistons
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Fri, 13 February 2004 11:39
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i have a 2t3t hybred using a 260 2TG head. because of excess blow by i have removed the head to start rebuilding it but noticed it has 3T pistons in it which look a little flatter (lower comp) than the 2TG ones that i remember.
Can i use 2TG pistons safely?
Will it up my compression?
or am i just seeing things that may not be true?
thank you Roadrunner.
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Location:
Tasmania
Registered:
May 2002
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Re: 2TG/3T hybred what pistons
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Fri, 13 February 2004 12:16
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Search this forum a bit more, it has been covered many times.
3T pistons must be used together with a 3T crank.
2T and 2T-G pistons must be used with a 2T crank.
Generaly, when going from standard 2TG pistons to generic 3T pistons and crank, the compression will be increased a bit, from about 8.8:1 standard, to about 10 or 10.5:1.
Using the 3T setup, the cheapest is to use regular 3T-C pistons with the exhuast releif cut a bit deeper. You can get these in 86mm new.
2T-G pistons had different compression depending on the year and other things. Older ones were about 9.8:1, latter ones where 8.8:1, some where 8.4:1, some 8.3:1 I think. A standard 3T will have a compression of about 9 to one. Using this bottom end with a 2T-G head increases the compression because the 2TG head chamber is slightly smaller, 62 vs 68cc I think.
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Location:
Ballarat, Victoria
Registered:
March 2003
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Re: 2TG/3T hybred what pistons
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Fri, 13 February 2004 13:25
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yep thats right
talk to the untouchable hes doing the 2t/3t at the moment 
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Location:
Hornsby, Sydney
Registered:
October 2002
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Re: 2TG/3T hybred what pistons
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Sat, 14 February 2004 03:25
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thank you. thats very helpful
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