need help deciding on bore and brand of pstons.

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need help deciding on bore and brand of pstons.

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need help deciding on bore and brand of pstons. - 9/30/2007 12:49:24 PM

97spydergs

Posts: 47
Joined: 2/3/2007
Status: offline

ok so heres the deal i was told that in my 4g64 i can run 63 pistons since they are almost i dentical other than it being stroked and "slightly" bored from the factory. i want to change mine since they are known to be verry weak and prone to breakage since there skirt is so thin compaired to the 4g63 pistons whos skirt is nice and wide.

But what i need is your advice on what piston bore i should choose. since the 4G64 has a slightly larger bore (4G63 is 3.347" (85.0mm), 4G64 is 3.4055"(86.5mm) what would be your sugestions? i dont know how much over bor pistons i need for the 4g63 to match the pistons in my 4g64

Post #: 1

RE: need help deciding on bore and brand of pstons. - 9/30/2007 1:09:19 PM

Sebba

Posts: 14383
Joined: 2/20/2006
From: San Antonio, TX
Status: online

You have a 4G64???

_____________________________

These cranks are made for walkin'', and thats just what they''ll do, one of these days these cranks are gonna walk all over you

(in reply to 97spydergs)

Post #: 2

RE: need help deciding on bore and brand of pstons. - 9/30/2007 1:14:37 PM

97spydergs

Posts: 47
Joined: 2/3/2007
Status: offline

yes i do i have the 4g64 and i need to know what bore 4g63 pstons will work with my bore

(in reply to Sebba)

Post #: 3

RE: need help deciding on bore and brand of pstons. - 9/30/2007 1:15:57 PM

Sebba

Posts: 14383
Joined: 2/20/2006
From: San Antonio, TX
Status: online

No they wont i believe.

You need to look for pistons for a 3g GS or something

_____________________________

These cranks are made for walkin'', and thats just what they''ll do, one of these days these cranks are gonna walk all over you

(in reply to 97spydergs)

Post #: 4

RE: need help deciding on bore and brand of pstons. - 9/30/2007 1:31:13 PM

97spydergs

Posts: 47
Joined: 2/3/2007
Status: offline

i believe they will and have talke to many who say they will but what they say is it will work since the pins are the same diamiter and every thing is identical from piston to piston the only diff is the length of the skirt.and they say that i just need a 2g 4g63 piston in the right bore hence the i need to know what bore i need since i havent orderd forged pistons.the factory bore specs between motors goes the 4G63 is 3.347" (85.0mm) and the 4G64 is 3.4055"(86.5mm)

< Message edited by 97spydergs -- 9/30/2007 1:33:46 PM >

(in reply to Sebba)

Post #: 5

RE: need help deciding on bore and brand of pstons. - 11/12/2007 8:15:25 PM

w_houle

Posts: 11
Joined: 10/29/2007
Status: offline

If you could find 4g63 pistons that are .30 over and have your engine bored to match than the only thing I would make sure is that the wrist pin on the piston is the exact same distance from the top of the piston or expect a change in compression ratio, but otherwise...
4G63 is "3.347 (85.0mm), 4G64 is 3.4055(86.5mm" pretty much sounds like you would have to find a set of .10 over rings

(in reply to 97spydergs)

Post #: 6