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Old 23-02-2009, 22:32   #1
naughtyrs
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87mm pistons

I see wiseco sell 87mm pistons for the 4g63 block running 88mm stroke, I know the block walls would be getting weaker but would ihave problems?
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Old 23-02-2009, 22:50   #2
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Quote:
Originally Posted by naughtyrs View Post
I see wiseco sell 87mm pistons for the 4g63 block running 88mm stroke, I know the block walls would be getting weaker but would ihave problems?

Problem is getting a decent gasket.
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Old 23-02-2009, 22:58   #3
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Custom only job then?
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Old 23-02-2009, 23:04   #4
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Quote:
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Custom only job then?
Yes people are having similar probs on 4G64s with 87mm pistons. Try to stay 86mm if you can. Also like you say the wall get thin and deflection in the block "can" become an issue. Having said that there are gaskets available but its knowing which one to go with! If its lowish power you might get away with a Commetic.
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Old 23-02-2009, 23:16   #5
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ant @indigo sells 86.5mm pistons
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Old 24-02-2009, 06:53   #6
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I have the same problem with a 4g64 block, what about Power Enterprise gaskets? They have a 87 mm one, is it good?
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Old 24-02-2009, 08:41   #7
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Problem is getting a decent gasket.
Not at all, Power enterprise do an 87mm x 1.5mm gasket
I have used these in a couple of builds and seem to be perfect for the job.

http://www.evasivemotorsports.com/Me...&Store_Code=EM

Cometic also do an 87mm but I have read that there some issues with them.
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Old 24-02-2009, 09:47   #8
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Can someone clarify this for me:

I understand an Evo head can be bolted straight onto a 4G64 block.

I also understand that 4G64 blocks are routinely bored out to 87mm (they are 86mm standard, aren't they?).

So, if my understanding above is correct, why is deflection and wall thickness an issue on the 4g63 block, but not on the 4G64 block?
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Old 24-02-2009, 10:34   #9
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Off the top of my head, because the 64 block is bigger as standard (i.e 86.5mm) compared to the 63 having 85mm stock bores.

Or it could just be a stronger block, as it was made for GDI petrol engines which work similar to diesel engines.

Last edited by cossie1; 24-02-2009 at 15:40..
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Old 24-02-2009, 10:37   #10
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Off the top of my head, because the 64 block is bigger as standard (i.e 86mm).

Or it could just be a stronger block, as it was made for GDI petrol engines which work similar to diesel engines.
Stock bore for the 4G64 is 86.5mm.
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Old 24-02-2009, 10:59   #11
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so who has run 87mm pistons on a 4g63 block?
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Old 24-02-2009, 11:29   #12
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so who has run 87mm pistons on a 4g63 block?
I don't know of anyone recently but I know that RC had
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Old 24-02-2009, 11:33   #13
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Do i or dont i? 87mm on 88 mm stroke is getting on for a theoretical 2.1litre and nearly oversquare.
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Old 24-02-2009, 11:34   #14
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Quote:
Originally Posted by Ian6 View Post
Stock bore for the 4G64 is 86.5mm.
All ones I have had are 86mm stock

Quote:
Originally Posted by youngsyr View Post
Can someone clarify this for me:


So, if my understanding above is correct, why is deflection and wall thickness an issue on the 4g63 block, but not on the 4G64 block?
It is also a problem on 4G64 in high power applications.
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Old 24-02-2009, 11:53   #15
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Quote:
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All ones I have had are 86mm stock



It is also a problem on 4G64 in high power applications.
Ross,

From the info I have they are 86.5mm

From the Wiseco site:

4G64 w/ 4g63 head 2.4L
Kit Part # Bore MM / Inch Over Sizes Stroke Rod Length Comp Height Head cc's Dome/Dish Volume Gasket Thickness Deck Clearance Block Ht. Comp. Ratio Pin Diameter Ring # Foot Notes
K564M865 86.50 / 3.406 Std. 3.937 5.905 1.379 47 -22 .042 .003- 9.255 8.8:1 .827 8650xx 1
K564M87 87.00 / 3.425 .020 100 150 28.7 47 -22 1.1 .076- 235.07 same 21mm 8700xx 1
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Last edited by Ian6; 24-02-2009 at 11:54..
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