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Old 03-03-2017, 02:39 PM
87gtNOS 87gtNOS is offline
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Default Low comp. pistons vs. head shim APEX

which would be better when doing rods and pistons....head shim or low compression pistons?
I'm doing rods and pistons this summer in my 2012 Apex....
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Old 03-04-2017, 05:12 PM
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If you are doing pistons anyway, do low comp. Going to run big boost? Do upgraded rods as well. Had Apex with both and think throttle response was better with pistons. Could have been trying to justify the purchase.
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Old 03-06-2017, 09:09 AM
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Also headshim is less reliable compared to low comp pistons in terms of the head gasket, headshim has potential for 2 sealing surfaces for sale while low comp pistons leaves the original sealing surface and single head gasket.
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Old 03-06-2017, 03:10 PM
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Headshim is just fine for reliability. I was more scared to do low CR pistons and re-nikasil the cylinders to do it 'right'. Also pick your pistons carefully and rings so they don't knock or burn oil. Stock with headshim is hard to beat up to about 15 psi. Over 15 psi you need rods and pistons and take the trade off of some possible slapping and oil consumption.
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Old 03-06-2017, 11:25 PM
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Quote:
Originally Posted by kinger9 View Post
Headshim is just fine for reliability. I was more scared to do low CR pistons and re-nikasil the cylinders to do it 'right'. Also pick your pistons carefully and rings so they don't knock or burn oil. Stock with headshim is hard to beat up to about 15 psi. Over 15 psi you need rods and pistons and take the trade off of some possible slapping and oil consumption.
I ran 17-18 psi on my apex regularly, odd spike to 20#, elevation ~5500feet all she had was a head shim, absolutely no issues
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Old 03-07-2017, 08:34 AM
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If you use a head shim which IMO is fine up to 17 lbs on an Apex, use a stainless steel one, I've blown out an aluminum one before.


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Old 03-07-2017, 09:19 AM
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Thanks guys for the input.

I was thinking CR pistons from Hurricane which use the stock Yamaha rings.
Along with Carillo Rods...

I assume the pistons he sells for this (10 to 1, I think) are suitable for NO headshim and a 290 kit? I know he can answer that when the time comes I guess....
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Old 03-07-2017, 09:21 AM
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Quote:
Originally Posted by M5- View Post
If you use a head shim which IMO is fine up to 17 lbs on an Apex, use a stainless steel one, I've blown out an aluminum one before.


M5
I have whatever headshim it is that comes with the MCX 290 kit in it right now....I didn't install it, so I'm unsure the material.
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Old 03-07-2017, 09:24 AM
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I have run about 13.6 psi....on 91 octane (with maybe some Shelbourne fuel additive, not sure if it works!) and that 13.6 could also be a spike from letting off the gas....but anyways, I just want to build this motor with rods and pistons ready for C12 and about 16 psi boost for grudge racing!
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Old 03-07-2017, 07:44 PM
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Old 09-14-2017, 11:06 PM
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Old 11-19-2017, 04:31 PM
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Old 11-20-2017, 06:42 AM
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