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Location:
Brisbane
Registered:
October 2002
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adding squish area
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Mon, 17 January 2005 11:36
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has anyone here added squish area tyo a cylinder head that was originally a HEMI head.
i am asking because the 18RG can only really handle 10-10.5:1 comp on our fuel, i wanna run about 10-11:1 but reliably, this is just an idea.
i have the means and opportunity to do it a the moment, i will be putting my worked head onto a new bottom end i am building at the moment.
and while the head is off i'd like to try a minor squish area experiment, something mild like a std 16V 4AGE head, or maybe a G4CN hyundai head.
i know bill sherwoods site has some info on it, i have read this and would like to pursue it
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Location:
Melbourne
Registered:
March 2003
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Re: adding squish area
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Mon, 17 January 2005 11:38
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try a higher grade pulp like bp ultimate 98 octane, or is it pinging on that already?
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Location:
Brisbane
Registered:
October 2002
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Re: adding squish area
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Mon, 17 January 2005 11:56
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i'm currently having no problems at all, i only have about 9:1 compression, but if u wanna run 11:1 or so u need avgas/methanol, i dont wanna run that.
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Location:
Castle Hill, Sydney
Registered:
February 2004
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Re: adding squish area
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Mon, 17 January 2005 12:34
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i've got spot on 10:1 comp in the hybrid, and on 98 octane, no pinging problems, but it wil always run on when you turn it off so i wouldnt wanna go any higher, unless you always want to add octane booster?
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Location:
Terrigal
Registered:
May 2002
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Re: adding squish area
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Mon, 17 January 2005 22:05
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You should try having a chat to Jason - Yellorolla, as he was working on a 3t-gte head that had some serious changes to the squish area.
Cheers
Joel
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: adding squish area
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Mon, 17 January 2005 22:42
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also remember that it's the 'dynamic compression' not the 'static compression' that is important.
i run 10.2:1 in my 4K motor with lots of advance (20deg static timing), and have never had it ping.. i did smooth and reshape the chamber (unshroud valves etc) and run on 98, but due to my cams, i have a lower dynamic compression (65 deg overlap)
what better excuse.. "honey the cars pinging again, i think i need to fit a bigger cam  "
Cya, Stewart
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Location:
Brisbane / Gold Coast
Registered:
May 2002
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Re: adding squish area
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Tue, 18 January 2005 09:41
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Squish is good.
Helps promote the right sort of turbulence.
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Location:
Brisbane
Registered:
October 2002
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Re: adding squish area
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Tue, 18 January 2005 10:57
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weel, what sort of shape do u guys think i should run with my below listed specs, power band of about 3000-7000
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