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Location:
sydney, the shire
Registered:
June 2004
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: claryfiying 5k specs
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Thu, 18 August 2005 10:34
 
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| dave_ke30 wrote on Thu, 18 August 2005 20:19 |
as far as i know 5k's have hydraulic lifters but solid lifters would better suit the application?
5k's have dished pistons? if flat top pistons were obtained could a worked 4k head be used?
just how much compression is too much compression?
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that depends on rpm. some ppl use hydraulics but up high they may pump up... if you go solid you need a lightweiht option, not just lockign the original lifters
yes. yes. no real difference in ports, but free higher compression (after pistons).. a 3k head could also be used if hogged out a bit. 3K CCV=33mls, 4K CCV=36mls
that depends on your cam. it's dynamic compression that is important..
with the combustion chamber mods on my head (see my page), and camtech 609 cam (435 lift, 231/235@50thou) i had 10.2CR, but i think i could get away wth 11 befor epinging.. less duration = less compression (required) 
Cya, Stewart
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Location:
sydney, the shire
Registered:
June 2004
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: claryfiying 5k specs
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Fri, 19 August 2005 14:48
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depends how high you want to rev the sucker...
if you get the lifters to the weight of a 4K's, then it should be happy to rev to 7000-7500.
for above that you will want to either lighten the lifter more, or lighten the valves. 6mm stem valves will reduce valve train weight and mean you can use lighter springs same goes for alloy pushrods..
if you still have heavy lifters, i would not bother with alloy rods.. leave them till last, if at all..
basically, reduce moving weight and car will rev faster and higher for longer, and valvetrain is a big issue..
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