I need some help...i was thinking of building a high compression KA....im gonna use Single cam piston,crower rods and aftermarket cams(not sure what kind yet) my questions what things outta both engines are better, things like valves,valve springs, stuff like that...i dont have the money to spend on titanium valve springs so just trying to find out which stuff is better out of which motor...o also how much does it cost to have a head ported intake/exhaust valve openings......thanks

 

well man, if you're gonna use a SOHC, here's my setup...kinda pricey but it works very nicely:
-wiseco 10.5:1 pistons ($500)
-crower connecting rods($500)
-nismo R5 cam($317)
-solid lifter conversion(parts and labor)
-stiffer springs (bunch of brands, different prices)
-stainless valves ($150)
-i also got a 5-angle valve job, P&P to help the breathing
its expensive to built a NA project...u could turbo it for the same price as fully building it up. I personally like the high revving and rediculously nice sounding engine. PM me with any ?'s about anything

 

I believe he has a DOHC and will use SOHC pistons for 11.1:1 compression ratio in his DOHC.
Porting and polishing is great, until you take too much metal off the head. Then you have warping and overheating issues. When I got my head done, I requested a port-matching and polishing, with a light job on the head itself. Chris May's car (2 motors I believe), a friend Jeff's KA-T in Conneticutt, and a couple others have blamed motors on the headwork.
What are the specs on Nismo cams? I know JWT is up there, and regrinds from PDM are really lumpy but make power up top. You'll need some machine work on the rotating assembly as well as crank work. High revving KA's don't seem to last long, and large cams won't making daily driving feasible. If you really want, look at rebello stuff and see if you can find any specs on their motors. They made 280whp NA KAs for race.
-Jeff

 

Jeff- the nismo R5 cam is a huge 288/292...it requires all new head internals.

 

in case you were lazy, I bothered

http://www.race-cars.com/engsales/ot...59606728ss.htm

 

if you want a happy high revving ka that would last longer than stock specs then im thinking a set of custom 11:1 "short" pistons with a longer rod, effectively changing the stroke ratio a little. carillo rods... mmmmmm... from the looks of stock pistons you MIGHT be able to get rod thats 5mm longer but then you have to take into consideration of rod to block interferance. well thats what i have been looking into lately. if you have something that you want to be rev happy then you might want to go the route of a dry sump oil system. but now we are talking serious money. nothing that i know of is interchange able between the single cam and twim cam heads. i do believe the valve spring seats are the same. i think i used some single cam ones in my twin cam. cant remember though.

but if you do touch the bottom end then youll need to get it balanced, which is even more money.

 

the long stroke of the ka will keep it from making power up top


get a de stroker ka20 if you want tom ake power up top.

 

then you lose a lot of displacement. also how easy is it to get a ka20 crank. i was hearing something about a ka22. what cars are these from?

 

its amazing what i got by typing ka20de into google....

http://www.nissan-global.com/EN/STOR...-MC109,00.html

KA20DEƒGƒ“ƒWƒ“
Å‚o—Í 88kWi120PSj/5200rpm
Å‘åƒgƒ‹ƒN 169NEmi17.2kgmj/2800rpm
i“dŽq§Œä4‘¬ƒI[ƒgƒ}ƒ`ƒbƒN/5‘¬ƒ}ƒjƒ…ƒAƒ‹j

¡�_‹«‚ɂ₳‚µ‚¢Aƒpƒƒ tƒ‹&ƒNƒ�_[ƒ“KA20DE
�_‹«‚Ö‚Ì”z—¶‚Æ—Í‹�_‚³� �Ì—¼—§‚ð–ÚŽw‚µ‚Ä�_J”�_‚³� ��ꂽKA20DEBæ—pŽÔ‚Å‚ÍŽå—¬� ��Æ‚È‚Á‚Ä‚¢‚餃cƒCƒ“ƒJƒ€ {ECCSiƒGƒ“ƒWƒ“W’�_“dŽq§Œä ƒVƒXƒeƒ€j‚ð¤—pŽÔ‚ō̗p‚ µ¤‚o—͉»‚ƒᑬƒgƒ‹ƒN� �ÌŒüã‚ð}‚è‚Ü‚µ‚½B‚»‚ ÌŒ‹‰Ê¤‰^“]«”\¤Žn“®«”\‚¨‚æ‚ÑŽÀ—p� �æ‚Å‚ÌŽg‚¢ŸŽè‚ª�_i’i‚ÉŒü ã‚µ‚Ä‚¢‚Ü‚·Bi•½¬10”N ”roƒKƒX‹K§‘Ήžj

 

has it been proven to swap in though. like flywheel bolt patterns and what not. whose done it.

i just gave my .02 cents on how to affectly change the r/s ratio without losing displacement.