kiznook Posted September 27, 2007 Report Share Posted September 27, 2007 I'm planing my super special L motor build. But I need to decide, what should I do with the head? This will sound VERY noob-ish, but I figure I'll ask in public, and help contribute to the content of the site with an informative thread. likely build: 1.5" ports Z valves - what are the specifics on these? worth it? Mild cam - what is best? street car, mild revs, decent compression N/A Peanut or open, yet to be decided, Is there any open head that is better than the others, or are they all pretty much the same? At what point with a cam do I need to replace the rocker arms, springs, lash pads? and how do I know which ones I need? QUESTION #2: what head gasket is used for 87+mm bore?(z22+) Do you modify the Z gasket and use the L timing cover portion? brainstorm..... ENGAGE! Quote Link to comment
phatdave Posted September 27, 2007 Report Share Posted September 27, 2007 http://www.nismoparts.com/cart/?pn=m-11041-v9182 Quote Link to comment
banzai510(hainz) Posted September 27, 2007 Report Share Posted September 27, 2007 http://www.the620.com/html/tech/partnum.htm get a 1.5 inch port intake manifold and match port the head to 1.5 inch(SSSspec) not the Cannon brand 1.25 inch unless our keeping the head 1.25 intake On a L16/1820 use a closed chamber head LZ hybrids many use the U67 open chamber head which is 1.375 and ez to open up. Nismo head gaskets are expensize. Bryon510 knows what to do on the 510realm for the front cover/head gasket set up ask him. As for the Z valves if you got the money and trust the machinist to install everything perfectly But in my OPINION here I would not worry about the 1.73 valves. It adds cost/work for a 10-15% increase in area size. I think money can be betterspent of a good. I say GOOD set of sidedraft carbs. Quote Link to comment
Bleach Posted September 27, 2007 Report Share Posted September 27, 2007 I'd stick to the stock head on the KA24DE out of a Frontier ;) Quote Link to comment
hang_510 Posted September 27, 2007 Report Share Posted September 27, 2007 At what point with a cam do I need to replace the rocker arms, springs, lash pads? and how do I know which ones I need? QUESTION #2: what head gasket is used for 87+mm bore?(z22+) Do you modify the Z gasket and use the L timing cover portion? new cam = new parts! measure 2X and order accordingly. i started w/ manuf recommendations(isky) on the lash pads. easy to change if needed. i used the nismo 88.5mm HG for the LZ22(i have the part# if needed) have not installed, but it shouldnt need any mods. i went w/ the U67 (open-because i had it, and 2 spares) ported w/ bigger SS valves installed Quote Link to comment
datzenmike Posted September 27, 2007 Report Share Posted September 27, 2007 Stock open head... 8.5 P nut head........... 8.9 (just under) Not enough difference to cause much pinging and well worth the larg quench area that homogenizes the fuel/ air mix anyway and promotes more eficient burn, more even cylinder temps, less hot spots that lead to pre ignition in the first place. All other things equal on a stock displacement L20B... go P nut. Quote Link to comment
kiznook Posted September 27, 2007 Author Report Share Posted September 27, 2007 well, It's likely going to be a longrod 2.1, or just a lz22. Unless I can find a set of DCOEs, I'll be sticking with the DGV for a while (future upgrade on same motor) I probably won't use the big valves, like Hainz said, it'll be a lot of work (money) for little overall gain. I'll probably port it out to 1.5" and possibly work the factory manifold over a bit as well (until I can find sidedrafts) hmmm....lot's of thinking to be done, and reading! Quote Link to comment
hang_510 Posted September 27, 2007 Report Share Posted September 27, 2007 i know your looking for webers, but this is a good deal...$500 mikunis w/ manifold http://sacramento.craigslist.org/pts/432865694.html Quote Link to comment
kiznook Posted September 28, 2007 Author Report Share Posted September 28, 2007 yeah, I saw that. "Pending pickup" he probably wouldn't go for a $500 shipped offer :D And like I've said before, I have a sweet hookup on weber parts and tuning help. with everyone telling me webers suck, I'm surprised there isn't a bunch of people trying to sell them Quote Link to comment
kiznook Posted September 28, 2007 Author Report Share Posted September 28, 2007 Why can't I get ANY of those part numbers to work on Nissanparts.cc? Quote Link to comment
datzenmike Posted September 28, 2007 Report Share Posted September 28, 2007 Get this Nissan head... http://i138.photobucket.com/albums/q251/datzenmike/LZ-NEW_STAINLESS_VALVES_small.jpg[/img]"] ... fits L13,16, 18, L20B, Z18, 22, 24, KA (I think) Quote Link to comment
phatdave Posted September 28, 2007 Report Share Posted September 28, 2007 Where? How much? Quote Link to comment
kiznook Posted September 28, 2007 Author Report Share Posted September 28, 2007 yeah right. You find me one AND the $$ to buy it. Someone should remanufactre the giken design...too bad Datsun people are so cheap and no one wants an L motor Quote Link to comment
DISLEXICDIME Posted September 28, 2007 Report Share Posted September 28, 2007 there only 10,000 dollars Quote Link to comment
datzenmike Posted September 28, 2007 Report Share Posted September 28, 2007 It's NOT an OS Giken head. The Giken design has the intake and exhaust on the opposite side to this one. But it is close. OSGiken head below: http://i138.photobucket.com/albums/q251/datzenmike/OS_GIKEN_TWIN_CAM_small.jpg[/img]"] Quote Link to comment
ppeters914 Posted September 28, 2007 Report Share Posted September 28, 2007 too bad Datsun people are so cheap and no one wants an L motor Uh, oh....don't let Hainz hear you say that! :eek: Quote Link to comment
kiznook Posted September 28, 2007 Author Report Share Posted September 28, 2007 It's not anything new. When it comes to big money builds it's become more favorable to ditch the L and drop in a KA or SR WHY DONT THE PART NUMBERS WORK??? i tried every combination of Ms and nothing worked. WTF? this is making me look/feel dumb! Quote Link to comment
datsunaholic Posted September 28, 2007 Report Share Posted September 28, 2007 Because they're not stock parts, they're NISMO parts. You need to use this part number type: http://www.nissanparts.cc/cart/?pn=m-99996-m1155 The part number has 2 M's. M-99996-M1155 Quote Link to comment
OL YELLER Posted September 28, 2007 Report Share Posted September 28, 2007 Because they're not stock parts, they're NISMO parts. You need to use this part number type: http://www.nissanparts.cc/cart/?pn=m-99996-m1155 The part number has 2 M's. M-99996-M1155 And that my friend is the reason that Doug is known as "DA MAN"...(Or Mr. Datsunaholic) Quote Link to comment
Bleach Posted September 28, 2007 Report Share Posted September 28, 2007 And that my friend is the reason that Doug is known as "DA MAN"...(Or Mr. Datsunaholic) BAM!!! :eek: Quote Link to comment
hang_510 Posted September 28, 2007 Report Share Posted September 28, 2007 with everyone telling me webers suck all carbs suck, thats why id rather be blown :P i have webers on the running motor & have no issues with them...or anything to compare then too as the miknunis arent installed yet :rolleyes: Quote Link to comment
kiznook Posted September 28, 2007 Author Report Share Posted September 28, 2007 duh! that system is WAY too sensitive. The only combination I didnt try was M-9... stupid little "-" GRRR. Thanks 'Holic Quote Link to comment
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