Guest buds260z Posted July 6, 2006 Share Posted July 6, 2006 can you bolt the nap z head to the L20 engine and can you tell me how. Quote Link to comment Share on other sites More sharing options...
auxilary Posted July 6, 2006 Share Posted July 6, 2006 uhm. what? Quote Link to comment Share on other sites More sharing options...
NZeder Posted July 6, 2006 Share Posted July 6, 2006 can you bolt the nap z head to the L20 engine and can you tell me how. I believe so. But the question would be why? The NAP Z cross flow heads are designed for economy/low polution = not a performance head, well that is what I am lead to believe. Quote Link to comment Share on other sites More sharing options...
olie05 Posted July 6, 2006 Share Posted July 6, 2006 http://www.oregontrail.net/~rond/tech_tips.htm here's some info. I assume you are talking about the L20B not the L20A. Quote Link to comment Share on other sites More sharing options...
slownrusty Posted July 6, 2006 Share Posted July 6, 2006 The NapsZ Head is good for one thing....door stop and boat anchor...ok thats two things. Please do not waste your time....I went there and the $$ I spent I regret...I ended up building a 180hp NAPS motor, but the cost of getting there was silly. Yasin Quote Link to comment Share on other sites More sharing options...
Mack Posted July 7, 2006 Share Posted July 7, 2006 I have an A87 or maybe its a W58? I cant remember, anyway, its a linered head but it has high quench chambers like a P79. for you 4 cylinder gurus, is this head worth anything? Its got a minor crack and needs some straightening, should it get scrapped or is it worth fixing? Quote Link to comment Share on other sites More sharing options...
NZeder Posted July 13, 2006 Share Posted July 13, 2006 I second and third the responses; why bother? Consider bolting a W53 or W58 L20B head to a LZ22E or LZ22S shortblock instead, it makes more sense and yes it can be done. DAW Guys please don't call the Z20/Z22/Z24 engine a LZ anything they were never called LZ engine. The LZ engine was in fact a rare factory Twin Cam head that was fitted to L14/L16/L18 and L20B bottom ends for works rally cars and also used in the formula pacific class of open wheelers in the 70's/80's see here for info on these head/engine http://www.datrats.com.au/lz_twin_cams.htm (I believe the blocks were also slightly different, ie they used fully counter weighted cranks, longer rods, different custom pistons, timing gear etc) Quote Link to comment Share on other sites More sharing options...
NZeder Posted July 15, 2006 Share Posted July 15, 2006 NZeder, I do have a question that you might know the answer to...it's a little off-topic but not too far...the LD20 4 cyl engine has a timing chain and the LD20II has a belt if I understand correctly. Do you know what was involved in the transition to belt? (I'd like to know if I can use LD20II components to convert my L20B and hybrid L/Z shortblocks to belt) It's more a curiousity on my part than finding fault with the double-row chain. DAW I don't know the answer to that one - it is a good question, I might know someone who can answer that - I will get back to you - watch this space. Quote Link to comment Share on other sites More sharing options...
NZeder Posted July 16, 2006 Share Posted July 16, 2006 I don't know the answer to that one - it is a good question, I might know someone who can answer that - I will get back to you - watch this space. Ok got some answers for you going to belt drive is realy a step backwards in terms of long term reliabilty .manufacturors design belt drives because it allows for shorter motors and lighter because of plastic covers .its not a bolt in job simply because the Ld20 11 is completly different to the L20b engine --even the bore and stroke are different as is the head (which cant be used on a petrol engine)and of course the oil pump design and drive is completly different .basicaly the entire front (cam drive end)of the motor has been redesigned to allow for a larger bore shorter stroke and still fit in the same engine bay ie same overall length .the Ld20 1 is of course just a super high compression L20b, apart from head and pistons most other bits are the same ,bearings bottom end gaskets too . actual block height of the Ld20 11 is shorter too .to convert L20b to belt drive --- custom rocker cover ,cam drive/seal mods ,entire cam drive cover custom made .heres a thought -- find a dohc head and adapt it to L20b bottom end (even if you have to chain drive it)at least youll find more power this way . by the way what were you hopeing to gain ? With the last statement - I have heard that a KA24DE head can be made to fit a L4 bottom end, I have no idea what is involved but I am trying to get a copy of a video of a complete engine on a Dyno that I believe exists. End Hi-Jack DAW - if I get that video I will post in a new thread Quote Link to comment Share on other sites More sharing options...
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