legendzcarclub Posted January 5, 2007 Share #1 Posted January 5, 2007 my engine blew on me the other day for some strange reason it hapened out of nowhere i was driving it all good in the night till about 3am and i wake up at 6am to go to work and my engine started making a loud noise like if a rod went out .......so now i am taking my engine out and instaling a L28 with my 2.4 head an E88 but i was told its a bad idea cause of the high compression and then with my cam that i have installed i was told it would be worse my engine wont last over a month and thats not even the bad part im planing on overhauling my old engine since it is the original matching block to my z ...but....i only have four pistons with the groves for the valves and two flat head pistons so i need to know if its a good idea and what i would need to do to make this engine combo work thanks....<a href="http://photobucket.com/" target="_blank"><img src="http://i25.photobucket.com/albums/c68/racerx240z/IMG_0083.jpg" border="0" alt="Photobucket - Video and Image Hosting"></a><a href="http://photobucket.com/" target="_blank"><img src="http://i25.photobucket.com/albums/c68/racerx240z/mikescam009.jpg" border="0" alt="Photobucket - Video and Image Hosting"></a> Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/ Share on other sites More sharing options...
Arne Posted January 5, 2007 Share #2 Posted January 5, 2007 First - in the US there are at least three different versions of the "E88" head, which I have heard referred to as "small chamber" (very late '71 and ''72), "large chamber" ('73 240Z) and 'big valve" ('74 260Z with larger exhaust valves). I don't know which you have, nor do I know whether the L28 you will be using has dished or flat top pistons. If you have dished pistons, you'll be OK with around 8-8.5:1 compression. But with flat top pistons you'll be pushing close to 10.5:1 which is fairly risky on pump gas. Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/#findComment-194750 Share on other sites More sharing options...
legendzcarclub Posted January 7, 2007 Author Share #3 Posted January 7, 2007 i have the 73 head.. cause my car was all original when i bought her off the original owner... but you know how young kids want to go fast and look good so i started adding parts to it so its not so original anymore but the engine wasnt swaped out for the fancy turbo set up or a big v8..... i wanted to keep the original engine in there for as long as i could after all we had together !!! but shes an early 73 ...... so what do you suggest run an electric pump and use a block off plate Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/#findComment-194919 Share on other sites More sharing options...
Phred Posted January 7, 2007 Share #4 Posted January 7, 2007 Legend,Arne had some good info, but I think compression is the least of your problems. Your pics show some of these potential killers. First, the pistons appear to show some piston to head clearence issues. The shinny areas where no carbon is present, is an indication the piston is slightly hitting the head. Not to mention the different dome styles, two with flat tops, the others with valve reliefs, indicate they came from different sets. That means they will probably have different compression ratio's, as well as possible Valve to piston clearence problems. More than likely the worst issue will be the piston weights will be different, causing a serious internal imbalance at speed. The other indicator is the red anodized valve spring retainers. Not a good idea for a street drivin engine, and questionable on a track only car. Which would make me question the springs and cam. How much lift? How much V/P clearence? How much spring pressure? How much pist./head clr.? And finally, how much compression? If you don't know these things, you have another engine that is blown up. It just hasn't happened yet. Please pick up a copy of Frank Honsowetz' "How to modify your Nissan/Datsun engine". Engine modifications can be frustrating and expensive. Once you become informed, its a lot of fun. Hang in there and do it right.Phred Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/#findComment-194947 Share on other sites More sharing options...
bloxman Posted January 17, 2007 Share #5 Posted January 17, 2007 For what its worth this site seems to have a lot of intelligent comments arranged in a sensible format.Therefore you have likely been there alreadyhttp://www.geocities.com/zgarage2001/engine.htmlBloxman Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/#findComment-195774 Share on other sites More sharing options...
76Datsun280z Posted January 17, 2007 Share #6 Posted January 17, 2007 It sounds like your engine may have blown the head gasket. Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/#findComment-195776 Share on other sites More sharing options...
e_racer1999 Posted January 17, 2007 Share #7 Posted January 17, 2007 It sounds like your engine may have blown the head gasket.the pistons look too dirty for that IMHO.anyway, as far as E88 on L28... that's what i'm doing.pros of this? square port head & higher compression ratio.cons? smaller ports = less flow.what i'm doing is porting out the head and putting 280 valves in it.of course everything i said here is up to speculation and opinion. Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/#findComment-195790 Share on other sites More sharing options...
ktm Posted January 17, 2007 Share #8 Posted January 17, 2007 Here is a great engine design utility. Just input the information and you can get an idea of what your static CR will be: http://www.ozdat.com/ozdatonline/enginedesign/Arne, I do not know where you are getting 10.5:1 CR with an E88 head (260z E88). The link I provided above, assuming flat top L28 pistons, L28 rods, L28 block, L28 cam, 1.25mm gasket and an L28 crank puts the CR at 9.7:1. Hell, even if you put an E31 head on there your CR is only 10.1:1. Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/#findComment-195797 Share on other sites More sharing options...
legendzcarclub Posted February 6, 2007 Author Share #9 Posted February 6, 2007 wel i got the engine to run last week it ran good but the mechanic that fixed it didnt know how to adjust the su's but it sounds like it has good power now i just need to find out what happened to my electrical stuff cause nothing wants to work Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/#findComment-198280 Share on other sites More sharing options...
e_racer1999 Posted February 6, 2007 Share #10 Posted February 6, 2007 ^i will take this time to plug ztherapy. get the videos!!! Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/#findComment-198342 Share on other sites More sharing options...
k5ride Posted April 16, 2014 Share #11 Posted April 16, 2014 I know this is an old post but I thought this might be a helpful tool to use for determining which head to use and figuring out your compression.lengine.zip Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/#findComment-445917 Share on other sites More sharing options...
siteunseen Posted April 16, 2014 Share #12 Posted April 16, 2014 Is it this one? OZDAT.com Engine Design UtilityI couldn't open your zip without downloading something. Link to comment https://www.classiczcars.com/topic/22855-l28-block-with-an-e88-head-good-or-bad-idea/#findComment-445924 Share on other sites More sharing options...
Wilbur
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