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Thread: Wierd Engine combination in 280ZX

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    Registered User stevegee's Avatar
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    Default Wierd Engine combination in 280ZX

    Hi All, I recently purchased a restorer 1982/02 Mark 2 series 280ZX 2+2. The engine was out and was picked up at a later date by a friend and when unloading it from the trailer I noticed it did not have the traditional square rocker cover normally fitted to series 2 engines, further on examination of the paper work that came with the car, I discovered that the engine number was prefixed by L24 and not L28. On examining the engine sure enough I had a "dead ringer" looks like an L28 but was an L24 bottom end complete with odd offset oil filter mounting and wait for it " a bypass oil cooler hose". What I need to know from the experts is what am I likely to find with this engine??? I will explain further.. The head is an N42 complete with new welsh plugs.. The injection manifold is Mark 2 280zx for sure. I went to the kiwi website where they have a neat engine "what if " play thing and punched in all the numbers (check site is http://www.zclub.org.nz/links.htm) the engine calculator is reallty neat and allows any combo of head/pistons/block L24/L26/L28. So what am I likely to find in my L24 hybrid?? What car did it come from seeing it has an Enzed Oil hose high pressure inlet and outlet (bypassed).. How can I fit an oil cooler to take advantage of this mod. To asses the engine capacity, How do I measure stroke and bore without taking head off. FYI the car runs on LPG and ULP dual fuel and I am told th L24 block N42 combo is the best there is is a really clean, quiet high reving engine with very smooth harmonics.. Any comments thanks or have I bought a LEMON??
    Last edited by stevegee; 12-01-2003 at 11:08 PM.
    Steve Gee

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    I got 280zx Fever 280zx Fever's Avatar
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    Hmmm well thats strange... never heard of such a hybrid..

    Not know anything about it i cant really help you out

    Oh topic, i finally got myself a car for parts locally for the sum of $50 complete with a p90 head SCORE hehehe Thanks for your help though
    1979 280zx Fairlady Z
    HGS130-000713
    L28-306538

    1981 280zx
    HGS130-193087
    KHGS130MBC

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    Registered User stevegee's Avatar
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    Default head job

    Great on the acquisition, better than running to the WA/SA border for sure Tell me about these heads then?? Where are the identifying marks and what should i look for in all me mottly collection?

    So far have an N42 on an L24 an N42 on an F54. What is likely to be on the mark 1's?? Where are the cast marks located?? The head on Zedman pictured was reconditioned in 1999 so maybe I got a good head? The rebuild runs ULP/LPG and I suspect it is high compression and set up for LPG and ULP. I got all the gas cyclinders in the deal and the LPG is compliant plated..so I will be able to own the car and drive it on LPG at 35 cents per litre
    Last edited by stevegee; 12-02-2003 at 11:32 AM.
    Steve Gee

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    Former frequent poster sblake01's Avatar
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    That engine sounds a bit like the L24E that was used in the USA in the 77-79 810 and the 80-84 Maxima. I have a 79 810 2dr. with that engine. It has the offset oil filter angling up and forward but no provision for a cooler. It has an N47 head and the 280z/zx type fuel injection. It's all stock and the engine has never been out of the car. It only has 80000 miles on it. Though it is some 400cc smaller than my 78 280Z engine, it's tough to notice any performance difference between the two. In fact I think the L24E in my 810 is a tad quicker through the gears than the L28 in my Z.
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    Registered User stevegee's Avatar
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    Default 810 model comments

    Over here in Australia we had 240Z 240C and 240K. Maybe the 810 was that type of body. As for EFI L24's unknown if any are here. STeve do you happen to know what to look for on the block casting? I will try to get a part number.. The oil cooler pick up and return ports seem to be tapped into the metal block just above the head gasket and to the left of that offset Oil filter you mention.. Casting mark on block below exhaust ports N42 followed by number 23228.

    Casting on a spare L28 engine I have a mark 1 also with offset oil filter is N42 followed by 9601D also an N42 head.

    My zedman has 8X23A casting after the N42 so these are casting serial numbers.

    Yes I think the L24 might rev more be short on torque but will turn in good miles per gallon especially on LP Gas.
    Last edited by stevegee; 12-02-2003 at 09:40 PM.
    Steve Gee

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    Registered User stevegee's Avatar
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    Default Eureka I have it got..

    ENGINE
    CASTING CODE
    L24 ('70-73 240Z)
    #P30 (flattop pistons)

    L26 ('74 260Z)
    #P30 (flattop pistons)

    L28 ('75-80 280Z)
    #N42 (dished pistons)

    L28 ('81-83 280ZX)
    #F54(flattop/dished pistons, siamesed cylinders)

    SO by having an L24 with flat top pistons and an n42 head I have higher compression.
    AN engine chart is available at... http://www.zclub.org.nz/links.htm

    the calculator allows you to play what if I changed this...
    see ya.. thanks
    Last edited by stevegee; 12-02-2003 at 09:42 PM.
    Steve Gee

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    Registered User bula_rav69's Avatar
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    Hi, just a thought but maybe this engine was built with high compression to take advantage of the LPG? This is a common this to do if it is LPG only but with dual fuel it can cause some problems. here is a link to datsun nut who built up a skyline with a 2.4L Turbo running on LPG you may find it of some interist??
    http://www.picknowl.com.au/homepages/wardr/Default.htm

  8. #8
    I got 280zx Fever 280zx Fever's Avatar
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    steevegee - the block casting is under #6 cyl to my knowlege

    2.4 EFI came from early Skylines

    Maybe you got a 2.4 EFI from a skyline.. They might just use the 280zx top end ....


    While your head ride height for 280zx's from fender lip to centre or the hub. ? mine reads 14.5 Inchs on the backs and 15 on the front. and 14.5 all around on the new 280zx.
    1979 280zx Fairlady Z
    HGS130-000713
    L28-306538

    1981 280zx
    HGS130-193087
    KHGS130MBC

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    Registered User stevegee's Avatar
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    Default SKyline etc

    OK on 2.4 E, I wonder if that explains the oil cooler outlet. Maybe GT?? Ride height for Zedman front and rear is exactly 14.00 inches give or take a tenth front and rear. Tyres are 225x50 or 55 series x 16. MArk 2 uses 225x65x14 Eagles, no engine so cant tell ride height but my MArk 2 I just sold had same "stance" enclosed pic..
    Steve Gee

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    Registered User stevegee's Avatar
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    Default

    Mar 2 280ZX 2+2
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    Steve Gee

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    Registered User stevegee's Avatar
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    Default Simmons on ZED

    Closest pic of Simmons on ZEDMAN I understand these wheels were a special order with the correct tower to tyre offset of 22mm. These wheels dont quite fit a Mark 2 strut for some reason they just touch the springs, did Mark 2's have wider spring sets in the front maybe??
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Steve Gee

  12. #12
    Registered User stevegee's Avatar
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    Default Skyline E24

    Nope its not a skyline engine, at least not the late model, I checked one in the wreckers today and it has L24 prefix, E30 head and a apin on oil filter. Ours has elbow shped filter and that damn oil line for a cooler. Must be after market import froma skyline GT. only answer.

    The injector top set looks like 280zx so E24 injectors would be interchangeable as would the neat set of metal header pipes on the skyline, why didnt 280s have neat exhasust systems instead of the cast srap??
    Steve Gee

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    I got 280zx Fever 280zx Fever's Avatar
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    Mark 1 is ? 1979 -1981 ?

    Mark 2 is ? 1982 - 1983 ?

    The only Z's ive owned have been 2 x 79's and 1 80.

    And there is no change in springs there...

    Tyres on my Z's are 205/60/14's and 245/65/14's
    1979 280zx Fairlady Z
    HGS130-000713
    L28-306538

    1981 280zx
    HGS130-193087
    KHGS130MBC

  14. #14
    I got 280zx Fever 280zx Fever's Avatar
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    Also ill add.. the 1980 has a differnt oil filter too it...well not differnt just where it goes to the block.
    1979 280zx Fairlady Z
    HGS130-000713
    L28-306538

    1981 280zx
    HGS130-193087
    KHGS130MBC

  15. #15
    Registered User Ben's Avatar
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    The offset oil filter mount can be retro fitted to any engine. The N42 head is definately L28E. It sounds like you have an L24E with an L28E head fitted. No big deal, possibly done when someone cooked the L24 head :/
    Are there any thermal tell-tales stuck to any of the heads welsch plugs?

    FWIW Rob Ward is a close friend of mine, his LPG 2.7L R30 Turbo is producing 170kW at the wheels - with a leaking head gasket & NO ignition control (locked dizzy). This summer we're going to fit a Haltech E6A to it for ignition purposes only & try to produce the same power at lower boost & get more economy out of the powerplant. He's also got an external gate & bigger turbo to fit. The current wastegate is permanently open & it will still boost to 20psi....

    Here's a photo of the car that I took at last years SESM show at Mt. Gambier: http://www.versadev.com/ben/sesm%202002/DSC00639.JPG
    Last edited by Ben; 12-06-2003 at 12:40 AM.
    Ben
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    South Australia.
    IZCC#1902
    HS30-103353
    1973 240Z (L28ET)
    WGNC34-008753
    1996 Stagea RS-Four V (RB25DET)
    DR30-035184
    1983 DR30 Skyline RS-X Turbo (FJ20ET)

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    Registered User sjcurtis's Avatar
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    Default R30 Series Skyline Engine

    stevegee,
    sounds like you have the basic L24E Aussie Skyline engine sold in Aus from 80/81-85 when ADR polution control took them out of Skylines. I am agreeing with Ben on the head, sounds like someone either cooked the original or was after a big valve upgrade to the L24E it should have an E88 late series injection small valve head (standard) with a cam profile (248/248).

    For interest sake what is the serial number of the L24 block, 240Z blocks finish at about L24-188200. I expect a number a lot higher in sequence. The L24E should of had a " Middle Sump"( normal Z possy is Rear Sump), that was probably changed out when it was installed in the 280ZX.

    What you have is an engine combo that will definately please if you drive the rev range and keep it on power. the L24E breathing well does hummmmm.
    My2c
    Steve

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    Registered User stevegee's Avatar
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    Default $24 question

    L24E's are fitted to Skylines, oil brackets are interchangebale. No one yet has told me what model had an oil cooler. I checked a Skyline in a wreckers, NO OIL COOLER OUTLETS on that L24E and the 240Z had no oil cooler outlets, so Q is did the Skyline GT have an oil cooler outlet? Anyone got a manual on the L24E engine possibly can assist??
    Steve Gee

  18. #18
    Registered User sjcurtis's Avatar
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    Default R30 Skyline GTX

    The GTX hard top with L28s has a water cooled oil cooler and offset filter attachment it came in either hard top or sedan in manual only with an R200 diff. and as far as I am aware is not listed for L24E,(looks like another retro Fitt).
    Cheers
    Steve

  19. #19
    Registered User Ben's Avatar
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    The only other R30 powerplant that had an oil cooler was the FJ20E. Can you post a shot of the cooler attachments? That way we can see if it's OEM or aftermarket.
    Last edited by Ben; 12-06-2003 at 06:00 PM.
    Ben
    Adelaide,
    South Australia.
    IZCC#1902
    HS30-103353
    1973 240Z (L28ET)
    WGNC34-008753
    1996 Stagea RS-Four V (RB25DET)
    DR30-035184
    1983 DR30 Skyline RS-X Turbo (FJ20ET)

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