l28 engine query

[audiman]

right my l28 carb i think is not running right and it may need a tune up it may be that the carb is shot wont know untill i get chance to have a look at it

anyway i got to thinking would a throttle body off say a zx240 or a 280 bolt straight as my thinking is it may make throttle responce/ engine running more smooth and reliable

or is there another throttle body or a differnt carb i could go for

i am hiting a majot flat spot / almost a misfire at around 2000rpm in most gears and accelerating make's it worse if i ease off the throtlle then gently acerlate then it runs a bit better


so at this point just looking at options cheers

Lee:biggrin:

[kiwijase]

the engines in the 280z/fairlady are the same,except the patrol head breaths better (n42)
A throttle body is for injected engines,i thought patrols were carbed,so you would have to swap the head(no injector holes on patrol head)
Look at vacuum advance first in bottom of the dizzy,sometimes the baseplate loses the ball bearing under it.
You cant use carbs off a 240z or 260z as they are SU's,you could try though,but from memory they have different mounting patterns on the manifold

[taslucas]

May be as simple as a blocked carby. Ive read that they have a screen filter inside the carby that may need cleaning

Heres a few threads that may help:

http://www.nissanpatrol.com.au/forums/showthread.php?11853-thoughts-on-a-mk-2.8-petrol

http://www.nissanpatrol.com.au/forums/archive/index.php/t-14558.html

[Robo]

Yes the old 24/26z stuff was mech fuel injection from memory.
so more trouble than it worth proberly.

You can get twin SU carby set up, but very rare these days I'd imagine.
Setup Su's was very touchy on the throttle.
basically 1/3 throttle was full throttle, as cam and air flow maxed out I guess.
more throttle had no more power out put.
engine ran this way for a several yrs , and it didn't hurt engine so guess tune was ok.
belong to outlaw and bro-inlaw so I knew the car well. I drove it often.

Have seen a 2nd hand turbo set up for l28 on www.rhdjapan.com.
but again this would be very rare item and hard to find these days.

sorry to say I had it's original complete manifold and carb in shed for yrs and threw out last yr.

[audiman]

well now got the new front pipe fitted after a lot of agro yesterday took it to a exhaust centre and it was orginal front pipe never been off and the put wrench on to remove nuts off studs and snap all 3 broke even though they heated it up anyway after stripping a stud extractor and them putting a new set of jaws in they got the job done although it took all day was off work so was a long day spending most of it there bill came in at double the quote but it now sounds a lot quieter and does drive better than before.
airfilter is not brill so think plugs and filter are the next things to try it gets upto 30ish and will miss then it clears when you get to 40ish but comes back again at around 50 again it clears when you get past 55ish so carb cleaning is also on list of work to be done.
Thanks for the infor on throttle bodies dont think it worth going down that route and never even considered a turbo not really looking for that much power gain more just to improve the throllte responce which does go back to carb cleaning and plugs etc
cheers

Lee

[Robo]

Performance stuff for L28 ex, RHD site in Japan.
even had full counter weight crank kit.
Admittedly near 10k, but hay the stuff is still around.
pic is stroker, rod and piston only kit $2651
Track car stuff I presume for L28 engine.
the L28 is a reliable old beast.
some eye candy for ya

[audiman]

umm thats 6 into 1 looks nice but not going to happen on my budget

anyway in one of the earlier replies someone mentioned about the ball bearing on dizzy base plate can someone make that a bit clearer for me i don't understand what they mean?

secondly cant make my mind up if its missing or hesitating you get to around 30 in second and change up to 3rd and then that when its plays up has no power and pretty much have to back off throttle and then accerlate again and its fine does the same thing around 45ish to 50ish in 4th to 5thgear change
plugs and airfilter are next on hit list and i think a set of points may help too

cheers

Lee

[Robo]

Actually 6 into 2 stainless performance pipes.
The old Girl would breath better then, lol.
yeah bit hard to justify 2.5k for that.

It really sounds like you should rebuild your carby.
the bearing plate is the advance assembly inside the dissy.
that can be problematic not moving smoothly as it should and needing good clean up and lube
the bearings can also make their own little notches in the plates.
and jamb a bit as a result this to can cause the hesitation you describe.
pertronic ign is a vast improvement on the points and worth the exercise also.

[audiman]

Thanks Robo that makes a lot of sense pertronic ign i take is electronic ignition is it a bolt onto to the existing dizzy or a new dizzy fitment

and if its a bolt on is it something i can source locally in the uk or a import job from Aus? might be a worthwhile conversion if its not too expensive

oredered plugs airfilter and points today as these are easily attainable in the uk

cheers

Lee

[taslucas]

Do a search for pertronix electronic ignition in this forum, there's a few good threads. I got mine direct from USA. They post worldwide and definitely worth fitting one:-)

Tap, crackle, pop

[Robo]

Yes pertronic unit replaces the points.
long story short, electronic sensor that basically detects a cam lobe.

The advance plate will still need to function correctly even with this upgrade.
But no more stuffing around with points.

The ignitor is what your after to suit your vehicle.

Home page US exporter.
http://www.vintageperformance.com/retrorockets/
ignitor page.
http://www.vintageperformance.com/retrorockets/Datsun/nissan.htm
cheers

[taslucas]

I got my Pertronix Ignitor2 and flamethrower2 coil from this guy:

http://www.ponderosamustang.com/

[audiman]

think the ignitor kit will have to wait a bit the cost of importing into uk is coming in quite high so will have to save for it

anyway plugs and airfilter will go in as soon as ther arrive everything i have done so far is making the truck more roadworthy and better to drive

carb cleaning will be next on the agenda

cheers

lee

[taslucas]

Goodluck with with it Lee. Keep us posted:)

[kiwijase]

theres so many things you can do to the good old L28e.
Biff l24 or l20e jdm rods,ka24 pistons(from memory) and a ld28 crank and youre good for a 3.1ltr screaming 6
The 240 and 260z wernt injected,they were rount top su.The JDM GS31 (same as 260z R/S30) came with the injection option but was only a L20e,same bosch system as the later 280z/zx/fairlady z (HGS130)

[Robo]

I got my Pertronix Ignitor2 and flamethrower2 coil from this guy:

http://www.ponderosamustang.com/

Think this guy sells on ebay

[audiman]

right latest update too it up the local dual carriageway been stood for 3/4 days to seeif heater was working answer no its dead andyway truck would not go over 30mph and was backfiring got back home and removed stat which was rusted in new stat needed but now it wont start at all will fire but no spark so am i right in thinking that the points are playing up

cheers

Lee

[audiman]

right new points fitted and it still ran rough took it to my mates garage and timing was well out dizzy was retarded a lot now runs a lot better no backfiring or coughing

does hit a flat spot around 30 which i can drive though but now thinking that carb may be next to clean up

new plugs also fitted but rotor arm did not look to good so a new one is on shopping list can only improve spark

did someone say that the gq carb may fit which may be an option if i can get my hands on one cheap enough in the uk

cheers

Lee

[Robo]

I don't think that would work to well.
L 2.8 doesn't breath anything like a TB 4.2.
Just re-kit it.
Its a fairly small basic carb and should be straight forward to do.
The cost involved going this way, you would be in-front and money to spare for pertronic upgrade.

[MQ MAD]

The L28s have a fine filter just inside carb, when these block they run like a hairy goat
Check the fuel filter also,if in doubt put a new one in,if not add another,the electric fuel pumps can have issues also
Another thing is the batteries must be fully charged, they dont run well with a half charged battery
I dont know exactly whats been done to my L28 here, stock carb, stock points,yep points,will spin beyond 6,000 on any day
I have the electric dizzy to go in but why i ask myself ???
You can get the factory Z car twin carbs , two different styles but the Z car boys and the demand are forceing the prices up,ive a set here that need rebuilding and ill get $150 ,without cleaners, the factory 2 carb air cleaner will cost well over $50 sometimes 100 just for that
Injection and turbo were also an option on these motors
Mate races an L28 powered Z car,injection is comin off and twin carbs goin back on,makes better power for him
Id check the basics first before rippin it to bits,stuff like,plugs,points,leads,filters all round go new on the lot,get the carb checked for air leaks

2 barrell falcon weber carb are an alternative replacement

[GQ TANK]

Sounds more like fuel stavation - check / replace the filters check and clean the filter just inside the carby

i am hiting a majot flat spot / almost a misfire at around 2000rpm in most gears and accelerating make's it worse if i ease off the throtlle then gently acerlate then it runs a bit better



Im pretty certain a rb30 carby wont fit with out a major mod - inlet manifold.

Twin SU will fit - if you get a inlet manifold as well - They are a bitch to tune - but read about someone in holland running the twin su's - big improvement in power.

Have you had the dissy out ? and put it in 180 out?

Also check the battery volts - mine used to run crap if the alt was sick. The l28 like 13.8 volts - to run great.

I ended up putting a carby rb30 in my old MK - was a lot of work - made a differance to the truck

[Robo]

Sorry for hi jack.
was up the bush yesterday, half an hr outside Dungog.
2.5 hrs N/W of Newcastle doing a training course.
up the farm track middle of nowhere, abanded.
50th edition anniversary MK swb just sitting there going to waste.
makes ya cry