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PostPosted: Wed Jun 01, 2005 6:57 pm 
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Joined: Sun Jul 25, 2004 10:28 am
Posts: 56
Hey
I have currently got blown piston rings in my z18et and i have a reconditioned L20b, so my question is........how easy is it to replace the z18 block with the l20b block, is it a straight swap, or are there issues with the height of the L20b block(being taller then the other L-4 series)
and what would be a safe level of boost to run???
any help would be great

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 Post subject: head swap
PostPosted: Wed Jun 01, 2005 7:38 pm 
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Joined: Thu Jan 06, 2005 5:48 pm
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Location: melb
ive just done the same thing l20 bottom z18 head, u just have to use a z20 timing cover, z20 timing chain and guides.


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PostPosted: Wed Jun 01, 2005 9:42 pm 
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would z22 cover and chain do the job????

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PostPosted: Wed Jun 01, 2005 10:27 pm 
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Joined: Mon Apr 12, 2004 10:44 pm
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Location: On a XR650r, VIC
Ok,
Im in the same boat as Kiwi510 but have a reco'd L18 sitting here.
Can i just use the Z18's timing cover and thats it?? :?

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 Post subject:
PostPosted: Thu Jun 02, 2005 4:12 am 
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Joined: Sat Nov 06, 2004 8:17 pm
Posts: 916
Location: Western Australia
yeah a z18et head on a l20 block is quite simple. Just use a z20 chain, guides and cover or use a z22 chain guides and cover
z22 and l20b blocks are the same size.

i am building a grunter l2.1et at the moment. Just had everthing machined and it's all going back together.
there will be a big write up about it soon in the members rides section

some things i got are rb25 forged pistons, bathurst bluebird camshaft, hks 2540 turbo.

any questions feel free

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 Post subject:
PostPosted: Thu Jun 02, 2005 9:50 am 
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ok so with my l20b block, z22 cover/chain conversion, what sort of boost can i run???
do the L series stand up to 10psi+???

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Datto 510, z18et, water/air cooler and white wallz


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 Post subject:
PostPosted: Thu Jun 02, 2005 1:47 pm 
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Green510 wrote:
Ok,
Im in the same boat as Kiwi510 but have a reco'd L18 sitting here.
Can i just use the Z18's timing cover and thats it?? :?

From what i gather the z18 cover and chain should be fine with the L18, the reason for different chain and cover on a l20b is cos the l20b is a taller block.

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Datto 510, z18et, water/air cooler and white wallz


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 Post subject:
PostPosted: Thu Jun 02, 2005 10:22 pm 
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Location: Western Australia
i recon with a rebuild you could run up to about 15 psi. Some people run more than that but it starts getting sketchy with the cast pistons.
It should run all day on 10psi.

yeah z18et head should bolt straight up to a l18 but the thing to watch is the breather on the exhaust side of the block. Might fould on the turbo if the original manifold is used. z18et blocks have the breather coming out differently

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 Post subject:
PostPosted: Tue Jun 07, 2005 10:30 pm 
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Joined: Wed Dec 24, 2003 3:00 pm
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Location: Darwin. Home of the Rice Car ShitHeap Lancer/Excel and really gay numberplates.
how do you get the rb25 pistons to fit l series rods? was it/is it hard or expensive?

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 Post subject:
PostPosted: Wed Jun 08, 2005 7:34 pm 
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Location: Western Australia
rb20/25/26 pistons all have a 21mm pin diameter which is exactly the same as the l series.
All the aftermarket pistons for these engines are full floating pins- so all you have to do is hone the inside of the l series rod to a size that provides nice rotation(have the specs somewhere).
you also have to add some oiling holes to the top of the rod. The best place is two holes 45degrees to the centerline of the rod.

do you research and check the compression ratio closely as these pistons have a very low pin to deck height (31-32mm). my engine is running a 7.35:1 comp ratio-too low for a street engine.

might be a good combination to mill the dome off the top of the forged piston and run long rods???

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 Post subject:
PostPosted: Sat Jun 11, 2005 10:09 am 
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Joined: Fri Oct 08, 2004 1:31 pm
Posts: 79
I have an L18, so would I benefit from bolting on a z18 head over a normal l series head?

If so could I run my twin 45's on that head?


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 Post subject:
PostPosted: Sat Jun 11, 2005 12:10 pm 
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kkk289 wrote:
If so could I run my twin 45's on that head?
No. Z18 is a completely different head. As its crossflow, the webbers will end up on the other side of the motor. Has different port arrangement as well, so you L-series manifold won't fit, and I can't imagine Z-series webber manifolds would be thick on the ground.

I've been researching this a bit recently, for a different reason, and the general opinion was that the L-series heads were a better performance head. See the first page or so of this thread

http://ozdat.com/forum/viewtopic.php?t=4920&start=0

The only majr benefit to a Z18 is that it is a factory efi / turbo engine. The Z-series heads were actually designed as an anti-pollution head rather than a performance head.

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 Post subject:
PostPosted: Sun Jun 19, 2005 9:17 pm 
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Joined: Sat Jan 29, 2005 10:18 pm
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Location: Bundaberg
Dave wrote:
The Z-series heads were actually designed as an anti-pollution head rather than a performance head.
Hence the twin plug arrangment?

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PostPosted: Sun Jun 19, 2005 10:44 pm 
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I believe so. I have read somewhere that the two plugs are set to fire at slightly different times, to reduce emissions, although i stand to be corrected about this.

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1970 ex Group A Rally P510
1971 P510
1972 180B SSS
1965 SP310 Fairlady
1966 SP311 Fairlady


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 Post subject:
PostPosted: Sat Jul 16, 2005 12:31 pm 
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Joined: Wed Dec 24, 2003 3:00 pm
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Location: Darwin. Home of the Rice Car ShitHeap Lancer/Excel and really gay numberplates.
my z head was ony a four plugger. MUCH easier.

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Aaron


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