An idea I might try and look into?

[b-28L280zx]

well since the L28 just sucks because it has a single head with small valves? Anyone ever convert it to a duel head (4 valves a cyl) ??? think that would do much? I think thats the only weakness the L28 has well major over the newer engines.

[MikeMan]

That would most likely be tremendously hard. Unless a dohc head was made for the L28 (unlikely), then you're going to need a custom head. That is to say, you must design and manufacture the head yourself. Considering heads are made to very specific measurements and materials, this would be prohibitively expensive and hard.
The only real chance you have (if you do want to keep that L28 block) is to try and find some I6 head (perhaps from another manufacturer) that would have the same bore and cylinder spacing, and even then its a long shot that it would work.

-Mike

[b-28L280zx]

Originally Posted by MikeMan

That would most likely be tremendously hard. Unless a dohc head was made for the L28 (unlikely), then you're going to need a custom head. That is to say, you must design and manufacture the head yourself. Considering heads are made to very specific measurements and materials, this would be prohibitively expensive and hard.
The only real chance you have (if you do want to keep that L28 block) is to try and find some I6 head (perhaps from another manufacturer) that would have the same bore and cylinder spacing, and even then its a long shot that it would work.

-Mike

BMW has a Inline 6 thats the same size as the L series and even has the same 2800cc i might check with the specs on that. and i think nissan had a 2.8 inline 6 deiseal for awhile to that might work to.

[Wolfwood]

I posted a thread a long time ago where this topic was brought up, Moppie had this interesting information to contribute, maybe it will help you:

The L series is IMO a great engine. It was orginaly a Mercedes engine, but Nissan purchased the rights to build it under licence. It will actualy bolt directly into a similar year merc with the same engine in it, and there are a few mercs running around with Nissan engines in them. If your interested in doing a simple swap, then a Twin Cam from a merc will bolt right in, and will even let you use the mechanical fuel injection. They have a fair bit more power and torque, altough finding a good one thats a good price will be difficult.

[k3smostwanted]

Originally Posted by Wolfwood

I posted a thread a long time ago where this topic was brought up, Moppie had this interesting information to contribute, maybe it will help you:

The L series is IMO a great engine. It was orginaly a Mercedes engine, but Nissan purchased the rights to build it under licence. It will actualy bolt directly into a similar year merc with the same engine in it, and there are a few mercs running around with Nissan engines in them. If your interested in doing a simple swap, then a Twin Cam from a merc will bolt right in, and will even let you use the mechanical fuel injection. They have a fair bit more power and torque, altough finding a good one thats a good price will be difficult.

good info...im sure someone will eventually further researcht that idea and put it into effect.

[b-28L280zx]

hmm ima look into this i knew it was a BMW or Merc engine that was just like the L series since all the L series engines are trhe same size but different cc's every module year. Thanks for letting me know about this

[Wolfwood]

Your welcome, I hope you can find some leads on that dohc L series. I searched for it quite a bit myself, but i was never able to turn anything up. If you find any info on it please post, i was interested in it for my 280z too.

[b-28L280zx]

Will do man i am very good info seeker i will look long and hard.

Edit: found this just now

Incidentally it is related to a Mercedes engine. The Datsun 1600 engine is a copy of the early 1960's Mercedes 220 six cylinder engine, minus two cylinders and suitably stroked and bored. Then to make the 240Z engine (L24) Nissan added 2 more cylinders. The L26 engine from the 260Z is the L24 with the same bore but a bigger stroke. The L26 became the L28 of the 280ZX.

The L series engine was last used in the six cylinder Nissan skyline (mid 80's) and the VL commodore but this time with a capacity of 3.0 liters.

Straight six engines are notable for their smoothness and are theoretically the closest you can approach the smoothness of a V12. However they are not the best in terms of packaging and so have been mostly.

The L series engine is well known for its legendary strength and reliability. The engine is a seven bearing design and has an absolutely bulletproof lower end. Legends abound of cars with 500,000 miles on the clock which come in for an overhaul and the lower end is still OK. L series engines very rarely need an align bore of the lower end no matter what the mileage.

[SR240Z]

here is a link to one of the hybridz guys doing a 24valve head for an L series http://forums.hybridz.org/showthread...light=dohc+l28

[MikeMan]

Originally Posted by b-28L280zx

The L series engine was last used in the six cylinder Nissan skyline (mid 80's) and the VL commodore but this time with a capacity of 3.0 liters.

Incorrect. I don't know where they got their information from, but the VL commodore uses the RB30E, with the VL Calais Turbo using the RB30ET. The R30 may or may not use the L series engine (I'm not too sure on that) but the R31 and the VL Commodore both used RB30E(T)s

Straight six engines are notable for their smoothness and are theoretically the closest you can approach the smoothness of a V12. However they are not the best in terms of packaging and so have been mostly.

Any 60 degree V6 or a 90 degree V8 both have all their cylinders fire with a set period in between (as in, 120deg between V6 cylinders firing, and 90deg between V8 cylinders firing).
So I'm not quite sure as to what their definition of 'smoothness' is, but I'm not aware of any technical reason that makes the I6 superior in smoothness to either a 60deg V6 or a 90deg V8.

-Mike

[b-28L280zx]

Zgringo what the hell do you have againts the OLD I6's man you sound like your pissed as hell when you discrib em and half the stuff you say isnt even correct its accurate but you totaly beat the shit outa the I6 lol

Edit: and its not your last one im talking about im talking all of them you mention the L series you totaly sound like you want them all to burn in hell ahhahaha. But okay there outdated and old jeeze man dont kill me for liking the L28 because its the only engine i can understand today.

[MikeMan]

stephenp!?!?
Is that you!?

[b-28L280zx]

no but tell your 300zx i told its V6 to burn in hell mahahahhahaha

And by the way i think the VL commodore might of had different engine options in japan. im not really sure though.

[b-28L280zx]

Oh come on i never said that i got it off a datsun site let me look it up
http://www.elfland.net/About/z/zhistory.html see look i never said that lol STILL MY I6 is kicking at 230k miles only 10 psi lost since then its running 140 across amazing? never had a rebuild, never had enternail problems, never had its clutch replaced (probally why its lasted so long) danm the lady never like drove it hard the syncronyzers between 1st and 2nd are almost gone :0 but the other ones are perfect

[Yaggus]

Originally Posted by b-28L280zx

And by the way i think the VL commodore might of had different engine options in japan. im not really sure though.

Commodores are an Australian car. Not Japanese. they had the RB30 in them.

Both Mikeman and i are Australian. I think we should know.