s20 head-l24 block

[datto_240z]

Hiya's

I was wondering if a S20 head would fit onto a L24 block. I dout it but anythings possible. Would it even work? (after putting in S20 cylenders etc. etc.) But ive heard that S20's are as rare as hens teeth in Australia.

Cheers

Chris Beattie

[nixcars]

NO CHANCE!

[Hell_Z]

Are you talking about the Japanese DOHC "S20" engine head?

[stevegee]

This what if allows any combo of heads try it out at http://www.zclub.org.nz/links.htmspreadhseet I have just bought a 280zx with an L24 bottom end, N42 head and 280zx injection so i guess if that fits anything will. Fitting twin cam heads to bottom ends in Totyota at least is really easy, possibly same with Datsun. Wasnt the 710 twin cam???

[HS30-H]

Originally posted by nixcars

NO CHANCE!

As Nixcars says - NO CHANCE!

The S20 block and head are completely different designs to the L-series sixes, and they do NOT interchange.

Here's a pic of an upturned S20 head. I think you can see that - quite apart from all the problems of sorting out oil-pump, distributor and cam drives - it won't even bolt up..............

[stevegee]

Thanks for that, also as with engines twin cam never fitted to the model will need an engineering report to make sure brakes and suspension can handle the BHP increase. In ACT e.g. you need an engineering certificate even if you fit an 800cc F8B engine in place of a 500cc F5A engine, strange but true..

[frank13]

Hi there Alan, would like to know if you have ever heard of a twin cam head ever being bolted to an L -series engine. Maybe some late model head or a head that was not offered in th e states. some time ago (years ago) I heard that there was a head that if you found it or i guess that meant find it and import it, that you could bolt it up to the L-engine. Thanks for any information you could offer. Please email me if you can possibly come up with anything. I know this is a late post to this thread.:devious:

[HS30-H]

Hi Frank,

I think that might be the twin-cam 24-valve crossflow head conversion for the L-series six that was designed and manufactured by a company called "O.S.Giken" in Japan.

It was called the "TC24-B1", and as far as I remember they were first offered for sale to the general public in the late 1970's.

O.S.Giken are still making high-performance components for street and race cars ( they are famous for their clutch and transmission components in particular ) but they ceased making the TC24-B1 long ago. I spoke to them a few years back about the head ( thought they might have some New Old Stock on a dusty shelf somewhere! ), and they said that they did not have any current plans to re-issue them - even in a limited production run. Their casting patterns are not fit to be re-used, and the tooling costs involved in remaking the patterns would be prohibitive..........

It was a very comprehensive conversion, with many special ancillary parts. It even demanded special pistons and rods.

They were pretty expensive when they were current, and they command very high prices when they come up for sale in Japan ( which is not very often ). I have heard many nostalgic stories from Japanese tuners about the heads that they were forced to scrap after big blow-ups. Quite a few of the heads ended up being used with turbo conversions when they first started getting popular amongst the street tuners in Japan. Indeed, I passengered in a twin-turboed TC24 conversion once and it was mighty impressive for the time. I'm not surprised that so few survive.

Here's a pic of one of their original magazine ads:

[HS30-H]

Here's the photograph from the ad - but in colour this time:

[sblake01]

If my memory serves me correctly, I believe they also made a twin cam crossflow head for the L series 4 cylinder engines. Both are long since out of production and virtually impossible to find as well as the ancillary bits and pieces that go along with them.

[Gav240z]

You'd be refering to the LY engine head that was fitted to the Works Rally cars. It was not a twin cam head but a crossflow single cam head.

Not many of those around either anymore. but they do fit the L series.

[stevegee]

As a Twin Cam enthusiast I am aware of a Dastun rallied in Australia in championships called a 710 coupe like a 240B but with twin cam engine and cr 5 speed. They were around the traps here in the late 70's and pretty competitive.

As the owner of the sole remaining 2000GT in Australia I was happy to trounce these guys in events and often got trounced.

When it comes to twin cam technology Toyota and Yamaha had the edge.