RB20E heads on L series blocks

[Riceburner]

I posted this on the you tube section. I found it all quiet interesting

 

Cross flow L series  From what I can see they use RB20E heads

 

 

 

Here's a blog for the car in the second video, some crazy goodness! I just used google translate to get a tiny bit of info in english.

 

http://sato1511.blog40.fc2.com/category47-2.html

 

From what I saw they had machining/casting facilities. They machined a plate for the rear of the head and fitted two oil return lines to the sump. A single Oil supply looked to be tapped into the block and two lines were run to the centre of the head. They used LZ chain guides, L series tensioner and a LZ chain with four links removed.

 

Agno asked a very good question as to why they'd use a single cam head and not twin cam, anyone have any clues about the rb20e heads.... Do they flow much better? Has this been done before? They seemed to be trying to make a modern LY engine that still appeared very similar to the originals.

 

[zzzzed]

Also why not use the rb25e head or the rb30e for that matter. An why not just put the whole rb motor in?

[Riceburner]

Is the RB20E less work to fit compared to the other heads?

[d3c0y]

Using the RB20e head you are sort of making an LY.

You have to wonder if its like the Z (ie Z18 - Z24) heads though which were apparently not great for racing applications because you cant fit big valves in them.

Had a look and cant find any info on valve sizes for stock or the one in the link.

[Riceburner]

I did manage to find something yesterday on the valve sizes, apparently these guys were able to use bigger valves than what L series is limited too.

 

Seems your correct it's all about the original 'LY' look

 

http://www14.ocn.ne.jp/~mm-days/crossflow/crossflow.htm

[pauly_adams]

http://www14.ocn.ne.jp/~mm-days/index.htm

 

link fixed

 

[d3c0y]

It looks like it's running the following specs:

 

-LD28 Crank

-KA24 flat pistons

-46mm inlet 38mm exhaust

-.520" lift cam 76 Tomei

 

All pretty standard stuff to do to an L.

 

This head is cam belt driven from the factory and there has been a ton of work put into it to make it work. It would be interesting to see if it could run a cam with around .600" lift because it looks like the head has been clearanced pretty extensively already.

 

Maybe that setup with the lifters is better for high RPM running? Sounds a lot smoother with the different valve train when it's running

 

It's running 55 Webers with 53mm venturies which is pretty overkill for what i think that motor will make HP wise.

 

It's definitely a cool motor would love to find a hp figure for it. 300-320hp maybe?

 

It's also got acrylic 1/4 windows which is cool.

 

 

[NZeder]

I posted about this build about 12+ months ago...will have to find the link again but I am sure it is on this site

 

Update: here is the old thread

 

http://www.viczcar.com/forum/index.php?topic=8760.0

[benny]

here is one i have in my stash-

 

 

http://www.ssfalcon.com/lytwinturbo.htm

 

 

 

 

[Agno]

They wouldn't have used RB30E heads because that motor doesn't exist in Japan, neither does an RB25 single cam. I figured they went for the single cam head for the period correct LY look. I wonder how much more flow they would get from using an RB30E head with big ass valves

[Riceburner]

I posted about this build about 12+ months ago...will have to find the link again but I am sure it is on this site

 

Update: here is the old thread

 

http://www.viczcar.com/forum/index.php?topic=8760.0

 

Whoops my bad! The attention to detail is amazing, sounds pretty meant too.

[stevofoxono]

Thought this would interest anyone looking into head swaps

 

http://forums.hybridz.org/index.php/topic/79780-mag58s-dohc-l28-build-log/

 

I'd love to know how this turned out *spoiler alert* no updates since 2010  ...

[peter mc]

hears one for you

[pauly_adams]

u tease

[luvemfast]

hears one for you

When are you getting back on the NC Peter?

[peter mc]

building a crank for it now Simon . 3.4 tc

[NZeder]

building a crank for it now Simon . 3.4 tc

race gas only or pump gas?

[peter mc]

race fuel 13.1 comp and 9000rpm

[NZeder]

Nice and with the cc to go with it as we know you can get enough flow from an L6 head with work/mods so the RB26 heads have more than enough for under 2800cc in NA form so all that extra cc will help alot

[peter mc]

The reason you need to go big in engine size  is because the Rb26 head is 63cc in the chamber and that means the comp would be so low , the head i have has been welded up by Les. so i have made it 53cc and with the 89mm stroke and 90 bore its a bit easyer to get the comp up with out having a silly bump in the piston

[Ledge]

Hey guys

I am actually in discusions with Sato at the moment for the gear to run the RB30 head on my resto.

 

Would any one else be keen.

 

Cheers

Paul

 

[d3c0y]

Hope you plan on running a turbo on it...

[Agno]

Hey guys

I am actually in discusions with Sato at the moment for the gear to run the RB30 head on my resto.

 

Would any one else be keen.

 

Cheers

Paul

 

 

Why must I be a poor uni student!

[Riceburner]

What sort of money are they asking?

[luvemfast]

Why must I be a poor uni student!

Cos you deserve it! 

Oh, and one day........ You'll have money.

But by then, most likely a lady who'll take it all