13 hours ago, kats said:

I try not to expect too much , but I think  these parts in front of me are real period correct parts which related to either Nissan Murayama , Oppama , Omori racing factory.

Alan , could you authenticate these parts ? And please tell us more about racing back in those old days. 

 

You got them! Well done!

I think it is most likely that they are indeed genuine Murayama factory works team parts, never intended to be sold to the general public. Original cost of production would have been very high, but not a problem for a works team.

Compression ratio might be a problem for a street car. They are very high intrusion crown pistons and compression ratio would have been very high on the works cars. You will need to work it out with a dummy build.

Alan , thanks for telling me the point , the compression ratio is the matter .

I think the spare head will definitely need to be shaved 0.5 or 1.0 mm , as I don’t want the head to have any things that make it higher compression ratio , I need to think about a thicker  head gasket ? Or enlarged combustion chamber ?

The Z432-R racing manual is saying “ the compression ratio will be 10.1 to 10.3 when using a racing pistons. You will have little more extra power if you make the compression ratio exceeding 11.0 .  However , with regarding fuel , 100 octane currently used , it is safe for the engine keeping the ratio within 11.5 “ 

BTW , STD piston’s ratio is 9.5 with a STD 1.2 mm head gasket.

And , I am worried about the valves may hit the high intrusion crown pistons . 

And I have read about an article which says titanium is expanding when heated , so does the conn rod have to have bigger gap for the bearings as well as bushing on top ? 

Kats

 

On 6/6/2018 at 7:40 AM, 240260280 said:

 

Thanks for the high resolution!  Here is another find.  The inlet on the fuel pump is on the front and outlet is inboard.

Also the exit hose the pump is light colour.

I'll dig some more ?

 

 

@kats@mikeb@26th-Z@HS30-H

 

~aug-sept 1969 had different fuel pump fittings

(source: L24 engine manual)

 

~aug-sept 69 had different fuel rail: send and return connected at dual port banjo rather than in rail.

(source:engine manual)

 

 

 

 

 

Edited April 17, 20195 yr by 240260280

Thanks Blue , nice findings. I might be curious if the car used in the service manual would be HLS30-00013 . A lot earlier car could be used for the manual , couldn’t it be ? 

Kats

19 minutes ago, kats said:

Thanks Blue , nice findings. I might be curious if the car used in the service manual would be HLS30-00013 . A lot earlier car could be used for the manual , couldn’t it be ? 

Kats

I agree. A lot of lead-time needed for the production of the manuals and literature on these cars, and I see a few Skyline, Cedric, Gloria, Laurel and assorted 4-cylinder type parts used on the (likely pre-production/not to be sold) cars and details in the photos. Not surprising.  

I agree,  I think the car in the service manual was HLS30-00001, 2 , 3 or an earlier pre-production chassis. (#4 &#5 were the test cars sent to North America in early Oct 1969)   Photos of HLS30-00013 did not have these unique parts shown in the service manual. It is still fun finding these small changes ?

Thanks Alan , Blue.

Last week I took my blue 240Z for a drive to Tokyo , to have its seats refreshed by the craftsman Mr. Sudo . As I told it here before , the blue seats were restored by him in 2003 . This time I want the seats look just like new again with replacing worn out pieces .  Mr. Sudo is going to replace vinyl pices only where worn out , this is my request . He gave me the extra vinyl when he did the blue seats , but the vinyl is not enough for making a set of whole seats . Also I don’t think they need to be replaced whole thing as they are almost perfect in most of part . 

The seats were finished in later “ slim seat back “ style ,  I have been dreaming about having early “ fat seat back “ style in this blue vinyl. 

This time Mr. Sudo is modifying them to fat seat back style using minimal amount of the vinyl,  I am really excited about it , I can’t wait to see it when he completes the re-upholstery. 

Here are some pictures in progress.

I will be able to show you the seats done in the end of this April.

Kats

You are so lucky Kats! You make us very happy with these posts.....and a little jealous!  Keep it up!

Thanks Blue ! 

Hi , I couldn’t stop myself posting this, 

here is a quiz , what kind of material is this ? And what is it for ? Mr. Sudo has this , it is unbelievable.

Kats

Looks like it could be original maroon Naugahyde. I don't remember maroon seats in a Z.

That looks like authentic hyde of Nauga, distressed texture, on concrete.  It is used for upholstery and not a proper material for a shop floor!