56 minutes ago, 240260280 said:

44mm is a big carb for a 2litre engine.

I have 45DCOE-9s on both my S20s.

Driveability is fine. Even with 8L cams, S20 is a pussycat.

You can make them work but 40mm is better. I have 55's but no motor for them.

Edited December 24, 20195 yr by 240260280

1 hour ago, 240260280 said:

You can make them work but 40mm is better.

So, you know how long the piece of string is then...?

 

Merry Christmas ! 
 

I will stay “ stock “ on my Z432 , make a racing engine using the spare engine.

Blue , I like 40’s too !

Kats

Hi Kats,

Merry Christmas!  As Alan mentions, you can make nearly any size DCOE carb work with any engine due to their adjustable sub-componets, however; Weber does give recommendations for racing and street use. These are plotted below.

 

In parallel, many engine tuners over the past decades have published recommended configurations for the street. They generally recommend 40mm and 42mm for street for 2.4 to 2.6 litre engines.... so for a two litre, 40mm would lean more to the higher side.

According to the great DCOE tuner John Passini, he mentions in several publications that the transition from a small choke to a larger carb throat causes fuel to precipitate to the carb floor.  For example going from 32mm choke to a 40mm carb throat has less fuel precipitation than going from 32mm throat to 45mm carb throat.

Weber recommends that the ideal choke size for racing is ~ 80% of the diameter of the carb throat. So for a 45mm carb, a 36mm choke would be best.  This is a very large choke for street driving and give poor low rpm performance.

 

A lot of great data is at this site that Hoover and I love.. they use 82% ratio for Solex:  http://www.carry-back.com/CARRY BACK Carbu setting 2.htm

 

 

 

 

 

 

 

 

Edited December 25, 20195 yr by 240260280

Hi Blue , 

my 44mm has 34 choke , it is just right for the carb , racing use .

I believe U20 race option was 50mm , one cylinder is approximately 500 cc , so it is suitable, isn’t it ?

Kats

Hi I found old pictures , those were in 2009 . Not clean like those pictures anymore today.  But I have been enjoying so much , no-regret for what I have been doing to my cars.

Kats

Today 

Kats

I visited a classic car shop yesterday , there is a Dec 1969 PS30-00062 . I felt this car is a good original car , a lot of original parts . 
 

I immediately noticed the welding finishing touch of the radiator support upper L & R corner , this is what I call and love  “ hand crafted “ which is rarely seen in our mass produced S30 . 
 

How many things can we list “ hand crafted “ treatment parts in our cars ? I would say the interior roof center trim piece for room lamp could be the one , my 03/1970 has two cut away for the defroster wires which would looked “ hand crafted “ cut away . 

I guess my blue trim was made in early days and not ready to be considered as a car which have a defroster glass . Nissan would just make them a little too many blue trims .

My blue tail gate interior trim too , the pieces for the vent system is different from later vented one , those pieces can only be seen on an early trim in black . Blue and Tan could be interesting as parts to be used early parts into a bit later cars .
 

How about yours ?

Kats

Edited January 19, 20205 yr by kats

2 hours ago, kats said:

Hi I found old pictures , those were in 2009 . Not clean like those pictures anymore today.  But I have been enjoying so much , no-regret for what I have been doing to my cars.

I wish there was a way to preserve the look of freshly yellow cadmium plated parts. But I wouldn't regret using your cars either.

1 hour ago, kats said:

I immediately noticed the welding finishing touch of the radiator support upper L & R corner , this is what I call and love  “ hand crafted “ which is rarely seen in our mass produced S30 . 

I noticed these on HS30 00150 too! I thought it meant the car had been repaired before. So this is good to see and know about as being "normal".

The car has been in a nudge on the passenger side, but not enough to disturb the radiator support. The driver side is still as OEM as new.

Edited January 19, 20205 yr by Gav240z

Hi , I did some work recently. Checking the inside of the passing light switch of my Z432 and 240ZG , they both keeps good condition.

And I did an amateur job for the seat reclining mechanism cover which belongs to my elder Captain Shigekura, they were so badly missing tabs . Don’t look closely, I regret I didn’t took much more time for perfection, but Mr. Shigekura said it is OK about the results.

His 240ZG has been kept clean , original condition. He just replaced the seat upholstery and carpet which were done by the master , Mr. Sudo . With using  the original materials  Mr. Sudo customized them to give a little more stiffness ordered by Mr. Shigekura. 

Kats

Hi , I let my treasure go to the other Fairlady 240ZG , it is an optional item which was available for the L-series engined car in Japan . 
The dual exhaust system for the L-series engine is one of the rarest part to obtain nowadays. Maybe back in the old days too , most of people even don’t know what it is .

The front and center tubes “ 20010-E8730 “ is the one , this was made specifically for the L-series standard exhaust manifold to bolt on . I imagine so few people chose this set up when people going to have sporty “ dual exhaust systems “ back in 70’s and 80’s . I think this is not so sportier than the one with the full race exhaust manifold set up .
 

Usually, people have Nissan sports option replica exhaust manifold with the Z432 genuine center and tail pipes or , after market  set up for their cars .

Please see the pictures, they are all genuine Nissan exhaust systems. The ones the left is designed for the L-series standard exhaust manifold, the ones on the right is for the L-series engine with the genuine Nissan race option exhaust manifold with genuine Z432 center and tail pipes set up . 

Everybody who has S30 series car can attach this “ 20010-E8730” on his car .

Kats

 

Edited February 22, 20205 yr by kats