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Arghhhh Harada Intake Manifold

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Well I am installing one for a friend on my recommendation but what a piece of $^!#!!!!!!!!!!!!!!!!!!!

 

It does not fit!!!!!!!!!!!!!!!!

 

I've installed several Cannon, TWM, and even a Lynx but this is the first fitment problem.  It looks great and performs well mechanically but come on!!!  The Cannon that it replaced works fine.

It will not fit properly against the header flange AND the stand-off for the rod hits the thermostat housing fittings.

P O S !!!!!!

 

 

 

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I've used, fitted and supplied umpteen Harada Shokai inlet manifolds over a couple of decades or more, and never had any major problems with them.

Any inlet manifold/exhaust manifold interface has usually been the fault of the exhaust manifold flanges being way bigger than they need to be and/or too thick/thin,  and any inlet manifold/thermostat housing interface has been due to either incorrect user assembly of the linkage (getting the return spring clamp round the wrong way/not even understanding how it works) or a slight amount of clearancing being necessary due to the wide variation in thermostat housing shapes/castings.

The linkage parts - especially the linkage arms - are not as good as they used to be (I preferred the old cast items), but I don't see any alternative.

In my experience they are very far from being the "POS" that you claim this one to be. So my money's on the Harada, not you. 

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 Cannon fits, the Harada does not.... it binds in two locations.

The part marked in red is tight against the thermostat housing. I now have to find an early one with no fittings on that face.

 

image.png

 

image.png

 

 

 

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LIke a bolt of lightning from a distant cloud!  Zedyone is here!

 I will go take a few shots of what I did and get back to this thread.  I have been running the Harada for years... I love the fact that it uses the stock linkage. I shall get back to this thread today!!!

 

HUZZAH

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Interestingly enough most of the photos I could find of the Harada installed on an L series are the ones posted on this site.

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10 minutes ago, SteveJ said:

Interestingly enough most of the photos I could find of the Harada installed on an L series are the ones posted on this site.

Have a couple more on me:

 

IMG_1516.JPG

IMG_1518.JPG

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Thanks Alan!

I'll install w/o the thermostat housing then grind off the unused hose fitting on the side of the housing that interferes and weld shut to prevent leaks.

I have ~ 6 spare thermostat housing but none w/o side fittings.  The later 260 and 280z have even more bits on the side.

 

Here is an internet picture of a similar protruding fitting:

240Z Thermostat Housing kit | DATSUN SPIRIT, INC.

 

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Well I just checked my install as I do not recall any interference problems.  I ended up plugging that hole with an allen wrench style fitting and it just clears the manifold by about a millimeter or so.  Here a few pictures to illustrate.

 

DSC_0188.JPG

DSC_0189.JPG

DSC_0190.JPG

DSC_0191.JPG

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Thanks Mike!  Yup you seem to have the side ports plugged. The two that I have are different in that they have fittings on the side ports and they interfere.

 

btw cool arp bolts on the thermostat housing!  First class!

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The only function of that arm on the front is for anchoring one end of the return spring? Seems like they could have put that somewhere else.

Is there a center support tower? If there is, maybe on the rear side of that? Maybe at the back between the rearmost tower and the flange for connecting to the shepherd's hook?

Does that use a custom adjustable length shepherd's hook?

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13 hours ago, 240260280 said:

Thanks Alan!

I'll install w/o the thermostat housing then grind off the unused hose fitting on the side of the housing that interferes and weld shut to prevent leaks.

I have ~ 6 spare thermostat housing but none w/o side fittings.  The later 260 and 280z have even more bits on the side.

 

Here is an internet picture of a similar protruding fitting:

240Z Thermostat Housing kit | DATSUN SPIRIT, INC.

 

I'm stating the obvious here, but - of course - that fitting is usually deleted completely and replaced with a flush plug when converting to triple carbs. That's hardly Harada Shokai's responsibility, and it certainly doesn't make their manifold a "POS". Wind your neck in.

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7 hours ago, Captain Obvious said:

The only function of that arm on the front is for anchoring one end of the return spring? Seems like they could have put that somewhere else.

No, it's a design that was based on the earliest Nissan Sports/Race Option triple carb inlet manifolds for the L-gata, subsequently adopted by the likes of Tomei and Datsun Competition in the USA. It properly accommodates the linkage to the front carburettor - the Sports/Race Option Mikuni 40PHH and 44PHH having their throttle linkages on the LEFT side of the carb body viewed from the carb inlet side - and gives the main linkage rod full support where it is most needed, unlike the 'rod end' type supports which typically hang the front linkage off the end of the main rod.

Harada Shokai also chose to put a fully-adjustable main rod return spring on the end of the main rod, and it is a good solution - used by other manufacturers such as the early Sanyo Shokai manifolds. It works. 

For reference, Nissan Works items:

Works-M-102291.JPG

 

PTE-Eng-06-156.JPG

 

PTE-Eng-06-159.JPG

 

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  1. I had to rotate the spring holder on the rod to just fit between my distributer and my thermostat housing. I took a pic, but I need to post it here.... I will get that up today.  I have been very pleased with my Harada.

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Thanks Alan,

 

That is what I thought. It was designed for very early thermostat housings that have no fittings in that area.  I have these early housings on HLS30-00249 & 147 but not on my friends 1973.

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Got it in finally... found a 1/2" NPT plug and still had to grind it off to get enough clearance.

Then the provided shepard's hook is too long and had to be shortened otherwise it hits the firewall? 

Grrrrrrr never again!

 

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