northernz

Datsun Spirit ITB's

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Hi all, decided to share my recent install of Datsun Spirit ITB's. Got tired of fiddling with the SU's and I always liked the look of 6 velocity stacks on these engines. A friend at work loves my car, but he is a young guy who likes modern stuff! He tried to get me to swap in an RB26, we compromised on ITB's. He provided his garage and his labour for the privilege of working on the car!  The motor is bored out 85mm, 280Z crank, 268 comp cam with a street port and polish, it was always very finicky with the SU's, for some reason the weather seemed to affect the way it ran and idled, and it always ran rich even with nozzles turned down to only a 1/2 turn from closed. Anyway that is all history!

Several thousand dollars saw delivery of an ECU masters Classic black ECU, ECU masters wiring harness ( very good value, all labelled for each coil, injector and sensor for about 110 US),Burton fuel sump which allows retention of all fuel lines and mechanical pump,One Six Industries crank angle sensor, Patton Machine coil bracket, F150 coils, and of course the beautiful Jenvey ITB's, manifold, injectors and Datsun Spirit designed heat shield. 

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Well, all my pictures are out of sequence! Everything went pretty smoothly, thanks to  my buddy Nabeil, We are still tuning, will be putting it on a dyno on Sept 12th!

I will post some pictures with the wiring finished and loomed.20190721_132904.jpg

 

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Fantastic, what a beautiful setup, looks well laid out. Will you be using filters on the stacks?  How soon before to spring for those beautiful basket of snakes headers he's selling now?

You know the only thing that grabs my eye is the throttle cable arching over the valve cover, they have handled it well on the firewall but it wouldn't take much to come up with a more discreet way of routing that cable near the TB's. It might just be me, stuff like that just begs for a little tweak. Looking forward to hearing when you're done.

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Hey Grannyknot, I talked to Eiji at Spirit Datsun about a filter setup, he said "where am I driving, the Sahara?"! Doesn't use them  at all on his car. I think I will get some socks to filter big particles if I'm going on a road trip. We tied to keep the mechanical linkage for the throttle, but it was really too much bother, would of had to replace the throttle shaft . I'll look at the routing for the cable, we tried to keep a gentle curve so the cable wouldn't bind. The fuel lines around the sump are not too pretty, but I wanted the sump to make it easier to revert to stock setup.

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Sorry brother, didn't mean to criticize your work, what do I know?  I just pictured a small pulley right behind the throttle shaft linkage that would turn the cable 90 degrees and run it along the bottom lip of the valve cover and another pulley on the fire wall to take it to the bell crank.

I think @wheee! did something similar recently, it looked really clean.

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Order a motorcycle twist throttle cable. It will have a metal pre-formed 90 degree bend at one end that will work perfect for your application. Love the ITB's. Always wanted to do that set up!

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Why bother with the heatshield if you're just having the bodies open to the hot air above the exhaust?

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I believe a lot of the heat gain in carbs and itb's is through radiation not convection. I believe Ive got that right. So blocking the line of sight with an appropriate medium greatly reduces heat gain.

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Heat shields are for radiant energy, not hot air.
I believe a lot of the heat gain in carbs and itb's is through radiation not convection. I believe Ive got that right. So blocking the line of sight with an appropriate medium greatly reduces heat gain.
I appreciate that, but why bother keeping the TBs cool? Surely they don't transfer a significant amount of heat to the air going in, and they're insulated from the injectors and anyway the injectors and the fuel rail hold very little fuel compared to carbs, so...?
Maybe the answer is that its easy so why not. I'll be installing ITBs over the winter and it's a question I hadn't considered.

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18 hours ago, northernz said:

Hey Grannyknot, I talked to Eiji at Spirit Datsun about a filter setup, he said "where am I driving, the Sahara?"! Doesn't use them  at all on his car. 

He builds engines.  He probably just rebuilds his every 20,000 miles.  And never drives through construction zones or if the wind is blowing.

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2 hours ago, jonbill said:

I appreciate that, but why bother keeping the TBs cool? 

Keeping the injectors cool is probably worth doing.  That is the source of the heat soak/hot start problem for many EFI systems, apparently.

If the shields block air flow then they also block hot air rising from the exhaust system.  So, dual function, radiant and convective.

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Keeping the injectors cool is probably worth doing.  That is the source of the heat soak/hot start problem for many EFI systems, apparently.
If the shields block air flow then they also block hot air rising from the exhaust system.  So, dual function, radiant and convective.
Good to know, thanks.

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1 hour ago, Zed Head said:

He builds engines.  He probably just rebuilds his every 20,000 miles.  And never drives through construction zones or if the wind is blowing.

I recently rebuilt carbs with no filters. What a pile of dirt and silt inside. The engine is also blowing oil through the top of valve cover so open air engines is not a good thing nor cool based on first hand observations.

I notice a lot of road grit is thrown up by the vehicles in front as they pass over it.  It is very noticeable when traveling behind a truck with a Jersey Barrier on the side. Grit collects at the barrier and you sand blast your car as you drive through the wake of the truck in front.

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Those honeycomb filters look like the perfect compromise, I really like the look of them.The heat shield works very well for radiant energy off the headers, just using the back of my hand I can feel the difference in temp above and below the shield.

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I'm doing the same.  Super cool setup!

Your set up looks great!

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If you want. I would sell you my honeycomb filters at a loss. I don’t like the look of them for some reason. The fit is tight. But they work. 

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