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Datsun B310 turbo coupe, A15 project


Atomic

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If its turbo it wont rely on the intake pulses to feed the cylinders on boost.

 

The intake will be pressurized, so its forced and already pushing at the valves with the charge.

 

The camshaft plays a huge role in a boosted motor.

 

Yeah, I'm mainly trying to affect the curve when there is close to none boost (under 3k RPM). 

 

''Turbo applications will generally find best results with long runners, which provide a broad, flat torque curve at low speeds, while the turbo keeps the top end strong. In the fuel injection applications where only air is moving inside the runners, the runner design becomes free to go up, down or sideways.'' - Corky Bell, Maximum Boost

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Check this design, you just really want the intake air to be evenly distributed to all the cylinders, and have as little angles and edges as possible for the air shown here.

 

It would be fun to do it and adjust it to see what happens.

 

Yeah, that's going to be the other problem when I'm done crafting the tubes. I have some designs in mind for evenly distributed plenums. Will see how I'm going to do that, I have some basic formulas and may try to make a symmetrical one, we'll see

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Got new autogauge meters, water temp, speedometer, tachometer and boost gauge. All with adjustable light, peak and warning functions + controllers:

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Tacho and speedo were 95mm, seems like a perfect fit for the original dash:

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And boost gauge slides in to the clock pocket:

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Used soldering iron to get into tricky parts to remove some sections from out of the way:

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Tadaa...:

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Cut some foam to pad them:

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Closed the case, they're nice and snug in there:

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First start up, white colors:

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But going to use amber most likely:

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Also installed oil pan in this position, was pain in the ass, took me 1hour...

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Bought a new underbody coat gun and sprayed really thick layers to the bottom of the car:

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So I got the engine and transmission installed. Filled the tranny with 2L of that redline racing oil, also bought some 75w90 for the rear axle.

 

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It was real pain in the ass to install the tranny and motor back again.. First there was a small breather hole that leaked when I lifted the combo up.. Had to close that with aluminium tape.. Then the transmission started to leak from the bottom seals... But it was all due some bolts were not torqued fully.. So I took the shifter assembly off for the time of assembly. Finally everything torqued and no more leaks.. It was really annoying to put a small guiding pin to the end of the transmission where the linkage system for shifter was.. Spent good 3h with this battle, didn't take any pics because got a bit frustrated :rofl:  :rofl:   

 

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Should probably clean the garage again  :angel:

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Got the drive shaft installed, it's about 14mm off centerline, hopefully that wont affect much..

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Need to think how to mount the slave cylinder for clutch fork:

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Had to rise the front about 5cm because the tires were hitting the fender lips because of all the weight at the front:

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Bought new brake calipers for rear axle:

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Random shots:

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Cleaned the garage a bit  :angel:

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Lots of pictures today, so:

 

Bought more brake parts, new brake pads, T-fittings and assembly kit:

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Also got free Mazda MX3 coupe seats:

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The dirver side seat was almost bolt on with datsuns original rails, had to extend the rail on the drivers side door a bit, but the one next to drive shaft tunnel is direct bolt on, also the width is the same, so no extra work required besides the weld on extension:

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Passenger side was trickier, I had to extend both of the rails about 3cm, but bolted to the floor nicely:

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The seats feel nice and suit the car imo:

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Driver side seat has 3 adjusting levers, you can control the pitch (how high your elbows will go), height of the chair and ofc the normal skew:

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On the passenger side, it has a small pull mechanism for quick release the seat so you can get easily off from the backseat:

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Put the doors on and took some random photos:

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The plan for the chairs is to holster them to suit the original seats, so black leather to the sides and headrest + backside and then black fabric to the middle of the seats

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  • 4 weeks later...

Sorry long time no updates, have been really busy with bachelor thesis. Here are some photos of the new gauges:

 

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I'm thinking about replacing the fuel meter gauge with water temperature gauge, so all 4 gauges will be matching style and color. Still need to think about where I want to mount the shift light etc

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Re:

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The original Ramchargers were engineers from Chrysler and they experimented in depth with intake runner lengths with their favorite hobby (drag racing) after work in the '60s.

 

If over the valve cove, it doesn't have to be at 90 degrees. You could lean them all forward to make a larger radius bend which would also lengthen them. Fit easily removable silicon hoses over the valve cover area so you can get at the valve train.

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Autometer gauges look nice, Glowshift is another company that does budgets fully programmable stepper gauges with Start-Up shows.

 

Suggestion... bang out your first manifold design to get it running asap and dyno it.  All the the while make some big changes to it and dyno a new manifold to see how it really works.

 

Calculated numbers dont take into account, blow by gases, octane, injector and ignition tune, and real reciprocating mass loads.

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Autometer gauges look nice, Glowshift is another company that does budgets fully programmable stepper gauges with Start-Up shows.

 

Suggestion... bang out your first manifold design to get it running asap and dyno it.  All the the while make some big changes to it and dyno a new manifold to see how it really works.

 

Calculated numbers dont take into account, blow by gases, octane, injector and ignition tune, and real reciprocating mass loads.

Yeah, I'm pretty glad that how they look. Still need to place lambda and oil pressure gauges somewhere.

 

And I'm lacking time at the moment so haven't had time to make the manifold. I'm trying to write my bachelor thesis ready by December 

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That's a 620, and yes it should. The small diameter boosters are pretty much all interchangeable. 

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Is there a recommended percentage of plenum volume to engine size?

 

''Virtually all fuel injection manifolds will have a plenum. The plenum volume should be a function of engine displacement - in general, 50 -70%.'' - maximum boost, Corky Bell

 

 

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  • Atomic changed the title to Datsun B310 turbo coupe, A15 project

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