Datsun Roadster Forum-311s.org

I know it can be done cuz I have seen a picture of it. (I just have no way of contacting Hoop.)

http://rabbit.circa.ufl.edu/gallery/roadster_dreams/abb

While I am attempting to revive my Harlee... In the manual I got 0-60 mph for the U20 is about 10 seconds. I hope this inaccurate. If this is true, please tell me otherwise.

I am trying to do some research and analysis on Supercharging my 69 2L (after I get it to start.) I have looked around and can't come to any candidate to be the installed Supercharger.

The best Supercharger type from what I've reading is (in my opinion) the screw type. I was able fine dual SU compatible Supercharger that is suitable for a U20 motor. However, that Supercharger - the Shorrock C142B - from that era is no longer in production is basically a collector item.

http://www.almar.easynet.be/shorrock.htm

Can any of you guy's help?

You might want to try the solex set up, both before you try supercharging, and with it. The 0-60 times were much slower due to a total lack of traction, I think if you were to try on a good set of sticky tires now in a 205/55/14 or 195/60/14 you will find they are quite a bit quicker. I have a feeling that my solex 2L will be in the low to mid 7s.

I have recently been kicking around the idea of turbocharging a U20...but I would use a FI system to make tuning easier. I know most people think it will be veery difficult to set up a FI system on our cars, but I am of the opinion that the new generation of engine management is fairly easy and almost affordable. I was considering the motec M4 or Tec3 systems. The challenges will be installing all the necessary sensors, temp, map, ttpositions, camposition, and crank, then developiong the base maps after that a day of tuning on a dyno and I should be good. I know I'm optimistic.

Now plumbing the turbo...I'm a little worried.

As for a supercharger if you go to a FI system you could use a centrafugle (sp?) which would make mounting easier. But be warned forced induction in front of the carbs are a bad idea as I had the misfortune of discovering.

Goodluck

Ian

One of the vendors already did a Turbo U-20 if I recall correctly....

Sid

Yeah, Sid, I think it was Mike Kerr of Roadster Restorations.

Steve

Thanks Ian...

I too was entertaining the thought and inferred to my self (and modest budget) that that in FI would be more suitable.

I don't know if this will do the trick, but how about a FI throttle body? Weber has just come out with a 40mm DCOE throttle body with linkages on the right and left side. With an adapter plate and setting the valves and what not to Sloex seetings initially can this work? Any input on this guys?

http://www.piercemanifolds.com/newproducts.htm

Minh,

I'm in Elk Grove, off Bruceville and Soaring Oaks. I've got a '70 1600, as well as a '66 PL411 (Bluebird). Drop me a line - ambradley@attbi.com

Adam

I think I have found the donor SU carb. It is from an MG, and it is a single carb turbo setup.
http://www.mgcars.org.uk/carclub/fwdreg ... s/cars.htm

The displacement are pretty darn close to the U20's 1982cc. I have mentioned that I am now biased in favor SU carbs over Solex, Mikuni, Weber types...

Anyone want to by a pair of rare brand new dual throat 45mm SK (Sanyo Kikko)?

Anyways, the search continues, and if this is successfull this wil be the way to go. Hopefuly I can forget about the quad Mikuni and SU setups too.

TWM induction makes TBI setups that could work. They also have fuel maps for the L20B wich is very close to the U20 but doesn't rev as high. I have been thinking about trying to build a fuel infected U20 just to do it. I just don't have any $ right now, but that could change in the near future.

Will

What? Do my eyes deceive me? Will is looking to do an EFI set up? Your one step closer to doing that SR20 swap. Bwaaaa haaa haa haa.

I've been looking into it for quite awile. Its all about building something no one else has done. The U20 is a great engine, I will race any one of you guys who have a KA or SR20 swap (not going to mess with a DET, way to easy to get lots of power out of one). I bet I get as good if not better gas milage with carbs as you guys do as well.

The TWM induction setup is something that no one has even tried before on a roadster, and it still looks like it has a set of carbs on it (and sounds like it as well.) I'd feel a lot better supercharging a U20 with the TWM setup over carbs because you can program your fuel maps to suit your needs.

Will

Ah, I'm just flicking ya a little crap there Will. Gotta keep you on your toes!

An injected, supercharged, U-20 sounds awesome. I'd love to see someone build one!

BTW, I'm not going to take you up on that fuel economy challenge. I discovered I'm running 10:1 AFR at wide open throttle. 13:1 at cruise. Ouch! I'm in desperate need of an adjustable fuel pressure regulator. There's big SUVs out there getting better gas mileage than I am right now.

I just went 70+ miles on a little over a quarter tank of gas. However around town I get 5. Yes, 5 mpg. .

Will

Dave wrote:There's big SUVs out there getting better gas mileage than I am right now.

Yeah, but who has more fun driving?

If you can find one, the fuel injection system , with or without the turbo from a Volvo B21F or B21FT is dirt simple. Constant injection, No wiring to the injectors,no mass air flow sensor and cheap parts. If you can weld aluminum, the plenum on the manifold would fit across both carburetor flanges.