Never ending Samurai build...

[clemsonjeep]

Got some more work done the past two nights. Now I've got the "filter adapter" side of the carb built. I've ordered the silicone pieces to get things hooked up. Hopefully those will show up by Friday and I can knock out the charge piping from the turbo to the carb.

I also got the carb tapped with the 1/8 NPT for the pitot setup.

For the "filter adapter" I used 3/16" steel for the flange with 2.25" exhaust tubing for the first section and 2.5" for the outer piece. This allowed me to use the socket head screws without interfering with the pipe. The 2.5" gets me to the right size for the silicone piece I ordered as well as giving me a double wall section which might help out depending on how I end up finishing this setup off. More to come on that...

 

[clemsonjeep]

This box of goodies showed up today from Barnes4WD...

 

[Jon Piper]

I like it !

Im glad you're going to try out the cv. I've always felt it work better than the tbi

 

[clemsonjeep]

Made a little more progress tonight. Started what will be another version of how the mysides and other kits secure the carburetor.

 

[clemsonjeep]

These showed up Saturday...plan on getting the charge pipe built and installed with the pitot tube and blow-off mounted tomorrow.

 

[clemsonjeep]

Spent some time on the lathe this morning. No reason I had to...just hadn't had a reason to use it lately. Turned the pitot tube fitting as well as the connection for the blowoff and got them welded to the charge pipe. Also got the silicone hoses cut to size and the charge pipe installed.

I believe Jared said bigger is better when it comes to the pitot tube and I think he's using 1/2". Right now the fittings I had on hand were 1/4" so I drilled the majority of the rod to a little over .4" but I left the last .75" drilled smaller and turned down to accept the 1/4" hose. If I need to go bigger all I'll need to do is cut off the "nipple" and use larger hose.

Hard to make out...but the pitot tube reaches in to approx. the center.

 

[infamous1]

Re:

Slick man!! Looking foward to seeing it up and running.

Sent from my Z750C using Tapatalk

 

[clemsonjeep]

Well here it is a month later and I've finally got this new CV carb setup working correctly. I started out only spending an hour or so a night on it, but the last week or so I've been beating my head against a wall for several hours each night trying to figure this crap out. I kept getting fragments of good information from various sources and being that my mind works more so on a fix individual issues rather than the big picture I really just couldn't get it to come together. Then once I realized I was being dumb I backed up and took another look and realized I was overlooking a very simple problem.

Being that I'm running the turbo, and using a pitot tube to pressurize the float bowl on the carburetor I also needed to prevent this pressure from escaping the bowl. Well...the hole on the front face of the carb was blocked with my filter adapter that I made so I ruled that out from the get go...and thats where things fell apart. I knew the overflow tube on the bottom of the bowl would allow fuel to pour out if the bowl was over filled, but it didn't even occur to me that the boost could make its way out this same opening. At one point or another I hooked up a tube to this port in order to capture the fuel into a container. The next time I revved it I noticed spray from this tube...AH HA!!!! So I put a plug on this line...and all was well.

At this point I'm running the 40mm carb from a 91 model bike with a 48 pilot and I've drilled the main jet out to what amounts to a 390 size jet.

I've also got a 44mm carb here, but the last time I mounted it up I was confused why it would act completely different than the 40 with the exact same setup. Again...I wasn't looking at the big picture. At that point the largest jet I had was around a 250...so I'm guessing based on the idea that I'm at a 390 now with the 40mm carb I probably just need to go back and try it again with the 390 or maybe even just remove the main altogether.

Bottom line here is that this setup really woke up my motor compared to how it was running with the TBI setup using the FMU and turbo. Going to try it out this Saturday.

 

[Jon Piper]

If you're having to use that large of a main wouldn't it be a better choice to raise the fuel pressure and drop the main jet down accordingly ?

It seems a huge split between the pilot and main

 

[clemsonjeep]

Nope...you can't get much over 2psi before it starts overrunning the bowl at idle. The float and needle can only hold back so much. Keep in mind these were set up for a gravity feed tank setup.

Most of the guys running the CV on a 1.6 8v I've seen were running a 48 idle and 220 or slightly larger without a turbo...

 

[Red97]

Wow...

Just read all 10 pages
Very nice, that rig just plain works.

Love that radiator idea gotta get one ordered.


I must have missed it, but what are the specs as it sits now?

I got it's a turbo 1.6 8v 3sp auto. I will be picking your brain a bit on this at a later date.
Sami case? Gears? Axle ratio? 39 sticky? Wheel base?

This is almost identical to what I have planned for my tracker rebuild.

Thank you for doing such a nice writeup.

 

[clemsonjeep]

Thanks!

Yota axles with:
5.29's cryo/heat treated by Bobby Long
High pinion front 3rd with ARB
Trunion bearing eliminator
ARP steering studs
ARP hub studs
Front high pinion 3rd with ARB
Rear V6 elocker with cryo/heat treated side gears by Bobby
Longfields 30 spline front shafts... originals
Stock rear shafts
IFS wheel hubs
IFS calipers
98 4 runner rotors...slip over hub
Rear FJ rotors, FJ calipers, brackets

Wheelbase is 105 is

Samurai transfer case with 6.5's mounted in a ZOR Snatch

Yep...39" red labels!

 

[clemsonjeep]

If you're having to use that large of a main wouldn't it be a better choice to raise the fuel pressure and drop the main jet down accordingly ?

It seems a huge split between the pilot and main

Another thing to think about is that the fuel pressure doesn't come into play really except to make sure the bowl can remain full. Obviously pressure rises with boost in order to keep up with demand. The fuel is drawn out of the bowl by the flow of air through the carb...not by the pressure.

 

[Red97]

Thanks!

Yota axles with:
5.29's cryo/heat treated by Bobby Long
High pinion front 3rd with ARB
Trunion bearing eliminator
ARP steering studs
ARP hub studs
Front high pinion 3rd with ARB
Rear V6 elocker with cryo/heat treated side gears by Bobby
Longfields 30 spline front shafts... originals
Stock rear shafts
IFS wheel hubs
IFS calipers
98 4 runner rotors...slip over hub
Rear FJ rotors, FJ calipers, brackets

Wheelbase is 105 is

Samurai transfer case with 6.5's mounted in a ZOR Snatch

Yep...39" red labels!

Sweet thanks.

Really hoping i can fit a small rear bench in at 105" and narrow axles.

 

[Jon Piper]

Sweet thanks.

Really hoping i can fit a small rear bench in at 105" and narrow axles.

I'm at 112 and a single rear seat is tight

 

[zukimaster]

I ran a cv carb on my Zuk motor, and I loved it!

 

[clemsonjeep]

Next transition will be to something like this...with the turbo of course...

1.6L samurai with gsxr setup. (Zx10 carbs)

1.6L samurai with gsxr setup. (Zx10 carbs)

 

[Jon Piper]

Sent from my iPhone using Tapatalk

 

[clemsonjeep]

That's one of Fastspec's isn't it?

 

[Red97]

If one was good with electronics/megasquirt

The cycle throttle bodies + turbo would be killer...

Was yours a fresh 1.6 before you put the turbo on?

I'm thinking a cv or especially gsxr carbs would be a performance increase from the tbi. But never been around bike carbs. Not sure how picky they can be in 30* and under weather here in mi.

This thread is very bad for my piggy bank...