stoney452

iTrader: (1)

Yeah I talked to guy from San Antonio back in Houson in 2013 that was running at the roar race that year and he really liked it would be a great engine for my other car.thanks michael

Frank L

iTrader: (148)

I ran a 2060 pipe and a square nova header last weekend and pulled 11:05 on a tank. This engine is very promising.

TRUGGYRACER1

iTrader: (42)

In buggy or truggy

Areno

I just picked up a brand new xz Speed 2. I'm going back and forth trying to figure out what pipe for my buggy. I have done research on this site but no clear info, Unless I'm looking in the wrong places. If I understand 2090 is used for truggy to provide low end grunt and the 2060 is more for mid to top.
Oh yeah, i have read this engine can run over 11min??? Can't wait to see that.
Thanks for input...

Motorman007

iTrader: (89)

Dyno Dan
AE

Join Date: Jul 2008
Posts: 254
Trader Rating: 0
Default
Not to start any controversy, but here is my opinion of the Speed line of motors:

- I have been running Speeds since their release in early '07

Starting with the newest Speed first:

B2101: smooth power, more linear than the XZ-b long stroke. Easier tuning window than the long stroke XZ-b. Shorter stroke than XZ-b is easier to break-in. Adequate peak power, but not enough torque down low for truggy. mileage is slightly better than the XZ-b line. Best pipe is OS 2090

XZ-b Spec II: An improvement over the original XZ-b. OS returned to the #1 long needle for the low speed adjustment. Easier to tune than the original XZ-b. Power is actually soft waaaay down low, then a massive hit in the midrange leads people to believe that peak power is insane. Top end flattens out a little faster than the B2101. Over all the powerband is aggressive with a huge hit, but can be a bit much for some. Best pipe is the 2090 or 2050 if you can find one. Long strokes are a bit more finicky to tune and to keep lit as they have more stroke under pinch. Needs a heavier flywheel to overcome the longer stroke. Mileage is about the same as the B2101 if not slightly less.

XZ-b Speed: This motor tends to get a bad rap as being hard to tune, finicky, and over powered. As I mentioned before, the massive midrange hit fools people into thinking that the peak power is massive. Actually the position of the peak power of this engine is very up-front and leads to a lot of wheel spin. Torque down low is adequate, but the mid range hit can be a problem. Tuning is a bit more tricky. I do not suggest this motor for a newbie or mid level racer. This motor also suffers from "long stroke syndrome" and has more stroke under pinch. This results in longer break-in times, tricky idle settings, and smaller tuning window.

VZ-b Speed (Magnesium Gen I - Aluminum Spec II): In my opinion one of the best nitro motors ever produced. Excellent runtime, power galore, and the most useable powerband ever produced in a nitro engine. The short stroke configuration makes tuning extremely easy. Best pipe: OS 2050. The only problem with these motors is that the crankcases will crack, rendering the motor useless. I loved these motors and still have many new in box.

Protek Samurai: This motor is a short stroke VZ-b Speed in an updated, stronger case. It runs exactly like my favorite VZ-b Speeds. I tested it back to back with my older VZ-b Speeds. After spending years with the XZ-b long stroke motors, I had forgotten how smooth and powerful these engines are. Tuning window is extremely wide and easy to tune. Power is more useable than the XZ-b line and actually produces a wider spread of power. Top end is considerable stronger than The XZ-b line. Best pipe: OS 2050.


I spent many years trying to get my XZ-b motors to feel like my old VZ-b Speeds. I could never get a smooth, wide spread of power like my old motors. The long stroke motors are a different animal. I love my Samurai and it amazes me every time I run it. I haven't had that confidence in a motor since I stopped running the VZ-b Speed in '10 when the XZ-b motor came out. I couldn't continue to run the VZ-b Speeds as I could break the cases.

mourinho

iTrader: (46)

so according to dyno dan there is basically no place for the 2060? its all 2090 or 2050. or is the 2060 a replacement for the 2050?

ive generally been a Picco and Novarossi user so im not too familiar with OS, however in 2016 i started to run the b2101 with 2090 and really couldn't ask for much more. its a great combo in buggy, and highly sensitive to clutch tuning which i like.

Motorman007

iTrader: (89)

2090 is a 3 camber pipe for noise. The 2050 is a 2 camber pipe.* 2090 Is a replacement for the 2050.
For truck you can do 2060 and 2050 header or a novarossi Sq header aka L shape header. MAX DUDE Did a dyno test with the 2060 and novarossi header

bypass911

iTrader: (14)

Fellas what size venturi you all running on your truggies? Spec 3 came with 6 and 6.5
6.5 enough for truggy? How lean you guys running at?

Lasse Poulsen

Hi Guys

I have now done break in on the O.S Speed Spec 3. It runs perfect. and leaned HSN and LWP in and all is good with engine performance, temp etc.

But when it ideals for 30 sec. Then you give it full throttle - The engine dies..

Whats the solution ?

Motorman007

iTrader: (89)

8

jfl11

Reading this post, I note divergent opinions about the best pipe to use with this engine for a buggy application.

May be some buggy users could give their point of view.

Many thanks

RMKinWI

iTrader: (15)

What do you guys think of the new carb (21c)? I wonder what the smaller slide does? The insulator is also different? Appears the needles are not changed. The mid seems to be turned in from flush more compared to the old 21j.

Motorman007

iTrader: (89)

I run the 2090 in buggy..

I believe 80% of people run the 2090 in buggy.. Sir

Rafa_kyosho

What are the needle settings for decent tune obviously ill have to adjust it for my environment but just to see what ohers have?

bypass911

iTrader: (14)

Dayum! An 8? I was thinking 7....