OS Speed B2101 engine
01-31-2016, 05:19 PM
#467
Hi, the idle after a straight is perfect, if I wait 5 sec goes up therefore I think is rich but if turn just 0.5mm it become lean because when I wait 5 sec I get the metallic sound and the temperature goes up to 100* . I also tried to rich the top to see if it was going to help the bottom but it did not, it just become rich on top. Having said that, about the pinch I can not turn the engine from the flywheel when its cold also without glow plug. Does this mean that I still need plenty to go before I finish the break in?
Thanks
Thanks
01-31-2016, 11:23 PM
#468
If you're blowing a front bearing in the first gallon then you're doing something very wrong.
02-23-2016, 12:57 AM
#470
Does anyone know the difference between the Ninja JX21B03 and the B2101 besides the obvious external cosmetics?
02-23-2016, 01:38 AM
#471
Tech Regular
Looks like an OS B2101, same capacity 3.46cc etc
http://www.mugenseiki.com/images/nin..._jx21-b03e.pdf
If you want the same engine, but 'different' look at a MX ...BUT that will cost a lot more.
http://www.mugenseiki.com/images/nin..._jx21-b03e.pdf
If you want the same engine, but 'different' look at a MX ...BUT that will cost a lot more.
02-23-2016, 03:28 AM
#472
Tech Initiate
I have a tech question for those who know. I'm currently rebuilding my Samurai, Spec 2 and B2101.
1. First question - all 3 crankshafts fit each engine though each have slight differences. Despite this the timings are all the same regardless which combination I use! Therefore can I put a B2101 crankshaft into a Spec 2?
2. The piston/sleeve/con rod for the samurai is different to the Spec2 and B2101. However the piston and con rod for the Spec 2 and B2101 are the same. The sleeve for the Spec 2 and B2101 are different. I thought the Spec 2 was a long stroke and the B2101 a short stroke so how come the con rod and pistons are the same and similarily the crankshaft?? Is it only the sleeve which makes a difference???
Basically I prefer the Spec 2 over the B2101, so if I can use my B2101 crankshaft, front and rear bearings with a new rod and use my current Spec 2 piston sleeve in a Spec 2 crankcase it would give me a new Spec 2 engine without having to spend anything!
Clear as mud? If anyone has the expertise, be great to hear back, Cheers
1. First question - all 3 crankshafts fit each engine though each have slight differences. Despite this the timings are all the same regardless which combination I use! Therefore can I put a B2101 crankshaft into a Spec 2?
2. The piston/sleeve/con rod for the samurai is different to the Spec2 and B2101. However the piston and con rod for the Spec 2 and B2101 are the same. The sleeve for the Spec 2 and B2101 are different. I thought the Spec 2 was a long stroke and the B2101 a short stroke so how come the con rod and pistons are the same and similarily the crankshaft?? Is it only the sleeve which makes a difference???
Basically I prefer the Spec 2 over the B2101, so if I can use my B2101 crankshaft, front and rear bearings with a new rod and use my current Spec 2 piston sleeve in a Spec 2 crankcase it would give me a new Spec 2 engine without having to spend anything!
Clear as mud? If anyone has the expertise, be great to hear back, Cheers
02-23-2016, 03:41 AM
#473
Tech Regular
I dont know if this helps
The B2101 (3.46cc) is know as square, same bore and stroke
Bore: 16.40 mm (0.646 in.)•Stroke: 16.40 mm (0.646 in.
The Spec 2 is not and is 3.49cc
Bore: 16.27 mm (0.640 in.)•Stroke: 16.8 mm (0.661 in
The B2101 (3.46cc) is know as square, same bore and stroke
Bore: 16.40 mm (0.646 in.)•Stroke: 16.40 mm (0.646 in.
The Spec 2 is not and is 3.49cc
Bore: 16.27 mm (0.640 in.)•Stroke: 16.8 mm (0.661 in
02-23-2016, 04:45 AM
#474
02-23-2016, 05:22 AM
#475
I have a tech question for those who know. I'm currently rebuilding my Samurai, Spec 2 and B2101.
1. First question - all 3 crankshafts fit each engine though each have slight differences. Despite this the timings are all the same regardless which combination I use! Therefore can I put a B2101 crankshaft into a Spec 2?
2. The piston/sleeve/con rod for the samurai is different to the Spec2 and B2101. However the piston and con rod for the Spec 2 and B2101 are the same. The sleeve for the Spec 2 and B2101 are different. I thought the Spec 2 was a long stroke and the B2101 a short stroke so how come the con rod and pistons are the same and similarily the crankshaft?? Is it only the sleeve which makes a difference???
Basically I prefer the Spec 2 over the B2101, so if I can use my B2101 crankshaft, front and rear bearings with a new rod and use my current Spec 2 piston sleeve in a Spec 2 crankcase it would give me a new Spec 2 engine without having to spend anything!
Clear as mud? If anyone has the expertise, be great to hear back, Cheers
1. First question - all 3 crankshafts fit each engine though each have slight differences. Despite this the timings are all the same regardless which combination I use! Therefore can I put a B2101 crankshaft into a Spec 2?
2. The piston/sleeve/con rod for the samurai is different to the Spec2 and B2101. However the piston and con rod for the Spec 2 and B2101 are the same. The sleeve for the Spec 2 and B2101 are different. I thought the Spec 2 was a long stroke and the B2101 a short stroke so how come the con rod and pistons are the same and similarily the crankshaft?? Is it only the sleeve which makes a difference???
Basically I prefer the Spec 2 over the B2101, so if I can use my B2101 crankshaft, front and rear bearings with a new rod and use my current Spec 2 piston sleeve in a Spec 2 crankcase it would give me a new Spec 2 engine without having to spend anything!
Clear as mud? If anyone has the expertise, be great to hear back, Cheers
B2101 - square bore and stroke
Samurai - short stroke
Spec 2 - long stroke.
I believe all crank cases are the same - spec 2 style.
02-23-2016, 06:41 AM
#476
Tech Master
Os stated that the B2101 has a compleatly new crankcase.
02-23-2016, 07:54 AM
#478
02-23-2016, 09:52 AM
#479
Nothing like the wide powerband of the spec II. I snapped a rod in the B2101 and put in a spec II. Luckily the rod broke on the bench while tuning on Th box.
In the words of Dyno Dan "that's a mans engine"
Not that I didn't enjoy every time I pulled the throttle with the B2101.
It ran flawless the rest of the week.
In the words of Dyno Dan "that's a mans engine"
Not that I didn't enjoy every time I pulled the throttle with the B2101.
It ran flawless the rest of the week.
02-23-2016, 10:04 AM
#480
Tech Regular
Frank, think I saw your race(via LiveRC) at DNS .. do you have a long surname that ends in 'o'?