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Old 09-26-2008, 01:13 PM   #61
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Mega go for the JX21 its way cheaper than the speed has a treated crank and runs really strong, the vspec carb restrictors also fit so if you still have them its a bonus also, it uses the .28 case to prevent problems with the case spliting at the bottom, personally i cant sway toward a speed for financial reason but i would go std Vspec or the JX21.

What affect does using the OS .28 case (with it's higher volume) and the five port sleeve have on the Ninja JX21's fuel economy VS an OS Speed or standard VSpec? Also, somebody mentioned that a 'new' version of the JX21 will be coming out in the near future. What will be different than the 'old' JX21 (both OS made , not talking about the GRP manufactured Ninja)?
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Old 09-26-2008, 01:59 PM   #62
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You can also use a weighted flywheel, it will have a similar effect... ....

Agree, had three different flywheels for 12's when running 10th scale trucks years ago. Even with a low end Dynamite or block head OS 12 you could feel the difference. I just don't remember the Speed crank feeling that much heavier, but I have never had one of each out at the same time to compare.

Good info guys, thanks.

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Old 09-26-2008, 02:14 PM   #63
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on the hara engine debate, i would think that he used a std V-Spec based on this pic..


unless he decided to use a speed with a 21J carb??
don't think so..
n.e.r.d - the new Speed comes with a 21JS carb (probably the same as the 21J but with the red/metal venturis that come with the current speed).
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Old 09-26-2008, 03:12 PM   #64
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thanks Jaf1977, didn't know tt the latest version of the speed comes with an updated carb..

anyway there's no way to tell a speed from a std v-spec based on the exterior except for the head and carb and backplate.

so we can only speculate what engine hara used at the worlds..

new JX21 (code 01A) should be out now.
not sure of the difference though.
why Mugen updated the engine i wonder why..
(as the 1st gen JX was already an excellent engine)

on a side note, what was the difference btw the B01 and B01A GRP Ninjas? anyone knows?

(Megacrash, sorry i hijacked your thread..
and btw, go with the JX21. you won't regret it.
way cheaper than the speed!
plus the OS/Ninja pipe lasts forever!!)
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Old 09-26-2008, 04:29 PM   #65
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Originally Posted by n.e.r.d View Post
thanks Jaf1977, didn't know tt the latest version of the speed comes with an updated carb..

anyway there's no way to tell a speed from a std v-spec based on the exterior except for the head and carb and backplate.

so we can only speculate what engine hara used at the worlds..

new JX21 (code 01A) should be out now.
not sure of the difference though.
why Mugen updated the engine i wonder why..
(as the 1st gen JX was already an excellent engine)

on a side note, what was the difference btw the B01 and B01A GRP Ninjas? anyone knows?

(Megacrash, sorry i hijacked your thread..
and btw, go with the JX21. you won't regret it.
way cheaper than the speed!
plus the OS/Ninja pipe lasts forever!!)
as i understand it the only major change is a lightweight head
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Old 09-26-2008, 07:26 PM   #66
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Well you definately have some good choices in engines. I think it would be pretty hard to go wrong with any of your choices. I first want to say I have zero experience with the OS brand. Other than seeing them in action and definately are good engines. I heard of the leaky issues many times and the short life span. However I can't testify to that.

However what I do know is the WS7 is an outstanding engine. One thing is for sure you will not hear these things mentioned about an RB. Short life, hard to tune, leaky bearings. For the money and the realiabilty I choose RB's. The last thing I want is to have to buy two engines in one season. Or have my engine let me down during primetime. From reading your thread your pretty wise to engines so I doubt the who's fastest argument holds water with you as it does not with me. Always comes down to who is the better driver. Top speed only matters in a drag race. Fortunately for us we don't drag. Our races are determined on acceleration out of turns, proper lines, realiability, pit strategy after the 10 min heats and driver focus. Top speed of a buggy engine rarely comes into play. Just not that many tracks with long enough straights to even get a buggy to top speed. Even when you are at a track with long straights it's not long before your back on the brakes to drive the other 80% of the track.

Just a side note I bought a used Go Tech 7 port (about a gallon on it). It took me ten minutes to find the tune and damn those engines are a beast. I am not in anyway saying that they will out run a speed. I will say this much for it theres not much out there thats just going to walk away from it. Best $100 I spent in a while.

Whatever you get have fun let us know how your choice works out.

Good Luck!!!
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Old 09-27-2008, 06:36 AM   #67
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i am on my second ws7iii.. i have well over gallons on it with 0 issues..
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Old 09-27-2008, 08:48 PM   #68
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i am on my second ws7iii.. i have well over gallons on it with 0 issues..


Wow...thats alot of gallons.
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Old 09-27-2008, 08:53 PM   #69
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well i got14+ out of the last one on all original parts.. so i would say they arent to bad



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Wow...thats alot of gallons.
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Old 09-27-2008, 09:00 PM   #70
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well i got14+ out of the last one on all original parts.. so i would say they arent to bad

re-read your original post...its meant to be a JOKE.
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Old 09-27-2008, 09:06 PM   #71
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14+ gallons without needing pinched or parts ? Even for a RB I find that hard to believe .
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Old 09-27-2008, 09:58 PM   #72
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I had a Picco do that & I liked the power delivery better after it had zero pinch just slight compression.It all depends on what you like your power to feel like it stiil was as fast as every other motor except on the tightest tracks or high elevation.
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Old 09-28-2008, 07:02 AM   #73
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well i got14+ out of the last one on all original parts.. so i would say they arent to bad

even with your poor US gallon compared to ours 14+ gallons how many does the + correspond to the current gallon or another 5 or 6 sounds very good possibly to good
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Old 09-28-2008, 07:55 AM   #74
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Thanks to you all gents,

looks most likely to be a vspec im going for been offered a good deal on one by the shop i run for so thats swayed it a bit, also going to buy a speed crank from hk for it to. Just need that to arrive as well as the mbx6 and im ready to rock
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Old 09-28-2008, 09:06 AM   #75
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ake sure you get the Speed rod aswell, that will expand the engines life span aswell as it has the channel in the rod to lubricate.
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