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Old 04-10-2008, 08:35 PM   #1
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Default Jamin 21 motors ,What are you opinions??

Hi im thinking of getting a spare motor for my H8. I have a modded v spec and goes really well but wont last to much longer on its 7 ltr.
Was thinking of getting another v spec but there are a lot of choice. I need a motor that puts out good power and easy to tune like the v spec.
I have herd that the Jamin is good and bad so what do others think.
Thanks...
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Old 04-10-2008, 08:58 PM   #2
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My JPX .21 was perfect from day one! So easy to tune and super performance!
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Old 04-10-2008, 09:24 PM   #3
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The JPX .21 is an awesome mill! I have had absolutely no problems. I run it with the JP3 pipe in a Kyosho ST-RR. The power delivery is awesome.
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Old 04-11-2008, 05:00 AM   #4
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7 ltr's through it? That's not even two gallons. Unless you've abused that thing you've got alot of life left in that V-Spec.

But the Jammin motor is a great back up. They don't have the runtime that some of the other motors get but they throw down great power.
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Old 04-11-2008, 09:04 AM   #5
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these are great motors, especially for the price!! i have no complaints at all. bought one as a back up in february but i haven't used any other motor since because i like the motor that much (i have an rb, os speed, & vspec in my arsenal). about two gallons thru it and i am still amazed on how much compression it has. i run a jp3 with os p3 plugs, seems like a good set-up. as long as i had a good tune on the motor, i never had issues on the track as far as having enough power to keep up with the competition. i heard they have bearing issues but i havent had a prob. i would definately buy again. hope this helps...
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Old 04-11-2008, 02:50 PM   #6
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Only thing is keep an eye on the bearings. My piston and sleeve were fine but the bearing were shot. It was after 7 gallons or so but it happened to a few of them here.

That being said, alot of guys for racing will go ceramic anyway. Then you shouldn't need to worry about it.
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Old 04-11-2008, 02:56 PM   #7
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Love it, run mine in my Hper 8.5 and the thing is a beast. I can keep up with the Vspecs and the Rossi's for the most part. A lot of bottom end grunt.
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Old 04-11-2008, 05:32 PM   #8
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I have about a gallon of fuel through mine and it still pinches quite a bit at the top of the stroke but is really starting to come around. not quite as much bottom end as the p5x I ran last year but has top end all over the novarossi. all that bottom end was pretty much wasted on wheelspin anyway. this motor is a top end screamer with an 086 pipe!
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Old 04-11-2008, 07:04 PM   #9
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Quote:
Originally Posted by Scottmisfits View Post
Only thing is keep an eye on the bearings. My piston and sleeve were fine but the bearing were shot. It was after 7 gallons or so but it happened to a few of them here.

That being said, alot of guys for racing will go ceramic anyway. Then you shouldn't need to worry about it.

7 gallons of use on such a high RPM motor is very good for original bearings....I usually change mine out much sooner then that..... These mills seem to hold a good sleeve pinch for an extremely long time, very good metallurgy
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Old 04-11-2008, 07:20 PM   #10
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I run one in my hyper 8, ofna 063 pipe and werks 30% race. 8-9mins run time and pretty much can hold a tune all race day long. Awesome power!
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Old 04-11-2008, 08:28 PM   #11
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Well I just broke mine in and have about 2/3 of a gallon through it and my only complaint is that I ended up having to buy a new starter box due to the fact that the motor is so damn tight. I have to use a heat pretty much everytime I had to start the engine for the first time after letting it cool down.
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Old 04-11-2008, 10:52 PM   #12
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I have a video of one of the JPX .21's that I have modified... this is a video one of my customers shot after a weekend of racing... believe it or not but in this video the clutch has 2 broken springs, so the clutch shoes were hanging up pretty bad... Yet the motor would still idle and had decent bottom end...anyways here is the video

http://hdrcvideos.com/video/03282008/JPX21.wmv
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Old 04-11-2008, 11:01 PM   #13
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I have seem them run and so far they seem to be on par with motors costing much more. If I remember right they are supposedly based (in part or mostly all) on the Picco P7's, I know I read that somewhere, but no clue on where though. Maximo may be able to answer that one.
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Old 04-12-2008, 12:01 AM   #14
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Thanks all ,
Well I think I might get one . I have read a few bad things about them else where but seems no negative feed back here which is good.
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Old 04-12-2008, 09:42 AM   #15
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Teufel Racing...Jpx...Drake...and P7 are all the same...just different heads and color's.
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