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Old 12-21-2007, 07:45 PM   #16
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I have been running the Jammin 21 for awhile now. It has 3+ gallons on it, and still running strong. It even still ahs a great thump. If you run a JP3, it smoothes out the powerband. I run a JP3 with a 7mm restrictor, and get 8-8 1/2 per tank. I will not hesitate to buy another one! Great engine!
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Old 12-22-2007, 12:23 PM   #17
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Great thread, thanks to all for some good info. Its nice when a person ask for an opinion and you don't try to car sales them into the motor that only you run.
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Old 12-22-2007, 03:15 PM   #18
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Who makes the Jamin motors????
I read a track report in Xtreame Cars and was a RTR CRT.5 with a Jamin motor in it. What i did notice is the block had a Force motor logo on the block and Carby..
What are your thoughts????
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Old 12-22-2007, 03:17 PM   #19
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Quote:
Originally Posted by MadRacer View Post
Who makes the Jamin motors????
I read a track report in Xtreame Cars and was a RTR CRT.5 with a Jamin motor in it. What i did notice is the block had a Force motor logo on the block and Carby..
What are your thoughts????
Picco makes the Jammin motors....... a Jammin JPX 21 is a Picco P7R EVO2..a Jammin JPX .28 is a P3 28......
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Old 12-23-2007, 03:27 PM   #20
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Yeah i noticed the Jammin .12 is made by Force .. Havent seen the .21 yet ..
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Old 12-23-2007, 03:46 PM   #21
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the Jammin JPX 21 is a rebadged Picco P7R EVO 2.......excelent motor with a huge broad powerband..it has alot of bottom end and a killer top end..Judging from dyno results the Picco has the bottom end of the Go5 port and the top end of the Go7 port all rolled into one...... Now of course results are also very dependent on tuned pipe used..a JP2 will kill this motor dead, so will a Picco 069................I really like both the Go and the Picco engines... but I do think the Picco has a little nicer machining and material quality, as well as a slight performance advantage .. also the Go piston is cast, while the Picco piston is billet..

Both the Picco and the Go have similar carb issues, both often needing to have the carb barrel sealed to the main body...where the composite and aluminum meet it is prone to leakage when the aluminum gets heat soaked and tolerances change.......... Most people didn't even realise the Picco's also leak like this which can lead to tuning nightmares....the Go engines leak the exact same way... another issue with the Picco carbs is the slides sometimes bind up when heat soaked, so sometimes it takes some sanding and polishing to get the slides working free and smooth.

All in all both are great motors, i will be running both this season... My Picco as my main engine and my Go as my backup, at least till I test the modded 7 port Go !!!

Overall for modding I can see the Go 7 port having more power potential then either the EVO2 or the Go 5 port... which is saying alot as the modded P7R EVO2 is absolutely bonkers for a .21..I really like the 3 port MES style exhaust the 7 port has.... with some modding the 7 port will be a big winner.......not to mention the 7 port makes huge power with relatively conservative port timing...IMO there is alot more power to be wrung for the 7 port....
Nice write up Neal. I agree with alot of your views on this as always. But the GO making more then the Picco after modified I would have to see for myself Definitly not saying it wouldnt... As it all depends on who gets there hands on that engine to modify it. As you know this makes or breaks and engine. And you as I also know it takes more then just raising port timings higher to make power or just putting some nice pretty cuts on the sleeve or crank and polishing it up all pretty. You have to know where when and how much to alter timing profiles. And dyno data is the best way to go about this and gain this knowledge.
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