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Old 08-19-2002, 12:36 PM   #871
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Default Turbo/Non-Turbo

Dennis, I have a JP RS-12 TS1 turbo which I believe is a 3-port engine, correct? I would like to change the button to a non-turbo. Could you tell me what size head shims I should be using? Also, would this then make my engine ROAR legal? Thanks.
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Old 08-19-2002, 03:25 PM   #872
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Old 08-19-2002, 05:58 PM   #873
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Default Turbo/Non-Turbo

Thanks for the info.. I have a few Mugen MT-12 non-turbo buttons, would they work? Also, how about the ROAR legality? By reading the rule book, as long as it's 4-ports or less with a non-turbo plug it should be ok.? Thanks again.
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Old 08-19-2002, 07:45 PM   #874
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Old 08-19-2002, 08:18 PM   #875
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Thanks for the info. Motorman. If you get back into public sales I'll be the first in line for an RTU.
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Old 08-21-2002, 01:42 AM   #876
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Default Motorman advise please

Motorman what differance does the red bit JP puts in his engine (in the crank) make?
what does it do?
what is it?

i would be gratefull if you could reply as i know you are trying to get away from this sort of thing, but i know your THE BEST!!!!
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Old 08-21-2002, 06:08 AM   #877
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NTC3NUT

I have the same engine as you and wanted to do the same thing.
I just purchased a Hard Core Racing Mutant Head (blue).

It incorporates the cooling and button head in one piece.

It was a direct bolt on fit and it works perfectly. It also runs cooler as well!! I started in the spring with a MC59 plug and am now running an OS8.

Che
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Old 08-21-2002, 01:56 PM   #878
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Che, Thanks for the input. I have a few heads in my pit box including the Hardcore Mutant. I am gong to try the Kawahara Zac head I have with an extra Mugen button. I have had great success with a head made by Powerline. It's for the T-Maxx but it uses a button and bolts directly to a Nova Rossi based engine. I have them on both my Mugens with the stock button and it cut the temps by 30deg. +/-, no kidding. It doesn't look as good as the Hardcore head but it's $20. cheeper and it's 3 times as light. Thanks again for the input, I'll let you know how it goes. Also, I was curious, do you see any drop off in performance by changing the button? This engine is awesome as is and I'd hate to see it fall off.
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Old 08-21-2002, 02:12 PM   #879
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I found the change made the engine easier to tune (for me).
So I actually got better performance out of it, but if it were to fall of due to a non-turbo plug, it can't be that much.

And if your new head allows it to run 30 degrees cooler, you will gain from that!
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Old 08-21-2002, 11:32 PM   #880
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i have been rading this forum fr about 4 months and I finally have a question. Early in the year a got a MT12 with a head with 11 fins instead of nine, I was wondering what the difference is between this engine and the one with 9 fins. Also if you could tell me what the correct needle settings are as i have been having problems tuning the engine for the last couple of weeks.

Thanks in advance
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Old 08-22-2002, 12:47 AM   #881
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Old 08-22-2002, 05:27 AM   #882
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Default MT-12

Nitrodude, My local hobby shop sells both the 9 & 11 fin MT-12. The only diff. is the head itself, and about $10.. If you still have your box take a look at the tag, it says "BIG HEAD".
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Old 08-22-2002, 07:04 AM   #883
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Default Re: MT-12

Quote:
Originally posted by NTC3NUT
Nitrodude, My local hobby shop sells both the 9 & 11 fin MT-12. The only diff. is the head itself, and about $10.. If you still have your box take a look at the tag, it says "BIG HEAD".
I thought the "big head" engines had a different stroke, also.
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Old 08-22-2002, 07:24 AM   #884
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Default "Big Head" MT-12

The 11 fin head engine is the newer short rod engine and I have one. I have tried many pipes and had tuning nightmares, all to find out if you use an Associated pipe it works like a champ ! It pulls my old style (still same run time though) MT-12 from the bottom to the top and seems to have more top end power! Before the Associated pipe, I tried the stock Losi with my XXX-NT, a 1pc. Dynamite, X-12 (almost as good as Assoc.), and a Drake pipe, and they all made it bog down on bottom until it got the revs way up and it ran way hot with them. Hope this helps!
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Old 08-22-2002, 03:01 PM   #885
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Default MT-12

I wasn't aware that the "BIG HEAD" engine was the new short stroke model (neither was my local hobby shop apparently). I've heard good & bad things about it on this website. I haven't run one, both of mine are the long stroke which are awesome. I guess it doesn't matter if it's good or bad, that's all you'll be able to get soon right? I am glad to hear it's running good for you. My only question would be, how will it run in a NTC3 with the only 2 pipes available?
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