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Old 06-18-2013, 10:36 AM   #3361
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What model RB is this? I can't find what it is and it's not on your website. The motor is supposedly brand new and is coming with the 2012 nt1 I just bought. He says there's less than a gallon thru it and IMO its not fully broken in if that's the truth. I paid $100 for it not including the car, did I get a good deal?
It's a great deal. New the RBM3 is 479.

http://www.murnanmodified.com/produc...roducts_id=533
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Old 06-18-2013, 04:44 PM   #3362
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It's a great deal. New the RBM3 is 479.

http://www.murnanmodified.com/produc...roducts_id=533
Finally something worked out for me LOL. Is it the 2012 version? I looked and still doesn't have the same head as the one on the site.
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Old 06-25-2013, 06:35 PM   #3363
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Want to give a big thanks to Uriah Murnan for a great engine and getting the tune right for me, it was still breaking in and giving me a fit. Hes a great guy, and great support tuned it for 3 qualifiers for me at the Byrons race, Badass motor in my Cobra GT!
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Old 06-25-2013, 07:04 PM   #3364
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Want to give a big thanks to Uriah Murnan for a great engine and getting the tune right for me, it was still breaking in and giving me a fit. Hes a great guy, and great support tuned it for 3 qualifiers for me at the Byrons race, Badass motor in my Cobra GT!
Pete, I fully agree, I've used his engines for 5+ years and the have always great power and service. What engine did you run at the Byrons?
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Old 06-25-2013, 07:36 PM   #3365
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Pete, I fully agree, I've used his engines for 5+ years and the have always great power and service. What engine did you run at the Byrons?
His modded Bonito
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Old 06-25-2013, 08:00 PM   #3366
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His modded Bonito
I've got his .25, do you have the .21 or .25? .25 works great on shorter tracks or a lot of infield. 35+21 for faster tracks and a 3 port for club racing. All are good.
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Old 06-25-2013, 08:02 PM   #3367
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I've got his .25, do you have the .21 or .25? .25 works great on shorter tracks or a lot of infield. 35+21 for faster tracks and a 3 port for club racing. All are good.
.21 7 port I believe.
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Old 06-26-2013, 07:50 PM   #3368
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Default temps???

Grinder im running a murnan 353 nova an i need more top end...what temps should i be running this motor at?? Im running a 2660 pipe with the medium header....stock gears on a xray nt1...help please?
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Old 06-26-2013, 09:35 PM   #3369
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Grinder im running a murnan 353 nova an i need more top end...what temps should i be running this motor at?? Im running a 2660 pipe with the medium header....stock gears on a xray nt1...help please?
Temps around 300 are common when getting the most out of the engine. You can also add a head shim. A total of .40mm of shims will help top end. The short 41615 manifold will also increase top end.
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Old 06-26-2013, 10:48 PM   #3370
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Oh yeah an i forgot to add that i run 25% wit 0.50 shims...should i go back to 16% wit a different shim??
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Old 06-27-2013, 09:46 PM   #3371
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Oh yeah an i forgot to add that i run 25% wit 0.50 shims...should i go back to 16% wit a different shim??
That's good. Try the short header, and lean the engine until you get the top speed. It's there.
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Old 06-27-2013, 10:34 PM   #3372
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Thanks grinder for all your help....
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Old 06-28-2013, 07:51 PM   #3373
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Thanks grinder for all your help....
My pleasure.
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Old 07-08-2013, 03:52 AM   #3374
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Ran my new RB M3 .12 yesterday at Floyd Bennett in my new 2012 NT1. All I can say is WHOA it was fast, I had some issues in all 3 qualifiers with little things breaking and screws backing out like new cars usually do. Still managed to win the B and bump to the A, it's my first time in the A main since I started last summer. My car was definitely in the top 5 fastest over all speed wise and the 1st fastest if I'm not mistaking was a RB also. Murman motors for me from now on.
The only thing is I needed a little more down low but it was there and top speed was more than enough, think I'm geared a little off. Any suggestions on gearing?
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Old 07-08-2013, 03:52 AM   #3375
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Ran my new RB M3 .12 yesterday at Floyd Bennett in my new 2012 NT1. All I can say is WHOA it was fast, I had some issues in all 3 qualifiers with little things breaking and screws backing out like new cars usually do. Still managed to win the B and bump to the A, it's my first time in the A main since I started last summer. My car was definitely in the top 5 fastest over all speed wise and the 1st fastest if I'm not mistaking was a RB also. Murman motors for me from now on.
The only thing is I needed a little more down low but it was there and top speed was more than enough, think I'm geared a little off. Any suggestions on gearing?
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