13LikesMurnan Modified Motors
12-19-2006 | 11:28 AM
#1006
Tech Rookie
Joined: Jul 2006
Posts: 19
I may be interested in a "Murnan Modified Sirio Evo 3 STI". Maybe full ceramic or not. But is this the Ifmar version or the Efra version? I have to race following the efra rules in europe.
Is the cranckshaft the only difference between efra en ifmar version?
Andy
Is the cranckshaft the only difference between efra en ifmar version?
Andy
12-19-2006 | 05:12 PM
#1007
Tech Master
Joined: Nov 2003
Posts: 1,811
From: lima-peru
Originally Posted by andyr74
I may be interested in a "Murnan Modified Sirio Evo 3 STI". Maybe full ceramic or not. But is this the Ifmar version or the Efra version? I have to race following the efra rules in europe.
Is the cranckshaft the only difference between efra en ifmar version?
Andy
Is the cranckshaft the only difference between efra en ifmar version?
Andy
AFM
12-21-2006 | 06:45 AM
#1008
Originally Posted by afm
EFRA has changed the rules as of November 2006 to match IFMAR rules, so there is no longer the restriction on cranckshafts. That's a good move because now engines are the same all over the world (except England, which I think will keep BRCA rules as old EFRA rules).
AFM
AFM
Finally! Now they can experience some real HP over there. 
Just kidding. That is good news though. Why would England not convert to be with the rest of the world?
12-21-2006 | 06:52 AM
#1009
Originally Posted by doki_doki
Will follow your advice. Placed an order for the nova 6 fin conical manifold with 2630 pipe 
Would you happen to know what benefits does one get using a larger diameter crankshaft of 11.9mm as compared to the 11.5mm? Thanks 
Would you happen to know what benefits does one get using a larger diameter crankshaft of 11.9mm as compared to the 11.5mm? Thanks 
12-21-2006 | 07:06 AM
#1010
Originally Posted by Diesel Racer
I've decided I'm going to treat myself to a Murnan engine with full ceramic bearings in the New Year but can't decide out of the following and wonder if anyone can advise?
OS TZ 12 3 Port - I fancy this because it's a little different to the norm here in the UK, but wonder how it stacks up against the modified Nova's and Sirio's in terms of performance and reliability.
Novarossi Plus 12-3 CT - I've always liked Nova's for their performance and reliability but they're not always the easiest to tune.
Sirio Evo III STi - I know some guys have had issues with the crankshaft on the standard engines, can only assume this would be worse on a modified engine, I believe also that the AAC construction yields more power than ABC but it not as long lasting.
Any news yet on a modified RB Matrix R?
OS TZ 12 3 Port - I fancy this because it's a little different to the norm here in the UK, but wonder how it stacks up against the modified Nova's and Sirio's in terms of performance and reliability.
Novarossi Plus 12-3 CT - I've always liked Nova's for their performance and reliability but they're not always the easiest to tune.
Sirio Evo III STi - I know some guys have had issues with the crankshaft on the standard engines, can only assume this would be worse on a modified engine, I believe also that the AAC construction yields more power than ABC but it not as long lasting.
Any news yet on a modified RB Matrix R?
12-21-2006 | 02:36 PM
#1013
Joined: Dec 2003
Posts: 3,840
From: Cebu City, Philippines and Ocala, Florida, USA
Originally Posted by Grinder
I think it is a little performance and a lot of marketing. The crankshaft has a slightly larger inner bore with the new 11.9 outer bore. The crankshaft has slightly more timing. The balance is better with the new crank. Also you have to now buy Novarossi Genuine bearings to fit the engine. No one else makes the 11.9 yet that I know of. Why not just go to 12mm? So you have to buy the Nova bearings. The new engine also has a new head button with O ring to keep out dirt from the head button area.
Will be breaking in the engine pretty soon Which method of engine break-in do you usually recommend? WOT or the conventional one? 
12-21-2006 | 11:08 PM
#1014
Tech Adept
Joined: Jun 2003
Posts: 227
From: UK
Originally Posted by Grinder
I would personally choose the Full Ceramic +12, or LS3. The OSTZ is also fast, but not as durable as the Novarossi engines. The new STI Sirio is much more reliable. The rod is heavier duty, cranks are holding up too. The Evo 3 STI is only ABC. I will be stocking the Matrix engine pretty soon now.
Thanks for the insight, can you confirm whether the ceramic bearings have rubber dust shields or are they unshielded?
Also is the Matrix likely to be in within the next month?
Regards, Mark
12-22-2006 | 03:40 PM
#1015
Tech Initiate
Joined: Nov 2006
Posts: 22
From: Toledo Ohio
I have seen the Novarossi 12-3ct run with the 2630 pipe and the header that come with it at the great lakes race. That set up would of made the lower B main in 1/8 4 wheel drive I can't remeber how was driveing it or what car it was just know what the motor and pipe was couldn't beleave it was not mod. I saw some of them on E-Bay for sale and they where at a go price
12-22-2006 | 04:48 PM
#1017
been hearing alot about EVO3's quality problem. conrod and crankshaft pretty much snap off very easily. so thats y i still dun have the courage to get this engine, even though i know its pretty fierce. 
12-22-2006 | 06:06 PM
#1018
Tech Fanatic
Joined: Mar 2005
Posts: 948
From: Sydney, Australia
Originally Posted by uniquexme
been hearing alot about EVO3's quality problem. conrod and crankshaft pretty much snap off very easily. so thats y i still dun have the courage to get this engine, even though i know its pretty fierce.
12-23-2006 | 08:43 AM
#1020
Originally Posted by doki_doki
Thanks Will be breaking in the engine pretty soon Which method of engine break-in do you usually recommend? WOT or the conventional one?
Will be breaking in the engine pretty soon Which method of engine break-in do you usually recommend? WOT or the conventional one?