Max torque from a SMW 127 Ultima@ 2500-4500: How do you build it?
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Intermediate
Joined: Aug 2006
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From: Woodlawn, TN - Ft. Campbell, KY
Max torque from a SMW 127 Ultima@ 2500-4500: How do you build it?
Engine experts help me out! I do have a couple of dollars to spend on this motor, however, I like to do things right the first time. What exhaust, carb, air filter, and head work would you recommend to get this bike to run strong in the normal riding rpms.
Don't get me wrong, this motor is very strong right now even on a bad tune(very rich). I just want to get the max from it in the rpm range that i ride in 90% of the time.
Here is what I am running right now and what I am considering changing to.
What I am Running:
2004 BBC Venom Prostreet
127 Ultima "PROOF MOTOR" built by SMW out of Oklahoma (I HIGHLY RECOMMEND THEIR MOTORS!)
BDL w/outer bearing support and ball bearing lock up clutch
Jim's 6 sp tranny
Spike style air cleaner
V&H Big Radius Pipes
S&S shorty G (no mods, jetted rich)
What I am considering:
RB Racing LSR 2-1
Doherty Machine Power Pacc
Mikuni HSR45
Headwork? (not sure who to go with or the extent to have heads reworked to reach my goals) I really need recommendations here as I have no actual experience with worked heads and their benefits.
Don't get me wrong, this motor is very strong right now even on a bad tune(very rich). I just want to get the max from it in the rpm range that i ride in 90% of the time.
Here is what I am running right now and what I am considering changing to.
What I am Running:
2004 BBC Venom Prostreet
127 Ultima "PROOF MOTOR" built by SMW out of Oklahoma (I HIGHLY RECOMMEND THEIR MOTORS!)
BDL w/outer bearing support and ball bearing lock up clutch
Jim's 6 sp tranny
Spike style air cleaner
V&H Big Radius Pipes
S&S shorty G (no mods, jetted rich)
What I am considering:
RB Racing LSR 2-1
Doherty Machine Power Pacc
Mikuni HSR45
Headwork? (not sure who to go with or the extent to have heads reworked to reach my goals) I really need recommendations here as I have no actual experience with worked heads and their benefits.
Last edited by Force; Nov 5, 2009 at 01:47 AM. Reason: added carb
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Joined: Dec 2007
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A Wood 408 or 9B would drive it up, set correctly.
Did a 120" recently that ripped almost 130 hp and was knocking on the 150 ft/lbs door, with a Wood 9B, Rinehart Duals, G carb/Thunderjetted.
BTW, I'd weld that crank, before embarking on this.
Scott
Did a 120" recently that ripped almost 130 hp and was knocking on the 150 ft/lbs door, with a Wood 9B, Rinehart Duals, G carb/Thunderjetted.
BTW, I'd weld that crank, before embarking on this.
Scott
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Its running rich. Get it to a competent dyno tuner and sort it out properly before making modifications to it! With a big motor like that it could be way down on its true potential at present. Give it a chance to run right and you might be surprised just how strong it is.
Last edited by grbrown; Nov 5, 2009 at 08:08 AM. Reason: Spelling
Thread Starter
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Intermediate
Joined: Aug 2006
Posts: 39
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From: Woodlawn, TN - Ft. Campbell, KY
SMW is Southern Motorcycle Works in Ardmore, OK. They build 127s in house with certain parts upgraded. From what I have read and experienced first hand, their motors are more reliable than the "crate" 127s from Ultima.
So far mine has been rock solid with 5k miles and not a single issue.
http://www.southern-mc.com/engine-transmission.html
So far mine has been rock solid with 5k miles and not a single issue.
http://www.southern-mc.com/engine-transmission.html
Last edited by Force; Nov 5, 2009 at 08:35 PM.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
You might be better sending Scott a PM or picking up the phone! Have you got this thing running right yet?
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Road Warrior
Joined: Dec 2007
Posts: 1,270
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more compression for the 9f and its more upper rpm cam.
9b is a good cam
scott will do a good job on the heads (does that make ya happy now alibi)
altho if it is not tuned correctly you will never know what the results would be.
also go with a borzilla insted of the lsr its a better pipe. or get a borzilla and modify it to acept super trapp discs and tune it for the rpm you want the tq mostly at.
right now you have 2 major obstals with that bike carb too rich and a shitty pipe.
get it tuned first and get a better pipe before i would worry about anyuthing else.
9b is a good cam
scott will do a good job on the heads (does that make ya happy now alibi)
altho if it is not tuned correctly you will never know what the results would be.
also go with a borzilla insted of the lsr its a better pipe. or get a borzilla and modify it to acept super trapp discs and tune it for the rpm you want the tq mostly at.
right now you have 2 major obstals with that bike carb too rich and a shitty pipe.
get it tuned first and get a better pipe before i would worry about anyuthing else.
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Thread Starter
|
Intermediate
Joined: Aug 2006
Posts: 39
Likes: 0
From: Woodlawn, TN - Ft. Campbell, KY
more compression for the 9f and its more upper rpm cam.
9b is a good cam
scott will do a good job on the heads (does that make ya happy now alibi)
altho if it is not tuned correctly you will never know what the results would be.
also go with a borzilla insted of the lsr its a better pipe. or get a borzilla and modify it to acept super trapp discs and tune it for the rpm you want the tq mostly at.
right now you have 2 major obstals with that bike carb too rich and a shitty pipe.
get it tuned first and get a better pipe before i would worry about anyuthing else.
9b is a good cam
scott will do a good job on the heads (does that make ya happy now alibi)
altho if it is not tuned correctly you will never know what the results would be.
also go with a borzilla insted of the lsr its a better pipe. or get a borzilla and modify it to acept super trapp discs and tune it for the rpm you want the tq mostly at.
right now you have 2 major obstals with that bike carb too rich and a shitty pipe.
get it tuned first and get a better pipe before i would worry about anyuthing else.
thanks for the help
Road Warrior
Joined: Dec 2007
Posts: 1,270
Likes: 0
have not used the rb onany big motor buti also do not know any one who has either.
the borzill works its that simple.
it looks just like the fat cat also what size valves are in youtr head now if they are 2 in then you will need a big primary tube pipe like the borzilla.
see if you can get tthe afr and carb trimmed forst it mightt bring a few more ponies and tq to the table not much down low as the pipes you have just blow it out.
the borzill works its that simple.
it looks just like the fat cat also what size valves are in youtr head now if they are 2 in then you will need a big primary tube pipe like the borzilla.
see if you can get tthe afr and carb trimmed forst it mightt bring a few more ponies and tq to the table not much down low as the pipes you have just blow it out.