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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> 40 hp/40lbs torque verse 50/50 /cgi-bin/YaBB.pl?num=1569664258 Message started by Gary RVA on 09/28/19 at 02:50:58 |
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Title: 40 hp/40lbs torque verse 50/50 Post by Gary RVA on 09/28/19 at 02:50:58 Just pickup a 1997 Savage for a winter project its in fair shape for the age mileage about 18k I have been reading the post on cam, piston, porting and chain conversion - So here's my question what does it really take to bring thumper from stock 31/37 to 40/40(ish) verse 50/50(ish) hp/torqu? Yes I would like to pull a ton, :) and be able to have good cushion of power for pulling away from RVA I64 and I95 traffic that seems to roll 75-80 mph What is the performance sweat spot for this little thumper? And what does it really take to get there ? |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by justin_o_guy2 on 09/28/19 at 12:59:19 What is the performance sweat spot for this little thumper? It's sweating at around 55. And out of air and at near exhaustion at 70. |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Ruttly on 09/28/19 at 13:23:08 $$$$$$$$$$$$ And just when you think it's done ! $$$$$$$$$$$$ |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by BrokeAss on 09/28/19 at 13:57:39 Time for a Raptor 700 engine swap... |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by batman on 09/28/19 at 15:55:18 No not a Raptor 660 petcock (unless you need one), But it is time to check the cam chain tensioner, front dive pulley nut torque , valve clearance , all things that could ruin the motor. |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Dave on 09/28/19 at 16:00:28 I have a modified engine (Wiseco 95mm piston, Stage 3 cam, porting, exhaust, Mikuni carb, double Kawasaki pulleys, 18" rear wheel), and I have had it up to 100.1 mph twice........it really doesn't want to go any faster than that. It gets up to 80 mph pretty quickly - beyond that the acceleration slows down considerably. I think 50HP is a bit optimistic......40 is likely doable. Even a modified engine Savage is not really all that good at 80 mph cruising......but they are a lot of fun in the 60-70 mph range. |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Gary RVA on 09/28/19 at 21:42:07 I don't want to "cruise" at 90 mph, I am happy 65 mph (ish), that said it is a numbers game.. LS650 ~390 lb bike plus 215 lbs of rider so let call it 600 pounds. Stock power (31/37),works out 19 pounds per HP and 16 pounds per foot pound of torque. Stock Sportster 883 489lbs +210lbs=~700 stock power ~(45/53) works out to 15 pounds per hp and 13 pounds per foot of torque ... So to match the 883 numbers the Savage would need 40 horse power and 46 ft lbs of torque. Just to cover the bases Stock Sportster 1200 , 530lbs bike +210 lbs rider=~740lbs Stock Power (59/67) 12 lbs per horse power and 11 lbs per foot of torque To match 1200 the Savage would need 50 hp and 55 foot lbs of torque. Just something to shoot for while wrenching on the scooter,,,, Just to make us feel better the Savage compared Royal Enfield Bullet 500 Bullet, 418lbs bike + 210 lbs rider=~630lbs stock power (27.2/30.4 ) 23.16 lbs per horsepower and 20.7 lbs per foot of torque Our little Savage would need "only" 26 hp and 28 ft lbs of torque (no spread sheets were used in the make of this post) |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Ruttly on 09/28/19 at 22:22:15 All your math doesn't mean dyck in the real world. While a sporty has more power it also has more weight and needs more brake to slow it. While the sporty might pull me at the end of a straight they are a handful in the corners and if your not drifting the sporty thru the turns you would never come close to to keeping pace with my tracker. On a tight country road ain't very many sportsters gonna leave me behind till the road straightens out and even fewer riders want or can ride a sportster on the edge.i know I own both. Thumpers rule the back roads. |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Ruttly on 09/28/19 at 22:55:19 Sorry Gary, Welcome to SS |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Gary RVA on 09/29/19 at 07:42:32 I am new to this board I am not new bikes or trucks... The " Numbers" are a away of trying to express what and why bike, truck, chainsaw performs or "feels" the way it does. There is a great deal more "data" out there. From gear ratios and power bands of the motor, flywheel wheel weight... But there is a limited to the interest a reader will have in a post. The post simply compared 3 common bikes to the Ls650 and in the most basic of terms, weight, horsepower, Torque The goal is to define what performance goals are and how they compair with similar bikes 8-) |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by LANCER on 09/29/19 at 09:06:17 The LS650 is a big single with 60’s & 70’s technology, so expect performance levels similar to singles of the 50’s 60’s and 70’s. This holds true for a stock or modified engine. I had a ‘56 BSA Goldstar 500 years ago; it was a purpose built racing bike, and produced in 45-50 hp range. If you want more torgue & power it is available for some work and $$. If you do the mods to the engine you should be in that ballpark. If you do so you should also upgrade the suspension and brakes as well; it is safer. |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Dave on 09/29/19 at 10:22:42 6469666B6D7A3A3F080 wrote:
It might seem like it was 500 years ago - but it likely was less than that! ;) |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Ruttly on 09/29/19 at 10:58:00 No he had it right ! ;D ;D ;D |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by philthymike on 09/29/19 at 11:13:58 My Thumpy eats stock Sportys for breakfast on the backroads. But the problem with 80+ mph riding for this bike is safely slowing it. The OEM brakes are mostly ineffective at those speeds. And upgrade options are few and far between with the majority requiring fabrications. IMO you're better of starting with a bike that already has the braking and suspension performance in place already. |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Armen on 09/29/19 at 13:48:02 Philthy, Have you seen the brake upgrade kit with the R6 caliper and larger rotor offered on the list a while ago? Put one on mine :-) |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by BrokeAss on 09/29/19 at 14:02:57 Braided stainless line, synthetic DOT4, and sintered pads...this bike weighs 350lbs properly bobbed/lightened, no need to perform unintentional stoppies... |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Ruttly on 09/29/19 at 14:44:10 Yeah the big brake upgrade is a must. Two fingers effortlessly stops me , I rarely use the rear brake now. At 315 lb it makes a dramatic difference , not to mention I have lost close to 30 lbs myself. |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Serowbot on 09/29/19 at 15:45:04 You might be interested in playing around with this... https://www.gearingcommander.com/ Select Suzuki LS 650 Stock numbers are already there. |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by philthymike on 09/29/19 at 16:39:42 754659515A340 wrote:
I never saw it. Too far into my current brake upgrade project to go another direction at this point. How do you like it? |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Gary_in_NJ on 09/29/19 at 20:02:18 Check out the big brake kit on my bike.. it’s a thing of beauty and works like a modern performance brake should. https://www.facebook.com/rycamotors/photos/a.391639964189140/1617099358309855?type=3&sfns=mo |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by Armen on 09/30/19 at 06:35:14 Gary, If the belt setup is in good shape, just swap the front pulley for one of the modified Kawi ones with 2 more teeth. |
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Title: Re: 40 hp/40lbs torque verse 50/50 Post by LANCER on 09/30/19 at 10:56:27 18232E3928243F39222A27384B0 wrote:
It might seem like it was 500 years ago - but it likely was less than that! ;)[/quote] Yes, it was a bit less than 500 years to my best recollection. Maybe “500cc” would be more helpful ? |
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