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/cgi-bin/YaBB.pl General Category >> The Cafe >> Savage tuning read /cgi-bin/YaBB.pl?num=1396911102 Message started by Michael L on 04/07/14 at 15:51:42 |
Title: Savage tuning read Post by Michael L on 04/07/14 at 15:51:42 Hey guys and girls Came accross a forum post with some interesting info.. It seems that the guy knows what he's talking about.. If you prefer the link, here it is: http://newsgroups.derkeiler.com/Archive/Rec/rec.motorcycles/2007-06/msg02060.html ------------------------------------------------------------------- Sean wrote: The single cyl Suzuki Boulevard S40 (aka Savage LS650) is rated at 30 HP at 3000 rpm: http://www.totalmotorcycle.com/photos/2002models/2002models-Suzuki-LS650Savage.htm Isn't 30hp low for a 650? Cruiser riders like the mild mannered Savage, and its low gearing allows it to out-accelerate an 883 Sportster up to 50 mph. But, you got the peak power RPM wrong, it's 5400 RPM, not 3000 RPM as you wrote. Horsepower production is based upon increasing the peak RPM the engine turns, if volumetric efficiency (cylinder filling) does not improve. Simplistically, if you want to extract 60 horsepower from the Savage engine, all you have to do is double the engine RPM to 10800 RPM. But, who ever heard of twisting a big single up that high? My counterbalanced short stroke KLR600 will rev up to around 8000 RPM, but piston rocking of the 100mm piston causes it to use a quart of oil every 500 miles. The Savage is counterbalanced too, but it's a square engine (i.e., the bore and stroke are the same). Bore and Stroke: 94.0 mm x 94.0 mm (3.7 in X 3.7 in) Power and torque output: 30 hp @ 5400 rpm, 33.5 foot pounds @3400 rpm. Horsepower = Torque X RPM divided by 5252. If the engine still makes 33.5 foot pounds of torque at 5400 RPM, it makes 34.4 horsepower. Piston speed at 5400 rpm = 0.166 X 3.7 X 5400 = 3317 feet per minute It would probably be safe to operate the Savage engine at 7400 RPM where it would produce 47 horsepower. The piston speed would be 4545 feet per minute. This would be a relatively safe piston speed to avoid ring flutter, but the mechanical stress on the moving parts would almost double. Stress = ( 7400/5400 ) squared = 1.88 There is probably somebody out there in AMA Short Track land who loves Savage engines and has a high compression, re-cammed Savage engine in a custom flat track frame. I don't think a cruiser rider would want to go so far, but 47 horsepower in a 350 pound cruiser sounds like it's quite adequate. It would be loud, with a megaphone exhaust and open air intake and re-jetted carburetor and the rider would have to keep the engine in the right gear all the time. Finding different pulleys and a longer drive belt to re-gear a souped up Savage might be difficult. This is how you can experimentally determine how the horsepower delivery of the Savage engine would feel, without buying an aftermarket camshaft. http://www.bikebandit.com/partsbandit/showschematic.asp?dept_id=2412069 Turnthe engine to TDC on the compression stroke. Remove the camshaft. Slot the bolt holes in item #2 sprocket, reinstall the sprocket and cams with the bolts loose and rotate the crankshaft about 5 or 6 degrees without allowing the camshaft to turn. Then apply Loctite to the bolts one at a time and tighten them. This camshaft degreeing will retard the power peak until a higher RPM and increase peak power at the expense of low end torque. Actually the best cheap change is move the clip to three, drill out a brass plug and adjust the low end needle. 8^) Slap on a suppertrapp exhaust (wish there was a better header) don't forget the turbo (it's been done and works well) ditch the belt and us the gears off a GS750. Bigger carbs can be done but the mileage goes somewhere south of BAD. Best change is to get a bigger fuel tank, 108 miles and you either coast into a gas station or start walking. I had one, I blew it up...I need a motor. -- Keith Schiffner Assistant to the Assistant Undersecretary of the Ministry of Silly Walks. "terrorist organization" is a redundancy --------------------------------------------------------------- |
Title: Re: Savage tuning read Post by justin_o_guy2 on 04/07/14 at 22:00:51 I had one, I blew it up...I need a motor. Interesting read, but I rarely take Hop Up ideas from someone whose last words on the subject indicate a fatality. |
Title: Re: Savage tuning read Post by verslagen1 on 04/07/14 at 22:46:41 You live on the edge all it takes is 1 mistake... making mistakes is how you learn. Of course... it's cheaper to learn by someone else's mistake. So, we're learning... right? Almost, he didn't say what blew it. |
Title: Re: Savage tuning read Post by Serowbot on 04/07/14 at 23:50:24 I have enough expertise to blow an engine... ... and that ain't a lot... :-?... I have enough experience to know that I can... ;D... ... and that is a lot... :-?... |
Title: Re: Savage tuning read Post by ToesNose on 04/09/14 at 04:45:50 Yea I guess I'll leave the blowing up of engines to the professionals :D |
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