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Thread: Show and tell.

  1. #31
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    Quote Originally Posted by SXV_Jack View Post
    @aaron9696024

    you made other pistons and cylinders in the engine but
    i think what is missing are titanium rods .... ?!

    what do you think about this ...
    I know of testing on 375hp 2.75L 4 Cylinder NA engines with titanium and steel rods.
    hp gain imperceptible. On track testing showed The lower connecting rod bearings looked better during rebuild.
    also titanium has a limited fatigue life and high risk of failure from small imperfections like tiny nick from handling.
    If one was going to try and rev a 550 to 13000 rpm CP-carillo does make rods.

  2. #32
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    stock is really really really bad
    front header too long but thats ok
    rear too short to be of any use, just loosing torque
    terminate in chamber muffler, thats all bad, even worse that it doesnt join in collector first.
    late RXV 550 exhaust looks better than original.

    Soon, soon,
    unfortunately no two dynos read the same.....
    and if you want to run on a real dyno, with an eddy current system or water brake, it will show much lower hp than the stupid dyno jet concrete drum inertia dynos.
    with the bored TB and port and chamber work it wont really be comparible...
    I would need a sil or arrow system to test.

  3. #33
    apriliaforum Junkie SXV_Jack's Avatar
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    i know one guy in italy he rebuilds sxv ... and has experience with titan rods.
    i think the most advantage is the lightwight ... better revving rotation speed
    and like you say less burdings for bearings etc .

    as it seems the sxv tends to worn bearings maybee titanrods can prevent this .

  4. #34
    apriliaforum Junkie SXV_Jack's Avatar
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    Quote Originally Posted by aaron9696024 View Post
    stock is really really really bad
    front header too long but thats ok
    rear too short to be of any use, just loosing torque
    terminate in chamber muffler, thats all bad...

    I would need a sil or arrow system to test.
    i think the sil and arrow racing exhaust is tested by manufacturer ...
    more than other of his kind.

    both looks for +/- equeal header lenght and have no chamber system ... only hole pipe in the silencer.

    arrow has two exhaust for the sxv ... underseat type and double type

  5. #35
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    look at akrapovic single
    front too long, starts tapering early, around the length of the rear header
    rear header shorter than the front as again, better to have 1 right and 1 wrong than two wongs, (people get so wrapped up on same..... staggered can be beneficial infact. people dont want to believe, but go ahead make them "same" engine will still ask for different fuel maps front and rear.)
    has a half assed collector
    then tapered secondary
    then perforated muffler

  6. #36
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    single arrow rxv looks best design actually.

    look these guys made them short as they could without resorting to extremely sharp bends. and then they tried a few different tube sizes and step locations, collector sizes and perforated tube size then arrived at the best from testing. Its that simple.. look at them theres no opportunity to make drastic changes in length other than longer. They had no way in the box muffler systems to add a secondary. Everyone wants it to be magic.... its more just working with the space and mounting you have.

  7. #37
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    the crankshaft would need to be re balanced with any significant change in rod weight.
    effects of the rod change would be somewhat similar to lighter flywheel.
    also, really believe me, Titanium rod life is limited.
    lighter flywheels show more power on fake dynos (inertia)
    don't make any change on steady state brake dyno.
    mainly effects low gear acceleration and free rev
    I don't have any desire to change the flywheel effect of my bike for what I use it for.
    in fact my mx bike has a 11oz heavier than stock flywheel
    one time i removed 8lbs from a speedway crankshaft
    Attachment 388410Click image for larger version. 

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    didn't do much good, the promoter screwed up the track composition. No traction that year.
    was hard to control when the track was bad.

    I think the way to improve bushing life is DLC wrist pins
    I think main bearing clearance may be excessive on many engines, at low rpm when oil is hot, I think mains may be getting all the oil.

  8. #38
    apriliaforum Junkie SXV_Jack's Avatar
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    also, really believe me, Titanium rod life is limited.

    limited lifetime ?
    whats happen than ... cracks or what shortens the life ?

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