Honda CB350 (Ram Air Setup?)
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Honda CB350 (Ram Air Setup?)

This is a discussion on Honda CB350 (Ram Air Setup?) within the Project Builds forums, part of the Caferacer.net Forums category; Is there any way to stroke the engine with maybe a 450 crank or something for high compression and some more power?? Red...

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  1. #1
    Senior Member RondaDAHonda's Avatar
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    Honda CB350 (Ram Air Setup?)

    Is there any way to stroke the engine with maybe a 450 crank or something for high compression and some more power??

    Red

  2. #2
    Moderator imslow's Avatar
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    OMG
    Inertial dynos just make people cranky

  3. #3
    Moderator imslow's Avatar
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    OMG
    Inertial dynos just make people cranky

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  5. #4
    Senior Member craig641's Avatar
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    Red,

    Yes there is.

    Craig

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    Senior Member Judeyramone's Avatar
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    Are you sure strocking that engine is what you really want to do? Never heard of that, meself.
    Many a man who falls in love with a dimple makes the mistake of marrying the whole girl. - Evan Esar

  7. #6
    Senior Member ttilghman's Avatar
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    RondaD-

    listen to these guys. evil's a short strocker and craig's a long strocker...but they both have very high compression pistons.

  8. #7
    Senior Member RondaDAHonda's Avatar
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    Well im going to run 12.5:1 Pistons and bored out to 362.

    So Craig how did you do it?? And do u like it??
    What are the pros and cons too?

    Red

  9. #8
    Senior Member oldhondacafe's Avatar
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    What it involves is: welding the crank pin holes up then re-boreing them farther away from the crank center, I dont know how much stroke you could actualy gain. It depends on how much clearence is left for the crank/ rod to clear the case as it rotates. also if you increase the stroke very much you will have piston to valve/ head clearence issues. This would probably cost mega bucks and would also probably require re-ballanceing too. I seriously don't think it would justify the cost, which would be a lot! Put bigger pistons and cams and sutch, you'll gain more bang for those bucks. Also better ignition and exaust.
    \'78CB750f,\'76 cb500t,\'5-CB/CL450 basketcases,\'68 CL175,\'66 CA77/in a CL72 frame,\'1971 DT1f,1988cbr1000f,1987cbr1000f

  10. #9
    Senior Member craig641's Avatar
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    I just said it could be done. I didn't say I did it. I don't really see the need. It'd be illegal for any of the classes I race in. And if it's just for the street there are better bikes that would make more hp for less money than trying to do this with a CB350. As oldhonda said, this would be megabucks real quick for not enough gain to make it worth it.

    Craig

  11. #10
    Senior Member kenessex's Avatar
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    I think you guys are all a bunch of downers, trying to dampen any enthusiasm and creativity. I say go ahead and do it. Since the CB350 uses a built up crank, the way to do it has been done plenty of times. If I were going to do it with no regard to money, I would make up some new slightly bigger flywheels and move the crankpin out as far as I could. Then I would have Carillo make me up some shorter rods and Wiseco or JE make me up some shorter, bigger pistons. Then I would remachine the combustion chamber to match the bore and piston. Then I would port the head and put in some bigger titanium valves with smaller stems. I would top it all off with a hot cam and some giant flatslide carbs. That would make a really cool motor that would be close to 500cc and make almost 45 HP. I'll bet I could build that motor for under $5000.

    Of course I guess I could just buy a nice GS500 or EX500 for $1500 and have a lot better bike all around.
    Never mind, even if it can be done, there is absolutely no point in it. It is not worth the time money or aggravation.
    Of course that is just my opinion, and I might be wrong.

    Ken
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