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High Horsepower Custom 88cc Engine

This is a discussion on High Horsepower Custom 88cc Engine within the CRF50 forums, part of the General Talk category; post some pics of the head work???...

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  1. #61
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    Re: High Horsepower Custom 88cc Engine

    post some pics of the head work???


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    Re: High Horsepower Custom 88cc Engine

    and thennnnn ?

  3. #63
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    Re: High Horsepower Custom 88cc Engine

    No and then!

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    Re: High Horsepower Custom 88cc Engine

    an dennn lol

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    Re: High Horsepower Custom 88cc Engine

    is this going to use the stock head and large valves? if so, do you plan on raising the port floor? i've always wondered how they do it.



    NO AND DEN

  6. #66
    cyclerider57
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    Re: High Horsepower Custom 88cc Engine

    I have a stock head I'm doing on a 50cc build with 23/19 valves but this will be a superhead. I'll have to give updates at another time. I've been all over the country again lately. I just got back from the US Open in Vegas and I leave tonight for Hawaii.

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    Re: High Horsepower Custom 88cc Engine

    An dennn!!!!

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    Re: High Horsepower Custom 88cc Engine

    Mmm billet aluminum!

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    Re: High Horsepower Custom 88cc Engine

    Quote Originally Posted by cyclerider57
    I have a stock head I'm doing on a 50cc build with 23/19 valves but this will be a superhead. I'll have to give updates at another time. I've been all over the country again lately. I just got back from the US Open in Vegas and I leave tonight for Hawaii.


    See if you can rent or borrow a street legal mini and go for a short cruise and take some pics or video of the cruise, in hawaii ofcourse

  10. #70
    cyclerider57
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    Re: High Horsepower Custom 88cc Engine

    This weekend I plan to test the rev limiter setup that will end up on this build.

  11. #71
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    Re: High Horsepower Custom 88cc Engine

    Quote Originally Posted by 50rider340
    post some pics of the head work???


    Very old picture of the head work in progress. As you can tell it was blown up when I got it. Had to weld up a few spots before installing the new seats for the rather large valves. Finished, the combustion chamber doesn't have any of the boogers on it which are shown in the picture. It had to be reshaped anyway for this setup. 32/26 titanium valves. Ampco45 seats.




  12. #72
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    Re: High Horsepower Custom 88cc Engine

    huge valves!!!

    is there an optimum valve size that relates to the cc?

    what would be optimum for 50cc?

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    Re: High Horsepower Custom 88cc Engine

    Quote Originally Posted by cyclerider57
    Very old picture of the head work in progress. As you can tell it was blown up when I got it. Had to weld up a few spots before installing the new seats for the rather large valves. Finished, the combustion chamber doesn't have any of the boogers on it which are shown in the picture. It had to be reshaped anyway for this setup. 32/26 titanium valves. Ampco45 seats.







    Where would you suggest to get valves for a takegawa super head? The valves that they come with just dont last. I have a old honda style head the ones with the 25mm intake and 22mm exhaust and it has over 12,000 scoot miles on it. There is still barely any wear on the valves. One season on a takegawa head the intake vavle gest thinner and thinner.

    If my memory serves me correct they are 5mm stems old style F5 head with a 27.5mm intake vavle.



    BTW that is awesome squishing a 32mm intake valve in there great work.

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    Re: High Horsepower Custom 88cc Engine

    Looks like you might need to shim the plug to keep the valves from fouling on it?

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    Re: High Horsepower Custom 88cc Engine

    I read all of this, but now I need MORE TECH! I like the look of the minis, but I want ridiculous tech, and this seems to be it. Awesome stuff.

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    Re: High Horsepower Custom 88cc Engine

    any news on this?

  17. #77
    cyclerider57
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    Re: High Horsepower Custom 88cc Engine

    Quote Originally Posted by LongMooie
    huge valves!!!

    is there an optimum valve size that relates to the cc?

    what would be optimum for 50cc?




    Optimum is a relative word. There are a lot of things that come into effect when choosing the major areas of an engine. You have to start with what you want it to do performance wise and the major characteristics you are looking for from it. Everything from that point is about making a happy engine. You can have huge valves, a really aggressive cam, huge carburetor, etc but it could easily run like crap. You have to match all the components of an engine build. Within valve size alone, there are many design theories. For example, a lot of formula one engines minimize exhaust valve size in order to increase intake valve size and breathing ability. This requires a cam/ exhaust system that is designed very well to insure exhaust gases are fully expelled so it doesn't replace incoming charge. Moto GP engines on the other hand, tend to have a little larger exhaust valves in comparison. This doesn't mean the ports are big though... the exhaust ports have quite a bit of funnel to them so even though the exhaust valves are larger in comparison the port size doesn't reflect it. Even within Moto GP there are many different design theories to what breathing capability you need and how to get there. I wouldn't be surprised if they are now favoring a little larger intakes with all the electronic control improvements in the last two years.



    As for 50cc, I have a stock crf head that I converted to 23/19 valves but for most other applications I would stick with sizes more closely related to stock.

  18. #78
    cyclerider57
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    Re: High Horsepower Custom 88cc Engine

    Quote Originally Posted by 50rider340
    Where would you suggest to get valves for a takegawa super head? The valves that they come with just dont last. I have a old honda style head the ones with the 25mm intake and 22mm exhaust and it has over 12,000 scoot miles on it. There is still barely any wear on the valves. One season on a takegawa head the intake vavle gest thinner and thinner.

    If my memory serves me correct they are 5mm stems old style F5 head with a 27.5mm intake vavle.



    BTW that is awesome squishing a 32mm intake valve in there great work.


    I use kibblewhite for a lot of my valve needs but they aren't cheap if you have them make valves. I just purchase valve blanks and make my own but they do make them as needed. Ferrea will make them for you as well. No matter what route you go, they will be custom valves made to order in either ti or st.

  19. #79
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    Re: High Horsepower Custom 88cc Engine

    Quote Originally Posted by Kurlon
    Looks like you might need to shim the plug to keep the valves from fouling on it?


    I shouldn't have issues once I index the plug where I want it. Keep in mind those valves aren't set in that picture. They sit a little lower in the head and with the rough combustion chamber in that picture, it makes things hard to compare.

  20. #80
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    Re: High Horsepower Custom 88cc Engine

    Quote Originally Posted by 50rider340
    any news on this?


    I've been doing a lot of ecu and clutch "thought and design" stuff lately rather than cutting and grinding so there isn't much "show" stuff. I am considering machining a "simple" ramp slipper clutch to match the high rpm pavement style of the engine.



    PS. adjustable rev limiter does work. Sounds like a big bike rev limiter too and not what people mistake for rev limiters out of their normal cdi setups.

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