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      CommentAuthorgphunt
    • CommentTimeDec 31st 2009
     
    Hey guys
    I am thinking of useing a TIM 6 ignition on a 13 HP honda engine. The question I have is what modifacations will it take to use it reliably on 12 volts insted of 6 volts?
    I plan to pot it in an aluminum finned case with the power transistor heetsinked to the case to prevent overheeting, and potted in with polyester resen like used for fiberglass to hopefully keep viberation from being a problem . My bigest conern is useing 12 volts. Will the componets handle 12 volts or will I need to change the transistors?
    Thanks!
    George Hunt
    • CommentAuthorgbritnell
    • CommentTimeJan 1st 2010
     
    S&S machine makes a 12 volt to 6 volt adapter. Here's their link.
    ->link<-
    gbritnell
    • CommentAuthordavid
    • CommentTimeJan 1st 2010
     
    George
    I would try it without the potting first. If it fails it will be the output transistor. And if that fails we can find a better one on a IGBT that will survive.
    If you are going to use a ballast resistor with the coil, the coil still actually only see 6 volts. I suspect it will work.
  1.  
    George;

    Be cautious about what you use to pott the electronics.
    Do a search on "electronic potting compounds". Potting materials selection for electronic components depends on whether the components are "surface mount" or pins thru the circuit board. Some resins etc can be too stiff or shrink with temperature changes. This stresses the surface mount components and can cause the soldered joints to fail.

    Garry
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      CommentAuthorgphunt
    • CommentTimeJan 1st 2010
     
    David
    I will do that. I can go back and pot it after I am pretty shure it is going to survive. The reason for potting it is that it is going to be on a modifyed engine with the balance shaft removed so there will be a bit more viberation than a stock engine pluss it will be turning around 6,000 rpm rather than 3,600 max.
    Just 30 min. ago I decided to use the stock mag. for now . I aquired another engine that had a valve stuck in it, but the bottom end is like new so I am going to put it togather with the ported head and roller rockers that I made for it and try to get the mini dunebuggy I am building finished. Then I will be able to have fun on the buggy while I am modifying the other engine for it!
    George Hunt
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      CommentAuthorgphunt
    • CommentTimeJan 3rd 2010
     
    Hey Garry
    I missed Your post till now sorry.
    I have used this resen for this before with good results! The first time I used it I decided on it because I knew it is strong,is a great insulator,and has good thermal qualitys.
    BTW there are no surface mount componits on the TIM 6 ignition circut board. The TIM 6 ignition that I used it on before is still in use on a raceing gokart engine, but is useing 5 AA nicad batteries for 6 volt power.
    I havent tryed this ignition on 12 volts but I would like to change at least the main power transistor to one with higher voltage & amprage rateings. This may not be required to run it on 12 volts but I would be more comfertable with it. If someone could sugest a sutible one it would be a big help!
    Thanks for everyones help!
    George