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Author Topic: racing hot saw trouble  (Read 786 times)

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Offline uconnsaw

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racing hot saw trouble
« on: January 24, 2013, 12:57:19 pm »
Hello,  I've always been a fan of the modified chainsaws or hot saws.  So when I was looking at one I noticed they run a longer spark plug and a two piece cylinder.  Can someone maybe explain why this is done?  Thanks
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Offline Cut4fun

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Re: racing hot saw trouble
« Reply #1 on: January 24, 2013, 01:14:23 pm »
I always just ran Bosch 5E in everything Cliff Helsel 3120 Hotsaw, Dave Neiger 084 Hotsaw.  Now my MVP166 Marcel Vincent Hotsaw came with longer plug but I changed it to the cooler plug I liked.

Might just be old school thinking, I havent a clue.

I know they have went to the even shorter newer plugs found in chainsaws now days.  ;)
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Offline Cut4fun

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Re: racing hot saw trouble
« Reply #2 on: January 24, 2013, 01:16:57 pm »
Just my guesses on 2 piece head for changing combustion chamber size and or locations. Plus compression. Side benefit is ease of porting.
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Offline Cut4fun

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Re: racing hot saw trouble
« Reply #3 on: January 24, 2013, 01:19:19 pm »

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Offline Cut4fun

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Re: racing hot saw trouble
« Reply #4 on: January 24, 2013, 01:22:04 pm »
You can see the long plug in this MVP166 (20 year old racesaw when I got it). When I got it I put the shorter Bosch 5E in.



Shorter plug in

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Offline Al Smith

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Re: racing hot saw trouble
« Reply #5 on: January 25, 2013, 04:59:54 am »
Conventional thinking is that by placing the source of igntion directing in the center of the cylinder theoretically in the highest portion of the compression is the best place for it .For example most modern automobile engines use this method which actually goes back decades .
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Offline uconnsaw

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Re: racing hot saw trouble
« Reply #6 on: February 01, 2013, 09:23:36 am »
Thank You for your help guys.  its was very good.  Mabe I'll have to get into the hot saw game.
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