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Author Topic: How much compression is too much?  (Read 2946 times)

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Offline Snoopy

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Re: How much compression is too much?
« Reply #20 on: December 26, 2011, 10:44:20 pm »
I am thinking i am going to take some of that compression out to about 180-190
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Offline Troutfisher

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Re: How much compression is too much?
« Reply #21 on: December 26, 2011, 10:47:11 pm »
I know I really like to see threads like this, I'm not much of an engine builder, I need all the help I can get!!
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Offline Cut4fun .

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Re: How much compression is too much?
« Reply #22 on: December 27, 2011, 06:35:07 am »
TF that is understandable if you were porting the 046 for running on pipe.
That Dave Neiger built pump gas piped 084 didnt have any compression to speak of with it's stock cylinder head. De-comp was not needed.
It sure was a runner though on the PIPE, but on  muffler it was no more then stock saw. Had nice big finger ports in it too. 
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Offline EHP

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Re: How much compression is too much?
« Reply #23 on: December 27, 2011, 04:25:42 pm »
Like I said , it really depends on what motor your talking about cause some motors have higher porting to start with and it really depends on what fuel your running your saw on, the 2 transfer port motors run different than the 4 transfer ports motor to , crankcase pressure is different
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Offline Cut4fun .

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Re: How much compression is too much?
« Reply #24 on: December 27, 2011, 04:46:12 pm »
This was with a crap practice square  chain. The hand filed chain I bought for this saw flew through the cuts compared to this video.

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Offline Troutfisher

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Re: How much compression is too much?
« Reply #25 on: December 27, 2011, 04:56:37 pm »
That looks strong! have you ever had a compression guage on it? But, Like you said it's got a pipe......
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Offline Old Iron Logging

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Re: How much compression is too much?
« Reply #26 on: December 27, 2011, 05:26:21 pm »
The cyl came off of a 50 Husky. I will have to make a degree wheel and get some #'s.
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Offline Cut4fun .

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Re: How much compression is too much?
« Reply #27 on: December 27, 2011, 05:55:34 pm »
I'm pretty sure I did way back when Aric, but cant remember.   Put it this way it had the least psi of any saw I have ever pulled over stock to modified.

I'm going to combine the 2 threads guys.
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Offline man of stihl

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Re: How much compression is too much?
« Reply #28 on: December 27, 2011, 06:09:53 pm »
It seems i have a lot to learn yet. :-\ I always thought you wanted comp up around 220-240 for two piece heads and 200 for hot woods port saws.
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Ron

Offline Troutfisher

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Re: How much compression is too much?
« Reply #29 on: December 27, 2011, 06:22:28 pm »
You and me both, it seems the more I learn the less I know :-\
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