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03-01-2017, 06:35 PM | #1 |
Gone Wild
Join Date: Jul 2015
Posts: 180
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Compression vs horsepower
It's time to act on all the input you guys gave me and make some improvements. I am going to buy a new driven clutch because mine is worn out.....I expect this to provide a significant increase. In case it doesn't, I am prepared to rebuild the top half of the motor; if I go this route I also plan to bore it 25mm over.
I have 105 PSI cold and I understand that if I rebuild I will get something like 120-125 PSI. Does anyone know how compression and cylinder volume effect horsepower? |
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03-01-2017, 08:19 PM | #2 |
Not Yet Wild
Join Date: Jun 2014
Posts: 71
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Re: Compression vs horsepower
Should make more power. More room for a bigger explosion.
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03-01-2017, 08:51 PM | #3 |
Gone Wild
Join Date: Jul 2014
Posts: 349
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Re: Compression vs horsepower
Do you mean 25cc over?
What does it test out at when its hot? |
03-01-2017, 11:13 PM | #4 |
going,.. going,.. gone!
Join Date: Apr 2014
Location: Third Rock from the Sun...Vegas baby!
Posts: 1,422
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Re: Compression vs horsepower
In short, increasing the cylinder volume (by increasing the bore), will increase the combustion chamber volume. This in effect does 2 things. First, this increases the compression ratio and second, it increases overall engine displacement. In turn, this results in higher power output.
This becomes quite complex mathematically, but I suspect that the said change will be little, perhaps unnoticeable in this "small" motor in by itself. Adding such things as cams, greater fuel/air mixture, timing, etc. would enhance the use of a larger combustion chamber and therefore enhance power. |
03-01-2017, 11:23 PM | #5 |
Getting Wild
Join Date: May 2016
Posts: 122
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Re: Compression vs horsepower
Is this a 2 stroke or a 4 stroke? Your sig shows what I believe is a 2 stroke.. you can bore those up to .50mm over with a factory style piston. Anything over that would be custom. You can also bump compression by shaving the jug and head. There are a lot of things you can do to bump the performance of your motor.
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03-02-2017, 12:29 AM | #6 |
Gone Wild
Join Date: Jun 2015
Location: NW Iowa
Posts: 1,669
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Re: Compression vs horsepower
Beings compression is 105 and you expect 125 I'm going to assume this is a two stroke that being said on my single cylinder 215 CC stock two stroke Yamaha I bored it over 1.0 mm or roughly 4 thousands over witch on a v8 would be noticeable but don't expect any performance gain on a single cylinder two stroke... It takes fuel to make power and after a rebuild with largest oversized piston you don't have to rejet the carb to keep it from leaning out so if it doesn't require more fuel you won't make more power
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03-02-2017, 09:02 AM | #7 |
Crazy Ole Man
Join Date: Jan 2016
Location: Owego NY
Posts: 2,758
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Re: Compression vs horsepower
If you bored your cylinder to the max number -- the output horse would not be noticeable. What you would experience is the feel of a new engine. It wouldn't require rejetting the carburetor.
Here is the easiest example to explain -- in Nascar they all run the same size engine, 358 cibic inch small block GM I believe. It starts its life as a 350 and is bored to the max of .080. A bore job of .080 increases the displacement 1 inch per cylinder times 8 equals a 358 cubic inch engine. When you start with a cylinder of 43.75 cubic inches -- adding 1 cubic inch more doesn't really do much. So boring out your small engine -- to the max is only going to be a fresh engine in output. |
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