THE RIDE Report fully worked vinsons, that wheelie!!
Oct 12, 2004 | 04:30 PM
#41
Thread Starter
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Pro Rider
Joined: Sep 2003
Posts: 2,261
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THE RIDE Report fully worked vinsons, that wheelie!!
i have run 87, and stock lifter, guys please pardon the videos, i am gonna send about 20+emails tomorrow with it, and then in a week or so my site should be up.
akracing.0catch.com
akracing.0catch.com
Oct 12, 2004 | 08:45 PM
#42
Trailblazer
Joined: Sep 2002
Posts: 100
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THE RIDE Report fully worked vinsons, that wheelie!!
Vinson 295,
A new cam will not increase your compression. It will however increase the duration the valves stay open and the distance they travel from the closed position to the open position. This all depends on the type of cam you have. It will increase horsepower with out a doubt but it won't increase compression.
A new cam will not increase your compression. It will however increase the duration the valves stay open and the distance they travel from the closed position to the open position. This all depends on the type of cam you have. It will increase horsepower with out a doubt but it won't increase compression.
Oct 12, 2004 | 11:19 PM
#44
Weekend Warrior
Joined: Mar 2004
Posts: 24
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THE RIDE Report fully worked vinsons, that wheelie!!
stuck,
I disagree, A new cam will increase the compression because it keeps the Intake valve open (duration) for more fuel to burn and keeps the ex valve closed longer than stock creating more combustion. the bigger the explosion the more force pushing down on the piston. oh by the way it is a web cam. i believe the lift is the same as stock only the duration is different.
I disagree, A new cam will increase the compression because it keeps the Intake valve open (duration) for more fuel to burn and keeps the ex valve closed longer than stock creating more combustion. the bigger the explosion the more force pushing down on the piston. oh by the way it is a web cam. i believe the lift is the same as stock only the duration is different.
Oct 13, 2004 | 10:11 PM
#45
Trailblazer
Joined: Sep 2002
Posts: 100
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THE RIDE Report fully worked vinsons, that wheelie!!
I disagree, the only way to increase compression is to decrease the size of the combustion chamber by either shaving the head or to install a bigger piston. In my opinion your explanation is right on as to how the cam works but you are not increasing the compression ratio. You are however increasing the engines HP by going to a bigger cam. When you buy a piston it has a compression ratio designation number like 10.0 to 1 or 9.5 to 1. A cam does not have this kind of number designation. I have been messing around with engines for better than 20 years so if I'm wrong please correct me!!
Oct 14, 2004 | 10:24 AM
#46
Weekend Warrior
Joined: Mar 2004
Posts: 24
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THE RIDE Report fully worked vinsons, that wheelie!!
You are 1/2 correct. its a very complicated process. as any engine builder knows there are two types of compression ratios: uncorrected and corrected. you are right if you are talking about the uncorrected version. that is straight forward: the volume above the piston at BDC and the volume above the piston and TDC. but this does not represent acutual running conditons. the corrected method is calculated at higher rpms where the piston moves so fast it "traps" extra Air/fuel and increases. The compression ratio and will increase with rpms as more fuel is trapped. as we all know a cam controls the air/fuel and exhaust so depending on the grind of the cam, it can trap more air/fuel allowing higher compression. other factors include the octane of fuel; higher octance will burn slower and cooler allowing more fuel in the combustion chamber which increases the compression. while your motor is running it will have different compression ratio's.
