Greetings:
I seem to recall it wasn't all that high. 125 PSI maybe? Reed valves and carb bore (and failing to hold the throttle wide open) can affect apparent compression. Maybe muffler installed (or not) can too. If you go digging, my first Corsa was used but not worn, installed around 2010. I believe I posted a pic of the gauge showing compression value.
Spreedio Performance ... AF16 BUILD
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- Wheelman-111
- Moderator
- Posts: 11325
- Joined: Wed Oct 22, 2008 5:09 pm
- Location: Deepinnaharta, Texas
Re: Spreedio Performance ... AF16 BUILD
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
Re: Spreedio Performance ... AF16 BUILD
RATIO NOT PSI .
COMPRESSION RATIO
COMPRESSION RATIO
Re: Spreedio Performance ... AF16 BUILD
https://www.quora.com/What-is-the-compr ... -an-engine
http://chainganger.co.uk/Page2/PDF/CalcCR.pdf
http://www.csgnetwork.com/compcalc.html
http://chainganger.co.uk/Page2/PDF/CalcCR.pdf
http://www.csgnetwork.com/compcalc.html
Honda Elite SR
Honda Elite-Dio ZX
Dio ZX Headlight/Disc Brake Mod: http://hondaspree.net/phpBB3/viewtopic.php?t=30861
Honda Elite-Dio ZX
Dio ZX Headlight/Disc Brake Mod: http://hondaspree.net/phpBB3/viewtopic.php?t=30861
- Wheelman-111
- Moderator
- Posts: 11325
- Joined: Wed Oct 22, 2008 5:09 pm
- Location: Deepinnaharta, Texas
Re: Spreedio Performance ... AF16 BUILD
Greetings:
So, 125PSI divided by Standard Atmospheric Pressure, which is 14.7 results in 125/14.7 = 8.5:1. My measurements were obtained in Deepinaharta, which is very close to sea level. Temperature and altitude affect the gauge reading. If there are restrictions along the intake tract they will also affect the gauge reading. Remove the carb altogether if you want to be sure. If you use oil to measure the volume of the combustion chamber and you know the cylinder volume (3.1416 x 2.45 x 2.45 x 4.1) you can get a theoretical value for CR that way, but the Practical method is to read the gauge.
So, 125PSI divided by Standard Atmospheric Pressure, which is 14.7 results in 125/14.7 = 8.5:1. My measurements were obtained in Deepinaharta, which is very close to sea level. Temperature and altitude affect the gauge reading. If there are restrictions along the intake tract they will also affect the gauge reading. Remove the carb altogether if you want to be sure. If you use oil to measure the volume of the combustion chamber and you know the cylinder volume (3.1416 x 2.45 x 2.45 x 4.1) you can get a theoretical value for CR that way, but the Practical method is to read the gauge.
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
Re: Spreedio Performance ... AF16 BUILD
Thanks a bunch guys !
Victoria's Dark Spreecret.
Thanks to R1 i got all my goods on the low low. Decided to carry on the build he had done. I inspected the Contessa kit and after abusing it no damage was done to the the kit. Great quality i was surprised.
Further Porting the Corsa
And porting the case.
Victoria's Dark Spreecret
Further Porting the Corsa
And porting the case.
Victoria's Dark Spreecret
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