The Ascot 500 Forum > Welcome
Hi ! VT500 all over the world !
J6G1Z:
So if I understand you correctly, you have had the cylinders cut shorter to increase the compression.
Is your measurement 6mm or 0.6mm? Does this bring the piston to "zero" deck height?
Can the heads be cut instead of the cylinders?
How high is the octane rating of your pump gasoline?
Thank you
J.
Dibingo:
They're very good questions! :)
--- Quote from: John ---So if I understand you correctly, you have had the cylinders cut shorter to increase the compression.
--- End quote ---
yes ! ;D
--- Quote ---Is your measurement 6mm or 0.6mm?
--- End quote ---
Like I post it : 0,6mm ! 1mm works too, but the carrier strap of distribution loses there !
--- Quote ---Does this bring the piston to "zero" deck height?
--- End quote ---
No need other modifications ! There is room and no gap either.
--- Quote ---Can the heads be cut instead of the cylinders?
--- End quote ---
You can, but in lesser proportion.
Like I post, you can too :
--- Quote from: Dibingo ---On the VT5, we can content with tightening more hardly the breech or with abolishing the joint of embase. (The water is external)
--- End quote ---
--- Quote from: John ---How high is the octane rating of your pump gasoline?
--- End quote ---
Octane is SP95 or SP98. No jingle sounds !
J6G1Z:
I don't know how your local gasoline compares to ours. Sounds like yours may be better.
We are usually lucky to have "Premium" at 92 octane. Plus that has at least 10% Ethanol. There are a few filling stations where you can purchase Premium that does not have the Ethanol in it, but they are few & far between.
Thanks
J.
Dibingo:
In france : 95 and 98 octane.
But our 95 is with 5 or 10% Ethanol. And not our 98 !
I use 98, that changes necessarily things! :'(
scottly:
Removing .6mm from a 71mm bore cylinder would reduce the combustion chamber volume by 2.374cc. This would increase the stock compression ratio from 10.5:1 to maybe 11.5:1?
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