lee37vernon
06-07-2006, 08:06 AM
having just rebuilt my engine i come to sorting out the squish . the cylinder is at 265cc having been ported , the cylinder has also been machined for o -rings , when on the engine the piston does not come over the top of the deck , its running an 86 style piston with spacer plate .
i bought this set up from a guy who had it as a spare and cant really give me much info on it .
i can fit the head on ( std honda ) and with no gasket other than the o rings my squish is around .055 to .060 '' around the edge getting to maybe .070'' towards the centre . i had to use plasticine to take these measurements as all solder i could find was too thick or too thin .
i know a squish ideally is around .035'' to overlap the cooling layers , so , should i ---
1) just have this head milled by .020'' ?
2) have the top of the cylinder decked by .020'' ?
3 ) something else i have not thought of !!
what should the squish height be also ?
also how much compression can i get away with running 99 octane fuel ( maybe 97 but most likely 99) ?
how can i work out , if the compression is too much , how much material to take from the dome ?
i bought this set up from a guy who had it as a spare and cant really give me much info on it .
i can fit the head on ( std honda ) and with no gasket other than the o rings my squish is around .055 to .060 '' around the edge getting to maybe .070'' towards the centre . i had to use plasticine to take these measurements as all solder i could find was too thick or too thin .
i know a squish ideally is around .035'' to overlap the cooling layers , so , should i ---
1) just have this head milled by .020'' ?
2) have the top of the cylinder decked by .020'' ?
3 ) something else i have not thought of !!
what should the squish height be also ?
also how much compression can i get away with running 99 octane fuel ( maybe 97 but most likely 99) ?
how can i work out , if the compression is too much , how much material to take from the dome ?