Mick E Posted July 2, 2011 Report Posted July 2, 2011 have a5k in my ke-25 would like to know, what pistons might be in it.motor came out of a lite ace van has lugs or dimples under no 1 and 4 spark plugs, any help would be great thanks cheers mick Quote
sliesh Posted July 2, 2011 Report Posted July 2, 2011 have a5k in my ke-25 would like to know, what pistons might be in it.motor came out of a lite ace van has lugs or dimples under no 1 and 4 spark plugs, any help would be great thanks cheers mick dished pistons PM'D Quote
SLO-030 Posted July 2, 2011 Report Posted July 2, 2011 dished pistons PM'D don't want to add any more info to that? Quote
sliesh Posted July 2, 2011 Report Posted July 2, 2011 don't want to add any more info to that? lol we were both writing on here at the same time. i was just making a note that hey would have the 150mm push rods as a few people such as scott pmp020 his 5k had flat tops with the 156mm push rods' so if it was going to be modified to take note' Quote
SLO-030 Posted July 2, 2011 Report Posted July 2, 2011 lol we were both writing on here at the same time. i was just making a note that hey would have the 150mm push rods as a few people such as scott pmp020 his 5k had flat tops with the 156mm push rods' so if it was going to be modified to take note' There are 2 types of dished 5K pistons. Deep "D" dish of 22cc and a Shallow "O" dish of 6cc (commonly refered to as flat tops) Just a bit of clarification for anyone asking for dished pistons and not getting the right one. :) Quote
rockinrolla Posted July 27, 2011 Report Posted July 27, 2011 can you still run the 5k head with the 6cc pistons or not advisable, Just pondering another build and was curious :blinks: :blinks: :blinks: :blinks: :blinks: :blinks: :blinks: :blinks: :blinks: :blinks: Quote
basher_ke20 Posted August 13, 2011 Report Posted August 13, 2011 just to add to this, i got scott's 5k and it doesnt have flat top pistons, its running the dished d shape pistons that my other 5k i have has. the 5k i compared it to has the lugs on no 1 and 4, 150mm push rods, d pistons and a small amount of combustion space in the head. so this means that it is running the 22cc psitons and requires a small amount of space in the head for combustion. now the question, i also have a 4k but that has a large combustion chamber in the head. the 5k from scott had a large compession area in the head which had been shaved down to decrease the area. do i use a dished piston head from a 4k or will i have to use a d piston 5k head. i have been doing some searching and i think as long as i don't use a flat top 4k head (as that will increase my combustion chamber size too much) i will be ok? i thought i would just add to this thread instead of starting a new one. thanks chris Quote
altezzaclub Posted August 13, 2011 Report Posted August 13, 2011 Measure the volume to be sure, otherwise you're guessing on what has been done to the heads in the past. All you need is a bit of 2mm to 5mm clear plastic the size of a combustion chamber and a burette or pippette from a chemist or lab supplies. There's a photo about 3/4 way down this page. http://www.rollaclub.com/board/topic/42407-the-girls-ke70/page__p__445727__fromsearch__1#entry445727 I assume every size piston had its own head as the compression ratios were about the same from the factory. Quote
basher_ke20 Posted August 13, 2011 Report Posted August 13, 2011 yeah cheers i will measure the chambers but i just want a starting point to get a head that i can use. need to suss the whole motor out as it wont just be a "lets build it quick and cheap" job. do it once and do it right. thanks for the info. Quote
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