jharader Posted September 22, 2008 Report Posted September 22, 2008 (edited) Going through a motor for a friend and ran into these, it has (1.00) stamped on the top, i dont have my bore gauges to check them (at work) ill mic the plate tommorow looks like .015 to .020, doesnt look like a wiseco to me what is it and why is this spacer on the bottom of the jugs? the jugs are stock no porting with a factory head that hasnt been shaved. vitos maybe? rod is stock length as well. tell me what ya think Edited September 22, 2008 by jharader Quote
Misssppelllleddd Posted September 22, 2008 Report Posted September 22, 2008 If there is a spacer at the bottom then most likely (like 99%) you have a stroker crank. I dunno why you would have a spacer plate without one unless the deck and/or base has been modified. Probably a +4mil. 1.00 usually means that your pistons are for a bore of 1mm over stock. As for the pistons. They look like Wiseco 795 series pistons. Those pistons are used on +4mil cranks. Quote
jharader Posted September 22, 2008 Author Report Posted September 22, 2008 i dont think its a stroker motor, appears factory to me. the spacer would be more then likely 2 mill or more right? its not that thick ill mic it and get back with better info. thanks Quote
RZBansheeMan Posted September 22, 2008 Report Posted September 22, 2008 If I had to shoot in the dark with this one, and you say it's a stock stroke. I would have to guess that maybe the crank has been replaced with a long rod crank and pistons for the short rod crank were used. This would put them out the top of the cylinder thus requiring a spacer plate at the bottom. Quote
trex banshee Posted September 22, 2008 Report Posted September 22, 2008 looks like to me its vitos parts....that spacer is for the added stroke and yes the crank will look relatively stock, they run stock rods on them, yours are according to the numbers on the rod. Quote
trex banshee Posted September 22, 2008 Report Posted September 22, 2008 If I had to shoot in the dark with this one, and you say it's a stock stroke. I would have to guess that maybe the crank has been replaced with a long rod crank and pistons for the short rod crank were used. This would put them out the top of the cylinder thus requiring a spacer plate at the bottom. that doesn't make sense, not trying to be a dick but if what you say is true, and it is until your last sentence. stock stroke long rod (+5mm to be exact) ok so you buy the piston with the wristpin 5mm higher than stock this puts everything back to normal, no need for a spacer with just longer rods. stroke is not affected by adding to the rod. Quote
RZBansheeMan Posted September 22, 2008 Report Posted September 22, 2008 Yeah, I know what you're saying but if it were a long rod crank, it doesn't mean that whom ever put the motor together used the correct pistons for the longer rod. Just a thought. Quote
jbooker82 Posted September 22, 2008 Report Posted September 22, 2008 that doesn't make sense, not trying to be a dick but if what you say is true, and it is until your last sentence. stock stroke long rod (+5mm to be exact) ok so you buy the piston with the wristpin 5mm higher than stock this puts everything back to normal, no need for a spacer with just longer rods. stroke is not affected by adding to the rod. What he said was true and COULD HAPPEN. Long rod crank (5mm long con rod) with STANDARD not 795 series piston would cause the piston to come up 5mm out of the bore. Then put a 5mm spacer plate under the cylinders so the pistons dont pop 5 mm out of the bore. Is that what this guy has. Probably not. That isnt a 5 mm spacer plate. Nor is that a very good idea to build a motor with any way. it would jack the port timings way up. I would be looking for a 4 mill stroker crank. Quote
trex banshee Posted September 23, 2008 Report Posted September 23, 2008 Yeah, I know what you're saying but if it were a long rod crank, it doesn't mean that whom ever put the motor together used the correct pistons for the longer rod. Just a thought. yeah i hear ya now, i kinda missread your post when you said that would put the piston out the top of the cylinder, i thought you said it would put the piston at the top of the cylinder thats why i said it didn't make sense. but yeah like booker said not very likely someone is gonna put a 5mm spacer under the cylinders. my vote is still on the vitos 4mm stroker stock rods Quote
jbooker82 Posted September 23, 2008 Report Posted September 23, 2008 my vote is still on the vitos 4mm stroker stock rods That is what I would say too. Maybe there crank went bad so they threw in a 4 mill and never bothered to have it ported. Quote
jharader Posted September 23, 2008 Author Report Posted September 23, 2008 Well i suppose its getting split open and a crank swap since i dont have a positive answer on this and dont feel like guess work with pistons and a shim, if in doubt rip it out lol thanks guys Quote
desertdeweller Posted September 23, 2008 Report Posted September 23, 2008 with the shim only being .015 to .020 thats roughly .39mm. maybe the cylinders were overheated and they had the jugs milled. They could have then used the plate to make up the difference. So you may need to replace the cylinders in order restore the propper height. Quote
gregrob Posted September 25, 2008 Report Posted September 25, 2008 they look like 795 pistons. Probably put that spacer in there as a cheap way to lower the compression. I always lmao when I see people say the "long rod" increases displacement, or otherwise changes ANYTHING other than the rod angle. The stroke is determined by the crank, not the rods. If you put a +5mm long rod, stock stroke crank in a stock bike, with stock bore size how exactly do you have more than 350cc's? Just exactly WTH is a 370 long rod anyway? sorry for the derail Quote
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