piston
- Thread starter dre2992
- Start date
ok right now its at a .25 over i have 3 jugs so i want to go as big as i can for more power i have a fmf pip and idk if i need to jet if i go bigger im not jetted for the fmf i just got the pip and it blow
You will not even notice the difference in power from a 66 to 68 imo. I wouldn't bore the .25 over to a 68 that would be a waste of a good cyl. If you got a cyl close to the 68mm than do that one if you really want 68mm. Whoever you have do the boring/honing send the piston with the cyl so they can bore to the piston size. Also what do you mean by blowing up top end? Did skirt break or seizure?
Even at max bore, 68mm, vs stock 66mm, the power difference might not hardly be measureable. Even if you have a dozen cylinders, why would you want to take it to it's last life (bore) ??
skirt and yes im sending it to a shop to have it bored and will i need a new cyl if i go that big
Good chance that this^^^ is why it blew . ANY changes of air going in or out of engine at least requires a plug chop, more likely than not, rejetting.
ya i am my cace is split and i am getting crank bearings and i had a new crank i just need to know if its really bad to go 2.00 mm overIf you dropped a skirt you will need to inspect bottom end and clean it out.Chances are there are fragments of aluminum in there.
72mm is a big bore piston. you need a new sleeve to run that.
68mm is useless unless the current bore is so cut up that its needed
68mm is useless unless the current bore is so cut up that its needed
no its not bad i just found a new one for a good price look up pk1097 that is what im getting on amazon and i just looked up pk 1091 that is only .50 over .25 more thin i have it now
Not bad , just a waste of some good over bores imo.. Best way to go about this is to send the cylinder to your machinist and see what they say about how large it needs to be bored to. then either buy a piston from them or send the size piston they say it needs and they can bore it to the piston. To just jump up to a 68mm from a 66.25 is just a waste of $$..
http://www.kenoconnorracing.com/
http://www.kenoconnorracing.com/
I don't understand how it's a waste of money like I said I have 3 jugs and I can get a full top end ket for 117$ and it bored for 30$ and crank bearings for 50$ and it's all name brand so it's good stuff so that's were I'm lost lol
Its a waste of a good jug, for absolutely no power gain at all, I have a stock 66mm jug an stock stroke crank in my blaster, an its whips on vito's big bore engines, and vito's stroker engines, unless those engines were built by KOR or flotek, if the cylinder bore is in nice shape hone it an send it out to be ported, if it needs bored go to next size up that cleans cylinder up. Dont go to 68
This is my opinion but taking a 66mm piston and going to a 68 mm piston is wasting a good cylinder. After the 68mm you will have to get it sleeved . You might as well just bore it completely out and put a 72mm sleeve in it. Like I said man you are free to do as you please but I myself and I am sure quite a few others would be willing to trade you a 68mm cyl for your 66.25 cyl. That is unless it is gouged so bad it needs to be a 68mm. Also there are practically no gains of just boring to a 68mm "just because"..
Ok I'll just go .25 over cuz it needs it so it will be at 66.50mm
