Port & Polish Cyl. and Crankcase

[bebeav]

anyone here ever heard of crankcase port and polish???

i wanna get some detail about this kind of p&p. i heard they was mostly done on kart engine.

what kind of gain i could expect from both cylinder and cranckcase p&p on my 84r.

any help would be really nice.

ALP
Beav

[ridetrikes250R]

the cylinder will be the most noticed gain, the case is just for better lube really, nothn like more case pressure thats case stufferes, so i say just port ur cylinder not ur cases, only do the cases if ur going above 230 psi for longivity wize.
adam

[03 ORANGE SHEE]

if you port the transfer ports, you should ALWAYS port the cases to match the cylinder, otherwise that air/fuel will hit the casting lip on the cylinder, most places charge $40 for this, be sure to trim the base gasket to match as well

[Rex Karz]

The cases and cylinder ports all work together. To learn more about 2-stroke applications I would recommend www.macdizzy.com

As to "polishing", the pros now intentionally make the ports with a rough surface. Think golf balls and you will realise why.

[my90rulz]

Originally posted by 03 ORANGE SHEE
if you port the transfer ports, you should ALWAYS port the cases to match the cylinder, otherwise that air/fuel will hit the casting lip on the cylinder, most places charge $40 for this, be sure to trim the base gasket to match as well i had the transfer ports on the tri-z cleaned up some, nothing radical....do i need to port the cases?

[thefox]

Originally posted by Rex Karz


As to "polishing", the pros now intentionally make the ports with a rough surface. Think golf balls and you will realise why.

I have heard that it is best to rough up the intake and polish the exhaust so now I am all confused:shrug: .

[my90rulz]

Originally posted by thefox


I have heard that it is best to rough up the intake and polish the exhaust so now I am all confused:shrug: . well i can see the point on ruffing up the intake, to better mix the fule becuse of more uhh whats the word.....disturbance? kinda like when you shake water and coolaid mix up, it mixes toghther better than just puttin coolaid in it......get it? :) mine still has stock little casting in it cept around the boost ports

[NOS_350X]

Originally posted by my90rulz
well i can see the point on ruffing up the intake, to better mix the fule becuse of more uhh whats the word.....disturbance? kinda like when you shake water and coolaid mix up, it mixes toghther better than just puttin coolaid in it......get it? :) mine still has stock little casting in it cept around the boost ports

Thats what hes saying, the intake you dont smooth out (polish). instead you leave it rough so it swirls the air, mixing it better with the gas, giving it a more consistant mixture.

[my90rulz]

Originally posted by NOS_350X


Thats what hes saying, the intake you dont smooth out (polish). instead you leave it rough so it swirls the air, mixing it better with the gas, giving it a more consistant mixture. yea thats what i ment....., i seen an artical somwhere about a guy who use's a dremel to make ridegs and stuff in the head's of motors, and theyh ave a more compleat burn produce more horsepower, run cooler, less emmsions and stuff.....found it kinda intresting

[bebeav]

i was asking this cause i can get the crankcase p&p also and i wanted to know if it would be usefull enough. like ridetrikes250R said i may not need it for 230 but i'm going for 210psi approxx. so it may be usefull. thx for all the input guy i really appreciate.

btw the p&p will be done by one of my friend who did and still do p&p on Kart. he only charge me 100-120$ can for the whole thing and matching the gasket also. i think it's approxx. 80-95$us

ALP
Beav

[350xsx]

you think the difference would be worth the money to get it done on my 350x?i know the iits def. worth it on a 2 stroke in my mind, but i havent had experience with i done on a 4stroke....