4mil Stroker

[brian]

I'm building a 4mil stroker motor.

I got a set of cylinders from a guy over at P/S (think i got FUCKED....no lube...dont feel good...)

They came with prolite pistons and were ported by Corey at LA cycle. The port work looks good. The guy I bought them from said they only had a few hours on them and it looks like that was true from what i can tell.

 

Problem is that he was storing them in his laundry room, and someons got some liquid detergent on them and the pistons.

I got some wd-40 and some scotch brite and scrubbed off the detergent and found that the shit corroded a couple spots on the top of the pistons, and corroded a few rather large spots in the cylinder walls.

Looks like the cylinder walls will need to be honed a little (porbably take another .003-.004 out of size to cleanup the walls).

That will make the piston fit too loose.

 

How much bigger can I safely go. I think I remember a guy tellin me not to go that much past .06 over with a 4mil setup. These are already 66mm (.080 over) bored.

 

? ? ? ? ? :shrug:

[blowit]

I'm building a 4mil stroker motor.

I got a set of cylinders from a guy over at P/S (think i got FUCKED....no lube...dont feel good...)

They came with prolite pistons and were ported by Corey at LA cycle. The port work looks good. The guy I bought them from said they only had a few hours on them and it looks like that was true from what i can tell.

 

Problem is that he was storing them in his laundry room, and someons got some liquid detergent on them and the pistons.

I got some wd-40 and some scotch brite and scrubbed off the detergent and found that the shit corroded a couple spots on the top of the pistons, and corroded a few rather large spots in the cylinder walls.

Looks like the cylinder walls will need to be honed a little (porbably take another .003-.004 out of size to cleanup the walls).

That will make the piston fit too loose.

 

How much bigger can I safely go. I think I remember a guy tellin me not to go that much past .06 over with a 4mil setup. These are already 66mm (.080 over) bored.

 

? ? ? ? ? :shrug:

 

 

We never recommend going over 2mm over but do what you have too. If your corrosion is not in a bad area, you might be able to run with it. If you want to post pics of the questionable spots, I can help you with that. Pretty much, if it is above the top of the exhaust port, you are screwed though. I would bore to 66.25mm and run it and check the top end frequently for wear.

 

 

Brandon

[brian]

Yeah I figured I might get away with it when I was cleaning out the first cylinder.

On the second one though, there is about a nickel sized spot right at the top.

There already seems to be about a .003 piston/cylinder fit. I dont see any way out.

Hone up to nect size, Spend more money on pistons, etc...................

[dajogejr]

If it were me, I'd ask the guy you bought them from to pay for shipping of the pistons you bought back to him...and he should send you the ones you'll need due to the rust/corrosion.

If they were advertised bolt on, and they showed up all corroded and needing work...that's not your fault.

 

Before you spent your money...I"d see if that guy will work with you.

 

Sorry to hear man...too bad.

 

You can go 80 over on a stroker, what you probably read is it's not a good idea to put a sleeve in and run a stroker, it takes away from the transfer ports ability to flow as much...where most of your power can be had....

[brian]

Already .080 over. Is .090 ok ?

 

Yeah, the price was pretty good so I asked him why he was selling them, and if the cylinders were actually ported for a 4mil setup or if he was using a base spacer. This was the reply.....

 

"Yes they were ported for a 4 mil stroker crank and no I didnt have to use a base spacer . The porting is Drag/Play port the next and most aggressive was the full drag race port so it is one level from full drag race port specs. I ran these on 35mm Keihin Carbs on c12 race fuel once I got the jetting dialed in the motor ran very strong and hard . It was a very big step up from stock . I only ran the setup about 2 tanks of gas and decided to try out the cheetah cub cylinders that is why I am selling these . You can have the package for $ 350 shipped . Thanks"

 

So I assumed that this was a bolt on setup.

Edited October 1, 2007 by brian

[dajogejr]

Honestly, send it back and get your money back....

 

Not because you can't make it work...but because he neglected the motor and sold it to you...that's not your fault and beyond your control.

 

if he stated anything wrong with them (need a bore, need pistons, nikasil is shot i.e. cub cylinder, etc.) then you'd be stuck with what you got. I'd ask for your money back...see what he says...