Lamey Cylinder Bore Size vs. CC's and other questions

[Kirv]

I'm running a stock stroke dasa / lamey 771 cc, 185 psi (running 93 octane). about 30 tanks of gas through it since i got this motor brand new in july.

i might want to go up a bore size over the winter, partly to keep the top end fresh for next year, and partly hoping for more power.

what is involved, such as will it throw my compression off so that i need different domes etc?

what is the cost for boring, pistons, etc...?

also, what size pistons are the next ones up from "stock" (85 mm stock) for the lamey and how many cc's would the motor be after the first bore?

finally, is there a noticeable power gain from this?

hoping someone out there done this already and can answer these questions.

thanks for any input
mark

 

[Roo]

What is the max bore on the cylinder you are running? If you are only planning on doing one bore up, save your money...

If it's not broke, don't fix it! You are using a stock crank. Not like a stroker crank that needs freshening up because of the radical rod angles, stress on bearing, etc. Your motor is not stressed enough to need a freshening up after a season.

bore * bore * stroke * .7854 * 2 / 1000 = Engine Displacement (CC)

currently, you are: 85mm * 85mm * 68mm * .7854 * 2 / 1000 = 771CC

going up one full bore: 86mm * 86mm * 68mm * .7854 * 2 / 1000 = 789CC

Not a big increase... move up to 89mm bore if possible, well maybe

 

[wsuwrhr]

Mark,

Yep. More or less.

Keep tabs on compression. If it stays where it is set up at, no need to do anything. Keep running the piss out of it.

Otherwise, to answer your question, you have two ADDITIONAL bores left. 85-85.5-86.

Then it is re-sleeve time and start over.

I believe it is $100 to bore and hone, plus the cost of pistons. Which I think they are $200. each.

So the total job is around $500.

Not worth it unless your compression is down.

It will raise the compression slightly, not alot, you can run it the way it is, your domes can be trimmed slightly, or you can buy new domes and you can save the ones you have for the next time you need them.

Choices are endless.

Shoot a call to the shop and talk to Kyle, or you east-coasters can call up Steve at Watercraft Factory, or any of our other local dealers for service.

Brian

What is the max bore on the cylinder you are running? If you are only planning on doing one bore up, save your money...

If it's not broke, don't fix it! You are using a stock crank. Not like a stroker crank that needs freshening up because of the radical rod angles, stress on bearing, etc. Your motor is not stressed enough to need a freshening up after a season.

bore * bore * stroke * .7854 * 2 / 1000 = Engine Displacement (CC)

currently, you are: 85mm * 85mm * 68mm * .7854 * 2 / 1000 = 771CC

going up one full bore: 86mm * 86mm * 68mm * .7854 * 2 / 1000 = 789CC

Not a big increase... move up to 89mm bore if possible, well maybe

 

[SUPERTUNE]

Mark,
Buy Andrews (ROO) SS 865 (845cc) engine complete and your done at a WAY cheaper price to build the same package!
P.S. I sent you a PM.

 

[wsuwrhr]

Mark,

Nice.

 

[Kirv]

thanks everyone, exactly the info i was looking for. i'll just keep tabs on compression for now.

i really like the turnkey lamey setup that watercraft factory / novi-tec put together for me, i've been riding EVERY weekend for the whole summer, this thing is reliable and powerful.
...but i'd like to try the team scream power too. i wish someone up in the NE had one i can try...