Liter motor dreaming...

masterblaster

masterblaster

X-H2
I fought this once before with diff length rods and stroke and got it right by recessing the domes,but with this setup as long as the rods were the same length I dont see how the port timing would be diff if the spacer compensated for precisely one half the length of the added stroke?
 
WaveDemon

WaveDemon

Not Dead - Notable Member
Location
Hell, Florida
lets say you add 10mm to the stroke so you add a 10mm spacer so the piston doesn't go through the head at the top of the stroke. when it's on the bottom of the stroke it'll be 10mm lower than stock so you piston will be way lower than the bottom of the exhaust port.
 
wsuwrhr

wsuwrhr

Purveyor of the Biggest Brapp
Location
Alta Loma, working in Upland
wavedemon said:
lets say you add 10mm to the stroke so you add a 10mm spacer so the piston doesn't go through the head at the top of the stroke. When it's on the bottom of the stroke it'll be 10mm lower than stock so you piston will be way lower than the bottom of the exhaust port.
Click to expand...


5MM spacer for a 10MM increase in stroke, actually. 1/2 up-1/2 down.

The rod length difference will come into play for the spacer thickness as well.
 
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masterblaster

masterblaster

X-H2
yes thats why i said a spacer one half the size of the stroke.

Tim as far as i know the spacer is balancing out the piston in the cylinder because its a 50 50 split. you can get stroker cranks with oem length rods.Id rather have one without a spacer but im just saying if you wanted to go up to a 1000 cc later you could
 
wsuwrhr

wsuwrhr

Purveyor of the Biggest Brapp
Location
Alta Loma, working in Upland
That isn't necessarily true. The spacer would only solve some of the problems with the port timing. Might have to cut some off the bottom, some off the top, some out of the dome, some off the piston, or it may not even be possible.

Better to either start off with the right parts the first time, or because of money, riding ability, or time, work up to a given horsepower gradually. Then later on sell off the old parts and move up from there, rather than have a cobbled together setup that doesn't use off-the-shelf pistons, cylinder, domes or sleeves.

We've even taken in good-used cylinders on trade for bigger setups and sold the cylinders to someone wanting the setup.

Brian




masterblaster said:
....but im just saying if you wanted to go up to a 1000 cc later you could
Click to expand...
 
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OCD Solutions

OCD Solutions

Original, Clean and Dependable Solutions
Location
Rentz, GA
You're on the edge of madness, all you need is a little bump in the right direction. :biggrin:








































:bump:

picture.php


XScream Inc.
1780 Calumet St.
Clearwater, Florida
33765

ph. (727) 442-7700
or e-mail. sales@xmetalworks.com

Ask for Patrick
 
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masterblaster

masterblaster

X-H2
wsuwrhr...I agree better to have the right cylin for the job either way,but for my own knowledge on other projects,what problems would a spacer 1/2 the length of the extra stroke added not solve if the rods where the same length on both cranks?
 
Aircraftsalz

Aircraftsalz

Thrust built Dasa Power
Location
Off site
I just looked at all these pages, Thanks Chris (Jetmanica) said I should put my .02 in. I spent the last 30 minutes reading 15 pages, LOL

I love my Xscream 865SS (846cc), I let Xscream build the motor & do the set up/install since I run avgas in my Ski's. My motor rips, Like Idok posted he has rode a few SS motors & you can tell who let the Xscream crew to the complete package.

Stock pump, TBM & 14/19 works fine, but for the surf the mag pump is the only way to go.

I sent them a set of very nice 62T cases & very clean used crank. Which was used for my build. I think one bearing on the crank was replaced. If you got nice cases I think your going to be fine.

My new motor I order is a XS1000, B pipe, MSD Enh, TBM, Dual 46's, Billet Setback mag 148. (TC surf package) Reason for me was the cost, its not that much more to build a 1000cc motor so why not.

Plus I'll have both motors to rip in my Rickters!
 
wsuwrhr

wsuwrhr

Purveyor of the Biggest Brapp
Location
Alta Loma, working in Upland
On paper, yes, should work.

But there are far too many combinations to give a blanket statement. I am not one to blow sunshine to make a sale, so I would rather err on the side of caution.

Brian

masterblaster said:
wsuwrhr...I agree better to have the right cylin for the job either way,but for my own knowledge on other projects,what problems would a spacer 1/2 the length of the extra stroke added not solve if the rods where the same length on both cranks?
Click to expand...
 
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