Where to buy +4 longrod

Was looking at these a while back. Found this.

Long rod just decreases the rod angle. Less stress and more efficent transfer of power from piston to crank. Doesn't change stroke. You'd need a spacer under the jug if you could find a compatable rod. Not worth the effort for an everyday motor. IMHO

agreed .............a longer rod wont make anymore power ,there will be slightly more dwell time and less angle for potential cylinder wear improvment but the extra mass thats thrown around will negate any power benefits and that mass can reduce the peak rpms of the little mill ....110mm stock is plenty long for that given stroke
 
yeah the +4 longrods arent bought, they are custom built, and apperently only endorsed by those builders who actually rebuild and repair crankshafts
it uses a 115mm banshee rod installed onto a +4 crank

as for the negating power qoute above, not all of us are looking for the most power at the trade off of "less cylinder wear" and reliability
most all modern 2 stroke engines are "square", meaning the bore closely matches the stroke, the stock blaster is far from this, the stroker crank/long rod helps get it closer to "square"
 
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yeah the +4 longrods arent bought, they are custom built, and apperently only endorsed by those builders who actually rebuild and repair crankshafts
it uses a 115mm banshee rod installed onto a +4 crank

as for the negating power qoute above, not all of us are looking for the most power at the trade off of "less cylinder wear" and reliability
most all modern 2 stroke engines are "square", meaning the bore closely matches the stroke, the stock blaster is far from this, the long rod helps get it closer to "square"

the rod isn't what brings it closer to square, it's the length of the stroke.


this is actually why older national MX motors used to use a smaller sleeve and longer stroke. to bring them closer to square while keeping it around the original 196cc
 
only long rod i care about is the one in my pants... hahaha I:I I:I but yeah what they say above is the truth of the matter
 
the rod isn't what brings it closer to square, it's the length of the stroke.


this is actually why older national MX motors used to use a smaller sleeve and longer stroke. to bring them closer to square while keeping it around the original 196cc

yes !!!!!
i knew it had sumthin to do with stroke/square
maybe i'll amend the above statement
 
yes !!!!!
i knew it had sumthin to do with stroke/square
maybe i'll amend the above statement



the longer rod does help with the side loading on the cylinder, and should help with long-term durability/reliability as well.

you were on the right track, just not quite there yet!
 
it's IMO the best setup, but it's not the cheapest option, you would have to get the cylinder reported, and a spacer plate built. plus the case trenching.
 
If you are interested in a long rod engine, you have to buy a brand new +4 stroker crank and then pay someone to press it off of the crank webs and then buy a new rod kit and pay that person to press it back together.

A long rod crank does have good torque characteristics and , as flotek said, favorable dwell time properties but it's kinda like the difference in power between going with a +4 stroker crank over a +3 stroker crank, negligible.....

+4 stroker long rod cranks are only for the highest level of competitors.... GNCC class racers, MX'ers, and maybe drag racers.... not warranted for hardly anything else (unless you happen to have a whole machine shop handy and just want to of course!)
 
I would send the whole thing off and just have it done up then. talk to the builder about what you're doing, then let them tell you what they think your best options will be
 
the longer rod does help with the side loading on the cylinder, and should help with long-term durability/reliability as well.

you were on the right track, just not quite there yet!

i didnt wanna give out all my secret info all at once, hahahaaaaa