possibly a dumb question (looking for extra bottom end)

[Vroomy]

What engine builders would you guys recommend? Should I send a cylinder to CT?


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[aberegg05]

I've been wanting to send a cylinder to neil @ c-leigh racing for a while now just haven't got around to it

[Jerry Hall]

hi guys ive had a real good ride on my stock 88 motor with CT pipe, vforce3 reeds, 36mm airstriker and no airbox. Loved it through the trails and dunes, revs real nice. Only thing im not happy with is the bottom end, would really like to increase the low end power for steep dunes and popping the front end up etc. Only thing i dont want to lose the rev ability so is this gonna be possible? also dont want to make it too thirsty either as we do quite long rides. Any advice would be great

Adding porting to the above components is going to move the RPM where it comes on the pipe to a higher RPM and add more power from that RPM and higher.  My testing has shown very little gain going from a 34mm carb to a 36mm.  The VForce reeds will help a ported motor with  large carbs in the 39mm to 41mm range.  I do not think that CT pipe is going to give you the bottom end you are looking for.  I would recommend the ESR TRX-5.  The ESRTRX 5 pipe is a good all around pipe if you can get a good one. If you get one make sure there are not any weld boogers in the inside of the pipe at the junction of the stinger and tail cone.

When you modify your engine to make more horsepower you have to feed the horses when you open the corral (throttle) and let them run.  It takes a certain amount of fuel to produce one horsepower.  If your engine was making 30 HP and you modify it so that it now makes 40 HP you have increased your power 25%.  Your fuel consumption will also have to increase at least 25% to feed the horses.

[Vroomy]

Which would be better between Curtis sparks MX and trx5? Also would bumping up comp work in my favour? Was considering a coolhead but not sure what dome would bump up comp and still run on 98 octane fuel


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[Jerry Hall]

Which would be better between Curtis sparks MX and trx5? Also would bumping up comp work in my favour? Was considering a coolhead but not sure what dome would bump up comp and still run on 98 octane fuel


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I have not dynoed a sparks mx pipe.  

There is a lot more to selecting a dome so that you can run 98 octane fuel than the ccs of the dome.  I can build two engines with identical heads and have different porting and different pipes and one engine may require 5 more octane points than the other.  A lot of testing has to be done and a couple of pistons may have to be sacrificed to find out what octane a particular build/compression ratio needs.  


A rule of thumb I have found in regards to octane requirements of an engine.


"The better you get you ports and pipe to work together the higher the fuels motored octane number needs to be".

Having a dome that has low compression does not guarantee that you engine can run on low octane fuel without detonation.

[Vroomy]

well im stumped as to what to do now...... theres no one in Australia that knows anything about these motors, and now i dont know where to start haha