Join Date: Apr 2011
Location: Might as well be the moon
SDHQ Rhino get a double lung transplant
After bending all the valves in my 760 Weller Rhino motor (twice) at KOH I decided to start over. Now that BITD, KOH and several other race series have opened up the rules to motor swaps I am going with a Rotax.
New motor plans are in the works.
I found a Can-am 800 motor core out of an '07 Renegade quad. It had about 500 miles on it and spun a rod bearing. It's a common problem if they ingest some water or dirt. I got it cheap and it's an easy fix.
Next I found the tranny out of an '07 650 Outlander quad. The 650 has a lower high gear and the same low gear as the 800 and the new 1000. The lower high gear is only about 3-5 mph slower in the flat out speeds but should give me a little better pull out the hole in the tight tree racing and KOH style crawling.
Now its time to turn it all up a little. The stock Rhino motor is 23 hp. My Weller race motor was 54 hp. I am shooting for 95-100 with the Rotax.
This is how I am getting it done.
STM stage 8 clutches, primary and secondary
Tune Monster ECM with fuel, spark, fan, and O2 sensor controls
Mr. RPM big bore kit
Ported and polished heads
4.5 mm oversized intake valves
2 mm oversized exhaust valves
New timing chains and shoes
Gen 2 cams
51 mm throttle body
300m throw shaft
13:1 Flat top pistons
oil filter adapter
double valve springs
Of course the motor and dash harnesses will have to be reworked, new motor mounts and the list goes on and on. But thats what we all love to do.
The motor is built and I am just waiting on the intake to come back form casting and machining.
Various other parts to get the system working right will include
2- Walbro 255 pumps
2- Metric thread to #6-AN Conversion kits
2- Walbro in-tank pickups
1- Walbro in-tank pickup with bleed hole
3- #6 shut off valves
1- Pre pump filter
1- Post pump filter
1- Autometer Pro Comp liquid filled mechanical oil pressure gauge
1- Autometer Pro Comp liquid filled mechanical water temp gauge
1- New Fullbore dash
1- Header wrap kit
1- K&N air filter
1- K&N air filter wrap
For exhaust I am using a combination of the Muzzy conversion system and part of my existing system. The two head pipes and the two-into-one-into-two pieces came form Muzzy. I will TIG up the connections to the 2 big FMF PowerCores already in the Rhino.
At this point I've got the old motor out and the floor pan cut out ready for the new motor. Still need to gather a few things but hopefully it should start coming together soon.
Thanks for reading.