Q500 .40
05-06-2005 | 04:19 PM
#1
Thread Starter
My Feedback: (27)
Q500 .40
I'm planning on running a Q500 engine with the cylinder turned to make it a rear exhaust with the full length MVVS pipe on a delta. When I looked at the Q500 engine I have on http://mvvs-nl.com/ it says "AWFULL PERFORMANCE" . Am I missing something or should I be using a different engine?
Thanks,
Pete
Thanks,
Pete
05-07-2005 | 12:04 AM
#2
Senior Member
RE: Q500 .40
Hi Pete,
The MVVS Quickie engine is truly a beast.
The I sold several in Israel, despite the fact that there are no sanctioned racing classes here.
They are being flown in Terminator type models and making some very nice speeds.
I broke one in with the customer and it spun the 9x6 MA prop we used at 18,300 RPM (which is really not safe for this prop; limited Windsor Propeller to 17,777 RPM (160,000/diameter)).
An APC of this size is close to 18,000.
With the header extended (some 'air' in the silicone coupler), it spins a 10x6 at 16,200 RPM.
...Don't forget that it's just a .40.
All these numbers are with the dedicated #3246 tuned silencer and the original side-exhaust configuration.
There is somewhat better flow in rear exhaust configuration, since the bypasses match more perfectly. But the only full length pipe MVVS make for this engine size will neither fit, nor match the RPM.
This engine is planned to peak at a maximum of 23,000 RPM, with a suitable prop, but the #3247 pipe is for the #3070N/R GRRT/GRFT engines, that run at 25,000-over 32,000 RPM.
Maybe the longer rear header will work to lower the RPM of the pipe, to what this engine can do, but I cannot be sure.
You could use the MVVS rear header with the dedicated tuned silencer and get better performance, or you may want to supply a racing pipe from another source.
The MVVS Quickie engine is truly a beast.
The I sold several in Israel, despite the fact that there are no sanctioned racing classes here.
They are being flown in Terminator type models and making some very nice speeds.
I broke one in with the customer and it spun the 9x6 MA prop we used at 18,300 RPM (which is really not safe for this prop; limited Windsor Propeller to 17,777 RPM (160,000/diameter)).
An APC of this size is close to 18,000.
With the header extended (some 'air' in the silicone coupler), it spins a 10x6 at 16,200 RPM.
...Don't forget that it's just a .40.
All these numbers are with the dedicated #3246 tuned silencer and the original side-exhaust configuration.
There is somewhat better flow in rear exhaust configuration, since the bypasses match more perfectly. But the only full length pipe MVVS make for this engine size will neither fit, nor match the RPM.
This engine is planned to peak at a maximum of 23,000 RPM, with a suitable prop, but the #3247 pipe is for the #3070N/R GRRT/GRFT engines, that run at 25,000-over 32,000 RPM.
Maybe the longer rear header will work to lower the RPM of the pipe, to what this engine can do, but I cannot be sure.
You could use the MVVS rear header with the dedicated tuned silencer and get better performance, or you may want to supply a racing pipe from another source.
05-07-2005 | 03:48 AM
#3
Senior Member
RE: Q500 .40
Thanks Dar.
To add to that:
the quickie cylinder/piston is a direct replacement set for the old grrt 3065 pylon engine, and I heard reports that the quickie even performs better than the 3070 pylon engine, provided with appropriate tuned pipe.
The piston set combination with 3065GRRT just achied first places in Dutch minitractor pulling, winning both the double engine and triple engine classes, whilst all the high strung car motors bit the dust. Estimated rpm was about 26000 on home made tuned pipes.
Look under customer projects om http://mvvs-nl.com to get an idea what this looks ike.
To add to that:
the quickie cylinder/piston is a direct replacement set for the old grrt 3065 pylon engine, and I heard reports that the quickie even performs better than the 3070 pylon engine, provided with appropriate tuned pipe.
The piston set combination with 3065GRRT just achied first places in Dutch minitractor pulling, winning both the double engine and triple engine classes, whilst all the high strung car motors bit the dust. Estimated rpm was about 26000 on home made tuned pipes.
Look under customer projects om http://mvvs-nl.com to get an idea what this looks ike.
