Alpha Testing Page

This page will give info from test sessions by the RC Pro Products drivers with the Alpha Engines.

Test Engine
Z852 Green Turbo Head

Engine breakin method - Heat cycle.

Test vehicle - MBX6T
Fuel - 25%

Session 1
From the factory we found the engine comes with a .1 & .2 shim under the head. after breakin the mid range seems to be rich. We removed the .2 shim and ran an additional test session. With all shims in place the squish area is 1mm.

Session #2

.8 squash band AE 2035 pipe 1 x .1 shim 125c

2 flame outs kept blowing its self out.

Session #3

.9 squash band AE 2035 pipe 1 x .2 shim 125c

good power 11.10 run time no flame outs.

Session #4

.9 squash band Mong Mor 2047 pipe 1 x .2 shim 135c

Ok power 11.00 run time no flame outs.

Session #5

,9 Squash band Jammin JP3 pipe Nova conical header 1 x .2 shim 138c

Crap sounding ok power worst of the lot no flame outs.

Session #6

.9 squash band Sirio 2013 pipe 1 x .2 shim 130c

awesome punch great top end no flame outs 12.40 before fill up did not run it out.

All test were performed on a large track with reasonable bite.
The Sirio pipe seems to be the best all round with great power and great runtime.

Driver Notes.
Test vehicle MBX6T
The motor has great take off after standing at idle for 10 seconds or more.
Bottom end power was equivalent to other drivers .28's.
Midrange was very linear and extremely responsive with the 2013 combo.
Top end was equivalent to my normal VZB with Speed crank. No sign of run on after 20 minutes of running.
By the finals I had every confidence in the package and it's reliability to keep running.
Requires a pink head so the competition won't use it!

I must say that I am VERY pleased with these engines. The pictures you are about to see are from my Z852 5+2 port that I mostly have run in truggy. The very same that consistantly has taken me to 11:00+ run times everywhere it's been, has been driven by a dozen different people, in four different makes of buggy and truggy, had 4 different brands of fuel run through it all on only two OS P3 plugs and now with a total of just a tank over 5-1/2 gallons.

The pinch is all but gone but it still has great compression. The backplate is barely scathed, the rear bearing is butter and the front bearing seal is slightly seaping (normal) the piston and wrist pin have no wear and the best part...... The crank pin and rod bushing have no detectable wear!

if anything from the stock measurements I took it's
.00025" or .006mm! in those 5+ gallons.

Tanner Hagler review.
F850

We have 6-6.5 gallons on the F850, and still it has amazing compression, virtually no wear on the motor, and has amazing power.

It took two gallons to break in the motor. We started out with an Odonnell 97t which is the medium plug. Our first race with the motor was the Rc Pro Texas State Finals in Austin, Texas. it started out running great, during practice we decided to pull out the .1mm head shim, which gave the motor more power, dropped the temperature, and increased fuel milage. We were using the O.S. 2050 pipe on the motor to begin with, and we were getting about 7.5 min. on a tank of fuel, and this is with a slight metal pinch on the motor. Next we tried the Associated 2035 pipe, with the motor fully broken in, and that increased fuel milage to about 8.5 minutes on a tank of fuel with great power. Later we tried the Aplus 0801 pipe, which seemed to give the motor a smoother power band, gave the motor slightly more bottom end power, and increased fuel milage to 9.5 min. on a tank of fuel. Also we switched to an Odonnell 77t plug which is the hot plug. We took the motor apart and checked it over and we were very impressed with the results. No wear or scarring on the piston and sleeve, bearings were very smooth with no slop.

Overall we are very impressed with the life and power of the motor.