Boyesen Rad Valve reed cages for the 2010

Boyesen Rad Valve reed cages for the 2010-11 Crossfire 800
The DTR facility was leased this day to Boyesen marketing boss Joe Nocentino for the
reed comparison. As always, the test results are owned by Boyesen, and at their option
are posted on this website. There have been occasions when reed tests have not been
positive, and those test results have not been disclosed, and those parts shelved and not
included in the product line. But today, things were very positive, and good parts are
being sold.
518ers Todd Hogan and Bill Logan provided the stock 2010 Crossfire 800 that we used
to compare stock Arctic Cat reeds to the new Boyesen Rad Valve reed cage assemblies
(Eyvind Boyesen used to call them “Rage Cages”). Their reward for providing the test
machine and the labor to swap components was the set of Rad Valves and a max HP
Power Commander tuneup for stock hilldragracing (without the Rad Valves in place, of
course!). Todd had welded an O2 sensor bung into the rear cone of the stock pipe,
midway between the heatshield and the outlet stinger. We fitted the dyno O2 sensor into
the bung to obtain wide band A/F ratio and airflow CFM (LM1air) computed by the dyno
computer from measured fuel flow and A/F ratio. Sometimes airboxes have less than
perfect fitment from the stock airbox to the throttle bodies or carbs, showing lower than
actual mechanical airflow CFM. Having this second airflow reading is particularly useful
in testing intake components. For some reason, the fitment of the bung created leaner
than actual A/F readings, resulting in slightly inflated, but very repeatable LM1air
numbers. We like to see the bungs fitted to the actual stingers where exhaust velocity is
highest, welded to the topside to prevent condensed water from fouling the O2 sensor in
the morning on startup. But Todd noted that since this sled was being used for stock
hilldrag racing, he didn’t want to raise concern by tech inspectors who might think the O2
sensor intruding slightly into the stinger might increase backpressure and HP. The Power
Commander Autotune bungs are very tall, and just the very tip of the Bosch O2 sensor
dips into the stream of exhaust, and has no effect on backpressure.
We also removed the stock pipe center section thermocouple and unplugged it from the
wiring harness, which causes the ECU to default to 960 degrees F where max timing is
delivered. In its place we installed a combination pressure and temperature sensor so the
dyno could monitor both pipe backpressure and pipe center section temperature. Each
dyno test was begun with 100 degree F coolant temp and 700 degree F pipe temp, and
ended at 120 degree F coolant temp and 1000+ degree F pipe temp. When those two
temperatures are exactly repeated from test to test, power numbers also repeat, usually
within only a few tenths of a HP! On our comparison graph, two tests of each reed set are
shown then averaged to create the displayed corrected data.
Even though this was early February, it would be an awful weather day for this
comparison—22 degrees F early in the day, then warming up to 40F plus with drizzling
rain which would surely skew the results. So we fired up the three walkin freezer
compressors and fed the engine with dry 25 degree F air all day, ensuring perfect
repeatability and accurate assessment of the reeds.
Here is the Crossfire 800 stocker, the average of two tests:
2010 crossfire 800, stock reeds
EngSpd
RPM
5600
5700
5800
5900
6000
6100
6200
6300
6400
6500
6600
6700
6800
6900
7000
7100
7200
7300
7400
7500
7600
7700
7800
7900
8000
8100
8200
STPPwr
CHp
91.2
92.6
94.4
96.5
98.8
101.2
103.2
104.9
106.4
107.8
109.4
111.9
115.6
120.2
124.9
129.1
133.4
137.5
141.2
144.7
148.9
153.1
155.9
157.1
156.2
151.7
141.7
STPTrq BSFCAB
Clb-ft
lb/hph
85.5
0.685
85.3
0.678
85.4
0.662
85.9
0.643
86.5
0.628
87.1
0.613
87.4
0.603
87.4
0.607
87.3
0.606
87.1
0.601
87.1
0.616
87.7
0.621
89.3
0.615
91.5
0.611
93.7
0.611
95.4
0.621
97.3
0.634
99.1
0.627
100.2
0.626
101.3
0.649
102.9
0.653
104.3
0.651
105.1
0.651
104.4
0.657
102.6
0.671
98.4
0.694
90.8
0.755
FulAB
lbs/hr
62.2
62.5
62.2
61.8
61.9
61.9
62.1
63.5
64.3
64.6
67.3
69.3
71.1
73.3
76.3
80.1
84.5
86.1
88.3
93.9
97.3
99.5
101.5
103.2
104.8
105.5
107.1
AFRAB
Ratio
13.1
13.1
13.3
13.6
13.7
13.9
13.9
13.8
13.8
13.9
13.8
13.8
13.8
13.8
13.6
13.2
12.8
12.7
12.6
12.1
11.9
11.8
11.7
11.6
11.4
11.3
11.1
ExhPrs
psig
1.3
1.3
1.5
1.5
1.6
1.5
1.6
1.6
1.7
1.7
1.7
2.1
2.2
2.3
2.3
2.4
2.6
2.7
2.7
2.9
3.2
3.3
3.3
3.5
3.6
3.2
2.9
Exh_1
deg F
697
712
724
738
753
771
786
801
815
827
847
862
882
900
915
925
932
939
948
962
975
989
1002
1014
1023
1026
1022
LM1Air
SCFM
204
205
206
207
210
210
210
214
215
217
231
239
239
241
247
253
259
258
264
274
274
277
280
283
284
286
289
Todd and Bill replaced the stock reed cages with the Boyesen Rage Cages, which are
multi-layered reeds fitted to aerodynamic aluminum castings (see photo below) and we
increased airflow 2.5% and horsepower 2.5% from low RPM to beyond the HP peak.
There was not a large enough airflow increase to change backpressure, but the
combination of higher airflow with fixed fuel flow gave us an average 3.5HP increase.
2010 Crossfire 800, Boyesen Rad Valves installed
EngSpd
RPM
5600
5700
5800
5900
6000
6100
6200
6300
6400
STPPwr
CHp
94.7
96.1
97.8
99.6
101.6
103.5
105.4
107.1
108.8
STPTrq BSFCAB
Clb-ft
lb/hph
88.9
0.721
88.5
0.689
88.5
0.662
88.7
0.637
88.9
0.625
89.1
0.607
89.3
0.599
89.3
0.599
89.3
0.602
FulAB
lbs/hr
67.7
65.7
64.3
63.1
63.1
62.5
62.8
63.8
65.2
AFRAB
Ratio
12.3
12.8
13.1
13.5
13.7
13.9
14.1
13.9
13.7
ExhPrs
psig
1.2
1.4
1.3
1.4
1.5
1.6
1.6
1.6
1.7
Exh_1
deg F
723
735
746
760
774
791
807
823
838
LM1Air
SCFM
216
210
212
215
218
217
218
221
224
6500
6600
6700
6800
6900
7000
7100
7200
7300
7400
7500
7600
7700
7800
7900
8000
8100
8200
8300
110.4
112.1
114.6
118.4
123.3
128.1
132.4
137.1
141.3
144.8
148.5
153.1
157.1
159.9
160.9
160.1
156.3
146.5
133.1
89.2
89.2
89.8
91.5
93.9
96.1
97.9
99.9
101.7
102.8
104.1
105.7
107.1
107.6
107.1
105.1
101.4
93.8
84.2
0.594
0.609
0.612
0.611
0.603
0.601
0.609
0.616
0.614
0.624
0.645
0.653
0.651
0.644
0.651
0.658
0.678
0.741
0.811
65.2
67.9
69.8
71.9
74.1
76.7
80.4
84.1
86.5
90.1
95.6
99.7
101.8
102.7
104.5
105.2
105.9
108.5
107.8
13.9
13.8
13.9
13.8
13.8
13.6
13.3
12.9
12.8
12.4
11.7
11.7
11.7
11.7
11.5
11.5
11.4
10.9
10.8
2.1
2.1
2.1
2.2
2.3
2.3
2.3
2.5
2.7
2.8
3.1
3.3
3.4
3.5
3.5
3.3
3.2
3.1
2.8
850
865
884
901
916
929
938
946
954
961
974
986
999
1010
1020
1031
1037
1032
1017
224
239
246
248
249
251
257
261
263
272
280
282
285
285
288
288
290
296
290