I stand corrected, did a little hands on research and found that the Losi 427 is a 7 port (6 intake, 1 exhaust) engine. Dynamite M427 is 4 intake, 1 exhaust. SH28 is 3 intake, 1 exhaust, same with the M26SS. V2 is 6 intake 1 exhaust, difference in TL427 and V2 is port timing, V2 exhaust port is 1mm closer to the top of cylinder measured with dial caliper. Higher exhaust port and longer blowdown (distance between top of transfer ports and exhaust port) equals more top end power, which describes the V2, it's got great top end scream. I think the crank timing is a bit different on the V2 and L427 also which makes the L427 a better low end mill but it won't run with the V2 on top. Either engine is a great choice for a replacement in the Avalanche as the lifespan on both is better than the SH.

Now as for performance, you peaked our interest in this issue so we had a shootout today to see which was faster. We used two Redcat Hurricane XP's with NEW engines one with the SH28 and one with a Sportwerks .26V2. We broke in both engines and tuned for max performance and used Redcat clutches on both. The results in side by side drag races (on pavement) were as follows.

From dead stop
30' win SH
60' win SH
90' win V2
120' win V2

From a rolling start
30' win SH
60' win SH
90' win V2
120' win V2

We did multiple runs with different drivers and the results were the same. At 30' & 60' the SH held a 10-15' lead, at 90' the V2 had a 5-10' lead, at 120' the V2 was 10-15' ahead.

On the racetrack there was little if any difference in performance between the two engines, but the V2 did get almost 1 more minute of run time per tank.

Next we are going to try the same tests with a Axial .28 and a Dynamite Platinum .28, should be fun!

Altus RC Hobby