Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Does these two models share the same chassis and paddle set?  The Rtek engine is the same, however, the 3650 is rated at higher HP.  Is there a REAL difference in HP?  Apparently this same engine is used in the Toro Snow Commander rated at 7 HP.  What gives?  Why 3 different HP rating for same engine?

On a related topic, how does one go about raising the HP of these 2 stroke engines?  Remove the governor and add throttle control?  How do you do that?

Yeah, the problem with all of that additional power was the additional speed. It's self propelled. That was the main reason I sped up the engine was to gain more walking speed. It was just too slow running at 2800 rpm. Now, with it set at 3600 to 4000, it's a good clip without being too fast. Here's a link to one brand of tach. Shop around, I think I've seen them close to half that price. What's really annoying with these things is that you cannot change the battery in them. They're sealed. They're supposed to last five years or so, but that doesn't impress me. Not for $40.00. http://www.jackssmallengines.com/hour_meter.cfm

I'm not impressed with the price.  These mini tach should be around $10-$20, not $40 and $60 at some places.  There's not much to them, even with a sealed battery.

Snow Commanders use a different cylinder and piston than regular R*tek's. The Cylinder has two boost ports flanking the intake port, and the piston has matching windows for those boost ports, that's the main difference and allows a greater air/fuel charge into the combustion chamber = more horsepower.

Loblolly77 wrote:

Like he said
 

So it does, in theory.  Any real gain in HP?

Anyone check the part numbers from Toro/Briggs?  I have 2 "7hp" r*teks and 2 "6.5hp" r*teks in my garage at this very moment and I can tell no difference between them in starting/running/rpms/power.  they are all extremely powerful, easy to start, and run at almost identical RPMs.  The carbs all have the same jetting too (though one of the 6.5hp motors has a metal carb - all the rest are plastic carbs)

The 24” wide Toro Snow Commander has a longer 25MM x 4 inch crankshaft.
The same R-TEK block as found in the Toro CCR2450, CCR3650 & Lawnboy Insight Snowblowers. But the crankshaft on those measures only 2 1/4 inches in length.

 

I think they might really be different pistons.
I’m no parts expert but there seems to be a different parts reference for the piston.  

I compared the part numbers from the 2003 Toro Snow Commander (Model 38602) engine in my garage:

Engine family is 2L4X5-1415BA

Toro engine Model # 100 9536

Toro's web site references the R-Tek engines in the Snow Commander as:

084332-0130-E1 (on: 38600, 38601) piston assembly 801281

084333-0199-E1 (on: 38602, 38603) piston assembly 801281

Then I looked up some 3650 blowers from the same era:
084232-0121-E1 (on: 38517, 38537) piston assembly: 801279
084233-0198-E1 (on: 38518, 38538) piston assembly: 801279 
084232-0121-E1 (on: 38440, 38441) pston assembly: 801279
084233-0198-E1 (on: 38445) piston assembly: 801279