So I bought a 660

Changing the schrader valve in the end may help. Napa has them . It doesnt use a regular schrader valve

 

As compared to this 660, likely. I'll remove the dawgs if it makes you feel better.

 

True. I would expect it to leak off though if something was bad? I didn't let it sit this time, but when I tried it last week (or whenever it was) it held for several minutes.

 

So, Is my old big block F350 going to be faster than your brand new F150 raptor? probably not. stoplight to stop light, the newer, smaller engine and efficiency of power and lighter weight will make that raptor faster. Or possibly about even, if I get the jump.

Now, lets put 12K lbs on the azz end of them and see who wins. I betcha that old big block will out pull it. So, stop light to stoplight empty they are about even, except I'll use more fuel doing it. Load them down like they were designed and then it will clearly show. 12K lbs is similar to a 28-36" bar for this comparison. Now put a 28-36" on that stock 372 and you will clearly see the 660 grunts away.

Does that make sense?

your 359 probably had a catalytic converter. they are choked up pigs in stock form that don't have the power to pull a 20" bar. So you went from that to huskys top performing saw for the midrange pro market. the 372 is the Do it all saw. So yeah, there was a big difference. now, if you would have had that 359 ported, it would run better than a stock 372.

The 066 should have a 7 pin on it the way you are trying to force it. They are 5 bucks at a stihl or husky dealer. You were leaning on the saw hard. I could see the av mounts bottomed out against the tank. take the one off your 372 and put on the 066. Then put the 8t on your 372 and see how it acts while you are trying to run it the same way. people don't realize how much torque you give up running a 8T over a 7T. Dawgs are not meant to use to pry on a saw. Take them off and see how it cuts. but as others have said, open the damm muffler up. a muffler mod on a newer 066/660 is night and day difference. The good running 066's had a dual port cover and the outlet on the side by the chain brake. the original outlets on the side were about 1/2" in diameter, and the opening on the front cover was 1/2 x 1.5". your only opening is 3/8. you will gain almost a full horsepower by doing a simple muffler mod.

 

I have a 175$ snap on gauge and go through valves regularly

 

Make sense? I see where you're coming from. But it's really a comparison. Big block has less HP and torque then the smaller Raptor motor, so in order for it to compare my 72cc would need to have more power and torque. If you're willing to place a bet on towing 12k# I'll drive the Raptor

 

I think better better example between the Raptor and the F350 would be if you said, "oh, and you have to shift at 2,500 RPM".

 

ok, I didn't want to go there, but how about an eco-turd-boost. My big block is older and has more HP and Tq...

seriously, take the 8 pin off your 660 and put the 7pin off your 372 on it. larger rim with a lot longer dawgs will kill the strongest of saws when leaned on hard.

 

For us less than mechanical guys, does anyone know or sell modded mufflers? I'd rather not fool with it, since I'm not sure.

Back on topic, I agree that the sprocket change is noticeable. I have run a 25" 8 pin set-up on my biggest saw and it still cuts quick if you don't put too much pressure.

I would be happy to take the 660 for a fair price if O.P. doesn't want it anymore. I'm sure I can find a use for it.

 

chads dyno doesn't do tq readings does it? Torque is what makes the chain cut, Hp is what keeps the chain spinning, it would be interesting to see the tq curves between those same saws. that chart is deceiving to people that don't understand how hp is derived from torque and some people would look at that and think dawging a saw in would be faster than letting it cut based on HP/RPM on that chart, but we all know that isn't the case.

 

Ya it needs a 7 pin to be fair. Josh does the 372 have a 7 or 8 pin?

 

Depends on the bar tip. The 32" is having to turn more chain.

 

He gets the torque and then calculates hp.

 

I'm not looking to feel better. Making you aware of other things to consider.

Also compression testers don't leak off if they are not accurate.

Put a 36" bar on that 372. Then put about 1000 hours run time on it and then you'll know what the 660 was intended for.

 

It had never crossed my mind till you asked. Glad you did. 372 is a 7pin. I'll have to swap it over and try it if it ever stops raining.

 

I asked about the leak because of the schrader valve, not inaccuracy.