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Author Topic:   Good Dry Slick motor
RACEINMUD
Member
posted September 23, 2003 02:47 PM
Was curious what you'll thought would be the best choice for 1/4 mile dirt. 3200lb metric. 355/377/406. Have almost all stock parts to built the 355 or 406. Will need to run 2bbl Roch(KP's) & have 461 heads for what I ever I slap together. Thanks! Mud

[This message has been edited by RACEINMUD (edited September 23, 2003).]

leftturn73
Member
posted September 23, 2003 02:56 PM
I have had great luck on dryslick tracks with a simple 355 same 461 heads 194, 160 valves. Reliable and great power when others are spinning you can just motor by.


Raz_900
Member
posted September 23, 2003 03:22 PM
A 406 would be really hard to hookup. The 355 would probably be easier to drive (and faster overall). Just gear accordingly.


flanndad#17
Member
posted September 23, 2003 04:52 PM
Why would the 406 be hard to hook up?
I thought a 406 used torque and lower gearing, which would produce less wheel spin.
I've been running a dry/slick track with my 406. Not during great but keeping up.
Only turning 5,800 rpm.


RACEINMUD
Member
posted September 25, 2003 04:02 PM
looks like I'll go after the 355 with flat tops & 461's and save my 406 block and crank for the rainy season. Thanks, Mud


gonfast
Member
posted September 25, 2003 07:47 PM
quote:
Originally posted by flanndad#17:
Why would the 406 be hard to hook up?
I thought a 406 used torque and lower gearing, which would produce less wheel spin.
I've been running a dry/slick track with my 406. Not during great but keeping up.
Only turning 5,800 rpm.

Exactly.. the advantage of the 406 is the torque... but when you have to kill said torque by lowering the gearing what's the point? You're not motor limited coming out of the turns on a slick track, you're traction limited. But, you can put more power down at the midlle - end of the straight. So, a 350 with higher gears will apply the same net torque to the tires coming out of the corners as a 400 with lower gears, but will be able to climb to the higher rpm range and make more HP at the end of the straight where the tires can use it. A 350 spinning 6500 at the end of the straight will more than likely be making more HP than a 400 spinning 5500.

Now with big tires, a heavy track with virtually unlimited traction all bets are off. Then, you need the 400 wound up and screaming it's lungs out.


outlawstock17
Member
posted September 30, 2003 10:30 AM
in any traction limited application, i'd opt for the long rod, short stroke, big bore combination.


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