Visit The Dirt Forum for More Information

Author Topic:   Summit Rotating Assembly
Winland Racing
Dirt Maniac

Total posts: 124
posted November 17, 2005 02:53 PM  
I just purchased this rotating kit from a guy for about 1/2 price. sum-csum355kit
summit crankshaft cast iron internal balance
summit stage 1 rods, I beam 4340 steel
KB Hypereutectic pistons 12cc dished
I am going to run this in my enduro motor. Should be about 9.5-1 with 64 cc heads.
Any luck with this set up? Will it hold up to 200 lap races? What kind of HP would I expect with cast 4bbl, unported with KP worked quad.
Any opinions.


Winland Racing

Dirt Full Roller

Total posts: 28
posted November 17, 2005 06:45 PM  
I don't see why it wouldn't work.

Not real sure on your HP ratings. Just remember it's a cast bottom end with Hypers on it, so try to keep it at a max of 7000 RPM.

Ego Racing
Dirt Forum Champ
Total posts: 739
posted November 17, 2005 08:44 PM  
First GET IT BALLANCED! This unit is sold non ballanced for some reason? A complete kit should be ballanced but they are trying to sell it cheaper. Do NOT over run the cam you use... if the MAX RPM of the cam is 5500 do not think you are getting more out of it by turning it to 6500 or more. If you are running a stock cam and can adjust the cam timming you might get an extra few hundred RPM out of it. Remember a stock cam is going to run out of power quickly above about 4500 RPM. The musle car cams like the 300hp 327 cam maxed at about 4500-6000.

Winland Racing
Dirt Maniac

Total posts: 124
posted November 18, 2005 09:52 AM  
I am going to have my machinist check the balance and balance it accordingly. I am just wondering what I will be leaving on the table with the 12cc dished pistons?

Dirt Maniac

Total posts: 139
posted November 18, 2005 10:17 AM  
12cc dish is pretty small actually. I've seen 4 valve relief flat tops that are 8, so I wouldn't worry much. If you don't have a rule on type of gas or compression, maybe deck the block of shave the heads to bump it up some.

Back to the Archives