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Author Topic:   cam help
skippydoo
Dirt Roller

Total posts: 18
posted August 01, 2005 06:44 PM  
my current cam is @.050 252/260 in at 99-1/4
and lift at the valve is 588 intake and 602ex. it is a comp cam and its a solid lifter cam. Cam is a special grind . I called comp cam and they told me the cam is the most aggressive grind they make. The lift at .200 is very aggressive. My question is I want more bottom end/midrange power. I tried going from .016 lash to .026 on both intake and ex and it helped . did not hurt top end at all, but I still need more bottom and mid in the 3200-5000range. How much should I take out of the cam? Is 246/250 with the same lift a big difference? How much of a difference is needed so driver can feel it? Also what has biggest effect on bottom/mid power the intake or ex duration?

chickenlittle
Dirt Full Roller

Total posts: 64
posted August 01, 2005 09:22 PM  
You need to let us know what displacement the engine is. Makes a big difference in cam selection. Another important aspect is your LCA you probably want to run around 108 with 360 or smaller and around 106 for 360-400 and 104 for 400+ ci. You need around 70-95 degrees overlap on the duration. Cylinder heads also make a huge difference on cam. You need to have everything match up for what you are trying to achive.

skippydoo
Dirt Roller

Total posts: 18
posted August 02, 2005 04:01 AM  
Motor is a 358 chevy 4412 carb. Heads are slightly ported bowtie. Motor makes 436 hp and 416 torque. I just want more bottom/midrange power

sc1 racing
Dirt Freak

Total posts: 419
posted August 02, 2005 08:03 AM  
the way it sounds it should be comming to life at 3000..what rpm are you turning? may need more gear, also might want to check your carb over pretty good...

skippydoo
Dirt Roller

Total posts: 18
posted August 02, 2005 02:30 PM  
turning 7200-7300 max rpm tried more gear 9points and it helped ,but rpm was 7400. plus oil temp went to 270. Alreday tried another carb with same results.

autoshop
Dirt Freak

Total posts: 298
posted August 02, 2005 03:01 PM  
advance the cam 6* that will bring the power range in lower.

sc1 racing
Dirt Freak

Total posts: 419
posted August 02, 2005 09:18 PM  
what kind of heads are you running? they may be out of flow...LOL

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