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Author Topic:   Need suggestions on carb
DRogers
Dirt Roller

Total posts: 6
posted April 09, 2004 09:41 AM  
What is the best way 2 run a Holy 500 2 barrell carb on a cast iron high rise intake & get more horsepower? If its the jets what size should be used?

DRogers
Dirt Roller

Total posts: 6
posted April 09, 2004 10:00 AM  
Here's another question. New motor just put in the car. Ever since it has run hot. What could be causing teh problem? Also what kind and size fuel line is a good size to run using 93 octane fuel?

racer17j
Dirt Forum Champ
Total posts: 5390
posted April 09, 2004 03:45 PM  
holler at kp on this forum about your carb question.....later

DRogers
Dirt Roller

Total posts: 6
posted April 14, 2004 12:49 PM  
Nate who is KP and which part do I go to 2 holler at him. Engine tech or what?

KPLugnut
Dirt Forum Champ
Total posts: 1019
posted April 14, 2004 01:18 PM  
"KP" is Kinetic Performance. We are a forum sponsor and tend to hang out daily on all the forums, mostly just soaking up the sun. :-)

Feel free to click on our banner (when it scrolls by) and check us out.

Or just email me on the side here:
kineticperformance@thedirtforum.com

After 5pm EST, I'm usually at the home/shop number, too: 607-277-6462.

At yer service....:-)

Dayton Umholtz, co-owner (aka "KPLugnut")
Kinetic Performance

KPLugnut
Dirt Forum Champ
Total posts: 1019
posted April 14, 2004 01:24 PM  
Now, with that shameless sales pitch out of the way... :-)

The first question about setting up a 2bbl on a larger open plenum intake, many racers find it a benefit to rotate the carb sideways on the high rise intakes (bowl facing driver's side). This, paired with the proper cam grind for this kind of animal, is found to be a power maker and make the car more driveable/smooth through the turns.
It's very common in the northeast here in the DIRT circuit on the 2bbl mod motors.
Of course, the carb needs to be set up a bit different for this kind of application as well, as the vacuum signal is very different compared to the same engine with, for example, a GM 2bbl iron intake.

Next, on your overheating issue, it could be many things, but we'd need more info as to what your whole engine package (and cooling system) is in order to answer.
Where's your timing at?
Where is the carb jetted at now? Any other mods done to the carb?
How much compression does the motor have, and why are you running 93 octane pump gas?
Anything over 9.5:1 or 10:1 and you need more octane than that.
What heads are on the motor?
What kind of water pump/pulley setup? Stock radiator or alum aftermarket? Shroud?

need info to get info....

Hope that starts the ball rolling for ya.

KP

Scoot
Dirt Forum Champ
Total posts: 517
posted April 14, 2004 02:57 PM  
Hey KP its not my post but I'm using the same setup. A holley 2 bbl carb built by you and a stock cast iron high rise intake thats been gasket matched. What would be gained my turning the carb sideways? And how in the world would that work?

KPLugnut
Dirt Forum Champ
Total posts: 1019
posted April 14, 2004 07:20 PM  
Hi Scoot. You can't turn your carb sideways due to the intake plenum design. There's no such animal of a carb adapter, anyway, and it would not help your power any at all.
Carb rotating is only a benefit on large, open plenum 4bbl racing intakes, such as the DIRT spec 4bbl intake mandated in the DIRT Sportsman modifieds. That intake is a Brodix hi rise (i.e., GIANT) intake.

KP

Scoot
Dirt Forum Champ
Total posts: 517
posted April 14, 2004 08:23 PM  
ok thanks

------------------
Scoot
Smith Racing Team
870-365-5989

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