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Author Topic:   jet size?
LUBEGUY07
Member
posted March 27, 2002 09:43 PM
One of my friends is starting his first year of racing in a econo stock class.He has to run a two barrel rodchester carb and stock two barrel intake. His motor is a flat top 9 to 1 355 with smogger 882 heads stock hei and stock log type exsaust manifolds. He will be racing on a 1/2 mile dirt track .He and myself arnt sure of what size jetts we should start with, his carb is tapped for holley jetts.Any advice or info would be appricated I also race but dont want to lead him astray i dont use that carb so i am not sure ,thanks


BK19
Member
posted March 28, 2002 07:25 AM
i use 71 to 73 on my motor like that


racer17j
Member
posted March 28, 2002 11:49 AM
good to see i'm not the only guy from webster on here anymore lol but anyway bk is right depending on the weather thats a good place to start are you guys running saturday?


dode
Member
posted March 28, 2002 12:20 PM
Wow...this sounds like exactly the same setup we are running, except we have a 4 barrel manifold and quadrajet. What head gaskets do you use with 882's and flat tops to get 9:1? What gears are you going to run at your track with that setup? We race half mile too. Thanks.

John

LUBEGUY07
Member
posted March 28, 2002 06:50 PM
ok thanks for the info, 17j i think we will be there saturday and dode i just use regular felpro 350 head gaskets and 513 gears



racer17j
Member
posted March 29, 2002 03:51 AM
thats what we use just stock ones if you have done nothing to the heads or block you should come out right around 8.7. as for a gear it all depends on what your gonna run for rpm and tires lube and i run the same track and i pull a 4.90 with 82 in tires and turn right around 6000. most of the hobby stock guys here run 84 in tires with a 5.83 or 6.0 gear and turn 6500-7000


NYhick
Member
posted March 29, 2002 08:37 PM
Hey racer17j!!! You guys are running 6500 to 7000 rpm's in a hobby stock? Doesnt sound too stock to me! What is your tracks idea of a "stock" motor? I wouldnt dare try to get that much out of my stocker. And by the way, the jets used by BK19 sound pretty good to start. I use a 70 on hot nights, a 71 on normal nights, and a 72 on colder nights. Elevation will also make a difference. I am near the Adirondacks so the air is a little thinner.


KPLugnut
Member
posted March 29, 2002 09:07 PM
Hey, NYHick. Where are ya located? I'm down in Ithaca, not too far from you, it seems.
You guys are about right on in your jetting suggestions, too. Depending, of course, on all of your different cams, and intake combo's, not to mention just how much head work (if any is done).
72-76 is what I'd have to say the national average on all our stock 2G carbs.
Our "outlaws" are a different animal, however...
Anyone have suggestions for Lubeguy on power valve alterations? I'll throw in something to start....1.5 coils cut off the power piston spring, for starters.

Hopin' to help every racer everywhere,
KPLugnut


NYhick
Member
posted March 30, 2002 10:18 PM
KP, I am just north of the Fonda Speedway about 15-20 miles in Mayfield. On the Sacandaga Lake, gateway to the Adirondacks.


racer17j
Member
posted March 31, 2002 11:58 AM
most of them run midwest or jr motorsports motors or scat cranks with reconditioned rods


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