ideas for 12 second 305?? [Archive] - Team Camaro Tech

: ideas for 12 second 305??


fossilrunner
Sep 19th, 06, 09:41 PM
Ok I the 305 I got needs new rings so we gotta pull the motor. SO I figured why not do some more stuff to try and get it into the 12's. SO heres what I got so far:

3204lb car
4.10's
3000 stall
performer rpm manifold
650 holley double pumper
10:1 compression
ported stock 305 heads
1.5 and 1.6 roller tip rockers
and I still need a cam but need some ideas. Streetabillity isnt that big a deal to me so I do want something that idles really rough but is still gonna have real good power. Dont have power brake so dont need to worry about vacuum.

dylanjans
Sep 19th, 06, 09:55 PM
I don't know man....
3200 lbs is do-able, but those 4 extra pounds are crippling.

You could always use nitrous to get there faster.
Most guys here will suggest a 350.
PDQ67 will hook you up with some "little engine" combos

Eric Kammerer
Sep 19th, 06, 10:00 PM
Welcome to Team Camaro!

What's it running now, ET and MPH wise?

fossilrunner
Sep 19th, 06, 10:02 PM
Yeah I know every one says 350's but I got a 305 So Im gonna try something different

fossilrunner
Sep 19th, 06, 10:04 PM
well I havnt taken this car to the track yet cause it smokes to much and leaks oil cause the rings are the wrong size. all the parts that I listed are just parts Ive been collecting to do a build up

Eric Kammerer
Sep 19th, 06, 11:04 PM
I did a Google search on "305 chevy build" and a ton of info came up, including this link.

http://jalopyjournal.com/forum/archive/index.php/t-1494.html

Mwilson
Sep 20th, 06, 11:26 AM
it should only take about 250 rwhp to get into the 12's with the right converter and gear at 3200 lbs, I dont think you'll have a problem just do your research, you'll need compression, good heads and the right cam.

DjD
Sep 20th, 06, 11:47 AM
it should only take about 250 rwhp to get into the 12's with the right converter and gear at 3200 lbs, I dont think you'll have a problem just do your research, you'll need compression, good heads and the right cam.


When I was following the 4th gen cars closer 285-300 hp at the wheels was mid to high 13's. What is the right converter and gears to put a 3200lb car into the 12's with 250 rwhp?

onovakind67
Sep 20th, 06, 11:58 AM
Here's some 305 Camaros running 10.30's. Maybe they can help you.

http://www.shopoutdoors.com/b&lracing.htm

The F/FIA cars run 11.50's in stock eliminator.

Silver69Camaro
Sep 20th, 06, 12:41 PM
Nobody here can really give you an answer on what you need to do to the motor to make those timeslips. You need to buy some drag slicks and see where you are at right now. Then you'll know which direction you need to go.

With great traction, 12's is easy.

Drag Fabricator
Sep 20th, 06, 01:09 PM
When I was following the 4th gen cars closer 285-300 hp at the wheels was mid to high 13's. What is the right converter and gears to put a 3200lb car into the 12's with 250 rwhp?

An accurate estimation of the power i make with my engine is 415hp at the crank.
taking 20% for drivetrain loss, thats 332 RWHP......and 11.22 @ 117 with a 1.46 60ft, in a 3215lbs 67' Camaro.

theres a host of 11-10 second 305 engines in stock eliminator. Say what you will about how stock they are, but those guys are all doing it with stock castings, stock compression, stock carbs (or FI), stock intakes, and a stock lift cam, along with 1-1/2" to 1-3/4" primary tube headers.
the cars arent light ethier.

to answer your question, an ATI treemaster, and somewhere along the lines of 4.10 gears depending on the estimated peak power RPM and trap speed.

dylanjans
Sep 20th, 06, 01:32 PM
A 12 second 305 would be some impressive bragging rights!
Not everyone can do that.

pdq67
Sep 20th, 06, 06:07 PM
Try here!!

"From a 1995 Chevy High Performance article.

305 Engine Build-up.

1 ’69, 041 double hump 1.94”/1.50” valve heads cut to 59 cc’s. Bowls blended and only the exhaust ports polished.
2. Manley Pro-Flo valves, PN 11560 intakes and PN 11559 exhausts.
3. CC 292 Magnum hydraulic cam, 292/244, 110/106, .501” lift.
4. 350 rods rebuilt with good bolts and nuts.
5. L-69, 9.5 to 1 CR. LU5 fuel injection short-block engine with stock head-gasket gives 10.6 to 1 CR. Or a
6. LG4, 8.6 to 1 CR. engine will give 9+ to 1 CR.
7. Deck height was .014” down with stock four valve notch cast pistons.
8. Quench was about .035”.
9. Hooker 1.75” four tube long headers with 3.0” collectors. PN 2110 for a Third Gen. car.
10. Holley 650 double pumper PN 4777 and an E-brock Victor Jr. intake.
11. 4” K&N open filter.
12. Good Electronic ignition

The little bugger made like 402hp up top!! They ran it until she spun a bearing or just came unglued!

AND

An old RHS, Memphis, TN, 305 motor build-up that makes right at 300hp. http://www.goingfaster.com/spo/290hp305.html
Chasis Dyno Test
7000rpm --- 300hp

And Hotrodding the 305!
http://www.goingfaster.com/spo/modthel03.html"

I saved these just for this!!

BUT, imho, a 144 blower will get you there easier than anything else..

pdq67

fossilrunner
Sep 20th, 06, 09:15 PM
well I got the 4.10 gears and 3000 stall converter. I also got 275/60 m/t drag radials and traction bars so getting it to hook should be no problem.

DjD
Sep 20th, 06, 09:42 PM
well I got the 4.10 gears and 3000 stall converter. I also got 275/60 m/t drag radials and traction bars so getting it to hook should be no problem.


What about the rest of the suspension?

fossilrunner
Sep 20th, 06, 10:25 PM
all stock except rear is mono leafs and competition engineering traction bars. also has afco drag shocks.

ALSO STILL NEED CAM IDEAS!!

Bgonz 69
Sep 21st, 06, 04:10 PM
I wasnt going to put in my .02 because i dont want to sound like it cant be dont,because it can, but it just doesnt make sense to do it.
Find a 350 motor for $100 and start the build off right. You'll be much happier in the end and will save quite a bit of cash in the process.
good luck.


bob

fossilrunner
Sep 21st, 06, 10:34 PM
ok heres my answer for that. I have a 355 in my garage that im building but its gonna be a pretty crazy setup for the street. Its gonna have dart iron eagles,custom ground crower solid cam, 11:1 compression, big edelbrock single plane. 850 double pumper, NOS big shot plate probably like 250-300 shot,same 4.10 gears and Ill probably move up to a 3500 stall.

But right now I only wanna put like $700 into this motor and get my car to run a pretty decent times and then I can work on getting my suspension all done and getting everything settup for nitrous while having a motor that can still perform decent.

travis
Sep 22nd, 06, 07:22 AM
I had actually posted this same question a while back. I have a very similar setup as you (although a bit heavier). I have a cam that I think would work great for you...its what I planned on using on my 305 with a set of vortec heads. Its an Isky 274 mega cam. Its 281*@.006", 226@.050, .490 lift, 108 lsa, single pattern. You'll definately hear it in a 305 too, buts its not so big as to require 7500 rpms to make power on that little motor either.

markr
Sep 22nd, 06, 07:31 AM
... I figured why not do some more stuff to try and get it into the 12's. ....


It's doable
You just need a 6000 HP Tow Truck.
And keep your foot off the brake.

Eric68
Sep 22nd, 06, 08:50 AM
With a 305 I think you will need some N2O (like 125 HP) to get it consistently into the 12's.

On the motor 275-300 HP is a realistic goal with your heads and a cam with 210/220* duration @ .050 on a 112* LSA. Add 125 HP of N2O and you should be able to get it in the 12's.

On the subject of "how much HP does it take to run what ET" it will get heated and convoluted real quick -- just shoot for about 400 HP at the flywheel and you should be able to get 12's with a reasonably good chassis set up. TQ is a big part of this equation and a 305 doesn't typically have much.

onovakind67
Sep 22nd, 06, 09:07 AM
How does an NHRA stock 1985 305 Camaro go 11.38 @ 116.47? I would think running a 12-second e.t. would be a piece of cake.

camcojb
Sep 22nd, 06, 09:14 AM
How does an NHRA stock 1985 305 Camaro go 11.38 @ 116.47? I would think running a 12-second e.t. would be a piece of cake.


Well, you know how optimized those chassis and engines are, and I doubt his car would be the same. I'd say about 375-400 HP is about right from what I've seen at my track to get into the 12's. Of course with weight reduction, excellent chassis, etc. all that goes out the window.

New GTO's are 400 HP and most all run low to mid 13's. They are 3700 pounds though. C5 Z06's mostly run high 12's to low 13's, and they are 405 HP and fairly light, lighter than his car. These are just the regular street cars, not drag-optimized combos. There are obviously guys who go quicker, but the average guy hits in these ranges, at least as far as I've seen in person.

Jody

onovakind67
Sep 22nd, 06, 09:41 AM
I just don't see the reason for not being able to easily break into the 12's with 305" in a 3200# car. You aren't constrained by the NHRA rules requiring you to run the stock carb, intake, heads, cam lift, etc. I would certainly have more gear and converter than 4.10 and a 3000 rpm stall speed.
You don't have to re-invent the wheel, just find someone who is doing what you'd like to do and repeat it. Do I think a 305 is going to go out and set the strip on fire on the first pass? No, but with some experience and application you could easily run 12's.

Eric68
Sep 22nd, 06, 03:00 PM
Well said Jody :)

Bgonz 69
Sep 22nd, 06, 07:10 PM
How does an NHRA stock 1985 305 Camaro go 11.38 @ 116.47? I would think running a 12-second e.t. would be a piece of cake.


It takes alot more than a $700 investment. ;)


bob

pdq67
Sep 22nd, 06, 08:00 PM
Look,

I don't care what the guys say, IF you wanna beat on a 305, then do it!!

BUT don't come back and bitch about wishing you'd built a 350 motor or bigger for the same money is all!

And I dearly love the high rpm's of the little motors like the 283 to up to the .060" over 327's!!

AND a hopped up SS 287 motor WILL make 500 hp!!

pdq67