Next step
Thread Starter
Racer
Joined: Aug 2019
Posts: 253
Likes: 24
From: Oklahoma
Next step
Okay, my 79 L82 has new brakes,suspension,tires,engine rebuild which includes standard flat top pistons a 480/288 cam,new 600 cam 1406 Edelbrock on stock al intake and 2” exhaust w/o any emissions and won’t break tires loose and gets under 10 mpg. What are you thinking? Timing at 36 deg. Runs ,idles and starts great, just gutless.
Race Director
Joined: Nov 2006
Posts: 13,068
Likes: 7,682
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
rear end gear ratio?? auto or manual? idle timing? 36 degrees comes in at what RPM? Why such a small exhaust?
Thread Starter
Racer
Joined: Aug 2019
Posts: 253
Likes: 24
From: Oklahoma
288/480 enginetech cam and I assume 8.5:1 or so comp. with flattop hyper-eutectic pistons. 487-x stock heads and exhaust. True duals with no emissions. Stock al. Intake with Edelbrock 1406 carb. Everything else stock 1979 L82. 15hg vacuum. Idles at 750 rpm in gear with very pronounced lope. Chirps tires from 1st to second at WOT. Just not much off the line but runs good with great throttle response. Thought there should be more...?
Thread Starter
Racer
Joined: Aug 2019
Posts: 253
Likes: 24
From: Oklahoma
I figure it will be easier to confirm what I have read with this simple inquiry. When the L82 came out new at 225 hp, it wasn’t a tire shredder and my adding a big cam really didn’t change that. Fair enough said?
Le Mans Master
Joined: Oct 2010
Posts: 6,900
Likes: 833
From: melbourne florida
2023 C3 of the Year Finalist - Modified
What heads? Stock? I'd say you need an aftermarket 64cc heads to start. Depending on the other cam specs you may be bleeding off more compression than you can afford.
The cam would have been the last part I would have changed.
The cam would have been the last part I would have changed.
Last edited by 7t9l82; Nov 25, 2020 at 09:37 PM.
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Advanced
Joined: Oct 2020
Posts: 81
Likes: 9
your carb needs set up correctly it is killing your idle and off idle transition at 10 mpg put a fresh set of plugs in run the car till it gets to normal opperating temp dont touch the pedal let it idle and the shut it off check the plugs if the black its way to rich and that should be 80 percent of your problem, edl carbs are great carbs but they need set up corectly, get the edlb rod and jet kit make shure you get a vac reading before you take it it apart Edelbrock 1487 Edelbrock Performer Series Carburetor Calibration Kits | Summit Racing - Free Shipping on Orders Over $99 at Summit Racing
Carb Brochure#0033 (edelbrock.com) that carb needs tuned
Carb Brochure#0033 (edelbrock.com) that carb needs tuned
Advanced
Joined: Oct 2020
Posts: 81
Likes: 9
ti understood its new but it needs tunned i been doing this for 35 years the edlb and the new avs seris and all the holley they all need set up for your application the tuning kit is like 50.00 once you dial that in you will see a big improvement if you have 15 hg and thats ausome look at what the idle jetting is supposed to be in the link and see what it is in your carb it will take you 30 min to check it and see i bet if you hooked up a afr gauge you would probly see a way high rich condition at idle
Melting Slicks
Joined: Dec 2009
Posts: 3,195
Likes: 632
From: Thunder Bay
288/480 enginetech cam and I assume 8.5:1 or so comp. with flattop hyper-eutectic pistons. 487-x stock heads and exhaust. True duals with no emissions. Stock al. Intake with Edelbrock 1406 carb. Everything else stock 1979 L82. 15hg vacuum. Idles at 750 rpm in gear with very pronounced lope. Chirps tires from 1st to second at WOT. Just not much off the line but runs good with great throttle response. Thought there should be more...?
Thread Starter
Racer
Joined: Aug 2019
Posts: 253
Likes: 24
From: Oklahoma
When I began this project I had all intentions of the sbc trilogy,heads,cam and headers. As I went with a cam that is way to big for all the stock parts ,I was hoping for a little more umph while saving for the other parts. Your thoughts are probably spot on and maybe Santa will get me some more goodies. Thanks
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,809
From: Cool Northern Michigan
Do you remember installing a new crank sprocket with the new chain and new cam? Did the crank sprocket come with three options for the keyway to fit?
Straight up.
4* advanced
4* retarded.
You said it chirps tires at W.O.T. So it runs great above 4,000 RPMs. Its just doggy off idle 700 RPMs to 3,000?
Straight up.
4* advanced
4* retarded.
You said it chirps tires at W.O.T. So it runs great above 4,000 RPMs. Its just doggy off idle 700 RPMs to 3,000?
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,112
From: Crossville TN
Secondaries on your carb are likely not opening at all. Choke system must work and drop out to release the secondary lockout arm on your Q-Jet or you will only be operating on primary venturi. Also check to see that secondary throttle plates fully open when accel pedal is fully depressed. Exercising the carb throttle linkage does NOT simulate the pedal action.
Last edited by 7T1vette; Nov 26, 2020 at 09:55 AM.
Drifting
Joined: Mar 2006
Posts: 1,263
Likes: 188
From: Wabasha Mn
Advanced
Joined: Oct 2020
Posts: 81
Likes: 9
thus like 7t1 said tune your carb i know it is new but bolt on and go here dont apply, the cam you have is very close to the comp cams magnum cam i run the magnum cam in all my street sbc the cam runs great when the carb is tuned corectly yoiur secondary rate could very well be slow your dumping to much fuel, unlike a holley the edlb carbs use a combination of jets AND metering rods and springs to meter the fuel and time when and how fast the secondarys open you have really good vac (hg) for a cam with a duration around 230 - 240 range at .050 usualy that durration only makes around 7-10 so great there and the lift is under 500 so you have good velocity and are preventing fuel droplets from forming once you get it tunes you will love it
Drifting
Joined: Mar 2006
Posts: 1,263
Likes: 188
From: Wabasha Mn
Your cam description doesn't tell us much. I checked the engine tech website and didn't see a cam that matches your description. Regardless I will try and speculate on your problem. The biggest problem with the stock L82 engine was that the engine had too much camshaft for its compression. The solution is to increase the compression or install a camshaft with less duration. It sounds like you did the opposite and installed a cam with more duration. So, your solution is the same as for any L82 - increase compression or install a smaller camshaft. Until you do that, nothing is going to improve performance much.