Side stepping the clutch

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340Dart

340Dart

Obsessive Dart Disorder
FABO Gold Member
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Location
Mount Morris, New York
How much ET do you lose? I have to take off at 5800 to 6000 so it dosn't bog. I've always been afraid to side step the clutch. I usually try to lift the pedal as fast as I can. I have a brand new Hayes clutch and I haven't been to the track since I put the RPM heads on. Do I need to worry? I run it at the track on slicks. The last time it was running 12.70's at 108.

Fred B
 
340 bored .030 KB pistons, assembly balanced. 10.2 compression, Edelbrock heads out of the box, Holley Strip Dom intake with 750 DP. MSD ignition, TTI headers and Mopar 508 cam. Running Dana 60 with 4.10's. I run this though the exhaust 3" with Hooker Max Flow muffs.

Fred B
 
Well I know one thing, The 509 cam I had in my 383, was a pig out of the hole. With a set of 4.56s in the rear, took right off, But couldnt keep the tires from spinning.With the 3.23s in the rear it was bad. Around 2500 rpm it started to pull like a bear.
 
Try some 4.56s or try a 3.08 first gear set. Do you have a heavy fly wheel to help get your car moving.
 
Mopower71 said:
Well I know one thing, The 509 cam I had in my 383, was a pig out of the hole. With a set of 4.56s in the rear, took right off, But couldnt keep the tires from spinning.With the 3.23s in the rear it was bad. Around 2500 rpm it started to pull like a bear.
Click to expand...

You may have a good point here. The 509 cam has a pretty long duration which moves the powerband up the RPM range. My 383 is balanced and has 11.5 to 1 compression. I have the MOPAR .528 lift/286 duration mechanical cam and it comes out of the hole like a crotch rocket when launched at 3500. Also, using solid lifters gives you the advantage of playing with valve lash a little to move the powerband up or down in the RPM range. You can't make a huge difference but you will notice it on timeslips.

Another consideration might be a smaller carb. The engine is going to pull a specific amount of air. One of the parameters that affects how quickly a carb goes full rich is the velocity of the air moving through it. The air will move though a larger carb at a lower velocity and if the carb is big enough it can delay the full-rich condition long enough to kill low end power and torque. If it is way too big the carb may never reach full-rich. A 750 isn't overkill on a 340 but a 650 may run much better, especially with a shorter duration cam.
 
Side stepping clutch pedal is a minimal gain if your foot is lighting quick. But it's a gain.
Just press, shift and slide the foot off in one motion.
 
i'd fix the bogging problem first.
whats your 60 ft time?
 
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