stall converter

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jglover_81

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I have a 72 scamp with a 440/727. Did some converter swapping and was supposed to have a 2400 stall. Took my car to the track for the first time last weekend and on the line all the brakes would hold was approximately 1500 rpm. Running down the track when I shifted the rpm dropped to 15-1800 rpm. Its a 9:1 440, lunatic .513 can 452 heads mildly ported holley street dominator intake 750 dbl pumper headers 3.25 gears. Had a guy tell me my converter would stall higher if I had more compression/HP. That didn't sound right to me just looking for a second opinion from the experts!
 
My plan is get a new converter next week but the guy just kept harping that the converter is fine its my lack of compression/power
 
Your "guy" is right, but you have what you have... :) More HP/tq make more stall. If the low end tune up is wrong, you may be giving away a lot of tq/hp where the engine is pulling through.

Foot stall is not the flash stall. When you nail the throttle and tires hook, what rpm does the engine jump to? Make sure the engine has plenty of initial timing. Get the timing squared away, both initial and total if you haven't already. Do you know those two numbers?

Buy the best converter you can afford. If you can get a good 9.5" converter, BUY IT!

Converter is the single most important piece in an automatic car, PERIOD!

Put a short tire, 25-26", on the car to make up for your lack of rear gear,
 
The total timing is 36° initial I believe is 16°. My regular street tires are 26" (295/50). When I nail the throttle the tires never hook it just smokes them but I have never felt a flash in the converter
 
x2 crackedback. I have a '72 Scamp, 383,727, 4.10:1 with 91/2" converter, 2800stall and 3200 flash stall. Your ring and pinion ratio is responsible for the r.p.m. drop between shifts. Most converters will hold between 1200-1400 rpm with brakes applied. then the engines torque overcomes the holding power of the brakes and the car pushes forward with the brakes locked. Solution:1. Line lock. 2. Come up on the converter with brakes locked, nail it and let the converter flash. 3. Leave the line at idle or just above and flash converter. We use Solution 3. With a 91/2 converter you're in for one hell of a ride. Good luck
 
The street dominator is a good intake, but you need more gear and converter to make it work with your combo.
 
My 2 things on my wish list are a 28-3200 stall converter and a set of 3.73 gears. I'm really not complaining about my car. First time to have it on the track and it ran a 11.16 in the 1000' at 92 mph and it spun 50' off the line.
 
jglover_81 said:
The total timing is 36° initial I believe is 16°. My regular street tires are 26" (295/50). When I nail the throttle the tires never hook it just smokes them but I have never felt a flash in the converter
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You don't "feel the converter flash", the flash stall (like CB said) is what the rpm jumps up to when you nail the pedal to the wood and the tires hook up. Since you say it doesn't hook up you'll never know what the stall is actually flashing to. If the engine is in proper tune and you get it too hook up it might stall 2400. In any event that's a real low rpm stall converter. As mentioned a "looser" converter will make it faster, providing you get the traction issue worked out. When you buy one don't buy an off the shelf converter, have one custom made for your cars specifications. Off the shelf converters will rarely stall what their advertised
 
Looks like I have a set of 4.10's I just have to go get them from the father in-law! Now for a converter!
 
jglover_81 said:
Looks like I have a set of 4.10's I just have to go get them from the father in-law! Now for a converter!
Click to expand...
When ordering your converter,give them all your engine specs,weight of car,tire size,new gear ratio.This is all important so you get the most from your car.:D
 
I have a set of 29x13.5 slicks. My car is for the most part a street car that I have taken to the track once. There are some issues I have to get worked out both with me and the car. I have drag raced ATVs for years but my nerves were shot once I put my baby on the track!
 
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