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#1
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what do you guys think my dart will run
hello everyone.what do you guys think my dart will run in the 1/4 mile? it is a 72 dart swinger with a 8 3/4 rear with 4.88, frame connectors,cal tracks with there springs.727 trany with a 4200 stall converter the engine is a 340
Work done: O-ringed, tubed for roller cam, oil gallies enlarged, bored to 4.07 (.030 over) and honed with deck plates by Herb McCandless. 340 steel crank Prepared by Lunati, stroked .110 to 3.42 stroke and balanced to 8000 rpm's.im planning on shifting at 7200. 340 steel rods Prepped by Lunati. Hand picked set. All are within .001 of each other in length. Bronze bushed, balanced and lightened. Heads 340 X heads with 2.08 intake valves and 1.60 exhausts. Double springs for .700 lift cam, Maximum porting on intake and exhaust ports.Ports are 63cc combustion chambers. heads flow a little over 260 cfm. Pistons Venolia lightweight forged pistons. Uses dykes top ring, 1/16 2nd ring and standard tension oil rings. Weight is 510 grams.the Compression is 11.3 Intake Holley Strip Dominator ported to match heads.850 carb Camshaft Cam Motion roller 269 275 @ .050 and .631 lift with 1.5 rocker Valves set on .024 .028 RPM range 4500-7500. Cam is degreed in at 104 deg centerline. Other Parts High volume Melling oil pump, Comp Cams roller lifters, Crane 1.5 roller rockers(gold), Fluid Balancer, windage tray, Cloyes double roller timing set. SCE copper head gaskets(.060). Tall valve covers for use with roller rockers. Moroso 8 qt deep sump oil pan. Bronze cam gear for use with roller cams thanks im hoping for 11's |
#2
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Don't press teh gaspedal to the floor, or your hopes may not come true; it might go 10's instead. If the combination works right like I think it should, and the chassis works, 11's should be a piece of cake on a good track.
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#3
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Any weight reduction to the car?
I think it'll run 11's, BUT I think depending on tires size you have too much gear. You may find yourself running out of revs. my .02 |
#4
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the tires are 28'' and i have been worried about running out gear too.How can i tell what rpm i will be running when i cross the line?With any given gear or tire size. thanks
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#5
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With 5% converter slippage
6000 = 98 mph 6500 = 106 7000 = 114 7500 = 122. According to one calculator, wtih enough power to run 98 mph in the 1/4 miles should provide 13.9 sec ET 106 = 12.85 114 = 11.95 122 = 11.2 I believe these numebrs are for average chassis and drivetrains. |
#6
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can i get a converter with 0% slippage.thanks
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#7
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what do you guys think it will run with a 150 or 200 shot of nos.thanks
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#8
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Lock up converters have 0% slippage, but a regular high performance doesn't. Seems like you could use a longer gear ratio, I wouldn't feel comfortable rewing that kind of an engine much past 7000. 4.4-4.56 might be about right, but you'll see after trying it out. The NOS doean't cure that problem, nitrous likes even longer gear ratios than naturally aspirated engines. If your engine is good, it should make around 450-500 horsepower; of course adding 30-40% above that will make the car perform considerably better. that is, if it can handle the added power.
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#9
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70 Cuda
340 + 0.020, + 3.454 stroke =357. 10.3:1 compression ratio, pump gas, mildly ported "U" T/A head, Six Pack, MP distributor, TTI header, MP 284/484, 10"converter, 3.55 :1 gear, 28x10.5 MT ET Street on steel rims, 3650lbs, = 12.79 @103mph Your Dart should go a lot faster! |
#10
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1/4 Time
69 Dodge Charger
360 +.030 11.7:1 Speed Pro Pistons w/ C&A Rings 6.123 Rods Shot peened and magnafluxed 3.58 Stock crank cut .010/.010 w/ Clevite Bearings 360 "J" Heads cut .030 1.78/1.50 w/ 3-angle valve job Mopar 1.5 Rockers Comp Cams single springs and retainers MP Purple Shaft 292/509 w/ 248@ .050 installed straight up Cloyes Double Roller timing chain SFI Damper Edelbrock Performer #2176 Port Matched 750cfm Race Demon 78/88 jets Holley Blue Pump w/ Regulator and 1/2" LIne RCI 8-Gal Fuel cell in trunk 1 5/8 Summit Headers (FREE) w/ 3" Collectors (soon to be 1 7/8") 18" Collector Extensions MP Distributor w/ Lightweight Springs MSD 6AL w/ 2-step adapter Accel 8.8 Wires Hurst Line-Loc Electric Water Pump w/ Twin Flexalite Fans 727-A Transmission TCI Reverse Pattern Valve Body TCI Aluminum anodized shifter TCI 10" Convertor 3800 stall Kevlar Bands and Clutches HD Sprag Weld Pro-Stars 15x10 and 15x3.5 M/T ET Drags 29.5x10.5/15w 8 3/4 Axle Narrowed 6" Stock axles cut and resplined, green bearings 4.88 Richmond gears Strange Lightweight Spool Springs already moved inwards 4" Aluminum Tubs already installed w/ Room for 15" tire clearance Best ET: 12.77 @ 106 Texas Motorplex Ennis,Tx Launch: 2200 1-2 shift : 6200 2-3 shift : 6200 Trap RPM : 6800 Thats just my scenario with 4.88's. Hope it gives you an idea for your setup |
#11
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thanks for the replys looks like im going to think about geting some new gears.
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#12
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Drive it first at the track, and decide about the gears after that.
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#13
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im thinking the 4.56 will get me to 123 mph at a little over 7000 rpm but the 4.88 will give me only 113.so im thinking the 4.56 will be a better gear.
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#14
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the 4.56's will not give you 123 mph in the 1/4 mile, the power will. At the moment I believe you don't know where your engines powerband is. Running a 1/4 mile is not a trap speed race, you are running there for ET Even if you run out of ratio with the 4.88's and the speed wouldn't be quite as much as with teh 4.56's, the car might still be quicker because it accelerates quicker from standstill. It's a competition based on average speed, and the trap speed has got very little to do with it. Since you already have the rear and the gears in it, I would first test it, and then change the gear ratio. Installing 4.56's now is a shot in the dark; maybe it's 4.30's you need, or something else.
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#15
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I agree that deciding on a gear set now may be a "shot in th dark" but in the same breath, if we truley believe this is a low 11 second car, then the mph will be in the high 100 teens.
You said in your first post, that you are running an 8 3/4. I would see what gears you can borrow in the 410 to 456 range, and go that way. I think starting out with 488's may be a bit much. It just doesn't work mathematically. my.02 |
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