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  #1  
Old 09-04-2008, 04:29 AM
daves 72 dart daves 72 dart is offline
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Location: cedar falls iowa
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Posts: 106
Default 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
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  #2  
Old 09-04-2008, 08:37 AM
DartGT66 DartGT66 is offline
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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  
Old 09-04-2008, 11:36 PM
dave5711 dave5711 is offline
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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
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  #4  
Old 09-05-2008, 02:27 AM
daves 72 dart daves 72 dart is offline
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Quote:
Originally Posted by dave5711 View Post
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
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  
Old 09-05-2008, 05:32 AM
DartGT66 DartGT66 is offline
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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.
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  #6  
Old 09-05-2008, 05:39 AM
daves 72 dart daves 72 dart is offline
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can i get a converter with 0% slippage.thanks
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  #7  
Old 09-05-2008, 05:49 AM
daves 72 dart daves 72 dart is offline
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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  
Old 09-05-2008, 08:27 AM
DartGT66 DartGT66 is offline
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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  
Old 09-05-2008, 11:29 AM
aarracer aarracer is offline
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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!
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  #10  
Old 09-07-2008, 10:07 AM
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slow2dak slow2dak is offline
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Join Date: Nov 2002
Location: Midlothian, Texas
Age: 43
Posts: 51
Default 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
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  #11  
Old 09-07-2008, 05:56 PM
daves 72 dart daves 72 dart is offline
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thanks for the replys looks like im going to think about geting some new gears.
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  #12  
Old 09-08-2008, 02:06 AM
DartGT66 DartGT66 is offline
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Drive it first at the track, and decide about the gears after that.
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  #13  
Old 09-09-2008, 05:56 AM
daves 72 dart daves 72 dart is offline
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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  
Old 09-09-2008, 08:02 AM
DartGT66 DartGT66 is offline
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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  
Old 09-09-2008, 11:24 PM
dave5711 dave5711 is offline
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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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