Re: Street engine in Daytona - what will it run?
[Re: 440Jim]
#2638485
03/29/19 02:11 PM
03/29/19 02:11 PM
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Joined: Jan 2003
Posts: 14,531 So. Burlington, Vt.
fast68plymouth
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“In theory”...... about 6.20.
Just shows that cubes and a big cam can only take you so far when the intake flow is limited. The tq number is really low for a 4.25 stroke(496 = 383 block +.060 with a 4.25 crank?)........ perhaps the cranking pressure is really just too low for the cam duration.
Seems like a set of TF270’s and a big intake would be worth about 100hp.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Street engine in Daytona - what will it run?
[Re: fast68plymouth]
#2638489
03/29/19 02:22 PM
03/29/19 02:22 PM
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Joined: Jan 2003
Posts: 10,091 MN
JERICOGTX
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I can't say exactly, but I'm sure with your knowledge, it will be an overachiever. Good luck with it Jim!
69 GTX
68 Road Runner
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Re: Street engine in Daytona - what will it run?
[Re: AndyF]
#2638544
03/29/19 04:53 PM
03/29/19 04:53 PM
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Joined: Jan 2003
Posts: 19,537 Las Vegas
Al_Alguire
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Car is a lot heavier than I figured it would be.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Street engine in Daytona - what will it run?
[Re: AndyF]
#2638545
03/29/19 04:58 PM
03/29/19 04:58 PM
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Joined: Jan 2003
Posts: 16,936 NC
440Jim
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This is an RB block, 4.15 Eagle crank, 4.36 bore engine (sheet says 4.363)
The weight-power equation I use for guessing shows 9.85 in the quarter mile, and 6.25 in the eighth. With a powerglide and that torque number, I don't know how close that will be. I also don't have any other engine dyno curves to compare, just using the peak HP number in the calculation.
This car was setup with a powerglide, and since it came with the shifter, driveshaft, trans crossmember, etc; I am going to buy a PG for it also. I decided to dyno the new build since I had no idea what power it would make, and wanted something to give the torque converter manufacturer to build one for me.
The engine only changed small amounts with spark advance changes, carb swap, jet changes, and carb spacers. That last run with adding the 1/2 open spacer under the 4 hole tapered 1", was the biggest change. It added 6 hp at peak, and about 10 at each rpm past peak. It also leaned the oxygen sensor reading from 11.7 to 12.5. The carb O2 was always pretty constant from 4000- 6400, but was amazing constant with that carb spacer combo. Basically 12.5 below torque peak, 12.4 around peak torque, and back to 12.5 approaching peak HP and higher.
Those heads must be a real restriction. And maybe that is why the engine was so insensitive to changes.?
Last edited by 440Jim; 03/29/19 05:28 PM. Reason: added jet changes, small impact
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Re: Street engine in Daytona - what will it run?
[Re: Al_Alguire]
#2638547
03/29/19 05:03 PM
03/29/19 05:03 PM
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Joined: Jan 2003
Posts: 16,936 NC
440Jim
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Car is a lot heavier than I figured it would be. I haven't weighed it yet, that is what the previous owner told me. It has the factory steel doors, steel hatchback, rear bumper, factory dash (nice), etc. One of the heavier Daytona chassis cars I looked at. But I liked the workmanship, all round tube, and even the paint scheme!
Last edited by 440Jim; 03/29/19 05:08 PM. Reason: weight info
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Re: Street engine in Daytona - what will it run?
[Re: AndyF]
#2638549
03/29/19 05:06 PM
03/29/19 05:06 PM
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440Jim
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Should be fast enough to have some fun. When you want to step it up just buy some Trick Flow heads and unleash the beast....... If I get bored with the track performance, the short block is a good starting point with crank, rods, pistons. Take off the 88cc heads, put some decent flowing aluminum 72cc heads, and presto... 12 CR. Even leave the cam alone.
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Re: Street engine in Daytona - what will it run?
[Re: 440Jim]
#2638550
03/29/19 05:08 PM
03/29/19 05:08 PM
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Joined: Nov 2011
Posts: 291 PA
Harry's Taxi 2
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with a 3-speed proper working converter, 5.98 1/8 9.59-142mph 1/4
I just read that was a PG.....+.10 in the 1/8 at least
Last edited by Harry's Taxi 2; 03/29/19 05:15 PM. Reason: just read that it was power glide
'86 Maple Grove KOS Mopar low qualifier......true street legal with no power adders.
NOS-used when losing since 1940.
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Re: Street engine in Daytona - what will it run?
[Re: 440Jim]
#2638552
03/29/19 05:13 PM
03/29/19 05:13 PM
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Joined: Dec 2005
Posts: 12,289 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
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9.70. Optimize the gear for 1/8 mile and you might sneak it into the 5s on a good day.
4 link?
Last edited by CMcAllister; 03/29/19 05:14 PM.
If the results don't match the theory, change the theory.
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Re: Street engine in Daytona - what will it run?
[Re: 440Jim]
#2639163
03/31/19 12:13 PM
03/31/19 12:13 PM
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Joined: Jan 2003
Posts: 4,448 Phoenix, AZ
MoparBilly
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Phoenix, AZ
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Jim Very similar weight, and gear to my old Challenger. My old Eddie 440 had little less TQ and HP, but I finally managed a 9.96-134 playing with gear and converter mainly.
What I learned over the years with that combo:
You need a converter that will keep the engine in the meat of it's torque curve the longest. I had an 8 inch 5500 stall that would flash to 5400 at the hit, and drop to 5250 on the shift to drive. I had a 9 inch 5000 stall that would flash to 5100 at the hit, and drop to 5000 on the shift to drive. The engine would go through the traps at 6400 regardless of whether it got there at 1150 feet or 1280 feet, that's all it had. The 9 inch was a tenth or better than the 8 just about anywhere except Denver!
I preferred a low gear set glide...always better '60 than a 1.76
Great looking machine, the extra weight is fine since it makes for a nicer car.
"Livin' in a powder keg and givin' off sparks"
4 Street cars, 5 Race engines
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