Re: What do you think a good HP/CI is for a street/strip engine?
[Re: rb446]
#2705539
10/10/19 02:01 PM
10/10/19 02:01 PM
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Joined: Jan 2003
Posts: 2,094 central texas
krautrock
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,094
central texas
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in a build like this, would the trick flow 240 heads make much difference? [
All depends on what level the Eddy's have been prepped to and the cam lift used. TF claim their 240 head flows 318cfm@.550", ootb Eddy's are around 271@.550 if your lucky, also 78cc for TF's and if 84cc eddy's were used on that build it could screw up the CR if already on the limit for p/gas......my 2c's. basically, going with the philosophy of In the end, I think this still comes down to an individual's opinion on what "good" street is. I like my cars to be very mild mannered on the street, and I usually shoot for 1.10 to 1.15 on an engine dyno. You can build it with parts from Summit, and stuff it in a car with a stock-ish torque converter and a 3.23 gear. low deck 451 M1 single plane intake (swap to performer RPM if the single plane is annoying) cam like a mopar 528 solid ie. ~240@050" - 112LSA 1-7/8 headers can make a piston choice to have the motor be roughly 10.4:1 with either heads go with the smaller port heads and save some money, go with the trick flow with bigger ports and better flow...for a hot street motor, that will see the strip occasionally. gain much torque down low with the RPM heads? gain much power up top with the PP240, maybe still have as much torque down low??
Last edited by krautrock; 10/10/19 02:03 PM.
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Re: What do you think a good HP/CI is for a street/strip engine?
[Re: krautrock]
#2705563
10/10/19 03:04 PM
10/10/19 03:04 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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I’m sure there would be a difference....... how much? Only way to know is do the test.
When the TF 240’s came out, on their 600hp test mule I thought they said their heads were better than the RPM’s by 30hp. That was ootb heads, on a motor that made 85hp more than the one we just ran. This one had very mildly reworked heads, and less hp/ci....... so I’d expect the gap to be lower than 30hp....... but that’s pure speculation.
It wouldn’t surprise me if you did the test on a bigger cube motor with a bigger more aggressive cam that you could get the difference between ootb RPM’s and ootb TF240’s to be over 50hp. Then, on an 8.5:1 383 with a stock replacement magnum cam and an old dp4b with a 600vs carb, there might not be any difference.
The motor that was on the dyno yesterday was something I originally built in 2004, that had a problem with one lifter bore. The lifter bore was repaired, the heads freshened up, solid cam out, hyd roller in.
The heads on it flow 290/217@.600.
Had it been built from scratch today, it might have gotten different heads.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: What do you think a good HP/CI is for a street/strip engine?
[Re: krautrock]
#2705571
10/10/19 03:17 PM
10/10/19 03:17 PM
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Joined: Oct 2009
Posts: 1,267 North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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My pump gas small block dynoed 662 hp at 394 ci. That is 1.68 hp per ci. It was dynoed on super unleaded. I have never ran anything but super unleaded in it. I have thought about running 110 in it and raising the timing to where Brett told me to put it. I don't trust the pump gas enough to raise it. It is raced with the Drag Radials and mufflers just like it is street driven.
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: What do you think a good HP/CI is for a street/strip engine?
[Re: AndyF]
#2706038
10/11/19 08:55 PM
10/11/19 08:55 PM
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Joined: Dec 2013
Posts: 4,704 Wichita
GY3
master
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master
Joined: Dec 2013
Posts: 4,704
Wichita
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The cnc ported Stealth heads on my 505 flow almost identical to the TF 240's.
I'm really enjoying this combo with the mild hydraulic roller, 10.3:1 CR, 11" converter and 3.54 gears.
I drive it to work when the weather is nice, cruise it all over, run pump gas and it really requires very little maintenance.
I have well over 6,000 miles on it and it is super consistent! When I run it n/a at the nostalgia events, it runs within 2 hundredths all day long! I have two 1st and one 2nd place finishes this season racing. At one event we were running 104 mph in the 1/8th mile all day on a small shot of nitrous.
Last edited by GY3; 10/11/19 09:00 PM.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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