Mild 470 street / strip motor on the dyno
#2392408
10/24/17 04:31 PM
10/24/17 04:31 PM
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Joined: Mar 2006
Posts: 2,686 Mt. Eden Ky.
Hemi Allstate
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I built this engine years ago to put in my mother's 68 road runner in place of the original 383. It has been on the stand for a long time as garage art. LOL It has now been 10 years and I wanted to see what it makes for HP and torque. So, it went on the dyno yesterday. The rotating assy is 440 Source, Ross pistons, the block zero decked, Edelbrock RPM heads were checked out and had some minor bowl work. Rockers are Comp Pro Magnums, Edelbrock Performer RPM intake, gasket matched . The Comp Cam XE282 S solid FT, Smith Bros. push rods. The cam was from Dwayne Porter and specked for the 3.23 gear and original RR torque converter. I chose a Quick fuel 780 SS carb with vac. secondaries . I also took with me my Race Demon RS 1050 carb to test. I calculated 10.73 -1 compression and ran the test on pump gas. I really wasn't sure what to expect for output, and I think it did pretty well. What would be decent HP and torque numbers for this mild build ? I will post the results later. Thanks, Mark
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Mild 470 street / strip motor on the dyno
[Re: krautrock]
#2392415
10/24/17 04:49 PM
10/24/17 04:49 PM
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Joined: Mar 2006
Posts: 2,686 Mt. Eden Ky.
Hemi Allstate
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I guess it would help to post the cam specs.
244* intake 252* exh. @ .050" .520 int .540 exh. 110 Lobe sep Howard's EDM lifters
Last edited by Hemi Allstate; 10/24/17 04:51 PM.
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Mild 470 street / strip motor on the dyno
[Re: Hemi Allstate]
#2392439
10/24/17 05:38 PM
10/24/17 05:38 PM
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Joined: Jan 2003
Posts: 14,531 So. Burlington, Vt.
fast68plymouth
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I'd be looking for "around" 540hp/560tq, based off what I've seen from similarly built 446's, and adjusting for the added cubes.
I was talking to a friend of mine while we were dynoing a 505 he built for a customer about how there can be a fairly noticeable difference in what the dyno sheet says depending on where you go.........for a host of different reasons.
He reminded me of a 2bbl circle track motor he had years ago that he had tested, completely unchanged, at 3 different shops. The high to low spread was about 30hp......on a motor that barely made 300hp.
It was something like 285/300/315.
Edit- I see you'll be running an elec water pump..... So add a few for that.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Mild 470 street / strip motor on the dyno
[Re: AndyF]
#2392512
10/24/17 07:59 PM
10/24/17 07:59 PM
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Joined: Mar 2006
Posts: 2,686 Mt. Eden Ky.
Hemi Allstate
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It has been years since I had an engine on this dyno, but it was not at all generous with the numbers on the two Hemi engines I put on it in the past. In fact I was really disappointed with the out come on both of those engines. I hear what you guys are saying, and I am just going to post what I have. Maybe you can look at the information and share your observation of the data. I am glad to learn from your experience. Andy, I have your book and read about your cam testing on the 470, with exhaust manifolds. These dyno headers were 2" diam. and I am going to use 1 7/8" TTI headers.
Mark
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Mild 470 street / strip motor on the dyno
[Re: Hemi Allstate]
#2392543
10/24/17 09:07 PM
10/24/17 09:07 PM
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Joined: Jun 2006
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GTX MATT
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That cam seems to produce really strong flat torque curves and "overachieve" a little on HP. I think the guesses given so far, 530-540 HP and 560-570 ft lbs are right on. I've seen a few dyno results for stock stroke engines with this cam and they seem make about 520 HP and 540 ft lbs.
At first glance it looks a little small for a solid cam using the old rule of thumb of 6-8 degrees of the .050 number for a solid vs hydro. The lash on those XS lobes is tighter than alot of other cams though, so I think its a little deceiving.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: Mild 470 street / strip motor on the dyno
[Re: GTX MATT]
#2392604
10/24/17 10:25 PM
10/24/17 10:25 PM
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Joined: Mar 2006
Posts: 2,686 Mt. Eden Ky.
Hemi Allstate
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I asked the shop owner for his estimate, as well as the dyno operator just for the fun of it. The shop owner said 550, the dyno operator guessed 550 to 570, based on similar sized BBC engines he had tested with "good" heads. Here are the results. First is Demon 1050 The second is the Quick fuel 780 carb. Last is Demon 1050 Mark
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Mild 470 street / strip motor on the dyno
[Re: davenc]
#2392651
10/24/17 11:40 PM
10/24/17 11:40 PM
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Joined: Mar 2006
Posts: 2,686 Mt. Eden Ky.
Hemi Allstate
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Yes the quick fuel was leaned out 2 numbers front and 4 on the rear. I would have to do some checking to see the actual sizes.
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Mild 470 street / strip motor on the dyno
[Re: Hemi Allstate]
#2392654
10/24/17 11:44 PM
10/24/17 11:44 PM
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Joined: Jan 2003
Posts: 14,531 So. Burlington, Vt.
fast68plymouth
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So. Burlington, Vt.
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About all I can come up with is...... Great call on the cam choice
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Mild 470 street / strip motor on the dyno
[Re: fast68plymouth]
#2392687
10/25/17 12:47 AM
10/25/17 12:47 AM
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Joined: Mar 2006
Posts: 2,686 Mt. Eden Ky.
Hemi Allstate
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About all I can come up with is...... Great call on the cam choice I am inclined to agree Dwayne. Thanks, Mark
Last edited by Hemi Allstate; 10/25/17 12:47 AM.
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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