FE Power Forums
FE Power Forums => FE Technical Forum => FE Engine Dyno Results => Topic started by: CaptCobrajet on January 16, 2017, 12:25:07 AM
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Street 390 build, CP pistons with four valve reliefs. I milled the heads to net 10.5 static compression. BBM heads with my "standard" $400 hand port upgrade, RPM manifold with port-match and plenum mods. Holley 830 Annular carb. 232/238 @ .050 on a 12, .580 lift hydraulic roller. Non-adjustable OEM rockers with heavy duty shafts and studs.
The block had been a Jasper engine at some point and had a .040 tag on it. We honed it correctly to .050, drilled up the oil galleys and did normal mods, align hone, deck, etc. No exotics, just attention to details. Here's what she did:
RPM TQ HP
3000 461 266
3500 463 308
4000 497 379
4100 502 392.7
4200 504 402.5
4300 506 415.2
4400 506 423.8
4500 504 432.3
4600 506 442.9
4700 508 454.5
4800 506 461.8
4900 505 470.5
5000 504 479.7
5100 504 489.1
5200 502 497.7
5300 495.9 499.5
5400 489.3 503
5500 484.4 507
5600 481.8 514
5700 479.5 520
5800 473.6 523
5900 467.5 525
6000 462.5 528
6100 457 531
6200 449 529
6300 439 527
6400 430.4 524
6500 423 524
It had the 5325 Morels. No short travel. I wanted to turn it higher just to see the curve over the top, but we were running out of time, and we found peak HP there at 6100. With the non-adj rockers and beehive springs, it never missed a beat at 6500. I suspect it had another 200-300 clean rpm left, because it showed no signs of struggle or fuel curve issues at 6500. I thought the very flat torque band was notable.
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Very impressive sounds to me your little lovin in the port work was the ticket. Nice to see these numbers on less than 400 cubic inches
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Good good.... hope you don't mind, I'm going to be linking this in the future when some yahoo on another group brags about his 500+hp 390 with iron heads and an rv cam.
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That's pretty neat...
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What intake valve did you go with on the heads ? 2.200 or 2.150
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2.200
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Thanks for passing that along! Looks like an easy and inexpensive to build FE!
Lou
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Was that on the factory crankshaft ?
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Yes sir. Cast 390 cranks are tough tough.
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Thanks for the relieve . I'll give you a call when I get ready to buy some parts from you
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Street 390 build, CP pistons with four valve reliefs. I milled the heads to net 10.5 static compression. BBM heads with my "standard" $400 hand port upgrade, RPM manifold with port-match and plenum mods. Holley 830 Annular carb. 232/238 @ .050 on a 12, .580 lift hydraulic roller. Non-adjustable OEM rockers with heavy duty shafts and studs.
The block had been a Jasper engine at some point and had a .040 tag on it. We honed it correctly to .050, drilled up the oil galleys and did normal mods, align hone, deck, etc. No exotics, just attention to details. Here's what she did:
RPM TQ HP
3000 461 266
3500 463 308
4000 497 379
4100 502 392.7
4200 504 402.5
4300 506 415.2
4400 506 423.8
4500 504 432.3
4600 506 442.9
4700 508 454.5
4800 506 461.8
4900 505 470.5
5000 504 479.7
5100 504 489.1
5200 502 497.7
5300 495.9 499.5
5400 489.3 503
5500 484.4 507
5600 481.8 514
5700 479.5 520
5800 473.6 523
5900 467.5 525
6000 462.5 528
6100 457 531
6200 449 529
6300 439 527
6400 430.4 524
6500 423 524
It had the 5325 Morels. No short travel. I wanted to turn it higher just to see the curve over the top, but we were running out of time, and we found peak HP there at 6100. With the non-adj rockers and beehive springs, it never missed a beat at 6500. I suspect it had another 200-300 clean rpm left, because it showed no signs of struggle or fuel curve issues at 6500. I thought the very flat torque band was notable.
Blair,
I missed this one, Chilly told me about it.
The Gonkulator is coming in a couple percent high vs the dyno.
A couple questions if you recall:
1. Was the engine driving the water pump, or electric? Overdriven (428 A/C style) or underdriven (352 style)
2. Can you describe the exhaust?
My usual Gonkulator guess for your dyno exhaust is 2x33 headers into 3.5" collectors, maybe 18", then open exhaust.
Thanks
Werby
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Electric water pump. 3.5 merge collector. Headers are 32-33 inches.