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Limiters have 6000 chips in them and I'm up on them alot spinning 36's. This year we'll be lowering the gears in the lowers to 1:36 instead if the 1:50 and reprop again! Still looking for more!
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Originally Posted by Philm
(Post 3645054)
I spin my 598ci N/A with a hydraulic setup to 6000rpm all the time.
95% of my time running is between 3500 to 4000RPMs. 5 seasons so far without having a valve cover off (knocking on my wooden desk as I type!!) :D |
Originally Posted by MILD THUNDER
(Post 3645311)
Dyno sheet, valve springs, cam specs, lifter style, cylinder head model, etc
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if you paid for it, he should give you specs, maybe not every detail, but most!
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I spin my blown efi 509 to 6000 regularly and for one particular poker run every year, I step down in prop for better acceleration as there is a very long, winding river on the run and spin it to 6200 to 6300 on the straights. Sure sounds nice up there.
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The answer...it depends on the length of the stroke. The shorter the stroke, the more tolerant the BBC engine will be to increased RPM. Most of the Super Cat engines were 3.75 or 3.80 stroke and they raced at 7500 RPM...I think :drink:
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Originally Posted by OldSchool
(Post 3645325)
.
95% of my time running is between 3500 to 4000RPMs. :D |
fixx
Originally Posted by Baja_man
(Post 3645059)
So help me out here......and this may be more prop question than engine. My current engine has rev limiter set @ 5600 rpms....was stil make power all the way up till then but torque started to drop at 5300ish. My current prop i can only spin to 4900.....maybe 5000 if its over trimmed. This prop is in stock form. It doesnt make sense to me to be able to drop prop pitch and still be faster with a lower pitch prop but at only 4900 i am leaving 80+ hp on the table. Would i benefit from dropping pitch and running higher rpm?
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600" N/A tunnel ram BBC - 6800 RPM
Solid roller!:party-smiley-004: |
7,200 to 7,400.... 598s, 3.3 Whipples, Solid Roller! Had BPM 1.36 drives and 40 Pitch props. No more options at the time. Take out the chips and let her eat!!!:party-smiley-004:
http://www.youtube.com/watch?v=dZz74XZnFUA |
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