7K RPM Flathead?
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Post Fiend
Joined: Sep 2004
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From: Near Fresno, California
7K RPM Flathead?
My friend Phil H has emailed me some more about his 1950's racer - he said, "I was able to run the engine at around 7000 RPM, partly due to the fact that it was on 60 percent nitro which only needed about 2 parts of air to 1 part of fuel. That pretty well handles the old theory that a flathead can't breath above 5500."
Anybody else have any experance with high RPM flatheads?
Anybody else have any experance with high RPM flatheads?
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From: commerce city co
kens and leslie had one years ago but they fabed a girdle to hold the crank offy 4 duec set and overhead valve conversion they had it on display at the shop just before they closed up the shop bout ten years ago.
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From: SoCal
Originally Posted by ALBUQ F-1
I wouldn't want to be around any 3-main-bearing engine turning 7k
It really doesn't prove that a flathead can breath, since he was skirting the problem by pumping oxygenated fuel in.
It really doesn't prove that a flathead can breath, since he was skirting the problem by pumping oxygenated fuel in.
Last edited by TheSovereign53; Sep 9, 2006 at 12:53 AM.
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From: commerce city co
they ran it once from what my dad told me the put it i an altered and first trip was running about 140 at 3/4 th the way thruog the quarter and lost it and hit the wall .the guy scrapped the car and sold the engine back to them.
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From: Erie, pa
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Post Fiend
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From: Near Fresno, California
He used that same engine for 4 years - but it was circle track racing so no telling how often he rapped it tight. I understand that Barney Navarro also ran a 180 flatcrank on nitro, I think that '27 is in the NHRA Museum in Pomona. Maybe one of the socal brothers can confirm that.
I don't think there was much stock left in the engine - they ran different cranks, cams, pistons, and rods. The valves were oversized, and the firing order changed to keep the center cylinders from interfering with each other.
I don't think there was much stock left in the engine - they ran different cranks, cams, pistons, and rods. The valves were oversized, and the firing order changed to keep the center cylinders from interfering with each other.
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From: commerce city co
in the 80 there a 34 hiboy with a 671 blown flat head covered by hot rod that set a buch of records at datona speedway back in the day they had hop up parts for those old flat heads as ***** b mentioned. there was many records set with those old flat heads that wasnt beat until the 70s and 80s but the flat went away becace the modern v8 became alot cheaper to hop up and more avalible.
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