Mudbone Posted January 31, 2017 Share Posted January 31, 2017 My brother gave me these two photos of a dragster with a Nailhead engine. He said it was taken somewhere between 1959-1963, as he raced his 58 Ford at that racetrack. 6 Link to comment Share on other sites More sharing options...
NTX5467 Posted March 26, 2017 Share Posted March 26, 2017 "TV" Tommy Ivo was a famous Nailhead dragster racer. Some of his dragsters had more than one Nailhead, as I recall. At a time when there were more shadetrees than now AND people that used to work under them, building or tuning on their cars, engines from the "higher carlines" were desired for their larger displacements and power PLUS their stronger rear axles. Pretty nice dragster in that picture! NTX5467 Link to comment Share on other sites More sharing options...
RivNut Posted March 27, 2017 Share Posted March 27, 2017 (edited) Tommy had single, dual, and quad nailhead engine dragsters, as well as his infamous T Bucket. The nailhead was infamous for it's small exhaust valves. Really made getting the engine hard to breathe. Here's one guys attempt to overcome that. Force the fuel through the small exhaust valves then exhaust them through the larger intakes. Edited March 28, 2017 by RivNut (see edit history) 2 Link to comment Share on other sites More sharing options...
Brad Conley Posted March 28, 2017 Share Posted March 28, 2017 (edited) 8 hours ago, RivNut said: Tommy had single, dual, and quad nailhead engine dragsters, as well as his infamous T Bucket. The nailhead was infamous for it's small exhaust valves. Really made getting the engine hard to breathe. Here's one guys attempt to overcome that. Force the fuel through the small intake valves then exhaust them through the larger intakes. Close Ed...Force through the EXHAUST valves, exhaust through the INTAKE valves. We knew what you meant... :-) Edited March 28, 2017 by Brad Conley got it bass-awards myself! (see edit history) Link to comment Share on other sites More sharing options...
Brad Conley Posted March 28, 2017 Share Posted March 28, 2017 bass-akwards. Darn auto-correct! Link to comment Share on other sites More sharing options...
RivNut Posted March 28, 2017 Share Posted March 28, 2017 1 hour ago, Brad Conley said: Close Ed...Force through the EXHAUST valves, exhaust through the INTAKE valves. We knew what you meant... :-) Thanks, I only wish my wife knew what I meant.......? Link to comment Share on other sites More sharing options...
Beemon Posted March 29, 2017 Share Posted March 29, 2017 I always thought it was kind of interesting when people refer to engines breathing. I just finished a numerical methods class where I modeled the primary bores of a Rochester 4GC on a 1956 322, using internal venturi volumes, cubic inch displacement, bore and stroke. The ability for the engine to breath is based solely on the pumping action of the piston on the intake stroke. The only thing the intake valve influences is intake turbulence and intake velocity. The engine will only pump what it needs based off CID, and the smaller valves will actually increase the volumetric flow rate due to Bernoulli's Equation, where the change in cross sectional area increases flow velocity if density and pressure are kept constant. Nailheads in essence, flow very well due to higher intake velocities, they just don't flow like Chevies. 1 Link to comment Share on other sites More sharing options...
MrEarl Posted March 30, 2017 Share Posted March 30, 2017 16 hours ago, Beemon said: I always thought it was kind of interesting when people refer to engines breathing. I just finished a numerical methods class where I modeled the primary bores of a Rochester 4GC on a 1956 322, using internal venturi volumes, cubic inch displacement, bore and stroke. The ability for the engine to breath is based solely on the pumping action of the piston on the intake stroke. The only thing the intake valve influences is intake turbulence and intake velocity. The engine will only pump what it needs based off CID, and the smaller valves will actually increase the volumetric flow rate due to Bernoulli's Equation, where the change in cross sectional area increases flow velocity if density and pressure are kept constant. Nailheads in essence, flow very well due to higher intake velocities, they just don't flow like Chevies. Now add a McCulloch Supercharger for extra credit. Great post btw,'til the last half sentence, then it went south. 2 1 Link to comment Share on other sites More sharing options...
Ttotired Posted May 20, 2017 Share Posted May 20, 2017 On 30/03/2017 at 3:36 AM, Beemon said: I always thought it was kind of interesting when people refer to engines breathing. I just finished a numerical methods class where I modeled the primary bores of a Rochester 4GC on a 1956 322, using internal venturi volumes, cubic inch displacement, bore and stroke. The ability for the engine to breath is based solely on the pumping action of the piston on the intake stroke. The only thing the intake valve influences is intake turbulence and intake velocity. The engine will only pump what it needs based off CID, and the smaller valves will actually increase the volumetric flow rate due to Bernoulli's Equation, where the change in cross sectional area increases flow velocity if density and pressure are kept constant. Nailheads in essence, flow very well due to higher intake velocities, they just don't flow like Chevies. So much more than that Consider valve timing, engine speed in relation to actual time the valve is open ect ect Larger valves aid in getting the gasses in and out (flowing) Smaller valves give higher gas speed, but less volume, kind of like a garden hose to a fire hose. You can get your garden hose to squirt water as far as a fire hose, but it will never deliver as much water. Of coarse actual engine displacement also determines how much gas it can actually pump, but if the valve is to small, at higher rpm, the valve will not allow the actual rated amount of gas to enter the cylinder, purely because there is not enough time for the gasses to get in and out. 2 Link to comment Share on other sites More sharing options...
Rooster Posted July 4, 2017 Share Posted July 4, 2017 4 Link to comment Share on other sites More sharing options...
RivNut Posted July 4, 2017 Share Posted July 4, 2017 Hmmmmm. Only 14 exhaust pipes coming out of that center row. Link to comment Share on other sites More sharing options...
smithbrother Posted July 6, 2017 Share Posted July 6, 2017 I count 16 from lower picture. Dale in Indy Link to comment Share on other sites More sharing options...
telriv Posted August 30, 2017 Share Posted August 30, 2017 There was no room for 16 going up. Two HAD to go down in the middle. 1 Link to comment Share on other sites More sharing options...
MRJBUICK Posted June 15, 2018 Share Posted June 15, 2018 Thats alot of pipes pointed in the drivers direction Link to comment Share on other sites More sharing options...
ted1922 Posted November 3, 2019 Share Posted November 3, 2019 Back in the early 60"s in So- Cal Jim Morris use to drag race his 1925 Buick . 1 Link to comment Share on other sites More sharing options...
avgwarhawk Posted November 4, 2019 Share Posted November 4, 2019 On 3/27/2017 at 12:19 PM, RivNut said: Tommy had single, dual, and quad nailhead engine dragsters, as well as his infamous T Bucket. The nailhead was infamous for it's small exhaust valves. Really made getting the engine hard to breathe. Here's one guys attempt to overcome that. Force the fuel through the small exhaust valves then exhaust them through the larger intakes. That is insane. Ingenious but insane! Link to comment Share on other sites More sharing options...
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