sharp 90 degree turns in head and intake ,

bock

Member
why so many sharp corners in my oliver 5 sharp 90s from carb to
intake valve, would think it would hard to get much scavenging
through all that , i geuse it helps mix air and fuel together though ,
 

You are on the edge of a great truth. Turbulence of required to keep the air/fuel mixture suspended without ponding in the manifold and ports.
This is why a smooth mirrored polished intake manifold and head ports is not a good physics. A rather rough finish polish is better.
They put dimples on a golf ball for a reason instead of making them smooth.
 
Those dimples are on there for the club to catch and impart reverse english on the ball and also so when it hits the ground , it will grip the ground so that reverse english will make it "stick" where it lands. (theoretically and if it's done correctly.)
 
I will have to respectively disagree with the guy below. Auto manufacturers and racing parts fabricators have spent thousands figuring out the straightest and correct length intake runners within the confines of allowable space to make the most HP/torque and responsiveness for a given engine/application. Not once have I ever seen an intake runner intentionally turned into a pretzel to accomplish this. The carb is the fuel mixer/atomizer. Anything that either slows the speed of mixture or changes direction of mixture will eventually separate the mixture. Answer to your question is simple economics/ease of design/manufacture and a product of space and material limitations. A JD "A with 321 cid engine at top governed speed (approx 1000 rpm) only requires approx. 70 cfm of air flow. Stock tractors aren't restricted for flow. They have to suck their air through a cup of 30wt oil also. Take it off and no gain. You know you probably started a firestorm here don't ya ???
 
Yes looks like they were more interested in getting the whole engine under a narrow hood. I am sure the guys that built it knew they could do better. I looked at a Dodge factory super car. A Challenger with a 426 hemi. One of 5 made in 2012. It is the new hemi. The intake is amazingly big. But what catches your eye is the ridges in it. one every 3/8" or so. They are cut just like you cut your tires so the air can come in but is harder to go out. Kinda like petting a dog, from front to back is easy, but from back to front makes the hair stand up. Would say someone put in weekes cutting them. They had picked up 50 hp with stronger rockers and push-rods.
 
Difference is...it is only air flowing through there. Fuel is injected at port. They could be anti-reversion ridges which would deter any air reversion in direction to keep it going toward the port. They make anti-reversion headers also , and for the same reason , to keep moving air in one direction and not letting it reverse as it might on a high overlap cam system. Whole different ballgame when fuel is mixed with the air before it's trip.
 

Yes granted the straight runners and port make the most peak HP. Low rpm putting around engines are much less hampered with long, small diameter twisty intake runners.
 
You are correct on the golf ball dimples and driving further because of the physics of what it does to the surrounding air. Doesn't apply to the original question but you are correct. I still believe it will stick on the green better on stroke 2 of a par 3.
 

GOLUFFF....???

NO Real Farmer has the time OR inclination to play any citified game like that...

Give me a good old fence-row to clean and it costs me nothing and plenty of exercise to boot...!

Ron.
 
Some of the Big HP guys in the aftermarket auto world are going to "dimpled" intake runners. They are seeing a improvements on airflow numbers with the dimples v.s. the smooth runners when they are the same size. I don't know that it would help tractors much because of the lack of RPM's v.s. most race cars or street/strip cars.
 
All the farmers around here Golf all summer long. In winter they travel the world. I keep paying taxes do they don't have to.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top