- Joined
- Mar 22, 2013
- Messages
- 215
This manifold will resemble a dual plane type. For those not familiar with this engine terminology I will explain.
When engines only had 4 cylinders to feed the intake manifolds weren't that long so getting the proper mixture to all cylinders wasn't too difficult but as cylinder counts and engine configurations changed some of the cylinders were starved for fuel. It was first hard enough to get the charge out to the enc cylinders but also with the intake cycles of different cylinders the charge would have to travel in one direction then immediately reverse to feed a different cylinder. To alleviate this problem, at leas on V-8 engines the dual plane manifold was designed. With 2 and 4 barrel carburetors one side of the carb feeds only 4 cylinders, 2 close on one bank and 2 out on the ends on the other bank. This made the distribution more even so each cylinder in the engine would run the same as another, or close. There are single plane manifolds for high performance use. This consists of a single plenum (chamber) that all the cylinders feed from This is used for higher rpm's where the velocities could be maintained for adequate fuel distribution.
I started cutting the area around which will eventually form the carb bases. From there the different levels and runners were shaped. Once again a tooling change was required so the vise came off and the angle table went back up.
Actually I do have room on the mill table for both but I don't have room to tighten the hold down nuts on the angle table because they are recessed under the table and I can't get a wrench on them.
The angle was set for the outer ends. This would match the inside port runner. Each side was set up and cut.
When engines only had 4 cylinders to feed the intake manifolds weren't that long so getting the proper mixture to all cylinders wasn't too difficult but as cylinder counts and engine configurations changed some of the cylinders were starved for fuel. It was first hard enough to get the charge out to the enc cylinders but also with the intake cycles of different cylinders the charge would have to travel in one direction then immediately reverse to feed a different cylinder. To alleviate this problem, at leas on V-8 engines the dual plane manifold was designed. With 2 and 4 barrel carburetors one side of the carb feeds only 4 cylinders, 2 close on one bank and 2 out on the ends on the other bank. This made the distribution more even so each cylinder in the engine would run the same as another, or close. There are single plane manifolds for high performance use. This consists of a single plenum (chamber) that all the cylinders feed from This is used for higher rpm's where the velocities could be maintained for adequate fuel distribution.
I started cutting the area around which will eventually form the carb bases. From there the different levels and runners were shaped. Once again a tooling change was required so the vise came off and the angle table went back up.
Actually I do have room on the mill table for both but I don't have room to tighten the hold down nuts on the angle table because they are recessed under the table and I can't get a wrench on them.
The angle was set for the outer ends. This would match the inside port runner. Each side was set up and cut.