RRiver
Automotive
- May 21, 2018
- 119
I hesitate asking about this but I can't find anything meaningful about this. Beyond Neutral, right hand rotation and left hand rotation which is obvious with a simple measurement if not observation. Over the years there have been some engines commonly known rotation angle and in the 70's it was typically humorous to hear something like 10 consecutive identical cars coming off the assembly line will have 10 different rotation angles. Accepting humor like this is based in some measure of truth, there must not have been a lot of concern about it.
I'm asking now because I am currently building a 1999 F150 with a modified chassis, frame and suspension, and a new drivetrain. The original engine had no rotation angle. The new engine is a 2013, NOS crate Mustang GT, 5.0 Coyote. The engine is a Modular engine. Modular refers to the production process and has nothing to do with the internal operation of the engine. Before making any changes to the chassis I installed 5.0 in to the truck and the rotation angle was 3 degrees to the right from the front or 3 degrees to the drivers left. I'm using right here so the driveline isn't split front and back from the flywheel.
One of the characteristics of the modular is every modular block is machined with either 5 or 6 identically located points for locating the motor mounts. Anyone familiar with Ford engines understands, what took them so long to figure this out? Anyway, differences in what hangs off of the engines like the headers instead of a manifold meant I couldn't use the original modular mounts. Getting working mounts was no problem and the engine sits with the 3 degree rotation.
The problem is I can't verify if the 3 degrees is correct or not because the engine wasn't available in 99. Being Modular the mounts fit but that doesn't make them dimensionally correct and using the 2013 mounts for reference doesn't work because although they fit the engine, how the mounted to chassis is very different. To compound the problem, in 2013 the Mustang GT's with the engine had both 0 and 3 degree rotation and I cant find anywhere or from anyone an explanation to why that was. Furthermore as I said, I can't find anything about engine design considerations for using different rotation angles. There's all kinds of information about driveline angle considerations though.
When I build a car I don't want to wing anything. I want to know why and to be able to explain the decisions and choices I've made. I would really appreciate any educating, advice or experience anyone can share about this. I also hope I didn't put anyone to sleep with this. I wanted to make sure I didn't leave anything out. Thank you.
I'm asking now because I am currently building a 1999 F150 with a modified chassis, frame and suspension, and a new drivetrain. The original engine had no rotation angle. The new engine is a 2013, NOS crate Mustang GT, 5.0 Coyote. The engine is a Modular engine. Modular refers to the production process and has nothing to do with the internal operation of the engine. Before making any changes to the chassis I installed 5.0 in to the truck and the rotation angle was 3 degrees to the right from the front or 3 degrees to the drivers left. I'm using right here so the driveline isn't split front and back from the flywheel.
One of the characteristics of the modular is every modular block is machined with either 5 or 6 identically located points for locating the motor mounts. Anyone familiar with Ford engines understands, what took them so long to figure this out? Anyway, differences in what hangs off of the engines like the headers instead of a manifold meant I couldn't use the original modular mounts. Getting working mounts was no problem and the engine sits with the 3 degree rotation.
The problem is I can't verify if the 3 degrees is correct or not because the engine wasn't available in 99. Being Modular the mounts fit but that doesn't make them dimensionally correct and using the 2013 mounts for reference doesn't work because although they fit the engine, how the mounted to chassis is very different. To compound the problem, in 2013 the Mustang GT's with the engine had both 0 and 3 degree rotation and I cant find anywhere or from anyone an explanation to why that was. Furthermore as I said, I can't find anything about engine design considerations for using different rotation angles. There's all kinds of information about driveline angle considerations though.
When I build a car I don't want to wing anything. I want to know why and to be able to explain the decisions and choices I've made. I would really appreciate any educating, advice or experience anyone can share about this. I also hope I didn't put anyone to sleep with this. I wanted to make sure I didn't leave anything out. Thank you.