Hole pattern

[Dusty B]

Is there a template or pattern for cutting a hole in the hood for the exhaust pipe?? Replaced the hood and the hood does not have the hole! Of course the alternative is to switch to an under slung exhaust! Open to suggestions or recommendations !!

[Dale Finch]

I have a nice exhaust manifold for the underslung exhaust (with elbow) if you decide to go that way. Personally, I prefer to NOT have exhaust in my face. Plus, I use my cubs (5) for mowing and with the undersung exhaust, I don't have to worry about hitting branches with the muffler!

[ricky racer]

No template but the hole center line is 3-5/8" back from the seam and it looks like 7-7/8" up from the bottom edge of the hood. The hole diameter is 1-3/4". I hope this helps. I'm not sure why I have a double picture....

[Bob McCarty]

Dusty, The curve of the hood changes the shape from a circle to an oval (egg shape). If you have another hood you could pop off, you could place a thin piece of cardboard under the hole and trace the shape to be transferred to the other hood. If you don't have a hood to trace off of, PM me and I can mail you a tracing.

[Barnyard]

I'm not sure why I have a double picture....

You uploaded the first picture twice.

[ricky racer]

Dusty, The curve of the hood changes the shape from a circle to an oval (egg shape). If you have another hood you could pop off, you could place a thin piece of cardboard under the hole and trace the shape to be transferred to the other hood. If you don't have a hood to trace off of, PM me and I can mail you a tracing.

Bob, I'm guessing that if he takes a 1-3/4" hole saw, held vertically, the hole will come out correctly. He'd probably need to mark the center of the hole and drill a pilot hole to keep the hole saw from walking and may have to use a longer drill bit in the hole saw arbor so it can enter the pilot hole before the saw teeth meet the hood material. I may be wrong but that is the approach I would take if it were me.

[ricky racer]

I'm not sure why I have a double picture....

You uploaded the first picture twice.

[staninlowerAL]

Agree with Dale, that would be my choice.

[SamsFarm]

I been thinking of machining a guide to screw in the manifold to do a proper through hood exhaust!

1) If your getting exhaust in the face from a though hood exhaust, then your doing something wrong!

2) If your tree branches are so low that they can hit your through hood exhaust, then surely they are low enough to hit the driver!


In which case your saw(s) is feeling lonely and neglected!

[smallfarm]

Don’t use a longer drill bit to follow the pilot hole. The flutes will cut the pilot hole “downhill” causing the hole saw to walk. Use a smooth rod the diameter of the pilot hole.

[ricky racer]

I been thinking of machining a guide to screw in the manifold to do a proper through hood exhaust!

1) If your getting exhaust in the face from a though hood exhaust, then your doing something wrong!

2) If your tree branches are so low that they can hit your through hood exhaust, then surely they are low enough to hit the driver!


In which case your saw(s) is feeling lonely and neglected!

Back in the day, I had a rain cap on my Cub (mounted with the pivot out front so it wouldn't catch branches) but noticed that I would get exhaust in my face when using it. With the rain cap removed it also eliminated the exhaust in the face.
Myself, I like the through the hood exhaust. I ride down wooded trails and the muffler catches the spiderwebs before my face does.

[ajhbike]

I get nervous with the underslung in a hot dry period while bush hogging long grass...with the cub and the ferguson...nothing has ever lit up but it makes me nervous...I would prefer vertical.

[Dusty B]

Thanks everyone,gives me lots of options!! Have not had any concerns with my other Cubs with under slung exhaust or with the vertical ones either so I feel free to go either way! That being said I hate to chop up a nice hood with my sloppy machine work,, thanks again!

[Jim Becker]

Bob, I'm guessing that if he takes a 1-3/4" hole saw, held vertically, the hole will come out correctly.

I agree that theoretically would give you the correct hole. In practice, I can't imagine getting a decent hole using that approach. I know if I tried it, the result would be catastrophic.

[JohnMihevic]

I would never cut a hole in the hood. My 1948 Cub had the vertical exhaust. I hated smelling the exhaust. Also, I do a lot of mowing and I have a lot of trees. I got the 90 degree elbow and underslung exhaust pipe. One of the best things I did to my Cub. For the "purists", I guess it's not original and I have a hole in my hood -- but I'm happy.