If a thinking man was going to replace his cam gear, with the intent of building a touring engine, which would he select?
I understand there are fibre, nylon or brass to choose from.
I would go with aluminum, bronze or original. My nylon lasted a long time but when it went, well that's a long story. Fiber gears are well known for stripping teeth. Which ever gear you use, take a hard look at both the crank and generator(if you have one) gears. If the teeth are worn and pitted, it's a good idea to replace them too.
RE fiber gears, there were some that have stood up fine over the years but you would have to know what type of construction they are. The ones that are resin coated sheet of cloth pressed into a mold are better, the other type is chopped up fiber mixed with resin and pressed into a mold, them not so good.
Unless you are running an overhead, I would use and aluminum gear. If the engine is apart replace the crank, cam and generator gears with gears from the same manufacture. DMC are the best and he can supply advanced gears as well as undersized for correct clearance.
I replaced the fiber gear in my 11 touring this spring. Probably installed in the fifties but didn't want to take any chances. Went with an aluminum gear.
I've never had an issue with fiber timing gears on nongenerator cars. I like the fact you can buy them with .003 or .005" oversize if the distance between the cam and crank is too great.
I assume this is for Dave's 1926 Tudor. Presumably it has a generator. Why risk it when better choices are available?
I believe the best are NOS original or Dan McEachern's bronze gear. Second best would be aluminum. I would never have another fiber gear, and I'm not a big fan of nylon either.
I have a nylon gear now with maybe 1500 miles on it, it's showing signs of wearing already.
I think I'll replace it with a bronze gear...just in case
my cars have bronze
I'll add a vote for Dan's bronze gear, they are very nice indeed.
Andy What's with no aluminum with an overhead
Does Dan have a currant /updated web Site ??? Went to one I found on google outdated by over five years.
He doesn't have an ad in either of the magazines, but the parts dealers sell his gears.
Here's another way fiber gears fail. We suspect this one might have been stressed by someone over torquing a distributor gear on the cam.
I think that the bronze should be used with the overheads. The load is higher with the overhead and the bronze is a little tougher.
Any of tbe metal gears if your not running anything off the cam gear you be happy with fiber gear
I can understand there being less load on the gear without a generator, but there is a load there none the less. Why take the chance on something that has been proven to fail at times, over the other options that we have available?
I have built a couple engines and have noticed if you use some of the suppliers gears you will get gear noise from them. I spent the extra for a well made gear and there is no cam gear noise, the DMC gears are the best on the market. I will show people the difference of running the two sets of gears together by hand and they can feel the how much smoother they run. Just my thoughts,Joe
You can always send me a PM thru the forum or e-mail me at dmcgearsATyahooDOTcom. Dan
Reason I use fiber is you can get them oversize.
Dan will make you any size you want.
I won't run another fiber gear. Don't ask me Why? hee hee
If running a car with a generator, check the clearance between the generator gear and cam gear before installing the timing cover no matter which cam gear you use. I found it necessary to space out the generator bracket with an extra gasket to get correct gear mesh.
If you want a quiet gear train.
1) Get all three gears from the same manufacturer.
2) Ensure that the front cam bearing is good and fits the block well.
3) Ensure the proper clearance between crank and cam gears. Look it up every time. Don't trust your memory unless you do a lot of motors.
4) Ensure proper clearance between cam and generator gears. Again look it up. This assumes good bearings in generator.
Do it right, do it once.
There are aluminum oversize and undersize gears in the Lang's catalog.