Alloy timing gear

K

Kevin in NZ

Junior Member
I believe there is a modification to drill holes in the gear to reduce noise. Can any body help me with the details on what to do. I was told the article was in a Secrets of Speed magazine.
 
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Kevin in NZ said:
I believe there is a modification to drill holes in the gear to reduce noise. Can any body help me with the details on what to do.
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Hey Kevin,
What noise :confused: Seriously ! I run aluminum time gear against steel crank gear for years , and never any noise to speak of. I also have bronze /steel crank gear in another engine. Are you speaking of noise ...first hand, from using metal gears or are you speaking of noisy fiber gear ? I've used fiber timing gears and never have heard any noise to be concerned of ?

BTW..if you have not run 'alloy' gears, but are going on the , IMO, old wives tale that they will be very noisy...well.
 
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Don't remember ever reading about drilling holes in the timing gear for any reason here on fordbarn or elsewhere. I'm interested is hearing about this as one would think if there were noise it would be from the teeth.
 
Never heard of drilling holes for a noise problem, but there is a modification to drill holes to change the valve timing.
 
I have never heard of this modification. I have bronze gears in four engines and have driven many long distance trips and never experienced a noise problem.
 
I run one , the only noise is on start up until it gets warm & closes up the clearances ....
 
I have drilled the gears in a couple of race engines but those were straight cut gears and expected to be a bit noisy.
They were drilled to reduce inertial forces though, NOT for noise reduction.
I got the idea from a Ducati motorcycle grand prix engine I worked on once. All of the gears in the engine, primary and all transmission , were extensively drilled.
Since at that time they had won several world grand prix championships, I figured it must help.
 
Pete
When I was a kid (about 15) I had and worked on nothing but Model A's & B's. Some older guy told me about drilling the gear teeth when I used an aluminum cam gear. I think he was like 18 or 19. A really old guy.
I didn't do it. Besides, the engine exhaust made plenty of noise
 
Kahuna said:
Pete
When I was a kid (about 15) I had and worked on nothing but Model A's & B's. Some older guy told me about drilling the gear teeth when I used an aluminum cam gear. I think he was like 18 or 19. A really old guy.
I didn't do it. Besides, the engine exhaust made plenty of noise
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You do NOT drill the teeth.
The holes go in the web.
 
The article l believe was to drill holes for lubrication, allow oil coming over the dam to better lubricate the gear contact points.

A's Always
Dave
 
Holes were drilled at the center of the timing gear between teeth through to just under the lip on an angle to the rear so that oil would carried to the teeth of the gear. The holes were drilled at 3 equal locations and were small .060 or something like that because some thought they needed more lubrication between gears.
 
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