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FAT KUDA
Samba Member
Joined: July 31, 2005
Posts: 45
Location: Northern Cali/ Bay Area
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 Posted: Wed Sep 14, 2005 12:27 am Post subject: GEAR DRIVE SOUND |
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Hey i dont know if it would be bugs only, but i knew a guy years ago that all his engines had like a gear drive sound. any knowledge of this?
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rokcrln
Samba Member
Joined: August 07, 2005
Posts: 162
Location: Winters ca. 95694
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| Posted: Wed Sep 14, 2005 4:54 am Post subject: |
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He just added "straite cut timming gears" to the motor. We used to do this back in high school in the late 80's. I am sure they make them for type3's but you will need to split the motor in half to get them installed.
Kevin
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blankmange
Type 3 Darksider
Joined: July 17, 2004
Posts: 11498
Location: Bloßer Stahl-preapocalyptic MidCoast
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| Posted: Wed Sep 14, 2005 5:46 am Post subject: |
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straight cut timing gears are available; I think BugPack makes a set... their value is questionable, however, in that other than making that cool noise, I have read that they have a tendency to wear quicker that helical cut gears...
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SquareTone
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Joined: July 10, 2003
Posts: 1204
Location: Jenks, Oklahoma
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| Posted: Wed Sep 14, 2005 7:11 am Post subject: |
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| blankmange wrote: |
| ... their value is questionable, however, in that other than making that cool noise, I have read that they have a tendency to wear quicker that helical cut gears... |
Yep. The helical cut provides a much larger surface area. That reduces the PSI on the tooth face - therefore slower wear. It also makes the tooth able to withstand a stronger force. That's why most industrial gears are either helical or herringbone, but it's immaterial in our application. The main advantage to straight cuts is that they eliminate the thrust load on the cam bearings. Kind of useful in high RPM racers.
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Tony
'70 Fastback AT/FI (daily driver (exept when the starter won't work, or it's out of gas, or I don't go anywhere, ...))
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littlebuggie
Samba Member
Joined: March 23, 2004
Posts: 698
Location: California
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| Posted: Wed Sep 14, 2005 8:59 am Post subject: |
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| SquareTone wrote: |
| blankmange wrote: |
| ... their value is questionable, however, in that other than making that cool noise, I have read that they have a tendency to wear quicker that helical cut gears... |
Yep. The helical cut provides a much larger surface area. That reduces the PSI on the tooth face - therefore slower wear. It also makes the tooth able to withstand a stronger force. That's why most industrial gears are either helical or herringbone, but it's immaterial in our application. The main advantage to straight cuts is that they eliminate the thrust load on the cam bearings. Kind of useful in high RPM racers. |
Thats one reason I have them in my 2054cc Type 3 Motor. Strait cut gears do not force the cam and crank into the back of the case. The cam and the crank with the hex gears get forced backwards. Besides, I'll put strait cut gears in all of my motors from now on.
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FAT KUDA
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Joined: July 31, 2005
Posts: 45
Location: Northern Cali/ Bay Area
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| Posted: Wed Sep 14, 2005 11:10 am Post subject: |
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Rockcrl, I heard there is a shop or 2 for parts and woek in winters??? Yah thats the last i knew of that sound was in high school.
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FAT KUDA
Samba Member
Joined: July 31, 2005
Posts: 45
Location: Northern Cali/ Bay Area
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| Posted: Wed Sep 14, 2005 11:14 am Post subject: |
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So is the take on straight cut timing gears, does it effect the longevity of your engine, or not. the engine i plan to build it will probably b driven 35+ to be realistic. as cool as the sound is, just want to make sure going in the right direction. 
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Russ Wolfe
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Joined: October 08, 2004
Posts: 25187
Location: Central Iowa
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| Posted: Wed Sep 14, 2005 6:50 pm Post subject: |
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| SoLow-Square wrote: |
Thats one reason I have them in my 2054cc Type 3 Motor. Strait cut gears do not force the cam and crank into the back of the case. The cam and the crank with the hex gears get forced backwards. Besides, I'll put strait cut gears in all of my motors from now on. |
If you are using straight cut gears to avoid main bearing wear, then you need an automatic tranny too. Every time you push the clutch in, you are putting thrust on the #1 main. Funny thing is on all the hundreds of engines I have rebuilt, the automatics usually have very little wear on the #1 main thrust.
"71 Fastback automatic with over 100K miles on th engine and climbing.
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