Straight cut cam gears. What determines when to use them?

[Arnolds64]

Put them in my street 2017. I did however buy the less noisy CB's. I really can't hear them that much from the drivers seat. Whe you rebuild why not improve it? If it gives me a few extra ponies and will let the valve train rev easier for not a bunch of money then why not. I looked at it this way. I did not go with light lifters so taking friction away may equal it out. My little stroker really revs well and it needs some tuning yet. the sound is more of a whining at idle and that is about it. I really don't notice much on my however just a hint. So if noise is loss of HP then the CB's must be the best?

I mean lets face it. With a merged Header and a big Dynomax hanging out back you can't tell much of a difference from one noisy thing to the other. If you want quiet you are into the wrong cars. Go to a Lexus forum or something.
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64 Bug, White, 2017, Dual Weber 44's, Engle 130/Engle lifters, Home P&P'd 40X35 heads, CB 4340 nitrided crank, Eagle knock off H Beam 5.5" rods, Lowering Beam, Rancho Trans, Traction Bar. 225X60's rear, 145's front on Porsche Chrome Nipple Wheels.

[shegel]

just because i hear people talking about them everyonce and a while. what exactly is the benefit to running strait cut cam gears. just so you can run heavier valve springs? im kindof confused
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My stuff with engines
1969 Karmann Ghia
1999 Jetta tdi
1977 Honda gl1000
1993 Honda xr250L

[jamestwo]

not sure, just what i was thinking. what is greater loss, the noise or the friction of the side load on helical gears?
I'm in favor of them by the way, I just make them quiet.

How? offset cam bearings.one more secret out the bag for you, must be .5 hp there.

[millerje78]

[Bruce]

[jamestwo]

It takes HP to make noise....energy is not free and noise is energy.
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hEY, lOOK, i'M WRONG HALF THE TIME, AND THE OTHER HALF i'M NOT SURE WHAT THE HECK i'M TALKING ABOUT. MY POST ARE FOR MY OWN ENTERTAINMENT VALUE ONLY.

[kekonaiii]

I like to use straight cut gears in stock motors. When I rebuild peoples stock motors I put Counter weighted cranks and straight cut gears and Double Thrust Cam Bearings. In my own opinion I feel this makes for a better stock motor, things that cause less wear...

For high performance do what you want to do. I would always put the straight cut in unless told not to by the customer..

[70VWkid]

finally some people who are actually for them!

[Ohio Tom]

That video doesn't sound like straight cut's to me. More like fan rubbing fanshroud noise.

[bugnut68]

[kekonaiii]

That is correct that is something we use to do in Hawaii back in the 80's

[CJG]

sorry that is not a strait cut gear noise, I have seen it done before with the fan. that is the fan making that noise, please

[kekonaiii]

I bet you that car is from Hawaii...

[Fattie]

this one is crazy loud !
Video:
http://myspacetv.com/index.cfm?fuseaction=vids.individual&videoid=16435359
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[Bad bug]

[kekonaiii]

I ran a set of dyna gears (bought at swapmeet &10.00) the year before last all season in the drag car. It runs 11.81ET 1/4 mile at best and the car is 1650lbs. I had no problem making every PRA event but one.

of course we just threw the motor together just so we could go race and it worked well so why change it. I will run the same gear this coming year and I am not worried about it. I think the Dyna gear in good enough for the street application...I'll sell you mine since it's already tested for 5.00. just kidding..

I run straight cuts in everything even the stock motors. The gears I use don't have a big giant whine. Even a stock motor pushes hard on a thrust bearing..

You can't make a wrong choice do what you like. You have enough info to make the choice...

Aloha Kona

[57 Rag]

I got a set of Scats in my new motor and can't tell I have them unless you really listen for it. I wanted them quiet but not that quiet.
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57 Ragtop
84x94 86C
IDAs

[CJG]

When I was a senior in High School in 1988 I was the first to have the straight cut gear deal and the whine, little 1835 with a 120 cam and some 40IDF, probably only made 110 hp but it kicked everyones ass and sounded cool at the same time, I have had the same gear set since then which is Magnum, steel on steel. Yeah I like the sound but the motor is pretty stout now being a 2276 and making just over 200 hp at 6700 RPM'S. The sound is to each and their own taste. If your making more than 170 hp you will probably want to run the straight cuts. Good luck

[Ohio Tom]

So just install them for the reason I have listed above and steer clear of dis-honor. LOL....
The V-8 croud has done it for the same reasons for years.

I like Mangnum, CB, Scat, Competition Engineering, etc... As long as they are billet.
Don't get cast Dynagear or the super cheap dynagear-copies either.
The loudness of them will depend on the case and the brand of gears used.
CB's are quite for one person, and loud for another (in a different case).

[70VWkid]