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Straight Cut Cam gears.....are they all the same ???

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Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 ·

#908557
I'm wanting to put straight cuts into a performance motor I'm building, but I wanted to know if there is a prefered brand I should be using ??

I'm probably going to use berg ones as I have stuff that I'm ordering from them this week....BUT....are CB performance, scat, bugpack etc all as good as each other ??

Cheers for your advice 😎


matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#908559
Magnum via Berg for me.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#908595
Yep
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 ·

#908613
Yeah same as mine

waltermitty Legend when my beer goggles are on

1,993 posts · joined Aug 2002 ·

#908843
Ollie wrote:Can someone explain what straight cuts actually are?
Like most wives they make a noisy whineing sound all the time. Mitchell
23 windows ...8 too many!

vwo60 Veteran Volks Folk

2,036 posts · joined Feb 2007 ·

#908845
I concider a set for my new build but deceided not to use them after Dangerous Dave told me that they wear quickly.

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#908847
IMO they don't wear prematurely all things being equal (that is good quality ones, esp steel/steel). I run them on all dual spring applications to prevent premature cam thrust bearing failure. (and yes, all my engines also get two thrust's fitted with directional oiling groove)

EDIT:The stock gears are helical gears that introduce a force that tries to drive the cam and crank in the direction of thrust in opposite directions, this will wear cam bearings when higher loads of more valve spring tension are encountered.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

vwo60 Veteran Volks Folk

2,036 posts · joined Feb 2007 ·

#908909
I just pulled down my 2110 running dual springs, fk87 and using a set of helical gears, no wear on the thrust, as i said dangerous dave told me he has pulled a few engines down and the straight cut gears were worn. i have a set of Gene Berge straights cut gears and would not use them in my new engine as the machining is very rough with the gears only machined and not ground.

DubbyDo Officially Full-On Dubber

276 posts · joined Jan 2012 ·

#908926
I want straight cuts when I build my motor, are you able to adjust the timing with these without splitting the case every time you want to adjust them? Do they give you cam specs at .050" when you buy an aftermarket cam?. Forgive my ignorance, Ive only degreed cams in on Holden 8's, I'm guessin it would be done the same way

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 ·

#908930
Most come with degree washers, so yes you can change the cam timing (+ or - 4deg) without splitting the case.

Yes Cams have the specs at .050 so you can dial in your cam.


vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#908941
waltermitty wrote:
Ollie wrote:Can someone explain what straight cuts actually are?
Like most wives they make a noisy whineing sound all the time. Mitchell

no actually they sound quite nice compared to wifes and women.

they are a mechanical whine not emotional, irrational, menstrual nagging whine. Geez guys, don't even know the difference?

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

DubbyDo Officially Full-On Dubber

276 posts · joined Jan 2012 ·

#908944
Craig Torrens wrote:Most come with degree washers, so yes you can change the cam timing (+ or - 4deg) without splitting the case.

Yes Cams have the specs at .050 so you can dial in your cam.
Is it just a case of leaving the oil pump off till you are done?

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#908973
Yep, pull the oil pump to adjust cam timing. There are all sorts of reasons they wear, no argument. I,ve also pulled engines to find premature cam bearing wear on the thrust so tend to sway towards straights, but certainly only a must with higher spring tensions.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE