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Difference Between Straight Cut And Hellical

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Yes brand names do make a difference... One of the 3 you've mentioned has had many issues far and above what you'd call "normal".

Have a google - you'll soon work out which. Each have it's pro's and cons. Different gear ratio options and so on.

I'd suggest you do some research here on SAU and again, more google. There is more then enough information on this very forum alone to give you plenty to think about.

turboedsloth Grand Master

turboedsloth

Posted
Posted

I notice Par not having a great name, there has to be people out there that actually have a par set and are happy with it.

I don't think PAR like using PAR gearsets

As above, go OS GIKEN

As for differences between straight cut and helical. Straight cut is stronger, but noisy. Whereas helical is like a standard gearsetcikk286_tolokerekesvalto.jpg

nengun-1757-00-osgiken-close_gear_set.jpg

The Dan Grand Master

The Dan

Posted
Posted

And in addition to that:

The reason straight cut is stronger VS helical cut is because the two gears aren't trying to twist off each other. The only reason helical cut gears were developed was to reduce noise.

There is absolutely nothing wrong with PAR gearsets. From the reading I did when they were supposedly having problems, it was dog engagement gearboxes that were having the problem and I can tell you now, dog engagement needs to be driven VERY SPECIFICALLY so make sure you are aware of this if you choose this path.

The options are:

Helical synchro

Helical dog

Straight synchro

Straight dog

Obviously the sets with synchromesh are nicer to drive. Dog engagement should be considered race only and if driven too 'nicely' you will f**k them very quickly

P.s. The gearset picture on top is straight dog. You can see the dog selectors which are like large castle sections which lock in together

Tai1or Made Grand Master

Tai1or Made

Posted
Posted

From memory of dealing with custom Hearst manufacturers, you can also fit wider straight cut gears in a housing than you can helical cut.

This is only relevant if it's a dog box (my understanding).

Birds Grand Master

Birds

Posted
Posted

This is only relevant if it's a dog box (my understanding).

Ahhh that's what I was trying to think of. This was the reason why most big HP straight cut gearsets are dog engagement.

That meant to say gearset too, not "Hearst" lol.

GTRAAH Experienced

GTRAAH

Posted
Posted

How strange is that, people who try to say that nothing is wrong with par ... Like look at the above comment... I just cannot believe it NOT 1 person can say they have a PAR and its great NOT 1 how can they be a good brand if this is the case?

The Dan Grand Master

The Dan

Posted
Posted

Yeah I know a lot of people have had dramas but what I heard was the dramas were to do with the way they were being driven which caused premature wear of the dog teeth.

I cannot personally comment on their quality as I have never used a set from PAR but TBH how could they still be in business if they had a shit product. I can tell you for certain that if they are driven gently, they will be wrecked in no time. I spoke with PAR a while back about it when we were looking for solutions to breakages and they told me that was the very reason they were having problems - that and workshops fitting them that didn't know what they were doing.

NYTSKY - did your firends have the PAR sets installed by PAR? or were they fitted by someone else?

GTRAAH Experienced

GTRAAH

Posted
Posted

So even tho straight cut is stronger, A helical OS Giken would be the choice. That equals WOW.... They must be really bad in that case as a straight cut is roughly 35% stronger then a helical. So if an Os GIKEN helical is stronger then a Straight cut PAR, then basically a helical PAR would be around 70% weaker then a Helical OS Giken. LOL

Piggaz Grand Master

Piggaz

Posted
Posted

You cannot really go wrong with OS GIken, though. No bad reports. Holds tonnes of HP.

I'm pretty sure the choice is simple

+1. I own one and it's great. The tall first is a cool thing too, although I'd say you'd really need a stroker to get the most of out this box. The tall gear's can work against you on a 'peaky curve' car.

Nee-san Grand Master

Nee-san

Posted
Posted

So even tho straight cut is stronger, A helical OS Giken would be the choice. That equals WOW.... They must be really bad in that case as a straight cut is roughly 35% stronger then a helical. So if an Os GIKEN helical is stronger then a Straight cut PAR, then basically a helical PAR would be around 70% weaker then a Helical OS Giken. LOL

It isn't that straight cut (haha get it ?) you can't really say they are ~30% stronger, there are upsides to helical gearsets other than reduced noise. for example a helical gearface actually has a greater meshing contact area to distribute forces more evenly (we are speaking relatively about the gear sizes themselves obviously) helical gearsets are also more robust when you're considering axial loading.

33GTRV Mentor

33GTRV

Posted
Posted

i have a par gearset, actually, ive had 7 of them.......and to be honest, its still going through small claims after over 12 months. The gearset in question was a syncro set, and as far as im concerned, i will never reccomend them, nor use them, i would not even use the gearset to put out gerrard if he was on fire. It has cost considerable money, time and i have ZERO patience left. I highly reccomend going an OS set or the PPG set.

For more information regarding the issues feel free to PM me.

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