Big bore shock v`s
 

What are you views, pros and cons off big bore shocks not just schumachers big bores v`s normal bores shocks?

Reason i ask is i have a s**t load of the old grey pro shocks with ally cartridges that i might use instead of the purple bodied S1 shocks.

big bores are way better, thats why all the 1/8th buggies went to big bores,there really is a massive advantage on the track,

Massive advantage.. no
1/8th went to them becuz it was the next big thing. Now with the cars being as large as they are it may have helped with the rougher tracks but its probably not going to make you a .1/sec faster, maybe mentally. With as light as these electric cars are it'll jus add weight and soften the landing from that tripple you've been over shooting all day

having driven them i do find them a big advantage, mainly over the bumps and especially when landing off jumps. the car has a far larger safety window meaning you dont have to be quite so acurate all the time. for the average club racer i can see this being a big help. as for weather they improve a laptime is another thing but they do help to gain consistency in a run so you can get more of your quicker laps ;)

the only advantage of big bore shocks is that temperature changes dont affect the viscosity of the oil as much due to the increased volume of oil in the shock. I cant remember where i read that but apparantly itsd true

Mmmmm, so if the temperature changes, only some of the oil changes viscosity :eh?::eh?::eh?: How's that work then? Does some of it not change temperature? :eh?: Whoever wrote what you read was wrong if that's what they wrote ;)

G

a lower volume of oil will obviously change temperature according to its environment alot quicker than a larger volume of oil. Think of warming a babys bottle of milk up in a jug of hot water. A thinner bottle will warm milk up much quicker (is it convection that im trying to explain:confused:)
I know what i mean anyway

I think he means that big bores work more consistency over a larger temperature range compared to normal shocks due to a larger volume of oil...

Like water in the sun..small amount will evaporate quicker then a large amount.. I think.

Granted that's all far to technical for me...I simply put shocks on, drop car from 3 feet and see what happens...Big bores don't bottom out as much, job done... :)

J

having sat track side and watched two of the very same cars going around, one with big bores on one with standard ill take big bores all day long,
massive advantage YES. better through the bumps better of jumps and better of landing how the hell can you say thats not a advantage,

Now that might be true if we were talking about quick heating/cooling of shocks here (like a baby bottle in a pan), but we're not. Even with our poor weather the temperature changes slowly..... ;)

They are better for other reasons that even I do not understand all off/or fully. But I know some.

G

tell us o what u no northy please;)

Read very carefully what I wrote. I said yes they help thru the rough and over jumps. And just like stated previously on here, they do help with consistancy (they absorb more) but so that is me stateing their advantage, but it is not MASSIVE it won't allow you to be any more specatular. I've driven several cars before and after and it does have its advantages yes but it won't make your car gold either. Massive advantages to me are faster laps, nothing else matters.

But they give some a placebo effect...

I see you've got a XX4 in you sig.

It has been a well know fact that the Losi shocks are / have been the best out there.

I'm certainly looking forward to trying them on my Cougar SV CF and Cat SX.

The other way I see it (please correct me if I'm wrong) it enables you to run a thicker oil and thus potentially stabalises the car more.

I myself am interested in the benefit of the rounded pistons as they are now listed on the Schumacher site under the big bore section.

The original Cat SX shocks were never that bad as Grant and Simon did well with the car last year. Mike Williams helped me with my original Cat SX shocks at EPR in March and it is much better.

I don't have the xx4 anymore but I do run losi shocks on my x6, they actually allow lighter oils and springs (more is less if u will) compared to smaller shocks which need heavier oiils and stiffer springs to compensate for their lack of size.

i see it as if you have a one of each size of shock, and they both have the same oil and spring rate and also have the same surface area of holes in them, the one with the larger diameter piston will automatically give more inital pack once it is asked to work thus making it better for landing of jump, but on the flat(ish) bumpy stuff it would be worst for being to hard initally and make it unstable or maybe bounce?

Ie it takes greater force to move the oil through the larger diameter piston as there is more oil trying to squeeze through the same gap, thus making it a hard ride.

Mikeyscott,
I think the only reason why losi shock are in most people minds the best out there, is they allow the smooth flow of the oil due to chamfered edges v`s the square like edges of most others.

And the guys talking about temp changes!! it`s silicone oil isn`t it? so it`s viscosity shouldn`t change.the change happens to the shock body itself. and expands with heat, which then lets the oil pass on the outside of the piston giving the illusion it thinned the oil.

I like the original SX shocks i would be very happy to have them on my SV when Schumacher release it, so if anyone whats to swap new set of normal bore Schumacher Shocks for the big bores, i would.

The only thing I dont like about the old schuii schocks are the oil gets dirty fast. They are like AE shocks. Dialed when you get them right, but have to Up keep on them more. I like the New Kyosho Shocks. They are dialed. And dont need to be rebuilt for a whole month. Schuii shocks every 3-4 Races.
PLus they dont give alot of Down travel for the macher. It is very low to the ground. I htink these will be a big advantage for us.:thumbsup:

There is nothing in this world (or dare I say universe) that does not alter with temperature. Silicone oil gets "thinner" when hot and "thicker" when cold - fact. The reason we use silicon oil is because it does it less than other oils (is affected less). Whatever manufacturers write on the label is called marketing ;)

G

I like the normal shocks as you dont need to put as much oil in them so you are saving money.:p. But I am a tight arse LOL.

i think the only advantage of having a larger bore shock is to get a larger surface area of piston in there.

Larger pistons with more surface area allows more holes to be equally spaced around the entire piston 5-6+ holes ??

This makes damping smoother, more consistent and more tuneable.


Baby oil is NOT 25wt i keep telling you.

As already said by others also. With the big bores on the car there is a much larger window available for tuning them.
As With there size they are also easier to work on to achieve desired results which were beyond the capabilities of smaller bore shocks.
Load is spread across the larger piston and oil and therefore a more consistent feel is met, yet the pitch feel can stay the same.

I'm no expert but I have been hands on with Grants car and we have tested a number of things. I rounded his pistons which helped in certain conditions.

I thought they are better cos they look good and are new

Ive found where i read it. Its in this months issue of radio race car. Page 104 i think. It says its to minimise the effects of temperature change. Have a read

It must be correct then if it's written in there.


BTW, I'm just off down the chippy for my dinner. I read in the paper once that Elvis worked down there and I'm a big fan of his! :woot::woot::woot:

And tonight I'm going to get my telescope out to look for that double decker bus on Mars! :woot::woot::woot:

G

Would have a read if I could get it :(

All i want to know is How Much & Part Number :thumbsup:

Will they make me faster - doubt it
Will they make me drive better - doubt it

Will they be shiney and new - absolutley :thumbsup:

Any ideas when these will be available seperatley ?

Quite possibly over 5 mins, maybe not over a single lap.


Quite possibly over 5 mins, maybe not over a single lap.

G

Not being an expert in thermo-fluid dynamics or anything, or not having read the article, my guess is that the temp changes you are referring to are due to friction between the oil and piston and also turbulent particle flow of the oil through the piston. Logically the increase would not be as great in the big bore shock. However, could you actually notice a difference in viscosity due to these effects between the 2 shock types over a 5 min run? Very unlikely!

Hi Trish,

You mention rounded pistons in certain conditions, what conditions?

I assume the starting oils for the EPR, RHR and Stofold etc. must be higher now.

Mike

Why? :confused:

Yer, just gone back to do some rallyx, bought an MP9 OMG the shocks are huge:woot:, I'm going to be getting shock oil in 5ltr cans soon:D

I thought people run thicker oil with the big bores etc.

I know there is the pistons element.

Until I get them I'm just trying to get the set-up direction in my head.

I ran 40w 3 hole drilled 40w in the front and 30w in the rear drilled again at EPR. So potentially 40w front 6 hole, 35w rear 4 hole?

with the clocks changing this weekend pending whether the Cat SX2 is released next week I'll have to do some evening testing at our local track next week and the week after..


I'm probably miles off the mark with my thoughts :( Give me computer stuff and it's easy!

I'd just wait until the team guys start releasing set-ups ;) But I don't think you'd have to go any thicker on oil.

G

Yeah that's what I'm going to do. Just trying to figure things out for myself :( and not doing very well.

Cheers,

mickey once u get ur big bores we can put u right on the oils pistons and springs. we are running same sort of weightt oil at the mo and messing around with piston holes and sizes if any thing with the big bores u can run lighter oil and still get the pack . because with the standard shocks we ran thicker oil to try and get the pack we needed.

Cheers,

I thought I had it the wrong way round and the above makes more sense :)

Looking forward to trying them at EPR on the 11th if they are out etc.