Author Topic: Robl Engineering Prototype Intake Completed (Read 92153 times)

swanitalia · « **Reply #150 on:** April 21, 2016, 10:17:38 AM »

Another idea instead of welding have the box held together with fasteners making it convertible from box style to eliminator style.

It's just a idea, it would be nice to remove 4 screws from the front and be able to pull the back part of the box off.

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troybilt · « **Reply #151 on:** April 21, 2016, 10:25:23 AM »

Quote from: Tbone07;66811

I noticed the difference with the subframes too.

Would custom filters be more difficult to obtain in the future? And how fast could we get a filter if needed in a pinch?

It would be nice to be able to go to any online store and buy the type of filter (foam, K&N) that is desired. Whether that's a 450r or 250r filter.

How significant is the difference in flow capabilities between the 450r and 250r filters? I imagine if you're in big Sphynx or Puma territory it would be greater

Oh you can run any of those 250r filters. My custom S&B filter would just be an option if you wanted more flow, but you can run the 250r K&N or UNI with it no problem.

rablack21 · « **Reply #152 on:** April 21, 2016, 10:26:04 AM »

Don't hybrid quads use 250r filters?

Skeans1 · « **Reply #153 on:** April 21, 2016, 10:26:20 AM »

Quote from: troybilt;66809

If I back off from using the S&B filters, (which are really good filters!!)... there is more room to work with if I stick with the standard 250r filters. I might see if S&B can make a custom filter for me that is similar in size to the standard 250r filters.

Are they the dry style filters Troy? If so I know they can dust an engine pretty easily.

troybilt · « **Reply #154 on:** April 21, 2016, 10:26:30 AM »

Quote from: swanitalia;66812

Another idea instead of welding have the box held together with fasteners making it convertible from box style to eliminator style.

It's just a idea, it would be nice to remove 4 screws from the front and be able to pull the back part of the box off.

Sent from my SM-G900P using Tapatalk

Yes that's they way all my 450r boxes now, tbone was suggesting I do that the same with the 250r box. I'll work on it, but I'm trying to also keep the costs in line as well.

troybilt · « **Reply #155 on:** April 21, 2016, 10:29:59 AM »

This is all going to go alot faster when I pick up that bike, hopefully this weekend. Right now I don't want to get too far down the road until I can test fit/dyno, etc...

Skeans, I'll work on a big bore intake/eliminator setup. The reality is an intake that works well for a 250cc-300cc motor isn't going to work well for a 408-430cc motor, also porting is going to factor in there as well. So I'm going to end up having several intake designs for the R. Which is not a problem I have 4 or 5 designs for the 450r now. Just more difficult to manage inventory etc.. but I'm working on a new system for that as well.

Tbone07 · « **Reply #156 on:** April 21, 2016, 10:34:39 AM »

Quote from: troybilt;66816

Yes that's they way all my 450r boxes now, tbone was suggesting I do that the same with the 250r box. I'll work on it, but I'm trying to also keep the costs in line as well.

I was just curious because when I was looking at the 450r box my buddy bought, it looked like you made them convertible from eliminator to airbox. That's a cool feature even though i'd never ever run it like that. Whatever's easier and cheaper for you

troybilt · « **Reply #157 on:** April 21, 2016, 10:38:44 AM »

Quote from: rablack21;66814

Don't hybrid quads use 250r filters?

Its all over the map. That's another area of improvement as well. My YF450Z laeger originally used an LT500 boot with 250r filter, then I converted it to Mike's box and stock yfz450 intake and prodesign ring/filter. That was a step in the right direction. I can get a 450r filter to fit the R, but... still toying with that idea.

troybilt · « **Reply #158 on:** April 21, 2016, 10:42:04 AM »

The problem you'll find with the stock 250r intake on big bores especially, is the intake pulse is much stronger and can collapse or pinch the intake boot. Among other things, you loose intake energy when the intake boot is flexible like that...

troybilt · « **Reply #159 on:** April 21, 2016, 10:43:36 AM »

That's why the carbon fiber makes a good material for intake boots, very rigid.. (as long as you can get it to fit...etc...) Its also a good insulator from heat.

rablack21 · « **Reply #160 on:** April 21, 2016, 10:51:58 AM »

Troy,
I'm sure what you end up with will work very well. I am confident of that.

dem3500 · « **Reply #161 on:** April 21, 2016, 10:59:16 AM »

id really be interested in a boot. i have a 363 with a oe fit aluminum box that i have a ton of time into modifying so it will work better/how i want it to so i dont want to buy a new box but the boot is really restrictive. if the plastic boot would fit around my shock id buy it in a heart beat but id be concerned about it rubbing the shock and since its not flexible it would rub a hole in it. am i over thinking this? is just see a rigid boot causing problems if my setup isnt 100% correct and in all the oe locations. is there any flex at all in the plastic boot?

troybilt · « **Reply #162 on:** April 21, 2016, 11:16:48 AM »

Depends on the plastic, I've got a couple options on plastic. The boot that is in the picture is 6 ply silicone rubber reinforced with wire, so its fairly rigid moreso than stock, but flexible enough to install it. The 250r is not unique in that it all bikes rear shocks clearances are of a concern...

troybilt · « **Reply #163 on:** April 21, 2016, 11:17:55 AM »

The other thing that needs to be realized is the R will respond to intake changes in the power curve almost as well as the 450r's if not more so.

troybilt · « **Reply #164 on:** April 21, 2016, 11:18:31 AM »

I'm not just making a stock replacement boot, that's not the point, there is plenty of those out there for that.