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General Category => Modifications => Topic started by: VaughanCustoms on July 08, 2013, 07:11:42 AM

Title: Went on a little bit of a diet this weekend.
Post by: VaughanCustoms on July 08, 2013, 07:11:42 AM
So I continued the streetfighter kind of look this weekend. I put the front fender on a diet and desided to take the rear mud guard off. I think its starting to get a pretty cool look. I want to figure out a way to cut maybe like 2-3 inches out of the subframe but I do want to keep her a two seater. I ordered a small front faring to go on the front. I will mock it up and see what she looks like.

The front end is still torn apart btw.
(http://i1360.photobucket.com/albums/r644/MVaughan88/IMAG0514_zpsc1b75437.jpg) (http://s1360.photobucket.com/user/MVaughan88/media/IMAG0514_zpsc1b75437.jpg.html)

(http://i1360.photobucket.com/albums/r644/MVaughan88/IMAG0515_zpsd9898d62.jpg) (http://s1360.photobucket.com/user/MVaughan88/media/IMAG0515_zpsd9898d62.jpg.html)
Title: Re: Went on a little bit of a diet this weekend.
Post by: Grey runner on July 08, 2013, 09:28:04 AM
How about a different seat and then you could lose the rear hump and light cluster? There are plenty of options for rear lights on ebay.

http://www.ebay.com/itm/Universal-Motorcycle-LED-Rear-Brake-Tail-Plate-Light-License-Plate-Light-Bracket-/251298562485?pt=Motorcycles_Parts_Accessories&hash=item3a828fc1b5&vxp=mtr (http://www.ebay.com/itm/Universal-Motorcycle-LED-Rear-Brake-Tail-Plate-Light-License-Plate-Light-Bracket-/251298562485?pt=Motorcycles_Parts_Accessories&hash=item3a828fc1b5&vxp=mtr)
Title: Re: Went on a little bit of a diet this weekend.
Post by: VaughanCustoms on July 08, 2013, 09:38:17 AM
This is true but to be honest I really like the rear tail piece with the hump and the little spoiler. I guess eventually I will either have to figure something out or make some compromizes.
Title: Re: Went on a little bit of a diet this weekend.
Post by: FJscott on July 08, 2013, 10:02:17 AM
Looking good, love the color. I think the FJ makes a good candidate for a streetfighter morph.

Scott :drinks:
Title: Re: Went on a little bit of a diet this weekend.
Post by: VaughanCustoms on July 08, 2013, 10:47:38 AM
Yeah I think it will be pretty sweet when its done. If I had gotten the bike as a original I would prob leave it alone but it would cost me more to put it back to stock then making it my own so I am just going to keep going with it. I think when I do the actual finish paint work (this is just a temporary I did with a spray gun real quick in my garage) I will do maybe a shade or two darker on the orange and do a metalic.
Title: Re: Went on a little bit of a diet this weekend.
Post by: fj11.5 on July 08, 2013, 05:54:40 PM
Looking cool :good2:, how did you modify the rear fended, cut it off level with the tail piece, or remove the whole section
Title: Re: Went on a little bit of a diet this weekend.
Post by: fj1289 on July 08, 2013, 11:27:36 PM
Always thought an FJ street fighter needs a set of scoops like Triumph used on the Speed Four:

(http://fjowners.com/gallery/5/171_08_07_13_10_21_08.jpeg)

Awesome start!  Hope you've taken good pics and do a project thread... Please!
Title: Re: Went on a little bit of a diet this weekend.
Post by: VaughanCustoms on July 09, 2013, 07:24:19 AM
I just removed the whole thing. Now I have to find a new place to mount my tag though lol. Yes you just gave me a idea. I dont really like those scoops but I like the idea, I am going to search around and see what I can find.
Title: Re: Went on a little bit of a diet this weekend.
Post by: HARTLESS on July 09, 2013, 11:07:52 AM
Quote from: VaughanCustoms on July 09, 2013, 07:24:19 AM
I just removed the whole thing. Now I have to find a new place to mount my tag though lol. Yes you just gave me a idea. I dont really like those scoops but I like the idea, I am going to search around and see what I can find.
just remember, if you ride in the rain everything under your butt is going to get all nasty and wet. I was going to do the same but I commute to work on my bike and i decided that it already gets muddy enough, so i just cut it flush. nothing a dremel cant handle and i kept the license plate holder on to solve that propblem. my .02 cents
Title: Re: Went on a little bit of a diet this weekend.
Post by: VaughanCustoms on July 09, 2013, 11:40:25 AM
Lol did not think about that but I dont really plan on riding in the rain I will take one of the cars. I kind of like the look of the axle mounted lisence plate holders so I think I will go that route. I may put it back on to be on the safe side though lol. Thanks for the info.
Title: Re: Went on a little bit of a diet this weekend.u
Post by: fj11.5 on July 09, 2013, 04:23:20 PM
Cutting flush seems the way to go, had wondered about mounting the licence plate, there's some cool ones on ebay, if I didn't allready have the twin xjr tail lights id go with the tail light/ plate bracket set up
Title: Re: Went on a little bit of a diet this weekend.
Post by: Firehawk068 on July 09, 2013, 10:54:09 PM
One thing to think about.....................The FJ was designed with the fairing scoops that direct air to the top of the cylinder head for cooling.....
I am not sure how hot the engine would get running around without the air scoops in place?

love the paint colors though...
Title: Re: Went on a little bit of a diet this weekend.
Post by: ribbert on July 09, 2013, 11:09:12 PM
Quote from: Firehawk068 on July 09, 2013, 10:54:09 PM
One thing to think about.....................The FJ was designed with the fairing scoops that direct air to the top of the cylinder head for cooling.....
I am not sure how hot the engine would get running around without the air scoops in place?


Too hot!

FJ's have a tendency to run hot anyway. Those scoops are not cosmetic.

As I have mentioned before, I have good reason to believe the centre cylinder heads, with the ducts, are more efficiently cooled than the outsided ones or at worst, just as well.
Without the ducts you are removing nearly all the airflow to the middle of the head.

Make or adapt something cool looking if you want but you need good airflow to the middle cylinders.

Noel
Title: Re: Went on a little bit of a diet this weekend.
Post by: VaughanCustoms on July 10, 2013, 07:00:20 AM
You have to realize to though that I don't have the big front fairing blocking air to the motor too though. I just have headlights on the front of my FJ and nothing else so the motor is definatly getting alot of air. I do plan on working something up though.
Title: Re: Went on a little bit of a diet this weekend.
Post by: skymasteres on July 10, 2013, 10:56:29 AM
Quote from: VaughanCustoms on July 10, 2013, 07:00:20 AM
You have to realize to though that I don't have the big front fairing blocking air to the motor too though. I just have headlights on the front of my FJ and nothing else so the motor is definatly getting alot of air. I do plan on working something up though.

You know, if you look at the ducting on general aviation aircraft you'll notice that they don't subscribe to the "It's hanging out there and it get's a lot of air" mentality. They are at the cutting edge with air cooling because it is so critical for them.  As a general rule of thumb you want 4x the about of cooling out outlet than intake. So if you have 4 square inches of duct face going in you want to have 16 square inches coming out.

The ducts on the FJ work so well because they are designed along this principle. (Small inlet, lots of outlet area) The problem with lots of inlet area is that you get stagnation and hot spots. (Plus the huge drag penalty. But that's more important for airplanes) A well designed cowling for an air cooled engine you can actually acheive mesureable amount of net posative thrust.
Title: Re: Went on a little bit of a diet this weekend.
Post by: VaughanCustoms on July 10, 2013, 11:52:34 AM
I got a couple random parts when I bought my bike and I have one air duct in this box but is there like a piece that goes on the inside to direct the air to the cylinder head or does it just funnel in air just through that outer piece? Anyone have any pictures of it?
Title: Re: Went on a little bit of a diet this weekend.
Post by: FJmonkey on July 10, 2013, 07:28:37 PM
There is the exterior scoop that collects the air and an inner duct piece the directs it to the nearest inner part of the cylinder head.

http://www.ronayers.com/FAIRING-1-C287696.aspx (http://www.ronayers.com/FAIRING-1-C287696.aspx)
Title: Re: Went on a little bit of a diet this weekend.
Post by: ribbert on July 10, 2013, 08:07:53 PM
Quote from: skymasteres on July 10, 2013, 10:56:29 AM
As a general rule of thumb you want 4x the about of cooling out outlet than intake. So if you have 4 square inches of duct face going in you want to have 16 square inches coming out.

The ducts on the FJ work so well because they are designed along this principle. (Small inlet, lots of outlet area)

I understand that if you reduce the size of the outlet to 25% of the size of the inlet you increase velocity, but how does it increase volume?

Also, the FJ ducts go from large to small, not "small inlet, lots of outlet area"

Noel
Title: Re: Went on a little bit of a diet this weekend.
Post by: skymasteres on July 10, 2013, 08:25:30 PM
Quote from: ribbert on July 10, 2013, 08:07:53 PM
Quote from: skymasteres on July 10, 2013, 10:56:29 AM
As a general rule of thumb you want 4x the about of cooling out outlet than intake. So if you have 4 square inches of duct face going in you want to have 16 square inches coming out.

The ducts on the FJ work so well because they are designed along this principle. (Small inlet, lots of outlet area)

I understand that if you reduce the size of the outlet to 25% of the size of the inlet you increase velocity, but how does it increase volume?

Also, the FJ ducts go from large to small, not "small inlet, lots of outlet area"

Noel


Okay, so I royally botched my english there. You're right about the duct itself. It does taper which has a negative effect on volume but it does increase velocity. (Here they hve a huge amount of possative pressure to work with so I think the drag penalty was low on the list of optimization factors. Shooting for maximum cooling effect I tyhink) When I said lots of outlet area, I was including the area from the heads on. Not just the small outlet for the scoops. (It's not like the air stops there) In fact, the air pis rushing by the fins on the cylinder heads creating a low pressure region that would draw the air from the center out.


(I HATE the way the text editor on this site bounces UP AND DOWN like a mouse on crack!!!)