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Message started by vandaman on 01/02/19 at 11:44:53

Title: Custom intake
Post by vandaman on 01/02/19 at 11:44:53

Anyone know anything about this intake setup, e.g. Parts used. I would love to utilize this set up on my current rebuild. Thanks

Title: Re: Custom intake
Post by DieselBob on 01/02/19 at 19:02:36

Until someone with actual knowledge responds, I'm happy to play the guessing game.

If it were duller, I'd think it was a bend of radiator hose. But given how shiny it is, I'll go with the some variation of the Home Depot option below (also available in chrome, white, brass or oil-rubbed bronze).

https://www.homedepot.com/p/2-in-ABS-DWV-Return-Bend-C5879HD2/100345955

Title: Re: Custom intake
Post by Ruttly on 01/02/19 at 21:27:46

I'm thinking turbo hose maybe 2 elbows. I would rather see the filter more forward and not sucking hot air off the engine.
HaHa no knowledge here , just two cents worth of opinion !

Title: Re: Custom intake
Post by batman on 01/02/19 at 21:34:49

Look at the post, Inlet Manifold, started by Zipdachimp, 10 posts below yours . Note my directions to -tuneing your intake - started by me on 6/30 16 @ 18:51
You can find it by going back to the first page of this section, looking to the upper left side of the page you'll see the page numbers,123...907 (currently) click on one of the periods between the page numbers and a new page will pop up with all the numbers between 1 and 907, click on page 77(currently) and scroll down finding the post by using batman or the date and time. read and learn like I did . the length of the pipe you use is important , as it will improve(EV) hp at certain rpms (tunable by length) and is present at those rpms, in any gear. when using the charts ,dividing the rpm by 66.7 will give you approx. speeds(stock gearing). I used 2" schedule 40 pipe as it is both strong and has nearly the same inside diameter as the stock CV carb.

Title: Re: Custom intake
Post by Dave on 01/03/19 at 03:17:33

I bet DieselBob is correct about what the air cleaner bend is made from.

That air cleaner is in a really bad spot if you decide to ride in the rain......the bike it is mounted on is likely just used on dry days, as both tires are going to throw water all over you anyhow.

Title: Re: Custom intake
Post by batman on 01/03/19 at 05:06:58

That's true. you can however place an elbow on the intake on that bike an run the filter behind the battery box where it is protected. I ,myself gutted and altered the stock air box ,ran the intake inside and moved two" Öldfellers " custom filters to the outside , one built in the door behind the right side cover,and one in the rear between the frame rails just in front off the rear fender. This allows you to still run the breather tube to the air box and the intake to be weather protected. The bike appears to be to be stock.

Title: Re: Custom intake
Post by DieselBob on 01/03/19 at 05:42:13

Quote:

(also available in chrome, white, brass or oil-rubbed bronze)

I failed to mention it's also available in cast brass. But seriously, is there really a 12 year old child in the Hunan Province rubbing that bronze with an oil-soaked rag?

Title: Re: Custom intake
Post by batman on 01/03/19 at 12:04:42

ABS is more ridged than PVC and tends to deform in sun light. Neither of these things endears me to it's use on my motorcycle.

Title: Re: Custom intake
Post by LANCER on 01/05/19 at 03:38:07

3C3F2A333F306A665E0 wrote:

ABS is more ridged than PVC and tends to deform in sun light. Neither of these things endears me to it's use on my motorcycle.

Yep, did that a time or two; not a good result.

Title: Re: Custom intake
Post by playhard67 on 01/07/19 at 15:22:46

This may work for you. It's the same diameter (2.25 in.) as the carb outlet. I purchased the 45 degree one. I am hoping to install it this weekend using a K&N cone filter.

https://www.amazon.com/gp/product/B01CZTGTIK/ref=oh_aui_detailpage_o02_s00?ie=UTF8&th=1

Title: Re: Custom intake
Post by batman on 01/07/19 at 18:29:15

We have 40 mm carbs stock , 40 mm = 1.57 inches. the pipe above being 2.25inches OD=57.15mm the wall thickness being .065"x2 makes the ID 57.02 mm , 17mm too large.
The object of extending the intake is to increase the amount, and velocity of air /fuel mix through the carb, a too large intake pipe will have a mass of air that is hard to accelerate ,and performance will fall off at mid to high rpm , it is better to have a slightly to small intake pipe as velocity doesn't fall of as fast.

Title: Re: Custom intake
Post by playhard67 on 01/07/19 at 18:59:00

Not sure why we have differences. Looking the the carb with calipers.... OD is 57mm (don't know if it is stock or not). Airbox - OD is 62mm. The pipe I listed above - OD is 57mm. I know the ID's are a bit difference because the pipe is a thin wall... but certainly not 17mm.

What am I doing wrong?

I read an older thread on intake size...etc. Me, I'm just looking at increasing the air by using the cone. I'll increase the exhaust by trimming down the port. Then I'll get the carb rejetted.

What am I missing?

Title: Re: Custom intake
Post by batman on 01/07/19 at 19:21:56

You need to be looking at the carb's inside diameter ,the air/fuel mix doesn't care what the outside of the carb measures.
If your trying to increase performance by using a cone filter ,that's probably not going to happen ,cone filters are usually used because their pretty, not because they perform or filter better.

Title: Re: Custom intake
Post by playhard67 on 01/07/19 at 19:29:06

I was strictly looking at it from a rubber (2.25 in. hose) connection point...pipe to carb using external dimensions. And, yes I am going with the cone for looks. For me, I don't need a high performance bike. Thanks for the correction on the 40mm. For me, there's a lot to learn on this site.

Title: Re: Custom intake
Post by LANCER on 01/08/19 at 04:36:13

If you are going to use an elbow to mount the carb then you need an aluminum mounting flange & tube, welded together for stability. If not, vibration will make it unworkable.
The one I made of abs also had a metal mount on the top of the carb to the frame to add additional stabilization but it broke within 2 days riding the Dragon. Barely made it back to the motel.
When you have a rubber mounting flange it just does not hold the weight of a carb way out on the end.

Title: Re: Custom intake
Post by batman on 01/08/19 at 08:44:43

5E424F57464F5C4A18192E0 wrote:

Use of am extended intake on your stock motor, will not give you a high performance bike. I estimate a gain of between 1-2 hp if done correctly. but I was trying to warn you ,if done incorrectly you could actually lose performance, That may at first glance, not seem important, but in a passing situation on the highway your bike that before attained 85 mph, may now attain only 70 to 75 mph and be slower(require more time and distance) getting there , passing now becomes less routine and more dangerous .

Title: Re: Custom intake
Post by playhard67 on 01/08/19 at 19:21:36

As I said...I am not looking for a high performance bike. I am sure I will be fine with whatever I end up with. It may end up being trial and error for me...but, I'll get there.

When I ride on the highway, I am usually riding with my wife and my dog (yes my dog rides with me). I have two other bikes I use for this purpose. Both bikes will allow the wife and dog to ride with me. When I ride the Dragon, I take one of these bikes.

This bike will be a single rider bike and will be used for mostly farm road / back road use. I'm not worried about passing someone at 85mph. I appreciate your warning... but, I think i'll be fine.

Title: Re: Custom intake
Post by batman on 01/08/19 at 20:26:51

That's fine ,but I wouldn't be using a cone filter for riding of that type ,they would need frequent cleaning/oiling and don't filter as well as ,say a foam filter used on dirt bikes for off road or dirt track racing.
while the cone filter is very free flowing, it may be because it only filters out large particles ,it would be the last filter you should use for your intended use.