1100i straight piping


Information and questions on GL1100 Goldwings (1980-1983)
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Chewy
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1100i straight piping

Post by Chewy »



I am thinking about straight piping my Wing.
1. Has anyone done this?
2. How did it sound?
3. How does it affect engine performance?



Good Hondog
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Motorcycle: 1980 GL1100 Interstate
1978 GL1000

Re: 1100i straight piping

Post by Good Hondog »

Bad idea. You'll end up with less power than stock and you'll never tune it to run right. Besides that, any bike with straight pipes sounds like a broken piece of crap when it's riding down the road.

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DenverWinger
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Re: 1100i straight piping

Post by DenverWinger »

I've run the engine firing straight out of the heads when bike was in stages of re-assembly. Didn't care for the noise, would rather hear the stereo... And as stated, correct tuning depends on the back pressure, won't run right without it.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

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Chewy
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Re: 1100i straight piping

Post by Chewy »

That's no good.

Another question:

What is the reason for the crosspipe?

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DenverWinger
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1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: 1100i straight piping

Post by DenverWinger »

Think it helps balance out the back pressure between cylinders on each side... The way these wings are set up the two cylinders fire on one side consecutively (front then rear), then the two on the other side consecutively (rear then front).

Before I sold it, I noticed the exhaust on my old GL1000 was considerably quieter and mellower sounding than the 1100, instead of just a crosspipe between the sides it had a good size chamber in the middle of the exhaust linking the sides.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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WingAdmin
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Re: 1100i straight piping

Post by WingAdmin »

The crosspipe links the exhausts at a specific distance from the exhaust ports. The idea is that when the exhaust pulse from one side travels past it, it creates a vacuum at the exact right moment to help evacuate the hot exhaust gases from the next cylinder that is firing, as well as help pull in a fresh charge.

Your exhaust valves might run a bit hotter without the crosspipe (i.e. straight pipes) because that evacuation is not occurring as efficiently.

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offcenter
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Re: 1100i straight piping

Post by offcenter »

There is only one reason anyone would put open pipes on the quietest bike ever made.
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Chewy
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Re: 1100i straight piping

Post by Chewy »

Wanting to find out how I can get a little bit of a rumble out of the bike

Good Hondog
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Re: 1100i straight piping

Post by Good Hondog »

Chewy wrote:
Tue May 14, 2019 3:20 pm
Wanting to find out how I can get a little bit of a rumble out of the bike
The easiest way to make the GL1100 sound good, run good, and make more power than stock is to install a set of Mac performance exhausts with a K&N # HA-8080 air filter and, very importantly, install 1 size larger than stock main jets in the carburetors. That will give you great results and a nice mildly rumbly sounding exhaust note. It will never sound like a Harley Davidson though, so if you are trying to get that sound then just buy a Harley and leave the Goldwing as it is.

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Chewy
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Re: 1100i straight piping

Post by Chewy »

I know it'll never sound like a harley.
How hard is it to install the jets?
Do you have a part number for the exhaust?

Good Hondog
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Re: 1100i straight piping

Post by Good Hondog »

Chewy wrote:
Wed May 15, 2019 10:43 am
How hard is it to install the jets?
Do you have a part number for the exhaust?
It's easy to install jets. Just time the modifications to when you're already going to clean and rebuild your carbs.That way you're doing two things in one job. You'd normally be taking the jets out of the carb bodies as part of the cleaning process anyway, so just reassemble with the larger jets at that time. The exhaust systems are available in two styles from Mac. Mine is the 4 into 2 system with turn down ends. It's part number 001-4218. The other one is also a 4 into 2 system with mufflers that go straight back with slash cut ends. It's part number 0011084.

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Chewy
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Re: 1100i straight piping

Post by Chewy »

Good Hondog wrote:
Wed May 15, 2019 11:29 am
Chewy wrote:
Wed May 15, 2019 10:43 am
How hard is it to install the jets?
Do you have a part number for the exhaust?
It's easy to install jets. Just time the modifications to when you're already going to clean and rebuild your carbs.That way you're doing two things in one job. You'd normally be taking the jets out of the carb bodies as part of the cleaning process anyway, so just reassemble with the larger jets at that time. The exhaust systems are available in two styles from Mac. Mine is the 4 into 2 system with turn down ends. It's part number 001-4218. The other one is also a 4 into 2 system with mufflers that go straight back with slash cut ends. It's part number 0011084.
Do you have a YouTube video of how it sounds?

Good Hondog
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Re: 1100i straight piping

Post by Good Hondog »

No, sorry I don't have a video of my bike running, but It sounds a lot like "Vrrooom....Vrrooom. :lol:

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Chewy
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Re: 1100i straight piping

Post by Chewy »

If I just remove the baffles from my pipes will that affect performance?

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Chewy
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Re: 1100i straight piping

Post by Chewy »


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winguyjo
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Re: 1100i straight piping

Post by winguyjo »


utenka
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Re: 1100i straight piping

Post by utenka »

well you asked, reddit delivered, kinda. i found this on /r/motorcycles and thought of you OP. A GL1100 straight piped. Keep in mind you'd need to seriously massage the jetting, pilot screw, among others to get it to run correctly. IMO leave it, but it's your ride, do what makes you happy.

https://old.reddit.com/r/motorcycles/co ... he_waythe/

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Chewy
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Re: 1100i straight piping

Post by Chewy »

I only ask because my exhaust is a little shot and I know that a lot of Harleys and such and even some Honda's that I've seen are straight pipe with no baffles or anything like that. but I didn't know if that would be a cheap easy way of me to fix my exhaust.

utenka
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Re: 1100i straight piping

Post by utenka »

well that's a different question. yeah there probably is a way. what's wrong with the exhaust?

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Chewy
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Re: 1100i straight piping

Post by Chewy »

The exhaust tip on the left side is rusted completely off oh, and the other side the chamber part is rusting through on the outside

utenka
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Re: 1100i straight piping

Post by utenka »

well, there's a couple things that range in price and quality. here's what I would do in order of preference:

1. the best but most costly is buy a new (used) exhaust.

2. take the exhaust off yourself (should be an article in the how-to section, or on youtube), then take it to a muffler shop to get new pieces welded on.

3. buy a repair kit from an autoparts store, and apply it. this has never resulted in a great seal for me, and looks like ****.

4. chop the exhaust and buy new tips from a site like dimecitycycles.com or eBay. you'll need to reject probably unless you get stock tips somehow.

5. straight pipe it and go through that hassle.

as long as the headers (the parts closest to the engine) aren't coroded through, it's solvable. if they are, it still is, only with the first three options though.

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Chewy
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Re: 1100i straight piping

Post by Chewy »

I ended up buying three different types of Harley pipes for really cheap so I'm going to play around with those on my extra motor to see which one I prefer.



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