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Crossover Pipe idea

guzzisti91

Tuned and Synch'ed
Joined
Feb 2, 2018
Messages
79
Location
Villawood
Hey all, i have seen a few crossover pipes online that replace the canister "expansion chamber", & i've read some posts on this site by people who have installed them, but they cost around $60-$90, & appear to be little more than a piece of stainless steel pipe. With this in mind, i'm thinking of going into bunnings & making my own from normal steel pipe. Would this work?
 

john zibell

Moderator
Staff member
GT di Razza Pura
Joined
Oct 28, 2008
Messages
8,758
Location
Huntsville, AL
It would work, but it would rust. Also when you calculate your time to fabricate the part you may be ahead of the game to just purchase one already made.
 

guzzisti91

Tuned and Synch'ed
Joined
Feb 2, 2018
Messages
79
Location
Villawood
It would work, but it would rust. Also when you calculate your time to fabricate the part you may be ahead of the game to just purchase one already made.
Fabricating one from good quality steel will take me less than 30min at quarter the cost of purchasing ready made + shipping, then waiting more than 2 weeks for it to arrive. This is what Sydneysiders have to deal with when they want nice things - make it yourself or spend big & wait ages for the priveledge. Thanks, i'm off to bunnings.
 

kiwi dave

GT Reference
Joined
Oct 28, 2008
Messages
2,226
Location
Auckland, New Zealand
Be prepared to have to adjust the fueling after this replacement, adding to any costs, You don't say what model you've got, but I notice the post is in the small block section.
 

guzzisti91

Tuned and Synch'ed
Joined
Feb 2, 2018
Messages
79
Location
Villawood
Be prepared to have to adjust the fueling after this replacement, adding to any costs, You don't say what model you've got, but I notice the post is in the small block section.
It's a 2002 Nevada. All my threads get directed to the small block section. A colleague of mine tells me no re-jetting is necessary when fiddling with the exhaust, the other threads i saw reported seeing no difference other than gearbox sump access, & another site says when it does, it is a valve timing issue, but only when their negative pressure systems are installed. But if you are right, i'll simply reinstall the factory chamber.
 

john zibell

Moderator
Staff member
GT di Razza Pura
Joined
Oct 28, 2008
Messages
8,758
Location
Huntsville, AL
Just changing the crossover probably won't require re-jetting. If changing from the stock mufflers, then it would probably be necessary.
 

kiwi dave

GT Reference
Joined
Oct 28, 2008
Messages
2,226
Location
Auckland, New Zealand
I put a crossover pipe on my first Guzzi, a 1995 California 1100 with carburetors. The bike lost all its low down power. I raised the needles a notch, this helped but the issue was still there at lower openings. Perhaps replacement sliders with less cutaway might have improved things, but instead I reverted back to the colostomy bag. No further problems.
 

john zibell

Moderator
Staff member
GT di Razza Pura
Joined
Oct 28, 2008
Messages
8,758
Location
Huntsville, AL
I put a crossover pipe on my first Guzzi, a 1995 California 1100 with carburetors. The bike lost all its low down power. I raised the needles a notch, this helped but the issue was still there at lower openings. Perhaps replacement sliders with less cutaway might have improved things, but instead I reverted back to the colostomy bag. No further problems.


The small block unit is much smaller than what was put on the 1100s. Basically just a much larger center piece that was oval instead of round. going to a straight piece shouldn't matter. When I put a crossover on my MKV Lemans to replace the pre-muffler re-jetting wasn't required.
 
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