Made some paper cones so that I can have a visual of 4-4 vs 4-2 exhaust.
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The Norda
- Thread starter Ratranger
- Start date
I don't know which is better from a performance standpoint, but I LOVE the look of a 4-4.
What about 4 "cocktail shaker" style mufflers? The stock CB500 exhaust had that style.
Isn't the general consensus that a well designed 4-2-1 gives best power from an inline 4? I totally agree that a 4-4 looks great, but it also comes with a weight penalty.
with a few cross overs 4 into 4 should perform well
4-4 has “the look”. Keep up the stellar work.
If it wasn't $1k for the mufflers I'd love a set of the hydroformed megaphones from Rayson's in the UK. But I guess 4 mufflers from cone engineering isn't much less. If I do 4-2 I'll have a crossover/ X-pipe after the merges.
I made a little progress on shortening the stator cover for the upgraded charging system. It's a little over an inch shorter, which isn't much but it's at one of the widest points of the engine.
I made a little progress on shortening the stator cover for the upgraded charging system. It's a little over an inch shorter, which isn't much but it's at one of the widest points of the engine.
I have been pondering the same on my RD350, as the Powerdynamo PMA/ CDI is a lot narrower than the stock alternator/ points setup.
I was unaware the H750 used a PMA. In that case, I'd recommend getting a series reg-rec.
Stock the cb750 does not, this is an upgrade using a modified r6 flywheel and the matching stator. The kit is from an SOHC4 forum member who goes by anders288. He sells it as a bolt in kit, I'm going the extra to shorten the cover.
I will be using a SH775 regulator with it, same as I run on my XS with a PMA.
Welding went better than I expected. Vapor blasting the cover probably helped. Only had a few spots where contamination bubbled out of the aluminum. And the cover stayed nice and flat.
Working on footpeg mounts. I'll probably make a custom bolt to act as a mount and brake pivot. The footpeg will be able fold up allowing use of the kicker.
Tomorrow I make an attempt at making a hydroformed megaphone. If it works I'll upload the dxf file to sendcutsend and get the pieces to make 4 megaphones for a 4-4 system. It'll cost $130 for 10 halves, only $20 more than buying the material to cut them myself.
I suppose you have seen this but if you haven't this is the best how to hydroform I have seen.
Yep, that's definitely a better video than most. A lot of the videos people just lay the pieces together and weld the edge, rather than the extra work of rolling the edges to get a butt weld.
I did learn you need to be consistent on the amount you roll the edge or you end up with some twist. I might switch to a roundover die on the bead roller if this works. That way it will be the same on every piece.
So a few lessons learned.
1. With the pump I'm using you need a really heavy wall pipe nipple for it to seal. The normal pipe nipple I used ended up cutting the seal.
2. The shape at the end partially determines how round you can get the end with just the hydroforming. So a rounded end will let it get round better, or enough extra length for it to not matter.
3. Pipe dope or teflon tape is needed for the ball valve. All the leaks I had were due to fittings, not welds (surprisingly).
Overall I'm pretty happy with it. I think I'll be able to use the DXF as is and just have extra material on the connector I weld on. There will be a reverse cone added on the end so I think the overall length and curve look good.
1. With the pump I'm using you need a really heavy wall pipe nipple for it to seal. The normal pipe nipple I used ended up cutting the seal.
2. The shape at the end partially determines how round you can get the end with just the hydroforming. So a rounded end will let it get round better, or enough extra length for it to not matter.
3. Pipe dope or teflon tape is needed for the ball valve. All the leaks I had were due to fittings, not welds (surprisingly).
Overall I'm pretty happy with it. I think I'll be able to use the DXF as is and just have extra material on the connector I weld on. There will be a reverse cone added on the end so I think the overall length and curve look good.
Here's a bigger megaphone, debating 4-1 vs 4-4. Could possibly go inbetween on megaphone size for 4-2.
Just slapped on smaller megaphones.
The smaller megaphones look better in my opinion.
... the big one is no bueno, in my eyes. But then again, your build, your eyes!
