Topic: MessnerMoto - CB750 f2 - Some Parts are now available from build!!

[MessnerMoto]

you are reading my mind This is what I tied but if you think about it there are angles measurement involved... Ports openings are angled in 2 axes compared to top surface of the head. But maybe I can stick straight 35mm tube in to a port and then measure closer to neck axes...

[MessnerMoto]

I managed to measure exhaust port positions relative to frame(with  good precision I hope)

One question regarding the muffler exit position before I send exhaust tubes for bending. I am still questioning position of mufflers relative to  chain and rear tire. I am afraid that vapor and heat will have bad impact on chain and tire. Any opinions ?





 

[MessnerMoto]

That shouldn't be an issue given that while riding, wind will take the exhaust gas straight away. Only while sitting and idling will the chain be subjected to heat radiating from the exhaust. I don't expect you're planning on sitting traffic too much 

Exactly the issue is while idling... And I am more concerned with water vapor then heat. As we now more then half of product from gas combustion is water vapor

[Lostboy Steve]

Ok... now 3D print a model of it. this is #$%*ing awesome!


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[Medyo Bastos]

Ok... now 3D print a model of it. this is #$%*ing awesome!


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yeah, mirk has things going on here 

[Lostboy Steve]

That shouldn't be an issue given that while riding, wind will take the exhaust gas straight away. Only while sitting and idling will the chain be subjected to heat radiating from the exhaust. I don't expect you're planning on sitting traffic too much 

Exactly the issue is while idling... And I am more concerned with water vapor then heat. As we now more then half of product from gas combustion is water vapor

Yeah but modern chain lubes are great. I don't think that will be an issue at all. If you use a standard RK black chain you'll probably have a bit of rust residue anyway just because that's what they do.

Seriously, push that program through a 3D printer and make 1/10th scale models for us?





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[MessnerMoto]

It goes directly to CNC tube bending. There is no need for mid steps

[SOHC4 Cafe Racer Fan]

Straight pipes or baffled?

[MessnerMoto]

I designed pipes so they can be fitted with
1.375" ID
1.375"x2.88"x8.50"L
2.88"x 1.375"x 2.0"L
12" OAL. MS perforated core w/SS wool wrap.
MC-1375-12-SS

coneeng mufflers. They are really expensive. 100$ per muffler. They are straight cores.... I would like baffled version and cheaper

[SF]

It goes directly to CNC tube bending. There is no need for mid steps

That's quite the process! Very cool


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[Godffery]

I'm thinking longer would be better. 
Perhaps You could have the pipes made longer, then cut them down later if desired ?

[seanbarney41]

I'm thinking longer would be better. 
Perhaps You could have the pipes made longer, then cut them down later if desired ?

+1, The exhaust will not hurt the chain or tire but I think you will be losing some low and mid range  with them that short. 

[MessnerMoto]

I'm thinking longer would be better. 
Perhaps You could have the pipes made longer, then cut them down later if desired ?

+1, The exhaust will not hurt the chain or tire but I think you will be losing some low and mid range  with them that short. 

Some things need to be sacrificed for the looks I have an idea how to connect all for pipes to get something like 4-2-1 maybe that would help

[seanbarney41]

I think longer pipes are gonna look better too.

[bwaller]

CNC bending....man I'm a mile behind on all the cool processes happening. The pipes look cool indeed and I appreciate how well they're tucked up for clearance, nice work. This from a guy that builds trial & error by eye!

However while you're "on the drawing board" have you added more length with some gentle curve on the muffler end to see how that looks? Still tightly tucked in of course!    A nice 4-2-1 would surely be cool as well. Keep up the good work.

[palepainter]

I love following along with this build.  It makes me feel like a caveman with sticks and stones trying to craft a cart to pull behind an ox.   

[754]

My buddy. ( who has a bodyshop)
Refers to ... when working with minimal tools..
 As ..working with a Stick and a Carrot.......lol..

[MessnerMoto]

I am using this "new" tools because I am lazy and it is relatively cheap.... And it is cleaner... siting in front of screen

 But i am pretty sure that original pipes or part of pipes have been bent on NC(numerically controlled) tube benders... Old technology..

Thanks to all who help clear muffler position doubts...

I gained some pipe length in front. At front of the frame pipe is really curved... I will still decide should I connect all 4 pipes somehow. I have an idea and it is easy to do... Of corse it will not be visible

[Godffery]

I will still decide should I connect all 4 pipes somehow. I have an idea and it is easy to do... Of corse it will not be visible

 When you say "Connect all 4 pipes" is that as in brackets? or crossover pipes?

[MessnerMoto]

Yes... crossover.

[SOHC4 Cafe Racer Fan]

Yes... crossover.

Damn that sounds even cooler!!

[Godffery]

 That gets pretty tricky.

[MessnerMoto]

I posted this here http://forums.sohc4.net/index.php?action=post;msg=1873223;topic=162721.0

This is VFR800/R6 stator stator/rotor conversion I've done ....

[Godffery]

  ...!

[SOHC4 Cafe Racer Fan]

Very cool.  Are you converting to EFI?