Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66cc)

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BranLaz

New Member
Sep 21, 2011
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San Diego, CA
So while looking at other peoples custom motorized bike I noticed that some people motors (2-stroke motor) have their exhaust manifold facing towards the rear tire (where the Intake manifold/carb would be) rather than having it face down (where the exhaust would usually)

So my question:

Did the motorkit specifically come like that

OR

Can I just switch positions?


Reason for this: The exhaust manifold position would be better for making a custom exhaust.

Thanks!
 
Al.Fisherman

Al.Fisherman

New Member
Sep 9, 2009
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Calera, Alabama
Re: Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66

BranLaz said:
So while looking at other peoples custom motorized bike I noticed that some people motors (2-stroke motor) have their exhaust manifold facing towards the rear tire (where the Intake manifold/carb would be) rather than having it face down (where the exhaust would usually)

So my question:

Did the motorkit specifically come like that

OR

Can I just switch positions?


Reason for this: The exhaust manifold position would be better for making a custom exhaust.

Thanks!
Click to expand...
If you want to change from what you are accustomed at seeing, dig out a welder.

 
MotorBicycleRacing

MotorBicycleRacing

Well-Known Member
Jul 28, 2010
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SoCal Baby!!!
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Re: Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66

BranLaz said:
So while looking at other peoples custom motorized bike I noticed that some people motors (2-stroke motor) have their exhaust manifold facing towards the rear tire (where the Intake manifold/carb would be) rather than having it face down (where the exhaust would usually)

Did the motorkit specifically come like that
Click to expand...
No, the kit does not come like that.

BranLaz said:
Can I just switch positions?
Reason for this: The exhaust manifold position would be better for making a custom exhaust.
Click to expand...
You need to rotate the cylinder and piston 180'
Also the transfer ports need to be matched for the motor to perform
properly.

If you come to SoCal Oct 22nd race in Apple Valley you can see
bairdco race his reversed engine Grubee Starfire that has been
tricked out with all kinds of mods.
 
B

BranLaz

New Member
Sep 21, 2011
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0
San Diego, CA
Re: Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66

MotorBicycleRacing said:
You need to rotate the cylinder and piston 180'
Also the transfer ports need to be matched for the motor to perform
properly.

If you come to SoCal Oct 22nd race in Apple Valley you can see
bairdco race his reversed engine Grubee Starfire that has been
tricked out with all kinds of mods.
Click to expand...
Thanks! Thats what I was wondering if I needed to rotate the piston and cylinder... Will the crank and drivetrain be affected as well?

Thanks!
 
bairdco

bairdco

a guy who makes cool bikes
Aug 18, 2009
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living the dream in southern california
Re: Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66

i cant post links from my phone but type "backwards engine experiment" into the search box and you can see one of the bikes i built a few years ago, and is still going strong today.
 
B

BranLaz

New Member
Sep 21, 2011
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San Diego, CA
Re: Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66

bairdco said:
i cant post links from my phone but type "backwards engine experiment" into the search box and you can see one of the bikes i built a few years ago, and is still going strong today.
Click to expand...
Awesome! I will!
 
B

BranLaz

New Member
Sep 21, 2011
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0
San Diego, CA
Re: Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66

Hey how did you do that filter? Thats pretty bad ass!
 
MotorBicycleRacing

MotorBicycleRacing

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Jul 28, 2010
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Re: Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66

BranLaz said:
Hey how did you do that filter? Thats pretty bad ass!
Click to expand...
Pic of the filter on Mikuni carb below.
If you want to see bairds new "blue" top secret reversed motor
ya gonna have to show up at the race.

bairdco said:
anyone want some action on the 1/8 mile race? i'm confident this will be the fastest 2 stroke china doll at the race, if not on the entire planet.
Click to expand...


 
bairdco

bairdco

a guy who makes cool bikes
Aug 18, 2009
6,537
264
63
living the dream in southern california
Re: Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66

the filter is the stock mikuni filter. the motor on the bike pictures is a 66cc GT4 grubee starfire, with a Harley (davidson) Aermacchi M50 head, a Mikuni VM16 carb, custom exhaust, on a 40's Colson Olympic.

the new motor MBR posted is gonna be a little more. GT4 case, GT5A jug, GT4 head, SKF bearings, Wiseco piston, balanced crank, and some extra special mods. gotta build an expansion chamber and a manifold for the mikuni, and then it'll be ready.

we GPS'd my last motor at 54mph, then i caught up to traffic. my phone GPS had it at 62. then it exploded.

my new motor should run comfortably in the 60's. and i hope to punch out a 70+mph run at the Grange racetrack.

i know it sounds like a lot of talk, but i'm hoping to back it up. if it doesn't happen, no one can say i didn't try.

besides, who the **** else is crazy enough to go 70mph on a beach cruiser? :)
 
B

BranLaz

New Member
Sep 21, 2011
6
0
0
San Diego, CA
Re: Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66

bairdco said:
i know it sounds like a lot of talk, but i'm hoping to back it up. if it doesn't happen, no one can say i didn't try.

besides, who the **** else is crazy enough to go 70mph on a beach cruiser? :)
Click to expand...
I am :)

Im one of those guys that goes "Hmm... What if I...." and then does it and if it doesn't work "Well, at least I tried it ^^::"
 
2door

2door

Moderator
Staff member
Sep 15, 2008
16,302
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63
Littleton, Colorado
Re: Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66

"my phone GPS had it at 62. "

I want a phone like yours.

Tom
 
bairdco

bairdco

a guy who makes cool bikes
Aug 18, 2009
6,537
264
63
living the dream in southern california
Re: Reversing/Switching Positions of Exhaust Manifold w/ Intake Manifold (2-Stroke 66

there's some videos of some of my bikes on youtube, just search "bairdco."

at the race there's supposed to be a radar gun on the 950' straight, and we'll video the new bike.
 
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