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slightlydodgy
Blaster class
Joined: 08 Apr 2012
Posts: 148
Location: Taranaki NZ
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 Posted: Fri Jul 13, 2012 6:06 am Post subject: inlet manifold |
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One of my project bikes has a minor problem the carb is going to hit the frame and I dont have any more frame room (already cut and welded) I was going to attempt to make a new carb manifold with a slight angle Are there any guidllines I should follow? Is there such a thing as to much angle ?Can I shorten the manifold gap (about 1 1/2 inches at the moment) etc? Any input would be appreciated Thanks Pete
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The Day Starts With OZATV !
Joined: 09 Sep 2006
Posts: 1518
Location: Middleton SA
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| Posted: Fri Jul 13, 2012 9:45 am Post subject: |
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There are no real strict rules for manifolds, so pretty much anything will work.
Longer runners can deliver a more torquey feel or shift power down the rev range.
Shorter runners can deliver more crisp throttle response and slight improvements in top end.
How much is your carby hitting by?
Sometimes facing the original manifold on an angle at the face where it bolts to the head will give enough clearance.
1mm taken off one side at the front could mean 10mm at the back of the carby.
Just hack it off on an angle until you get that angle right and then draw file it flat.
You may have to watch the angle the mounting bolts go through.
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slightlydodgy
Blaster class
Joined: 08 Apr 2012
Posts: 148
Location: Taranaki NZ
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| Posted: Fri Jul 13, 2012 7:10 pm Post subject: |
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i might give that a go but I'll make sure that I make up some templates of the original flanges incase I screw it up. Hopefully I only need 10 -15 mm at the back of the carb
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The Day Starts With OZATV !
Joined: 09 Sep 2006
Posts: 1518
Location: Middleton SA
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| Posted: Fri Jul 13, 2012 9:48 pm Post subject: |
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Sometimes you can change the carb angle by slotting the mounting holes in a cresent shape so that the manifold can be twisted (rotated) on the head mounting face.
Also check for different models with the same motor, or any chinese copy engines. They often use different manifold set ups.
Having said that, there are many common mounting paterns around, or ones from diferent manufacturers that are close enough that you may only have to slot the two holes a bit.
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dangerman4
Roostin Away
Joined: 31 Mar 2007
Posts: 854
Location: Morphett Vale
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| Posted: Sat Jul 14, 2012 9:20 am Post subject: |
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Take a pic for us of the problem.
Then its easier to give you the best answer |
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