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Guest
Guest
And how do the intake manifolds match the intake ports
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And how do the intake manifolds match the intake ports
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one_civic
Guest
Intake manifolds also match the intake ports, when I get home I'll measure with my digital vernier caliper and take pics
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one_civic
Guest
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one_civic
Guest
I don't know why the pics are upside down when their right side upon my computer but, oh well
intake manifold boots 32mm
intake manifold boots 32mm
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one_civic
Guest
vm29ss carb intake 33.5mmA friend gave me this 850 engine with no tensioner or carbs, only the intake manifolds, so I don't know which carbs it originally would have came with.
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Guest
Guest
With a 34mm intake port you want 36mm carbs for your best preformance. You can go as small as 34mm carbs but anything smaller will hurt the preformance of the motor. If your carbs are smaller than your intake port the when the fuel and air enter into the intake port and it expands and loses velocity the the air and fuel start to separate hurting power.
to get your carbs and manifolds to work to give you the best preformance you need to bore the carbs 1mm larger and blend the rubber manifolds carb side to the carbs and head side to the head.
I not saying it's not going to run good with the stuff the way it is but it will hurt the the preformance.
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to get your carbs and manifolds to work to give you the best preformance you need to bore the carbs 1mm larger and blend the rubber manifolds carb side to the carbs and head side to the head.
I not saying it's not going to run good with the stuff the way it is but it will hurt the the preformance.
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boris.h
Guest
Sorry I do not agree with the last answer.... for me, if intake ports are 34mm (not the valves diameter!), the carbs may end at 34mm, and also for the boots (even if you have to enlarge inside diameter of them). I agree with the fact that the speed has to increase all the way, but there are already one decrease of diameter inside the carb (to get fuel = venturi), the other important decrease of diameter is at the valve... the most important at the carbs / head interface is
- no "step" between diameters of elements
- no "increase of diameter"
- no "step" between diameters of elements
- no "increase of diameter"
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one_civic
Guest
Here is a better picture looking through the intake side of the flatslide carb, it restricts down to 32mm at the intake manifold side. I may take 1mm off around the circumference but am wondering how much material needs to be left for an airtight seal at the o-ring? either way I'm better off with the larger 34mm 850 intake port head compared to if I wanted to use my stock 750 head.
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one_civic
Guest
and one looking from the intake manifold side where you can see the 29mm offset intake throats on the airbox side
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Guest
Guest
You never ever want your carbs to be smaller than your intake port opening. Your carbs should be 1mm to 3 mm larger than the intake port for the best preformance. If your road racing then you would go to 1mm larger to help keep the air velocity up at the lower rpms and if your drag racing you want to be 3mm larger for wide open throttle. Now you can go the same size carbs as intake port size and I have seen some at the track run over 3mm larger on really high compression motors. The higher the larger the bore and compression the larger the carb can be and still maintain air velocity. If you use a carb that is smaller than your intake port you will lose air velocity every time.
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boris.h
Guest
I agree with that
On my project (gs 550/650 head and jugs / pistons), all the ports will be machined. I want to use 600 gsxr full exhaust (33mm diameter), ported head to increase the compression ratio, 550 cams... I am not decided yet if I try to put BS34 carbs, or if I keep BS32 carbs... maybe do you have any advice here?
On my project (gs 550/650 head and jugs / pistons), all the ports will be machined. I want to use 600 gsxr full exhaust (33mm diameter), ported head to increase the compression ratio, 550 cams... I am not decided yet if I try to put BS34 carbs, or if I keep BS32 carbs... maybe do you have any advice here?
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