04-10-2014, 09:36 PM #1
Polishing aftermarket pro 785 intake manifolds
So I have a few sets of intake manifolds for my 785. I have a moto marine set I got from Bob. I also got another set when I got my hot seat carbs in the mail a while back. Anyone know this second set is?
Moto marine on the left, the matching three on the right? Not sure
04-10-2014, 09:40 PM #2
- Join Date
- Aug 2006
- Homer Glen Il.
those where made by a guy / company called boswell
04-10-2014, 09:45 PM #3
Also I have been polishing up the runners on my moto marine intakes. Got the casting imperfections out with a dremel. Went from like dremel sanding wheel, to 400 grit, to 1000, 1500, then 2000. Mirror finish. To me it made sense to get them as smooth as possible. Then I'm reading around and checking out YouTube videos and find out that actually a little roughness on the intake tract is good? Is this true. Read that a little even roughness improves the efficiency. Just wondering if anyone dealt with this and knew exactly.
Will this his make a huge hp difference. Hell no. but just the satisfaction of knowing that it made a little bit of a difference. Here is the before and after on my intakes. Let me know what you guys think.
04-10-2014, 09:46 PM #4
Bob are they any good? Knew they weren't hot seat. What's weird is the reed side is like all wavy and not perfectly matched up with vforce reeds. Wondered if they were made that way for a reason or?
04-10-2014, 09:56 PM #5
Few more pics of the two. Other than the weird reed opening side. I do like how there is less of a distance from the top part of the intake tract compared to the moto marines. Should help get that air pointed up a little easier than the moto marines.
04-10-2014, 09:57 PM #6
04-11-2014, 09:27 AM #7
something to keep in mind,on a 4 stroke the intake tract leads directly into the combustion chamber,on the 2 stroke its gonna get hammered by the crank while its spinning 7000 rpm.main things to have are signal strength to the carbs,a booster than atomizes fuel and air good,and carb that flows well without losing signal strength.get those right and it'll put a smile on your face everytime.
04-12-2014, 10:47 AM #8
Thanks TX. I have hot seat carbs and vfroce 2 reeds. Should be good when I get it done. What do you mean by a booster?
And I guess my main question is on this intake tracts is it better to get the tracts mirror finish smooth or roughed up in the texture ever so slightly? Again I know it wont be a huge difference, but I have already got time into sanding and dremeling the tracts
04-12-2014, 02:58 PM #9
Just clean up the big stuff that may impede flow. The rough finish is supposed to aid in atomization. Only really applies to a 4 stroke. like tx says, with the charge passing thru the rotating assy. On the 2 strokes, There's enough turbulence to take care of that.
04-12-2014, 03:37 PM #10
I left mine at 150 but matched the intake gaskets and intake manifold. No ridges to disrupt flow.
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