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Post by JR on Jul 21, 2012 17:55:37 GMT -6
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Post by JR on Jul 21, 2012 17:56:40 GMT -6
if it will mount just use a "T" you will get the second port . John  |
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Post by tvnacman on Jul 21, 2012 18:00:03 GMT -6
if it will mount just use a "T" you will get the second port . John see anything you like with those eyes ? John |
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Post by JR on Jul 21, 2012 18:01:05 GMT -6
see anything you like with those eyes ? John  |
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Post by richardthescooter3 on Jul 22, 2012 15:35:28 GMT -6
JR, did what you said, got liquid tape (it works) and electrical tape, it did the job  Just finished and my scoot back on the road again thanks  John I'll check those intakes out thanks |
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Post by JR on Jul 22, 2012 17:54:30 GMT -6
Richard I spent several hours looking for the dual linhai intake and I've not had any luck. There was a company making them and I've not run across them...........yet!
A T can be used and also one can add a port easily themselves, I have on my GY-6 150. I like the seperation and isolating the fuel pump, it makes a difference IMO.
JR
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Post by tvnacman on Jul 22, 2012 18:47:11 GMT -6
so go with larger diameter hose , good vacuume and all will be fine .
John
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Post by cruiser on Jul 22, 2012 19:23:30 GMT -6
Richard I spent several hours looking for the dual linhai intake and I've not had any luck. There was a company making them and I've not run across them...........yet! A T can be used and also one can add a port easily themselves, I have on my GY-6 150. I like the seperation and isolating the fuel pump, it makes a difference IMO. JR Have to agree with JR. I spent some hours looking also with no luck.  |
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Post by JR on Jul 22, 2012 19:31:13 GMT -6
OK John as a AC man and one that knows air flow and duct work look at this picture of the linhai intake and tell me that the vacuum will be as good from one port off of the side or if it will better from the port on the top that is positioned in the "proper" position for vacuum flow that comes when the valves open and close?  As you well know also nothing flows on a T as well as being in line with the vacuum pull of the airstream, in fact instead of saying use a T one should recommend a "Y" connector. People have complained and whinnied about fuel starvation on scooters with vacuum pumps, they are not even vacuum pumps but rather pulse pumps. The stronger the vacuum (pulse) the more steady the fuel flow. Now again will the fuel pump put on the top port that is pulling vacuum in a perfect unrestricted flow position do better on this one port alone and the other items that need very little vacuum to function be better off on the side port? I have a 07 250B that still has the OEM fuel pump on it with the fuel pump isolated alone on this top port that says yes.  This is a picture of the intake off of the 07 when new. See the brass port sticking inside the manifold? Does that interfere withe venturi effect of the carb? You bet it does! Now here is a picture of the ID of the manifold and do remember it is on a 30mm carb;   Now look at it cleaned up with these:  Also the poor brass port drilled out for more flow;  The manifold intake is now 30mm just like the carb. Here's another problem with some scooters especially the ones with the plastic or even thick spacer between the carb and engine port;  See where the manifold bolted up to the spacer? The spacer is also less than 30mm and puts a lip in the direct way of the air/fuel flow. In the picture above where I drilled out the port you'll see this spacer bolted up to the manifold. As I cleaned out the manifold to 30mm I matched the spacer to the manifold for a smooth perfect flow, not interference and better performance. JR |
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Post by richardthescooter3 on Jul 22, 2012 19:38:33 GMT -6
I'm good for awhile, but maybe its time to elimanate the vapor canister  and the extra vacuum lines. what do you think? |
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Post by JR on Jul 22, 2012 19:45:02 GMT -6
Nope they do nothing to hurt performance unless they are leaking. Good hoses, good clamps and it performs it's job like it is supposed to do. Intefering with the scooter running or performance is a myth.
JR
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Post by tvnacman on Jul 22, 2012 19:48:25 GMT -6
Yes JR , your correct in all stated above . I'm sure under the circumstance that the exact replacement part can not be found at the moment . A Y would be better than a T , I belive you would get by with either . Yes any hi or bumps in the surface area of air flow will have an effect . My question to you is 30mm carb, was the intake made the way it is for a reason . I know polishing and porting will aid in air flow/movement .
John
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Post by JR on Jul 22, 2012 20:11:56 GMT -6
No John the problem with the manifold intakes like a lot of things made like this is they are made in a mold and very roughly poured and are very rough and not air flow friendly.
I learned this trick form the guys who race. Even though I don't race things like polishing and making the manifold fit like it should can just add a little more to the engines HP and add power. How much, only way to know is to set it up on the proper machine to measure it but people have done just that.
My thought was beter air/fuel flow, better vacuum, better running scooter and it was just time that was involved and for sure it didn't hurt the performance.
JR
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Post by alleyoop on Jul 22, 2012 20:57:57 GMT -6
Yea, I also looked for a manifold for the 250 with two vacuum connectors and the only ones I found were for the 150s and 50s.
Alleyoop
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Post by JR on Jul 22, 2012 21:17:30 GMT -6
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.partsforchinesescooters.com/2/Intake_Manifold_172mm_Linhai_250cc_Engine-1914.html
..BAD TO THE BONE..
