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Old November 20th, 2011, 08:01 AM   #1
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6spd intake manifold BYPASS VALVE, what does it do

so on 6spd accord v6 there is bypass valve built into intake manifold, as far as i can tell it operates buterfly "flappers" and pretty sure thats what makes extra noise above 5k. what is it for? does it have to do with EGR?
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Old November 20th, 2011, 03:46 PM   #2
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i think its supposed to make a smoother transition into vetec or to equalize the pressure on the front and back banks of the intake manifold
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Old November 20th, 2011, 03:51 PM   #3
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it acts as a dual stage intake manifold. long runners for low end. short runners for top end
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Old November 20th, 2011, 04:07 PM   #4
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why auto v6 dont have it?
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Old November 20th, 2011, 06:07 PM   #5
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idk but i see where it should be lol
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Old November 20th, 2011, 06:18 PM   #6
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I ono but all the gen3 TL has it, and even the gen4 regardless of AT or MT?
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Old November 20th, 2011, 09:03 PM   #7
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I think the intake crossover is at 4300. It is more pronounced than the vtec too. My plenum has been ported in the center where the air flows into and out of that chamber. It helped the flow along with other porting.
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Old November 20th, 2011, 09:55 PM   #8
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^ I am trying to see if the TL-S im is 2 piece. I want to take them apart and port and polish the internals.

@ sy272004 Hey how did your port and polish your runner last time? Did you use air tools or a dremel with tons of sanding bands?
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Old November 20th, 2011, 10:09 PM   #9
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Is the tl-s a direct fit on our cars? The 6mt manifold is only around $100 from Honda so I wonder if the tl-s is around the same price....... Time to go look....


Edit... Yep only 145 but the upper part is 400 and I cant tell if they are the same as ours.
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Old November 20th, 2011, 10:25 PM   #10
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I borrowed this from Kiet build




Those bolts got me wondering. Since most people can only reach the outer ports. how about the inside?
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Old November 20th, 2011, 10:47 PM   #11
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Ohhh, is that the magnesium manifold or is that aluminum?

I cut the sides off the accord manifold i'm working on now. You can polish everything then weld it back up.
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Old November 20th, 2011, 11:06 PM   #12
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Not sure. Show me some pix bro
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Old November 20th, 2011, 11:22 PM   #13
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I got the idea from this guy. Mine is done the same except I am doing more porting to the mouth and around the crossover.

(Scroll down)

http://www.v6performance.net/forums/...ting-pics.html

If you look around the middle, you can see where the material has been removed. I haven't finished with center or any of it for that matter do to no time.



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Old November 20th, 2011, 11:33 PM   #14
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^ damn sir!! TY TY for the link.
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Old November 21st, 2011, 06:32 PM   #15
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Quote:
Originally Posted by thisaznboi88 View Post
^ I am trying to see if the TL-S im is 2 piece. I want to take them apart and port and polish the internals.

@ sy272004 Hey how did your port and polish your runner last time? Did you use air tools or a dremel with tons of sanding bands?
my intake runners were from p2r and i used drill to further port them i guess but i made them smooth instead of leaving them rough. some said it was not good idea
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Old November 21st, 2011, 06:58 PM   #16
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^ it was a great idea. Rough was only needed for older car that used CARBs. The reason being that the air/fuel mixture was mixed in the IM. with Fuel injected its mix right before it hits the head. So smoother was better for everything behind the injectors.
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Old November 21st, 2011, 07:17 PM   #17
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Quote:
Originally Posted by Ilovemyvtx View Post
I think the intake crossover is at 4300. It is more pronounced than the vtec too. My plenum has been ported in the center where the air flows into and out of that chamber. It helped the flow along with other porting.
but vtec crossover is at 3500k. i can hear it but not as loud as whatever happens around 5k
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Old November 21st, 2011, 07:47 PM   #18
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My runner crossover is at 4k. Vtec is at 5k. No way vtec is at 3500. That would be horrible on MPG.
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Old November 22nd, 2011, 05:12 AM   #19
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Quote:
Originally Posted by Ilovemyvtx View Post
Is the tl-s a direct fit on our cars? The 6mt manifold is only around $100 from Honda so I wonder if the tl-s is around the same price....... Time to go look....


Edit... Yep only 145 but the upper part is 400 and I cant tell if they are the same as ours.
By upper part do you mean the top plate? If do ot looks verry similar
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Old November 22nd, 2011, 03:42 PM   #20
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Quote:
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My runner crossover is at 4k. Vtec is at 5k. No way vtec is at 3500. That would be horrible on MPG.
maybe im reading wrong but here. although this was probably for old j30 since it has release date of 2000

Honda Accord -- Drivetrain - Honda.com

Quote:
HIGH-SPEED OPERATION
Between 2300 and 3900 rpm (depending on manifold pressure) in the 4-cylinder engine, and at 3500 rpm in the V-6, the intake valve timing switches to a high-performance mode. The two intake-valve rocker arms are locked to a third rocker arm and cam follower located between them, via an electronically con-trolled, hydraulically actuated locking pin. Until now, this third rocker arm has been independently following the contour of a high-lift, long-duration camlobe. The two intake rocker arms are now actuated by this third rocker arm and a cam timing that more closely matches the intake-tract timing required for optimum torque at high engine speeds. The result is a broader, flatter torque curve, low emissions and smoother power delivery throughout the engine's entire speed range.
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Last edited by sy272004; November 22nd, 2011 at 03:55 PM..
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Old November 22nd, 2011, 03:59 PM   #21
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ITs probably the old one. If you look at some of the dyno graph you see there is a dip at 4000 before the manifold open up and there is a very small dip when vtec comes in. Our vtec is very linear so you won't see large spike like the B and K series.

Last edited by thisaznboi88; November 22nd, 2011 at 04:11 PM..
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Old November 22nd, 2011, 04:31 PM   #22
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probably couse of 3 stage vtec on j30

thats kinda weird since i do feel slight bump in power but it doesnt show on graph
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Old November 22nd, 2011, 05:25 PM   #23
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also remember the older j30 didn't have the dual runners on the manifold.
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Old November 22nd, 2011, 08:27 PM   #24
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Quote:
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ITs probably the old one. If you look at some of the dyno graph you see there is a dip at 4000 before the manifold open up and there is a very small dip when vtec comes in. Our vtec is very linear so you won't see large spike like the B and K series.
Nice find on dyno sheet lol
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Old November 22nd, 2011, 08:29 PM   #25
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^ thank you for posting up the dyno sheet. haha <3 your car
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Old November 22nd, 2011, 08:40 PM   #26
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^ thank you for posting up the dyno sheet. haha <3 your car
I was sittin here like damn me and thisaznboi88 got some similar numbers lol and then I was like wait hold up that's me...I didn't even notice all that on dyno sheet..im gonna be doin a new one very soon, waiting for some good weather and this time I fixed my vacuum leak plus the addition of a jpipe (but gay welding to tsudo) shouldn't affect me too much hopefully
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Old November 22nd, 2011, 09:08 PM   #27
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Here is mine with just the j-pipe. You can see the same dip...

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Old November 22nd, 2011, 09:29 PM   #28
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I love the accord TQ band. Very flat
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Old December 1st, 2011, 11:54 AM   #29
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butterflies dnt do shiz but get in the way, i dynoed tht one also and numbers were identical, my .02 cents
hey jiga nice dyno bro BTW!
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Old December 1st, 2011, 12:10 PM   #30
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^ I don't it shows up cuz you were going WOT.
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