Alright, I have a pretty much stock 91 ls besides exhaust and cai. I also have a port matched intake manifold off a 93. i was wonderin if it would be worth it to just use this manifold or if i should just buy an aftermarket one. I also have a port matched ls head that i was thinkin of building if any1 has any suggestions. thanx
Port matching is specific to each component and what it’s matched to. No?
I got my intake manifold port matched to my head after I got my head ported.
I got my header port matched to the exhaust ports after the head was ported.
I got my throttle body port matched to my AEBS manifold because it had a bigger bore than by throttle body.
Why am I skuntfused about your questions?
Can anyone shed some light as to what Port Matching is?
port matching is when they would take the intake manifold, throttle body, etc. and make the ports on the head match the ports on the intake manifold… they basicly bore it…
DB2-lol! thats funny. the im is port matched to the gasket, buddy. anyway, if u have a stock motor…an aftermarket im will hinder performance. plain and simple. u’ll need bigger cams, higher c.r. and better overall airflow to benefit from an upgraded im with a larger plenum.
Nas-I’m not sure if you are laughing with me… or at me.
When I got my head ported had the intake manifold ( AEBS ) flow tested and ported as well…then they used the Hondata IM gasket as a template… and on my head… removed some material from the intake ports on the head to match the intake manifold.
Was this incorrect? Did I get riped off?
nah, i was just biggin’. but, i don’t like the fact that ur machinist removed material from the intake ports on the head. they are large already. more attention is needed on the exhaust side (in terms of volume) but even then, its very small. the intake gasket and intake manifold port should match. its the runner port at the flange that needs enlarging. real people know where power is obtained through head porting. and, on 1.6-1.8L vtec heads, increasing port size is not really necessary. the secret lies a certain height above and below the valve seat. :run:
i’ve run it all, from stock 90-93, stock 94-01, and skunk 2 manifolds. for the price the 94-01 Intake manifold and throttle body are awsome. the manifold isn’t too far off from the skunk 2 one and it is a hell of alot cheaper. the tb is 2mm bigger than your stock g2 one and you can use the tb mounted map.
Nas, the head was ported by a old gentleman from Argentina, who’s been racing motorcycles for the past 25 years. He’s been porting and flowbenching for years and even admitted that the head will require a lot of time ($800.00 including the AEBS) because it’s already pretty much as efficient as it is. I didn’t actually see the work being done to my head… but I did see another customer’s b18c1 head getting flow tested.
I even had bowl job done. With the Skunk 2 Stage 2’s, the motor made power to 8900 with out messing with the cam gears. The head held up to 3 bottom end rebuilds and 40,000 of 9500 pulls over a 5 year period.
I understand that we can discuss this topic of porting for days on end.
I already know all about porting n polishing. I went to wyotech and did the work my self. i was wonderin if the port matched (gasket matched) im would be better than spending money on an aftermarket one. Or if i should go to a junk yard n grab a im off a vtech motor and then port match it to my head.
i thought the whole port n’ polishing idea was to take parts off the actuall head itself, not just the gasket.
:lol: When u port n polish you use the gasket (intake and exhaust) as a templet so you know exactly how much your goin to port it. Then you can go and polish up the chambers
thats port matching you are thinking of when you are porting the runners to the shape of the gasket. it normally goes hand in hand with the port and polish.
:iagree:
:werd: What do you think the porting part of “porting” & polishing is? You open up the runners to the gasket or im runner size then you polish it , but not too much be cause u dont want it too smooth because the fuel wont atomize as well as it would with a slightly rough cyclone polish. I know what im talkin bout when it comes to this shit , but i wanna know if it’ll be better to just use this im (it came off a 93 auto) but i wanted to know if i should use this im or jus spend sum cash on an after market one. because ive noticed the runners on this im seem too be a lil bit longer than the ones on my 91 and the aftermarket one so i just need some advice.:rockon:
A little write up on port matching and mild porting
Originally posted by Jacksont001 on Feb/01/06
Now it’s time to move on to the runners and the Intake ports.
The big problem I was having was that the IM and the head were not aligned correctly. I used the gasket as the template, and the bolt holes to ensure it is aligned right. The mismatch jumps out immediately.
If bolted as-is the ports do not breathe as well as if they were un-ported, but correctly matched.
So the first step is to grind away material on the ports to make them concentric (same center). The intake ports will be opened up to nearly match the gasket. The runner ports will be about 0.5 to 1mm smaller than the intake port, to prevent reversion, so basically almost 1mm away from the gasket marking line.
Starting with the Runners I use an 80 grit sanding drum (the larger ones) and start in the corner. Not only do I work the Dremel around the opening, but back into the runner a few inches (using the flexi-wand) to blend the work back.
It is surprisingly easy to do, but make sure the piece is securely fastened/propped, since a movig hunk of metal is the last thing you want when the Dremel is spinning 5,000 rpm!
Make sure you clean it thoroughly since any metal dust will end up on your piston rings.
The BIG step is doing the port work on the head. The principle is the same as the runners but now you officially “porting” the head. There are a lot of Pictures on the internet forums and websites of headporters, AND discussion AAAAANNNND articles here, so I won’t delve into How to do it, only What I Did.
Blend the port back to the divider. I also started working the divider to put an edge on it and look more like the ones already mentioned.
Remember this is mainly to improve the flow into the head by shifting and aligning the ports, and doing a mild port job. I am not 100% complete with the head.