How can I tell if my engine has been ported?
As the title states I'm trying to find out if my engine has been ported and if there is a way to tell without dismantling the engine and inspecting the ports. I know it was rebuilt but do not know if it was just a "stock" rebuild. I took a trip recently to my home town and met up with a friend that has a 91 N/A GXL, mine is a 90 N/A GXL. He has a similar setup to mine, headers, cat delete, to a single side cat back, his is HSK hi-power and mine is Corksport power series. They both have about the same amount of miles since rebuild but mine seems to have more power, and different idle characteristics. I know it's not much to go off of but I figured with the vast knowledge of the forum someone would be able to answer my question or point me in the right direction.
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With the lim off if it was bridged you can feel the extra bridgeport down the intake port on the irons. As for a street port not sure
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How much vacuum does it pull at idle?
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Originally Posted by ben.farnath
(Post 11324980)
With the lim off if it was bridged you can feel the extra bridgeport down the intake port on the irons. As for a street port not sure
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Originally Posted by K-Tune
(Post 11324996)
How much vacuum does it pull at idle?
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if it was a stock port on an engine with good compression, vacuum would be around 17mmhg but ported could be anywhere from 10mmhg to 15mmhg
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Vacuum depends on what RPM its idling at too.
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Originally Posted by CALPICO
(Post 11325044)
if it was a stock port on an engine with good compression, vacuum would be around 17mmhg but ported could be anywhere from 10mmhg to 15mmhg
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Originally Posted by nate91242
(Post 11325055)
Vacuum depends on what RPM its idling at too.
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^ irrelevant until you get a boost/vac gauge
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I'm going to pick up a vacuum pressure tester on Friday and I'll report my findings then. But in the mean time I took a quick video of my car idling. I know it's black but it was dark when I took it.
<iframe width="420" height="315" src="http://www.youtube.com/embed/4i0ohR7aswg?rel=0" frameborder="0" allowfullscreen></iframe> |
Originally Posted by ben.farnath
(Post 11324980)
With the lim off if it was bridged you can feel the extra bridgeport down the intake port on the irons. As for a street port not sure
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Doesn't "sound" ported, but then again street porting isn't supposed to affect idle quality.
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Originally Posted by K-Tune
(Post 11325363)
Doesn't "sound" ported, but then again street porting isn't supposed to affect idle quality.
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just get an after market boost gauge to replace the iffy-at-best electronic stocker
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the best cheap way is to take off the intake manifolds and stick a small mirror that you can bend into the intake port, shine some light in there and look at the port. You can also try and feel the shape of the port with your fingers. If the ports are "sharp", its still a stock port. If you see that the bowl has been smoothed out, its likely that its also ported.
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Originally Posted by OniFC
(Post 11324973)
As the title states I'm trying to find out if my engine has been ported and if there is a way to tell without dismantling the engine and inspecting the ports. I know it was rebuilt but do not know if it was just a "stock" rebuild. I took a trip recently to my home town and met up with a friend that has a 91 N/A GXL, mine is a 90 N/A GXL. He has a similar setup to mine, headers, cat delete, to a single side cat back, his is HSK hi-power and mine is Corksport power series. They both have about the same amount of miles since rebuild but mine seems to have more power, and different idle characteristics. I know it's not much to go off of but I figured with the vast knowledge of the forum someone would be able to answer my question or point me in the right direction.
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Originally Posted by Black Knight RX7 FC3S
(Post 11326064)
the best cheap way is to take off the intake manifolds and stick a small mirror that you can bend into the intake port, shine some light in there and look at the port. You can also try and feel the shape of the port with your fingers. If the ports are "sharp", its still a stock port. If you see that the bowl has been smoothed out, its likely that its also ported.
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Originally Posted by Driftology
(Post 11326141)
sorry I don't have an answer to your question but I am running headers and high flow cat and I was wondering how loud the setup is with the hks exhaust?
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I just got it cleared up by the guy that rebuilt the engine. It is not ported.
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Tell your friend to check his vac lines for leaks and see if there is one, if there isn't compare your air to fuel
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