My DH Ported Head (PICS)!
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From: Zulu Alpha Tango Foxtrot
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Originally posted by gearbox
So what would happen if I just slap everything in there? Will the air bounce off the gasket or something? I didn't think DH was making the actual holes bigger, just the inside. So now what?
So what would happen if I just slap everything in there? Will the air bounce off the gasket or something? I didn't think DH was making the actual holes bigger, just the inside. So now what?
As far as a problem - its not going to do much for the airflow. If you got the proper header it would flow better, but it should not flow worse than stock. The only thing I would be worried about are leaks. The exhaust gasket is designed to prevent leaks - if the head holes are too large there is a good chance it will leak....
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From: NV
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Well I told them it's for an NA setup. So what should I do so it doesn't leak? Have the shop trim the gasket to match? And then the holes for the header will be smaller anyway.
Your best bet would take it to a pro and see what he says. Ershal and opto maybe right but they are only guessing possibilities because they cant see the actual work. They may be right or they may be wrong so dont get too upset about anything..... just take it to a pro and see what he says before jumping the gun.
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From: Virginia Beach, VA
Rep Power: 0 Originally posted by HustleLikeM0FO
Your best bet would take it to a pro and see what he says. Ershal and opto maybe right but they are only guessing possibilities because they cant see the actual work. They may be right or they may be wrong so dont get too upset about anything..... just take it to a pro and see what he says before jumping the gun.
Your best bet would take it to a pro and see what he says. Ershal and opto maybe right but they are only guessing possibilities because they cant see the actual work. They may be right or they may be wrong so dont get too upset about anything..... just take it to a pro and see what he says before jumping the gun.
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From: Zulu Alpha Tango Foxtrot
Rep Power: 311 Actually - just found some good info that you might be interested in. According to the smart folks on the web - the setup you are planning to use may induce what's called "exhaust gas reversion." What this means:
Taken from http://importdesigns.com/index.cfm?f...h_article_id=5
In other words - your best bet is to get some headers that are LARGER than the ports on the head (or as close to them as you can get)....
Reversion: (Noun) An exhaust gas behavioral phenomenon that occurs in conditions where localized exhaust back-pressure is equal to or higher than the pressure exerted by the closing piston during the exhaust stroke. During exhaust gas reversion, exhaust gases sneak back into the combustion chamber during valve overlap (the short period in which both intake and exhaust valves are open). This results in elevated in-cylinder temperatures and a dramatic reduction in an engine’s volumetric
In other words - your best bet is to get some headers that are LARGER than the ports on the head (or as close to them as you can get)....
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From: Zulu Alpha Tango Foxtrot
Rep Power: 311 Take a caliper and measure each one and see how much bigger they are.....
Talk to the shop that you plan on having do this (didn't you say it was a custom shop?) - they may know more about this. It may not be as big of an effect on such a small engine - but regardless you might see a performance decrease do the reversion effect...
Talk to the shop that you plan on having do this (didn't you say it was a custom shop?) - they may know more about this. It may not be as big of an effect on such a small engine - but regardless you might see a performance decrease do the reversion effect...
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From: NV
Rep Power: 811 Thanks I'll see what they say. I'm so fed up with DH right now, and I can't just take a loss seeing I've spent $1000 or more on the head and parts. I really hope it works out.
I wonder what Catalyst is doing with his pnp? Are the SF turbo ports on the header larger than the head ports.
I wonder what Catalyst is doing with his pnp? Are the SF turbo ports on the header larger than the head ports.
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From: Niagara Falls, Ont
Rep Power: 0 gearbox, have you done a stock baseline on the dyno with your car to see exactly what the difference will be? i looked through the 17 pages this thread is and didnt see what your base run was is you have one.
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From: NV
Rep Power: 811 Well, I don't have the money or time to get a baseline dyno. Stock EX makes between 100-110whp. I know every car is different. Nearest dyno for me is 3 hrs away, and I work every day. So it's gonna be fun trying to get a day off work so I can spend all day in Chicago getting it tuned. I doubt it'll be any time soon.
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From: Niagara Falls, Ont
Rep Power: 0 yea i know its a pain to do that, in fact i dont know any place off hand that has a dyno in the niagara falls area but then again i havn't looked into that too much. It would be nice to know tho if as a hypothetical situation you started at 100whp and gained 20 or if you started at 110 and gained 10.... but i guess u already invested enough into this and your final whp is what really counts
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From: NV
Rep Power: 811 Okay, new update. Civicstreetrcr has offered to help me out on the head install on May 28.
So I have until then to buy a dremmel and port match the gasket. Now the good news is the header ports are only about 1.5 mm smaller in diamater than the head ports, so I'll only have to shave off about .75mm all around. The gasket ports are amazingly small, so those will need alot more work. Wish me luck.
So I have until then to buy a dremmel and port match the gasket. Now the good news is the header ports are only about 1.5 mm smaller in diamater than the head ports, so I'll only have to shave off about .75mm all around. The gasket ports are amazingly small, so those will need alot more work. Wish me luck.
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From: NV
Rep Power: 811 I don't know what happened. My appointment was like 3 weeks ago and they kept making excuses. I've been calling a few times a day, but the guy never answers or returns calls. So I just stopped calling.
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From: Chicago Burbs, Other, ZEBRA
Rep Power: 527 HP Header holes are larger than stock header holes. I have pics of it in my DIY. See sig.
I don't know if that's old info or not. Sorry, I haven't been following this thread. gearbox, good luck with your parts, man. Did you install the header yet? Did you ever get that one bolt off?
I don't know if that's old info or not. Sorry, I haven't been following this thread. gearbox, good luck with your parts, man. Did you install the header yet? Did you ever get that one bolt off?
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From: Mt prospect, Illinois, US
Rep Power: 0 urbabna huh i mean its still a drive and a half but theres a shop in mundelin that has a dyno , Ultimate drivers just incase thats closer to ya , i totally forget how long the drive is to my house ...
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From: NV
Rep Power: 811 Header ports are bigger, and I still have NOT gotten the bolts off. I'm hoping the guy installing for me will be able to. Is there a way to break them off, because I have new bolts.
So what is a good place to tune my vafcII that's nearby?
So what is a good place to tune my vafcII that's nearby?
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From: Mt prospect, Illinois, US
Rep Power: 0 well if your up here near like woodfield or arlington race track , you can go to one 6 motor sports, or team noble racing, or ultimate drivers, they have a dyno ...
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From: NV
Rep Power: 811 Civicstreetrcr I believe has all that stuff. He just installed a DH head recently. I just need to get a dremmel and work on the header ports and gasket. Hope I don't mess up.
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From: NV
Rep Power: 811 This is seriously gonna take forever. I did one port on the gasket in an hour. And now it's starting to bend into weird shapes. It's taking forever to grind down and make sure it's smooth. I'm taking pics as I go, but it's getting late and I'm gonna have to quit soon. This thing is really loud.
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From: NV
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From: Chicago Burbs, Other, ZEBRA
Rep Power: 527 Oh man all those pics are red x's.
gearbox, is this something that you could get a shop to do for you? I'm not saying you can't do it, I'm just saying that they have experience.
Did you practice on some extra piece first? Just so you can get a feel for how it works?
gearbox, is this something that you could get a shop to do for you? I'm not saying you can't do it, I'm just saying that they have experience.
Did you practice on some extra piece first? Just so you can get a feel for how it works?
