Header Instalation
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Intermediate
Joined: Jul 2005
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Header Instalation
Hi,
I've started to installed a pair of long tube headers on my '85 and I noticed the driver side pushing up against what I belive to be the coolant supply line to the oil filter housing. Is there something I can do about this? Is there a relocater kit any where that will fix this? thanks
I've started to installed a pair of long tube headers on my '85 and I noticed the driver side pushing up against what I belive to be the coolant supply line to the oil filter housing. Is there something I can do about this? Is there a relocater kit any where that will fix this? thanks
Race Director
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From: Merritt Ils Fl
I just did an 85 and had no problems with the oil cooler. I assume you mean the hose that comes out of the block and into the cooler. If correct, can you shorten the hose to provide clerance? I don't recall any type of relocation kit.
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The pipe presses the hose against the fitting on the oil cooler at an angle that restricts the inside diamiater of the hose and the passenger side interferes with the starter wires. I'm thinking about just getting block huggers and not worring about it. I'm using flowtech headers btw. And what does anyone think about using baffle plates on a system w/ a hollowed cat with only resionator tips, to increase back pressure? How do I know when I have too much? thanks
Last edited by skyler_lloyd; Aug 14, 2005 at 02:28 PM.
Drifting
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From: GA
Originally Posted by skyler_lloyd
How do I know whem I have too much? thanks
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Well, when I had a completely free flowing-no resistance exhaust, I lost acceleration and had a hell of a long start up time and the car stumbled a low idle. I made a cres. plate with large holes drilled in it and put it between the front Y-pipe and the converter. This quieted it to a reasonable level, made start up a lot quicker and made a noticable difference in acceleration (faster).
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For those of you who asked me, I used a .080 stainless (cres) plate make from the template of the flange on the converter and evenly drilled several 3/8, 1/2, and one 3/4 hole in the center of the plate, covering almost the entire flow path but leaving plenty of metal to hold it together. I'd post a picture if I could find out how.
Last edited by skyler_lloyd; Aug 16, 2005 at 07:33 PM.
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Team Owner
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From: On a Wisconsin Death Trip
Originally Posted by Morley
Any backpressure is too much. You don't want backpressure, you want the exhaust gasses to keep their velocity. This is how the cylinders get scavenged.
Exhaust gas pulses do the scavenging of the combustion chamber. How fast or slow those pulses travel through the exhaust system determine the scavenging. Not enough backpressure and the pulse might not be timed right to match the engine and it won't scavenge effectively.
Drifting
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From: Oceansaide CA
No he was right. backpressure is bad under any scenario. The reason you want *properly* sized primaries is to keep the gasses from expanding and losing energy resulting in a lower velocity. Iedal gas law baby Pv=nRT 
Hotter gasses are less dense and flow faster. And vice versa. The restrictor plate thing is probably nothing more then a way to band-aid your newly needed tune or you went waaaay too big on your primaries and collectors imo.
Hotter gasses are less dense and flow faster. And vice versa. The restrictor plate thing is probably nothing more then a way to band-aid your newly needed tune or you went waaaay too big on your primaries and collectors imo.
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From: On a Wisconsin Death Trip
Originally Posted by ClarenceT
The restrictor plate thing is probably nothing more then a way to band-aid your newly needed tune or you went waaaay too big on your primaries and collectors imo.
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http://www.partsamerica.com/ProductG...rname=Flowtech
Here's the list of applications '84-'89 corvette included.
I used the plate to comp. for a hollow cat. with stock manifolds. I'll try what LD85 suggested when I change the oil again. As for the headers, I'm not sure if I'm gonna mess with them anytime soon, as I've been really busy lately. So sorry, no updates.
Here's the list of applications '84-'89 corvette included.
I used the plate to comp. for a hollow cat. with stock manifolds. I'll try what LD85 suggested when I change the oil again. As for the headers, I'm not sure if I'm gonna mess with them anytime soon, as I've been really busy lately. So sorry, no updates.
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Originally Posted by loiq
Not true.
Exhaust gas pulses do the scavenging of the combustion chamber. How fast or slow those pulses travel through the exhaust system determine the scavenging. Not enough backpressure and the pulse might not be timed right to match the engine and it won't scavenge effectively.
Exhaust gas pulses do the scavenging of the combustion chamber. How fast or slow those pulses travel through the exhaust system determine the scavenging. Not enough backpressure and the pulse might not be timed right to match the engine and it won't scavenge effectively.
The tuning effect in a SBC exhaust system is pretty much nonexistent IMO, the cylinders are not firing in an even order, pressure in the collector is all over the place because of this, and most long tube headers aren't even equal length anyways.
