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| To EGR or not, that is the question..... https://www.slantsix.org/forum/viewtopic.php?t=9223 |
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| Author: | steponmebbbboom [ Tue May 04, 2004 6:16 pm ] |
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You know what, once you get your 2bbl on there and set it up you may find you can advance it as far as you need to without pinging. Whole different carburetion system. I would guess your old one is running lean. You may not need the EGR at all to lower chamber temp. If the mixture's more enriched the temperature will go down. |
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| Author: | 64 Convert [ Tue May 04, 2004 7:38 pm ] |
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Quote: In order to try it both ways, you'll need to set up the whole EGR system. It's a lot more than just a valve and a vacuum hose! You'll need the EGR vacuum amplifier, CCEGR switch/valve and, if you are trying to have the least-primitive EGR system possible, the inhibit switch that prevents EGR in 1st and 2nd gear.
I know I need the vacuum amplifier, but I thought the switch only came into play for cold weather driving. I'm not familiar with the inhibit switch, and I don't think it's on the Aspen setup...at least I can't find it.One problem I do have is I already discarded the old EGR valve and according to NAPA, the Echlin catalog shows 6 different part numbers for the 225. The number needed depends on the OEM part number, so I might be screwed without knowing that number. |
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| Author: | Matt Cramer [ Tue May 04, 2004 7:52 pm ] |
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One thing that's worth noting is that an EGR setup will normally close the valve completely at wide open throttle anyway. If the system is working correctly, it should not affect performance either way. (This does not apply to some of the early full-time systems that used a metering orifice instead of a valve, then again, that's not a system that can ever be said to be working correctly.) |
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| Author: | SlantSixDan [ Tue May 04, 2004 8:51 pm ] |
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Depends on your definition of "performance". Most of us don't spend much time at WOT so "performance" means on-road driveability at various degrees of part throttle. |
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| Author: | kesteb [ Fri May 07, 2004 8:22 am ] |
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Quote: I realize EGR wouldn't offer a direct performance increase, but it should allow more spark advance. Right now, I can only get about 2* advance before it begins pinging on 87 octane.
Not all of the \6 distributors are the same internally. The old adage of bumping the distributor to 10* BTDC may not work for you. I recently took my distributor apart. It was from a '78 Aspen with the SuperSix package. I could never advance the initial timing more then 4* BTDC with out pinging. The reason was the the distributor was designed to have 26* of total advance. The vaccum pod had 22* of advance. The stock \6 can only handle about 30* total static advance. I'm not concerned about WOT conditions, since I seldom do that, but what about a torque increase at half throttle with another 3*-4* of advance available? Following previous messages from Slant Ceciel and DusterIdiot and doing some spare parts engineering, I built a distributor to only have 18* total advance. With 12* BTDC inital, I have 30* total static. The vaccum pod was also changed to give 11* of advance. I still have pinging if I push the car too hard. Some additional fiddling is still obviously reqired. Did I get amasing amounts of power and torque. No, not really, but the car now runs down the road much easier. |
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