ZROSSA Posted December 4, 2002 Share Posted December 4, 2002 I just receive a copy of Smokey Yunick's Power Secrets. The 2nd to last paragraph in exhuasts says: "Another effective way to decrease the presure in the exhuast system is to collect all eight of the primaries into one secondary pipe. This type of system will develope a negative in the secondary pipe every 90 crankshaft degrees, and produce a stronger overall pressure drop in the system." Am i reading this right? Are we talking a 8 into one equal lenght system? What would the collecters be like? BTW, smokey says that there is no benefit in running a flat plane crank. Interesting reading so far. Douglas Quote Link to comment Share on other sites More sharing options...
Mike C Posted December 4, 2002 Share Posted December 4, 2002 Interesting. Haven't read Smokey in ten years I bet. Sounds like he's saying you are better off running a single exhaust? That in itself is a subject worth pursuing. (4 into one + 4 into one with a Flowmaster y pipe kind of + 8 into 1, at least eventually!) I think the advantage to the flate plane crank is that it was stronger when they used twisted forgings. Now that non-twist forgings are common, that is gone. Quote Link to comment Share on other sites More sharing options...
pparaska Posted December 4, 2002 Share Posted December 4, 2002 You ever seen a V8 with 8 equal length primary tubes of reasonable length brought together into a common Collector? It's a bag of snakes that sit behind the engine and above teh tranny. Great if it's a mid engined car, etc. but not in a V8Z! I can't remember where I saw a picture of that, but it was very interesting and intimidating. Quote Link to comment Share on other sites More sharing options...
johnc Posted December 4, 2002 Share Posted December 4, 2002 If you're willing to give up the passenger seat and build a dog house over that area its very easy to build an 8 into 1 header/exhaust system. TransAm cars have ben running this system for at least 10 years. The real trick on a Z will be routing the 5" diameter exhaust pipe out the back... Quote Link to comment Share on other sites More sharing options...
ZROSSA Posted December 4, 2002 Author Share Posted December 4, 2002 When I was pondering the idea of 180 degree headers I was planing to run them under the oilpan between the x-member and the hump on the pan. It looks like it will fit but I cant say that i have measured it. 8 into 1 could be done the same way. I heard one of these on a old f5000 car years ago. Wicked sound. Never heard any thing like it since. It seemed to have one collecter only. I never was close enough to it to see how it was done. Douglas Quote Link to comment Share on other sites More sharing options...
Len Posted December 6, 2002 Share Posted December 6, 2002 Hey Doug If you got the time and gozongas then go for it! I'll have that bottle of Pinot noir waiting when you get it done . Len Quote Link to comment Share on other sites More sharing options...
ZROSSA Posted December 6, 2002 Author Share Posted December 6, 2002 What? No game hens? Buy the time I get this one finished I will be making my own pinot noir. We are planting 30 acres of grapes next spring. It doesnt leave a lot of time for playing with cars and unfortunatly ZROSSA is second in line behind the race car. Hopefully I will get a bit of time around X-mas to play with the toys. Cheers Douglas Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted December 7, 2002 Share Posted December 7, 2002 not another gone loco modification to dream about.No counting lambs at nite I will be counting 16 big tubes over and over again. ZZZZZZZZZ... 6-7-8.. ZZZZZZZZ... 3-4-5... where does it all go...$$$$$$$$$ Quote Link to comment Share on other sites More sharing options...
RMZ8 Posted December 14, 2002 Share Posted December 14, 2002 This is probably old news to you guys but have you checked out- drgas.com-I'm running his x-syncronizing pipe on my small block zz4 and I love it -quieter more mid range tork and a exotic sound -just an idea! Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted January 25, 2003 Share Posted January 25, 2003 you can get almost exactly the same net effect by running both header collectors(especially of this type ( http://vsholley.vwh.net/HiOctn/ProdLine/Products/ES/ESHHA/SplitFlow.html ) into an (Y) pipe like this http://www.racerpartswholesale.com/flomstr1e.htm and still fit the exhaust under the car Quote Link to comment Share on other sites More sharing options...
Mudge Posted January 25, 2003 Share Posted January 25, 2003 This is probably something for salt flat racers, I do know that they often run a single 4-5" exaust, probably mainly for aero, but if they are building it like the above... Quote Link to comment Share on other sites More sharing options...
johnc Posted January 25, 2003 Share Posted January 25, 2003 8 into 2 into 1 works very well if the primary, secondary, and exhaust tubing sizes are correct. Most vehicles have space problems running a 3.5" or larger mandrel bent exhaust from the "Y" Grumpy posted above. Again, TransAm, Grand Am AGT, and lots of Late Model circle track cars run a large single exhaust when given the chance. Quote Link to comment Share on other sites More sharing options...
Mudge Posted January 26, 2003 Share Posted January 26, 2003 Exaust tubing sizes/primary lengths and all that jazz are going to depend on power and RPM too, so its definately purpose built if you are expecting to get the most gains from it. Quote Link to comment Share on other sites More sharing options...
ZROSSA Posted January 28, 2003 Author Share Posted January 28, 2003 Grumppy, Ross, Fellas, Those collecters look like the would get you a similar responce as a tri-y header. I like the idea of a big single. The car already has block huggers into a y pipe and a 3.5 inch single made buy the previous owner. It needs to be done again. I dont want the car to have the normal v8 sound. I love the sound they make with an more equal fireing order. I would be happy to go to the extra effort as long as there is a power gain as well. I wonder if there will be a difference in power at the rpm I will be running (< 7000 rpm). I look at the local v8 race cars here and the road racing classes all run duels into a cross over and duels out. Even most of the local trans am run this. Im I barking up the wrong tree here for a road car? This is not a daily driver but i would like to do the odd long trip in it. I have to redo the exhuast anyway so I really want to get as much power I can from it. Douglas Quote Link to comment Share on other sites More sharing options...
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