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By easyissy - 15 Years Ago
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After installing my dual quad set-up I noticed that one of my dual exhaust pipes had more pressure than the other. Could this be a problem?
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By Hoosier Hurricane - 15 Years Ago
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Do you have a heat riser valve on one side? How do you know there is more pressure on one side, did you measure it with a gauge?
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By easyissy - 15 Years Ago
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I just noticed it when I went around to the back of the car. I put my hand behind both pipes and noticed one was considerbly stronger than the other.
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By Ol'ford nut - 15 Years Ago
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Check your heat riser up front where the exhaust pipe hooks to the exhaust manifold. It could be stuck closed or partly closed causing exhaust to go through the intake manifold to the other side. Even try revving up the motor and see if it changes the pressure.
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By easyissy - 15 Years Ago
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So with dual exhaust should I have (2) control valves (1) at the end of each manifold??? Are these mandatory?? Can I just remove them???
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By speedpro56 - 15 Years Ago
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I just remove it from the passenger side which should be the only one you have. You may have to add a similer spacer without the center flap back in it's place so the exhaust pipe will remain in the same position.
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By easyissy - 15 Years Ago
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That makes sense because the passenger side is the weaker side of the two.
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By paul2748 - 15 Years Ago
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The spacers are offered by the parts houses.
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By oldcarmark - 15 Years Ago
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If you are going for a master Macs should have the spacer and you need 2 gaskets.
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By Pete 55Tbird - 15 Years Ago
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To test the back pressure you might consider something we use to do a very long time ago. Take two raw potatoes and stuff them into the exhaust pipes when the car is parked. When the owner started the car the exhaust built up in the pipes and finally BLEW out wih a lot of smoke and noise. Then measure the distance the potatoes travelled and you can compare the pressures. Just a thought for what it is worth.
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By rick55 - 15 Years Ago
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Following on from Pete's method, if you place a julienne blade behind the exhUst pipe when the potato shoots out the back you've got ready made French fries. How cool is that?
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By 55vickey - 15 Years Ago
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Maybe someone can help with the name here, back in the early sixty's there was a book or an insert in a mag about a young boy and an old mechanic and one of the things I remember about it was him taking the kids chewing gum, two small strips of paper and sticking it on the tailpipe. He'd start the car and be able to tell if there was a miss, which bank and any pressure differential, just gotta think, ouch, Gary
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By 'GB'ird - 15 Years Ago
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A couple of balloons over the ends may work. Or even another rubber product Richard
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By easyissy - 15 Years Ago
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Thanks guys for all the suggestions but I'm not planning on making any french fries anytime soon.  I think the heat riser spacer is the answer. Thanks again. One question though, in the Mac's catalog it says that spacer is for a Ford 332 & 352 V8 only. Would this spacer work on my 292???http://macsautoparts.com/campaign_product.asp?camid=F50&pn=JS0R3CHL1106572
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By Hoosier Hurricane - 15 Years Ago
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Those engines could have a bigger pipe, so a bigger flange. Do they list gaskets separately for those engines. If that gaskets are the same as Y, they should fit.
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By 55vickey - 15 Years Ago
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I cut the baffle plate out of mine, then welded the ends shut, works great, Gary
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By easyissy - 15 Years Ago
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Well they do list the gasket for a 292 & 332. It's kinda funny they have three gaskets listed but they all have the same part number. http://macsautoparts.com/search.asp?t=ss&ss=Exhaust+gasket&c=400&year=1958&make=Ford
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By oldcarmark - 15 Years Ago
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I just had a look at Macs catalogue.They are not showing that spacer for the Y-blocks for some reason.They have gaskets.Before you order one you should contact them for clarification..I got mine from Tee-Bird.com who are also great people to deal with.They specialize in 55-57 Fords but no listings for 58.The master listed by Macs is not the same as 55-56 part #.
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By easyissy - 15 Years Ago
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Thanks for the heads up. I'm gonna try Larry's T-Bird & Mustang. I can drive up there, so I'll save on shipping. I'll verify they have it prior to driving up there. Just to make sure. I gotta pick up a master cylinder as well. http://www.larrystbird.com/B__9427AS.html?session=tabnn7Iq http://www.larrystbird.com/B__2140A.html
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By rick55 - 15 Years Ago
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Maybe someone can help with the name here, back in the early sixty's there was a book or an insert in a mag about a young boy and an old mechanic and one of the things I remember about it was him taking the kids chewing gum, two small strips of paper and sticking it on the tailpipe. He'd start the car and be able to tell if there was a miss, which bank and any pressure differential, just gotta think, ouch, Gary
Gary's thoughts are spot on. Way back when, in another life, that is how we all used to check the cylinders on motor bikes, works great on twin cylinder with separate exhaust. You can really hear the difference in the exhaust if they are unbalanced. We never used chewing gum though - bit hard to get off a hot pipe.
Regards
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By aussiebill - 15 Years Ago
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rick55 (10/6/2010)
Maybe someone can help with the name here, back in the early sixty's there was a book or an insert in a mag about a young boy and an old mechanic and one of the things I remember about it was him taking the kids chewing gum, two small strips of paper and sticking it on the tailpipe. He'd start the car and be able to tell if there was a miss, which bank and any pressure differential, just gotta think, ouch, Gary
Gary's thoughts are spot on. Way back when, in another life, that is how we all used to check the cylinders on motor bikes, works great on twin cylinder with separate exhaust. You can really hear the difference in the exhaust if they are unbalanced. We never used chewing gum though - bit hard to get off a hot pipe. Regards Rick, you have to take it out of your mouth before doing it!
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By rick55 - 15 Years Ago
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Bill, I hope that is the gum you are talking about. I have a habit of putting my foot in my mouth.
Good to hear from you. The guy with the ranchwagon found the bearings here in Mandurah easy to get. Seems the Dana diff is a lot easier to get bits for than a Ford sedan of the same era.
Regards
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By oldcarmark - 15 Years Ago
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That spacer from Larrys does not look like the one for a Y-Block.Looks the same as Macs.Look up one for a 56 not 58.Its flat on both sides like the stock heat riser.Looks like the 332-352 spacer.
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By GREENBIRD56 - 15 Years Ago
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Try Concours Parts and look for a '57 T-bird heat riser spacer.....it fits on the "EDB" iron manifold I'm running on the RH bank of my 312. http://www.parts123.com/parts123/yb.dll?parta~dyndetail~Z5Z5Z50000051c~Z5Z5Z598982~P19.95~~~~S31Q01B8P920720013880e~Z5Z5Z5~Z5Z5Z50000051c Its an empty cast iron housing - unfinished - probably used to make a heat riser.
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By oldcarmark - 15 Years Ago
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Thats the right one Steve!You need 2 gaskets the same if only doing one side but I would buy 3 and do both sides.
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By Tom Compton - 15 Years Ago
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CAREFUL. I've seen the potato bomb blow out mufflers instead of the potato.
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