HOW TO DO AN ADVANCED SEARCH.

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For the benefit of 944Hybrids users there are two search functions available for you to use.
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dual 3 inch exhaust?

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dual 3 inch exhaust?

Post  bluehellfire666 on Mon Jul 19, 2010 12:27 pm

I'm looking at building a new exhaust from the headers down since my car seems a bit choked by the non mandrel bent 2 inch stuff going into a single 3. I have access to pretty cheap mandrel 3 inch, actually a buddy gave me 3 90's yesterday for free, so i'm thinking of redoing my exhaust. Question is, will i be able to fit a true dual 3inch setup under the torque tube? If not, do ya'll think oval tubing side by side will fit? I don't want to throw away my current piping, because it's worked very well so far, i'd just like to add to it...sorry if that seems stupid, but i'm doing this on a pretty tight budget, but i think the car will really appreciate a bigger exhaust coupled with some bigger tubing on the intake side (maybe help with my rich condition?)

thanks guys!
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Re: dual 3 inch exhaust?

Post  87-944S on Mon Jul 19, 2010 4:55 pm

Take a look at Tony G's dual exhaust setup on the old board, it's impressive. The mufflers are mounted upright side by side, it all fit.

Well, I went to take a look, and his gallery is gone, the links is his post that show the pics are invalid, but anyway, it can be done.


Last edited by 87-944S on Mon Jul 19, 2010 7:41 pm; edited 1 time in total (Reason for editing : Posts are gone)
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Re: dual 3 inch exhaust?

Post  bluehellfire666 on Mon Jul 19, 2010 8:18 pm

awesome! that's what i wanted to hear, i knew that dual 2.5's would fit, since i've seen that done, but i wasn't sure if anyone had done dual 3's. I remember now seeing tony's setup with the upright mufflers, that was pretty sweet.

thanks for the help!

edit!!!

found pictures on his website [You must be registered and logged in to see this link.]

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Dual 3" exhaust

Post  Max Energy on Mon Jul 19, 2010 8:29 pm

Gentlemen,
I believe that TonyG's exhaust is 2 1/2" not 3". Tony did a great job building a true dual exhaust.
Max
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Re: dual 3 inch exhaust?

Post  bluehellfire666 on Mon Jul 19, 2010 8:46 pm

interesting...looking at the picture there is room on under there for a little bit larger of a system so i guess i'll have to just give it a try huh?

do you guys think it would be necessary and/or beneficial to run an x-pipe or h-pipe with this setup? i'd like to run one but i don't know why exactly it is necessary and i don't know if i'll be able to build one effectively or if i will have to shell out big bucks for a real tight x with 3 inch tubing all around
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Re: dual 3 inch exhaust?

Post  948 on Tue Jul 20, 2010 11:08 am

Though dual 3" back would be cool, it would be over kill. IIRC dual 2-1/2" systems are usually good for 450Hp and dual 3" systems are good to 600hp....
An X-pipe, when put in the right place, will usually improve power a little. Also, the dB level will go down and the exhaust note will become smoother.
Either way I would like to see pictures of your build. Very Happy

BTW, how much HP/Lb-ft are you making?

Also, PM sent
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Re: dual 3 inch exhaust?

Post  Dawgz83948 on Tue Jul 20, 2010 12:19 pm

I love the way my X pipe makes my dual exhaust sound.
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Re: dual 3 inch exhaust?

Post  bluehellfire666 on Tue Jul 20, 2010 1:25 pm

overkill is perfectly okay in my book...if i go bigger now, as i upgrade the engine i won't have to upgrade the exhaust and intake, they'll be ready to handle the big numbers if i stroke it or blow it (or both...hehe)

for power and torque numbers, i have no idea right now...i've never had it dynoed. Hopefully i can get it on the rollers this weekend to get some estimates, but i may end up spending the weekend building this new exhaust...we'll see!
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Re: dual 3 inch exhaust?

Post  Porch on Tue Jul 20, 2010 2:59 pm

Definitely put an X pipe in there, it will increase low-end torque and give the exhaust a more mellow tone.

I have no idea what 2.5" exhaust is good for hp-wise, but it must be at least 600hp. Dual 3" is way overkill. Considering u-bends are about $15-20 each on ebay, if i were going to spend the time, i would just buy 2.5" u-bends.

Even 2.5" dual is overkill, but it's reasonable overkill. 3" duals are for mountain motors.
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Re: dual 3 inch exhaust?

Post  bluehellfire666 on Tue Jul 20, 2010 4:41 pm

point taken...I'm going to go with 3 inch for now since i can reuse the flowmaster i have on there. This way i can have the same sized exhaust from the header to the tailpipe, definitely way overkill for the disp. i'm running, but that may change, so i don't really see dual 3's being a problem...it'll be good to at least get mandrel bends in where i had cut bends before...

i'll update as i build. I got a good deal on a bunch of 3 inch mandrel bent pipe, a buddy gave me some and i found a local custom exhaust place that had a great deal on a 3" builders kit.
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UPDATE

Post  bluehellfire666 on Fri Jul 23, 2010 9:26 am

been working hard the last couple days...got some good work done, take a look!

took my patriot tight tucks, cut off the 2.5 inch collectors and welded further up on the collector where it was closer to 3 inches.

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Re: dual 3 inch exhaust?

Post  948 on Fri Jul 23, 2010 11:14 am

Coming along well....
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Re: dual 3 inch exhaust?

Post  bluehellfire666 on Fri Jul 23, 2010 9:52 pm

thanks a bunch! made some good progress today, no new pics though, they'll be up tomorrow hopefully. I need to pick up some vbands once i get some money back in the bank, for now everything's going to be welded up solid
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Re: dual 3 inch exhaust?

Post  bluehellfire666 on Tue Aug 03, 2010 12:35 pm

it's done!!! muhuhahahahaha!

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what do ya'll think?

btw, any ideas on the smoke coming out the tailpipe? is that just from not having cats installed yet, or am i running WAY rich?
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Re: dual 3 inch exhaust?

Post  944-LT1 on Tue Aug 03, 2010 1:05 pm

btw, any ideas on the smoke coming out the tailpipe? is that just from not having cats installed yet, or am i running WAY rich?

Nope. Blue = Oil
That there, Im sorry to say, means your valve train needs attention. Most likely valve guides are shot. Crying or Very sad

You may want to do a compression test on all eight to see if its a bit of blow-by, but 98% of the time, its the valves.


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Re: dual 3 inch exhaust?

Post  bluehellfire666 on Tue Aug 03, 2010 1:13 pm

eh...i'm not too surprised, i've never gotten blue smoke before building this exhaust, which is intriguing. Would an oil change to a thicker oil help at all? at least as a temporary thing until i get a chance to buy new valve guides and pull the heads to change them?
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Re: dual 3 inch exhaust?

Post  944-LT1 on Tue Aug 03, 2010 11:06 pm

Yeah, it doesnt look too bad yet.....not like Uncle Bucks. Laughing Laughing Laughing

Just wait for winter and get at it. santa

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Re: dual 3 inch exhaust?

Post  modenas on Wed Aug 04, 2010 12:53 am

can i ask what the point of the duals? i mean yea duals are nice but not big, your are hurting your performance more than anything.
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Re: dual 3 inch exhaust?

Post  bluehellfire666 on Wed Aug 04, 2010 11:04 am

preparing for future modifications more than anything...the old exhaust was total trash, so i built the best i could right now, instead of having to rebuild it anytime i do anything to the engine
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Re: dual 3 inch exhaust?

Post  948 on Wed Aug 04, 2010 11:15 am

Sounds good, just like my father in-laws 64 Nova.

I agree with Michael on the blue smoke; it gets thicker when you let off...typical sign of oil getting past the valve guide seals. Thicker oil may make a small diff...
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Re: dual 3 inch exhaust?

Post  bluehellfire666 on Wed Aug 04, 2010 12:24 pm

xschop suggested it may be the way old gas in the tank that's creating some smoke, i can always dream right? we'll see what happens with some good gas and some octane additive and fuel system cleaner
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Re: dual 3 inch exhaust?

Post  944-LT1 on Wed Aug 04, 2010 5:40 pm

I agree with Michael on the blue smoke; it gets thicker when you let off...typical sign of oil getting past the valve guide seals. Thicker oil may make a small diff...

Our 1960 Studebaker (yes im in south bend too) smokes like a SOB just like that and for that reason.

xschop suggested it may be the way old gas in the tank that's creating some smoke, i can always dream right? we'll see what happens with some good gas and some octane additive and fuel system cleaner

Interesting. How old is the gas? The reason why I lean towards valve related is because thats the most common cause for oil getting into the combustion chamber and I noticed you have modified the valve train with those 1.6 RR's. Basically, I wonder if you changed out the springs and if not, maybe one collapsed or got bound up causing valve stem, guide or seal damage???

.....Best to do a compression test right off the bat and see anything jumps out at ya.

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Re: dual 3 inch exhaust?

Post  bluehellfire666 on Wed Aug 04, 2010 11:54 pm

huh, well do you think that would cause a miss at wide open throttle? that's what's making me think it's not necessarily oil leaking past yet, because it bogs and blows smoke if i punch it, but if i rev it slowly it doesn't seem to blow much at all out the tailpipe
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Re: dual 3 inch exhaust?

Post  944-LT1 on Thu Aug 05, 2010 6:30 am

I see what you mean. Hmm....

Is it possible, and no offense-Ive done it before, that you may have added some gasoline from a can just sitting around that may have had a oil mix in it; like lawn-mower gas? This would cause it.

Its very possible to have missing at WOT with a bad intake valve. Valve train tolerances are finicky! For example, back when engines had to have certain valve lash set (i.e. 0.012" for 60's austin healey and 0.0025" Studebaker just as an for instance), if they were too tight/loose, they would spit and sh** all over the pavement. Laughing And trying to tune an engine with valve out-of-adjustment is just impossible. You'd have backfire and afterfire...all sorts of bad stuff.

Regardless, its pretty easy to check if its the gas, valve train or internal or otherwise. Good Luck nonetheless!

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Re: dual 3 inch exhaust?

Post  bluehellfire666 on Thu Aug 05, 2010 11:00 am

well, i know for a fact that i took i think 1/4 turn out of all of the rockers, because i thought i had them too tight...there were other problems that had me believing i had screwed up installing the rockers, so i loosened them just a bit...do you think that could do it? I'll try turning them in 1/8th turn each to see if it changes anything.
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Re: dual 3 inch exhaust?

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