PONTIAC ZONE TECH FORUMS
 

Go Back   PONTIAC ZONE TECH FORUMS >
Engine Tech
> Low Compression Street Engine's & Tuning Techniques
User Name
Password

Low Compression Street Engine's & Tuning Techniques Idea's...How Too's on low compression Engines.

sponser links

Reply
 
Thread Tools
Old 10-06-14, 09:34PM   #1
Mr.Pontiac
Registered User
 
Join Date: Feb 2003
Location: Weirton WV
Posts: 1,822
Default Help me find set mufflers, anybody??

My 3 inch exhaust is currantly going into my expanded 2.5 muffler offset inlet & outlet.(Don,t like idea) I want to change mufflers to a 3 inch offset inlet & outlet with a overall length of close to 27 inches long. Muffers are welded on
my 3 inch x pipe once cut off im loosing about 4 inches overall. Thats why i need a 27 long muffer.NO GLASSPACKS PLEASE!! Can,t find anything. Some help from anybody????Car is a 67 GTO mostly strip time.
Mr.Pontiac is offline   Reply With Quote
Old 10-07-14, 08:29AM   #2
ta man
Registered User
 
Join Date: Apr 2011
Location: Clinton Ontario
Posts: 217
Default

Don't fret too much about 2.5 inch mufflers..I'm running mid 11's at 118 plus with 3 inch X pipe into Flowmaster cone reducers into 2.5 inch Walker Ultraflows!But if you have three inch tailpipes go with the 3 inch.....
ta man is offline   Reply With Quote
Old 10-07-14, 03:34PM   #3
tjs44
Ram Air V Guru
 
Join Date: Jul 2002
Location: long beach,california
Posts: 1,845
Default

I run Hushpowers on 2 cars,LOVE them!
tjs44 is offline   Reply With Quote
Old 10-07-14, 06:11PM   #4
Mr.Pontiac
Registered User
 
Join Date: Feb 2003
Location: Weirton WV
Posts: 1,822
Default

ok, Ill stick with them,Just thought id pick up a little more flow with better mufflers
Mr.Pontiac is offline   Reply With Quote
Old 10-22-14, 09:14PM   #5
steve
Registered User
 
steve's Avatar
 
Join Date: Jun 2005
Location: Louisa, Va
Posts: 228
Default

How fast is the car? If it runs in the high 10's you might benefit.
steve is online now   Reply With Quote
Old 01-22-15, 11:08PM   #6
Mr.Pontiac
Registered User
 
Join Date: Feb 2003
Location: Weirton WV
Posts: 1,822
Default

I don,t have reducers, I opened up my inlets so 3 inch exhaust would go over pipe. down inside its dead headed meaning its hitting case with exhaust gases.
Mr.Pontiac is offline   Reply With Quote
Old 01-29-15, 01:51AM   #7
sprint250
Moteesuh
 
sprint250's Avatar
 
Join Date: Jul 2002
Location: La Jolla , California
Posts: 3,530
Default

Sounds like you're trying to make do with what you already have to save some coin and just get it down the road .Are the entrance an exit paths now choked to the inside diameter of the smaller 2.5" muffler inlet tube slipping into the 3"? Or did you just hog the case out with a 3" hole saw , stab or butt the 3" into it and weld it in place?
That's a flow restriction/turbulence issue if you are racing through it but no big loss on the street for just puttin' around.
It's a compromise at best.
Remember when piping exhaust that the bell ends of the tubing always face upstream towards the front of the car.You always want to be slipping the discharge end of a tube into a bell(increased size).This minimizes flow restrictions against the direction of flow.
Always cut the tubing with a saw.Cuts made with wheel type cutters deform/crush the tubing in the area of the cut and it needs to be reamed to full inside diameter of the tube before final assembly to minimize adding flow restrictions to the exhaust system

If you can run your car uncorked at the track no big deal.
Just tune your combination for open headers.

I use flanged Y cut outs just after the collectors and bolt some short turn downs on 'em when I get to the track.
I drive a lot on the street so the sound level can be a fatigue issue , for me.
For extended street use choose a muffler that uses a tuned chamber that cancels a lot of the "cack" noise but leaves the power alone.
I use 2.5" Hooker Aerochamber mufflers for the street .They make it quieter and do not appeciably restrict power. Works for me.
They arer available in offset inlet /center out , offset inlet/offset outlet & center in/center out up to 3" tube size if you require it.The inlets for the chambers are sized for the tubing they will be seeing so there is no collision/deadheaded transitions.
They are as long as a standard turbo style muffler so there would be room for X or H pipes and cut outs after the collectors as long as the muffler outlets are placed just ahead of the rear axle to allow for piping up and over it to get it out to the back of the car if that is what you are tring to achieve.

I would not recommend the Hooker "Maximum Flow" mufflers for street use.
They are the same welded style case as the Aerochamber but just run a perforated tube through them and the case is packed with glass wool that disintegrates over a short time making the muffler louder as it ages.Very loud/race type muffler.
__________________
Step Away From The KOOL AID !
sprint250 is offline   Reply With Quote
Old 02-09-15, 03:46PM   #8
Jeffs 64
Registered User
 
Jeffs 64's Avatar
 
Join Date: Jun 2007
Location: Pgh, Pa
Posts: 476
Default

Use Walker Dynomax Super Turbos..

Open one up and you'll see why they are so much better then the other turbo mufflers..
Jeffs 64 is offline   Reply With Quote
Old 02-22-15, 06:43PM   #9
Mr.Pontiac
Registered User
 
Join Date: Feb 2003
Location: Weirton WV
Posts: 1,822
Default

Just ordered violator mufflers from pypes. I think these will work great for what im doing.
Mr.Pontiac is offline   Reply With Quote
Old 03-21-15, 04:17PM   #10
Mr.Pontiac
Registered User
 
Join Date: Feb 2003
Location: Weirton WV
Posts: 1,822
Default

New mufflers installed & getting ready!!
Attached Thumbnails
Click image for larger version

Name:	SANY1073.jpg
Views:	197
Size:	56.4 KB
ID:	27581  
Mr.Pontiac is offline   Reply With Quote
Old 04-09-17, 08:32PM   #11
Mr.Pontiac
Registered User
 
Join Date: Feb 2003
Location: Weirton WV
Posts: 1,822
Default

Gach, please remove from forums!!
Mr.Pontiac is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Race Cars.. Mufflers or Not Mark G ECM Heads up / Comedy Section 43 05-29-14 04:10PM
Considering New Mufflers LFSADRG Engine Tech Discussion - Street or Strip 11 10-24-09 12:01AM
Usa Oil Find turbo louie Grape Vine - General Discussion 5 03-15-09 01:22AM
409 stainless Mufflers GTOKID Parts & Cars For Sale & Wanted 0 03-10-09 09:17PM


All times are GMT -3. The time now is 11:02AM.

Featured Ads
Ken's Speed & Machine
Mayhem Turbocharging

Carter Cryogenics.  What can we freeze for you?

Pacific Performance Racing

Central Virginia Machine Service.  Home of the Injun Engine!

All Pontiac Engine Kits

Larry's Auto Machine.  Full serivce auto, marine machine shop, domestic and foreign.

Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
2001 - 2007 PontiacZone.com
Page generated in 0.11444 seconds with 38 queries