exhaust??????????????????

tinner · 12-10-2001, 07:32 PM

i am getting exhaust put on my 65 fastback . the car will soon have a small block stroker motor that will put out around 400 to 450 hp. im going load mybe 1 or 2 chamber flows and a h pipe . my question is what size pipes do i go w/ the collector on my long tubes are 3"????????

p.s. has any one put single camber flow masters on there car will they even take 450 hp?????????

thanks,
tinner

7DMACH1 · 12-10-2001, 07:40 PM

I have a 408c stroker in my 70 Mach with 2 chamber flowmasters and 3" pipes. It was dynoed at 537 HP at 6300 RPM. RAY

tinner · 12-11-2001, 10:11 PM

nice numbers did you biuld it your self ?

7DMACH1 · 12-11-2001, 10:30 PM

No I had an engine builder build it for me. He dialed it all in on the Dyno. Runs nice 2.78 first gear 4 spd and 4.33 rear. Solid roller cam 244 @ 50 and 6.23 lift. 11-1 comp. 800cfm double pumper. RAY

Fostang · 12-12-2001, 01:26 AM

I'd go 2.5 inches. If your going to be doing some street driving. Or 3 if its track only. 2 chambers are fine 1 chamber is to obnoxious.

Rev · 12-12-2001, 06:38 PM

My '66 is pretty loud even with 3 chamber Flowmasters. Tri-Y headers and custom 2 1/2" pipes make the rest of the exhaust system. My car is 99% street and 1% track. I don't think I could stand it any louder.

Rev

6T9PONY · 12-12-2001, 10:59 PM

I have Hedman headers......2 1/2 inch pipe.....and Thrush glasspacks......and it's very loud.......lol......but I love it!! I'm also 17 and am very obnoxious!

tinner · 12-12-2001, 11:29 PM

hey guys thanks for fast replys . i got it done today 2.5" w/ 2 camber flows sounds great but any ideas on why it back fires when i let of the gas what causes this ??????????????????

shovelnose · 12-13-2001, 01:00 AM

If it's mild backfiring that might be ok. Your new exhaust has little back pressure and scavenges the cylinder better. This can pull raw air/fuel mixture in the exhaust on de-cel under load. This will cause mild backfiring. If it's loud then that's not good.

You might want to check for vacuum leaks. I had a tear in my brake booster diaphram. The thing sounded like a gunshot on de-cel.

Do you have tail pipes? Any droning?

mustangman65_79 · 12-13-2001, 01:04 AM

Mine used to do this, I tracked it down to two things. One, and most likely it, was the carb. I found out that it was the wrong size and let too much air bypass under the carb. I fixed my stock carb, bought new gaskets, and tuned it, also replaced the pcv valve, yess, you still need it for your vave covers. The other thing was the fact the I just put in new Cherry Bombs and think that the unburnt gas stays in the muffer. It makes a really nice big flame out of the tip, I got a two - three foot flame out of mine.

tinner · 12-13-2001, 08:31 PM

there has to be something wrong it does it even when in park w/ little gas i let off and pop pop pop pop pop . i'll look for vac leaks thanks . the carb is new and i have not had any problem w/ that before the heeders and exaust

12-10-2001, 07:32 PM	#1
tinner Registered Member Join Date: Nov 2001 Location: santa rosa ca. Posts: 121	exhaust?????????????????? i am getting exhaust put on my 65 fastback . the car will soon have a small block stroker motor that will put out around 400 to 450 hp. im going load mybe 1 or 2 chamber flows and a h pipe . my question is what size pipes do i go w/ the collector on my long tubes are 3"???????? p.s. has any one put single camber flow masters on there car will they even take 450 hp????????? thanks, tinner

12-10-2001, 07:40 PM	#2
7DMACH1 Registered Member Join Date: Nov 2001 Location: PHILA. PA USA Posts: 469	I have a 408c stroker in my 70 Mach with 2 chamber flowmasters and 3" pipes. It was dynoed at 537 HP at 6300 RPM. RAY __________________ Your Way Network VIDEOS www.yourwayvideo.com

12-11-2001, 10:30 PM	#4
7DMACH1 Registered Member Join Date: Nov 2001 Location: PHILA. PA USA Posts: 469	No I had an engine builder build it for me. He dialed it all in on the Dyno. Runs nice 2.78 first gear 4 spd and 4.33 rear. Solid roller cam 244 @ 50 and 6.23 lift. 11-1 comp. 800cfm double pumper. RAY __________________ Your Way Network VIDEOS www.yourwayvideo.com

12-12-2001, 01:26 AM	#5
Fostang Registered Member Join Date: Feb 2001 Location: Stockton, Ca Posts: 599	I'd go 2.5 inches. If your going to be doing some street driving. Or 3 if its track only. 2 chambers are fine 1 chamber is to obnoxious. __________________ 67' Fastback-Supercharged 4.6 DOHC Cobra, T-56, 8.8 more to come. 67' Coupe-EFI, AOD, 8.8 90 Gt-Supercharged,MAF,TB,1.7's ripper, bassani x, 3.55's, 01' cobras, headers. 89'GT-Supercharged,Heads,Cam,Intake,TB,MAF,power pipe,headers,offroad exhaust,black bullits.

12-12-2001, 06:38 PM	#6
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	My '66 is pretty loud even with 3 chamber Flowmasters. Tri-Y headers and custom 2 1/2" pipes make the rest of the exhaust system. My car is 99% street and 1% track. I don't think I could stand it any louder. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

12-11-2001, 10:11 PM	#3
tinner Registered Member Join Date: Nov 2001 Location: santa rosa ca. Posts: 121	nice numbers did you biuld it your self ?

12-12-2001, 10:59 PM	#7
6T9PONY All about the Windsor. Join Date: Feb 2000 Posts: 2,052	I have Hedman headers......2 1/2 inch pipe.....and Thrush glasspacks......and it's very loud.......lol......but I love it!! I'm also 17 and am very obnoxious!

12-12-2001, 11:29 PM	#8
tinner Registered Member Join Date: Nov 2001 Location: santa rosa ca. Posts: 121	hey guys thanks for fast replys . i got it done today 2.5" w/ 2 camber flows sounds great but any ideas on why it back fires when i let of the gas what causes this ??????????????????

12-13-2001, 01:00 AM	#9
shovelnose Registered Member Join Date: Oct 2000 Location: Ontario, Canada Posts: 234	If it's mild backfiring that might be ok. Your new exhaust has little back pressure and scavenges the cylinder better. This can pull raw air/fuel mixture in the exhaust on de-cel under load. This will cause mild backfiring. If it's loud then that's not good. You might want to check for vacuum leaks. I had a tear in my brake booster diaphram. The thing sounded like a gunshot on de-cel. Do you have tail pipes? Any droning? __________________ 82 Mercury Capri 302, Comp. Cams, Tremec 3550, 3.73's, 12.8@106 N/A Kevin's Capri Kevin's Mustang

12-13-2001, 01:04 AM	#10
mustangman65_79 My poor 79 RIP Join Date: Oct 2001 Location: Suisun City, Posts: 2,320	Mine used to do this, I tracked it down to two things. One, and most likely it, was the carb. I found out that it was the wrong size and let too much air bypass under the carb. I fixed my stock carb, bought new gaskets, and tuned it, also replaced the pcv valve, yess, you still need it for your vave covers. The other thing was the fact the I just put in new Cherry Bombs and think that the unburnt gas stays in the muffer. It makes a really nice big flame out of the tip, I got a two - three foot flame out of mine. __________________ '84 mustang GT turbo '85 LTD '89 Camaro Irocz z28 '94 Lightning '96 Trans am

12-13-2001, 08:31 PM	#11
tinner Registered Member Join Date: Nov 2001 Location: santa rosa ca. Posts: 121	there has to be something wrong it does it even when in park w/ little gas i let off and pop pop pop pop pop . i'll look for vac leaks thanks . the carb is new and i have not had any problem w/ that before the heeders and exaust

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