on a lift today
07-22-2007, 12:16 PM
#11
1st Gear Member
Join Date: Apr 2006
Location:
Posts: 91
RE: on a lift today
Maybe I am misunderstanding, but why do V8's HAVE to have an H pipe? If I am not mistaken, X pipes have been shown to be more efficient in our cars. Heck, I am running a Bassani X with no problems and I picked up about 10 HP making the switch.
07-22-2007, 03:24 PM
#15
I ♥ Acer
Join Date: May 2007
Location: Florida
Posts: 1,786
RE: on a lift today
ORIGINAL: ZZmustang
V8s have to have a H pipe, because of the firing order,2 cylinders on the same side fire right after each other, this would make to much back pressure unless relieved by the H.
Example; Chevy small block has on the left side if you were standing in front of the engine, Pistons number 2-4-6-8 and on the other side 1-3-5-7
The firing order is 1-8-4-3-6-5-7-2, This means that 5-7 and 8-4 right after each other, without the H the exhaust from the second piston firing would have a hard time exiting.
V8s have to have a H pipe, because of the firing order,2 cylinders on the same side fire right after each other, this would make to much back pressure unless relieved by the H.
Example; Chevy small block has on the left side if you were standing in front of the engine, Pistons number 2-4-6-8 and on the other side 1-3-5-7
The firing order is 1-8-4-3-6-5-7-2, This means that 5-7 and 8-4 right after each other, without the H the exhaust from the second piston firing would have a hard time exiting.
07-22-2007, 03:27 PM
#16
I ♥ Acer
Join Date: May 2007
Location: Florida
Posts: 1,786
RE: on a lift today
ORIGINAL: lldsandsll
thanks guys! 298 did seem high. i had it done at VMP. he said it must be the axleback, no mufflers. it's funny, it was around 100 degrees when tuning too, with humidity ranging between 15 and 20 percent. you'd think that would drag it downsome.there was a thread on here where i posted the dyno sheet, so i sh*t you not (operative word being i).
thanks guys! 298 did seem high. i had it done at VMP. he said it must be the axleback, no mufflers. it's funny, it was around 100 degrees when tuning too, with humidity ranging between 15 and 20 percent. you'd think that would drag it downsome.there was a thread on here where i posted the dyno sheet, so i sh*t you not (operative word being i).
regardless, nice numbers...
07-22-2007, 03:27 PM
#17
4th Gear Member
Join Date: May 2006
Location: Fort Mcmurray, Ab
Posts: 1,126
RE: on a lift today
ORIGINAL: s197richie
um, if this is true, how do you explain the y-pipe-to-single-pipe system used by all 1982-2002 fbodies, as well as 79-85 foxes (and probably quite a few before that, I'm not sure)...
ORIGINAL: ZZmustang
V8s have to have a H pipe, because of the firing order,2 cylinders on the same side fire right after each other, this would make to much back pressure unless relieved by the H.
Example; Chevy small block has on the left side if you were standing in front of the engine, Pistons number 2-4-6-8 and on the other side 1-3-5-7
The firing order is 1-8-4-3-6-5-7-2, This means that 5-7 and 8-4 right after each other, without the H the exhaust from the second piston firing would have a hard time exiting.
V8s have to have a H pipe, because of the firing order,2 cylinders on the same side fire right after each other, this would make to much back pressure unless relieved by the H.
Example; Chevy small block has on the left side if you were standing in front of the engine, Pistons number 2-4-6-8 and on the other side 1-3-5-7
The firing order is 1-8-4-3-6-5-7-2, This means that 5-7 and 8-4 right after each other, without the H the exhaust from the second piston firing would have a hard time exiting.
07-22-2007, 03:36 PM
#18
I ♥ Acer
Join Date: May 2007
Location: Florida
Posts: 1,786
RE: on a lift today
ORIGINAL: explict
I guess y-pipe fall under the same catagory as a h or x pipe in a way. The exhaust gases still mix in the system. But he was also wrong in that they HAVE to have a h pipe because they can also have x-pipes and Open headers!
ORIGINAL: s197richie
um, if this is true, how do you explain the y-pipe-to-single-pipe system used by all 1982-2002 fbodies, as well as 79-85 foxes (and probably quite a few before that, I'm not sure)...
ORIGINAL: ZZmustang
V8s have to have a H pipe, because of the firing order,2 cylinders on the same side fire right after each other, this would make to much back pressure unless relieved by the H.
Example; Chevy small block has on the left side if you were standing in front of the engine, Pistons number 2-4-6-8 and on the other side 1-3-5-7
The firing order is 1-8-4-3-6-5-7-2, This means that 5-7 and 8-4 right after each other, without the H the exhaust from the second piston firing would have a hard time exiting.
V8s have to have a H pipe, because of the firing order,2 cylinders on the same side fire right after each other, this would make to much back pressure unless relieved by the H.
Example; Chevy small block has on the left side if you were standing in front of the engine, Pistons number 2-4-6-8 and on the other side 1-3-5-7
The firing order is 1-8-4-3-6-5-7-2, This means that 5-7 and 8-4 right after each other, without the H the exhaust from the second piston firing would have a hard time exiting.
07-22-2007, 03:40 PM
#20
2nd Gear Member
Join Date: Jan 2007
Location: Plant City FL
Posts: 403
RE: on a lift today
ORIGINAL: lldsandsll
i got to see the underside of my car today. i thought the stock mid section was straight pipes. i got my car slightly used. i noticed in my mid section the pipes we're connected by another pipe, ie, i had an H-pipe. is this the stock setup? i could have sworn it was straight pipes. anyway, that would explain why that, combined w/ the MBRP's sounds so mean. that would also explain whyi got 298rwhp on the dyno w/ my only other mod being a JLT intake.
i got to see the underside of my car today. i thought the stock mid section was straight pipes. i got my car slightly used. i noticed in my mid section the pipes we're connected by another pipe, ie, i had an H-pipe. is this the stock setup? i could have sworn it was straight pipes. anyway, that would explain why that, combined w/ the MBRP's sounds so mean. that would also explain whyi got 298rwhp on the dyno w/ my only other mod being a JLT intake.
Oh and your dyno numbers make me sick. I think I told you that last week in Orlando [X(]