needing a factory 'Y' pipe? look what I found

[River Beast]

www.carparts.com (http://www.carparts.com) has them to order and shipped within 7-10 business days

Here are two examples:

80 W/T-------YM7527------$94.18
78 Wagoneer--YM5513------$108.38

Jsut thought I would pass this find on... ;)

[243]

Todd~

You DO know that you have to have a dual 3" system with headers to make power :D

Incidently, my local parts store can get the y-pipe through Walker.

[ September 24, 2002, 04:33 PM: Message edited by: 243 ]

[Rogue]

You DO know that you have to have a dual 3" system with headers to make power :D
dont start that again LOL tongue.gif

[ September 24, 2002, 05:05 PM: Message edited by: RogueStar ]

[Panoscopic]

Its not the power its the torque......

[Bombadier]

roughly how much extra power can you get from going from factory Y-pipe to dual straights?

[Stuka]

dont go dual straights...at least put on a glass pack or something..you NEED back pressure..no backpressure is only goood if your running high rpm's...which 360's dont do. If you want mostly low end go with a single 2.5", if you want better flow in mid to higher rpm's go with dual 2.25".

[KYJ10]

I just finished my exhast today. I picked up a 360 donor for my J10. It had headers on it , so I used them. I ran dual 3" pipes just past the tcase, then made up a bent piece that kinda does about a 70 degree turn up over the rear drive shaft, then turns back down and Y'ed into the other side. Then single 3" into my flowmaster. Would have never been able to make it fit without the body lift! It seems to run really well. Im used to the 258 and what a difference the 360 swap has made. With a locker, 456 gears and 35's, I can fishtail up to 4th gear with just a slight punch of the gas. The 258 would'nt do it in 1st!. Oh well, time to update my profile. Dennis

[ September 24, 2002, 07:41 PM: Message edited by: KYJ10 ]

[243]

tongue.gif

[Bob Barry]

I've also been able to get Walker pipes through my local Advance Auto store. They have to order it, but it's just a day or two. The earlier (up to '79) Y-pipe is actually two pieces, which add up to just over $100.

[River Beast]

they are the prices for Walker thru www.carparts.com. (http://www.carparts.com.)

Originally posted by 243:
Todd~

You DO know that you have to have a dual 3" system with headers to make power :D

Incidently, my local parts store can get the y-pipe through Walker.Not this again!!!!! ROTFLMAO!!!!!

UGH!!!!!!

[reddog]

Originally posted by KYJ10:
I just finished my exhast today. I picked up a 360 donor for my J10. It had headers on it , so I used them. I ran dual 3" pipes just past the tcase, then made up a bent piece that kinda does about a 70 degree turn up over the rear drive shaft, then turns back down and Y'ed into the other side. Then single 3" into my flowmaster. Would have never been able to make it fit without the body lift! It seems to run really well. Im used to the 258 and what a difference the 360 swap has made. With a locker, 456 gears and 35's, I can fishtail up to 4th gear with just a slight punch of the gas. The 258 would'nt do it in 1st!. Oh well, time to update my profile. DennisSEE!! Larger exhaust DOES make more power!!!!

:D :D :D :D

Kerry

[porchpiggy]

FWIW, if anybody wants part numbers for the y pipe:
Carquest numbers: 80 to 91 449926, 78 to 79 w/converter 459933, 75 to 78 wo/converter 449901.
Walker numbers: 81 to 91 40407, 80 is 41965, and 74 to 79 is two piece 43630/44571.

[tuck]

Originally posted by reddog:
[QUOTE]SEE!! Larger exhaust DOES make more power!!!!

:D :D :D :D

Kerrysmaller exhaust makes more power too, when you mix more motor into the equation. :D there's no replacement for displacement, just ask those toyota guys. :D

[TexasJ10]

It looks like JC Whitney came through again. I wonder what their exact affiliation with carparts.com is?

[FSJeeper]

[/qb][/QUOTE]Not this again!!!!! ROTFLMAO!!!!!

UGH!!!!!![/QB][/QUOTE]

lol

The exhaust system is a balancing act. Depends on what mods are made to your engine, the effective operting rpm range, displacement, etc, etc, etc.

In general, and at lower rpms which would be up to about 2400 rpms for a stock 360, the more restrictive exhaust system will make more torque in this range. As the rpms rise and get into your peak HP range, which would be about 4000 rpms for a stock 360, the restictive exhaust system will hurt power and the less restrictive exhaust system will make more power that would have otherwise hurt low end torque.

The trick is to design your exhaust system to perform where you want it to balanced with the rest of your engine components.

It is possible to overscavenge your exhaust gasses to the point where you are sucking unburnt fuel pass the exhaust valve. Drag racers do this on purpose to help cool the exhaust valves but on a 4x4 all it would do is hurt performance and efficiency.

Anyone disagree? tongue.gif

[Rogue]

It is possible to overscavenge your exhaust gasses to the point where you are sucking unburnt fuel pass the exhaust valve. Drag racers do this on purpose to help cool the exhaust valves but on a 4x4 all it would do is hurt performance and efficiency.buy a cam with less overlap problem solved

[Lindel]

you can still over-scavenge, even with the best cam made.

FSJeeper has the best explanation going, so far, and I for one, say thanks!

BTW, you making the run to Barnwell, next month, FSJeeper?

[KYJ10]

I dont know about back pressure and high and low rpm setups for exhast, all I know is with my setup, I have power all around. I got into some deep ruts full of mud today. With the 258 I would have to be in 4L or would burn out the clutch to get out. I had it in 4H and was spinning and throwing mud everywhere. No problem. On the road, I can mash it and it jumps up and moves. So Im real happy. Dennis

[ September 25, 2002, 08:13 PM: Message edited by: KYJ10 ]

[FSJeeper]

I am going to be there hopefully if my FSJ is running, if not, I may be thee with other FSJ friends.

[Rogue]

Originally posted by Lindel:
you can still over-scavenge, even with the best cam made.i guess i must be stupid explain to me exactly how if you shorten the duration of overlap or in layman's terms shorten the amount of time that the intake and exhaust valves are open at the same time how you can overscavenge? that makes absolutly no sense whatsoever! if you got two garden hoses both going into a 5 gallon bucket and they both flow the same amount of water and you turn one on for 1 minute and the other on for 2 minutes which bucket is going to be fuller? you can lead a horse to water but you cant make him drink....

[243]

Haha tongue.gif

[FSJeeper]

Rogue,

Help me out here. Why would you want to spend money for a custom backwards split duration cam no one makes to compensate for an exhaust system that over scavenges?

The best all around cams are split duration cams and do exactly the opposite of what you propose, that is they keep the exhaust open longer than the intake. These cams are common and everyone makes them.

So putting more charge in the intake side and limiting the exhaust side is going to help performance?

I don't get it?

[Rogue]

why would anyone want to spend money on an overly efficient exhaust system?
dont put words in my mouth i said nothing about buying an exotic high dollar camshaft, OVERLAP is determinded by LOBE SEPARATION ANGLE only a high dollar high lift long duration high rpm racing camshaft would have attributes like your talking about. a camshaft with little overlap can be easily had - it would be most any cam with a smooth idle such as a stock cam or RV cam which last i checked are readily availible from a multitude of vendors, i dont know where you got this weird idea of backwards split custom whatever but you must be smoking some good stuff

[FSJeeper]

Cool, a lively post again!

I have read the post again and I swear I am not stoned. Let me try again.

A stock cam or mild RV cam is going to overscavenge BIGTIME with a maximum flow exhaust system and LOOSE low end torque and and possibly power in the entire rpm range. Even if the cam has less overlap. As you get into the higher lift/duration cams the proposed maximum flow exhaust system will then begin to make power at higher rpms but not in the lower rpm ranges.

You are basically proposing I run a very mild cam with less overlap and I can run the highest flow exhuast system imaginable and make power and torque throughout the entire torque and HP bands.

Sorry, I disagree.

[Rogue]

Originally posted by FSJeeper:
Cool, a lively post again!well im glad you took it in stride smile.gif i was only meaning to offer a suggestion in the first place but heck yea a lively debate!!! we have tons of very smart people here and i love a good debate. so ok lets start at the beginning - i agree with everything you said about a proper exhaust is a balancing act and that you can overscavenge - this is all true. but once again dont put words in my mouth i never claimed that a cam with less overlap would make more or less power just and only just that it would minimize scavenging but back to what you last said - according to what you're saying if i put a higher flowing exhaust system on a stock engine i will not make any more horsepower or torque anywhere in the rpm range - man you gotta be stoned!!!LOL and if we want to get real scientific here even the best designed exhaust system will still only be most efficient within a certain rpm range - as stated in previous post about single vs duals its all about sound waves and the length of them - when all these sound waves are in "harmony" is what would be "tuned" and they can only be tuned by length and diameter of pipe therefore any given system based on its length and diameter will only be tuned to work most efficiently within a certain rpm range so the end result is this: even if you had an overly efficient exhaust system it would only be overly efficient within a certain rpm range which can be further enhanced with camshaft selection which is why places like edelbrock sell their systems in 'sets' because they had already been engineered to work together, and yes you are right i personally wouldnt buy a camshaft to negate the effects of an exhaust system i would have bought an exhaust system that matched the needs of my camshaft/engine combination. tongue.gif ;)

[FSJeeper]

I am glad to you came around to my way of thinking. ROTFLMAO! tongue.gif tongue.gif tongue.gif

But you still are not there yet. And I am willing to accept that I am wrong if you prove it to me.

Based on your theory a stock 360 would make extra power somewhere in the power range with the most efficient exhaust possible. Lets say you ran your engine with no exhaust system at all. Open exhaust ports. I do not think the stock cam, heads, fuel delivery system, etc., etc., is capable of generating enough rpms to get to the point the open exhaust system would actually increase HP.

The end result in this situation would be fried exhaust valves from the most effective scavenging possible and if you really pushed it, the crapola AMC V-8 oiling system is going to starve number 7 and 8 rod bearings and you will sling the rods out the side of the block.

In theory, I totally agree with you, but in practice the AMC V-8 would never have the grunt to get anywhere close to be able to make more power anywhere from the use of the open exhaust ports.

[Big Daddy aka.redwoodsignman]

Wow just put 2.5" all the way from the y to the tail with a high flow muffler. I've got tork and hp to boot but the best part is when I hit the starter and it starts to rumble my son says cool.
It must be cool he's twelve and he knows everything.