4.0SOHC BLOWER!!! AND MORE MODS!?

[DrAgMaStA]

I kno what your saying about the headers, i know the engine needs a certain amount of hp, i have dynomax which has the least amount of back pressure. But my ? is what about the headers with the x-pipe with no cats, cuz the x-pipe equilizes back pressure, when i think should level off for accel dont you think. And for the 92 4.0l question, 4500 sounds about correct because the old 4.0l push rod with the 160hp was only designed for really torque output not reallt accel so it has a short shift point in first gear, atleast this is the info i was aware of....

 

[Agent_51]

Originally posted by DrAgMaStA
I kno what your saying about the headers, i know the engine needs a certain amount of hp, i have dynomax which has the least amount of back pressure. But my ? is what about the headers with the x-pipe with no cats, cuz the x-pipe equilizes back pressure, when i think should level off for accel dont you think. And for the 92 4.0l question, 4500 sounds about correct because the old 4.0l push rod with the 160hp was only designed for really torque output not reallt accel so it has a short shift point in first gear, atleast this is the info i was aware of....

Off topic, but jesus you type like a two year old. Two words for you. ENGLISH and PROOFREAD.

 

[JDraper]

Originally posted by Jason_25


Yeah definitely couldn't get much HP from a 302.......

Actually, you can get serious HP from a 302 if you build it up right. The 302 is a pretty sturdy platform to work from. I built up a 302 4-bolt motor for my '65 Mustang that was putting out over 400 HP normally aspirated. It just takes time and money.

 

[Klowns]

As far as the pipe being a different size on the Manifold. Is the fact that the ports are actually only as big as te smallest pipe that is on there.

 

[Jason_25]

Originally posted by JDraper


Actually, you can get serious HP from a 302 if you build it up right. The 302 is a pretty sturdy platform to work from. I built up a 302 4-bolt motor for my '65 Mustang that was putting out over 400 HP normally aspirated. It just takes time and money.

Jeff,

I was being sarcastic with the guy! I know a 302 is a great platform for building up.

 

[SteveVB]

Klowns

That manifold looks good. Does that mount on the drivers side? Any more info on your turbo plans.

The manifold looks good- any reason you didnt use a one piece flange? With that material thickness you may need a machine shop to mill one - unless you have a large plasma avail. I think it would be easier to keep the flange flat and aligned with a single piece- any problems you can get it milled to restore flatness- should also take some stress off the welded joints at the log as everything moves around during heating/cooling cycles. I think you are asking for trouble with the seperate flanges.
Looks Good. Im interested in your progress- this posted someplace else?

Hey Doug will the flat top poistons for the sohc fit into the OHV for comp increase? Just curious.

 

[Doug904]

Yes, the SOHC pistons will fit in a OHV block BUT they will raise the compression ratio up to around 12.5-13:1. WAY to high for any street and most track driven 4.0's. And thats using the 93Tm heads with the larger combustion chambers . Doug904.

 

[SteveVB]

Thanks Doug, yep a bit high.

 

[yob_yeknom]

Originally posted by DrAgMaStA
I kno what your saying about the headers, i know the engine needs a certain amount of hp, i have dynomax which has the least amount of back pressure. But my ? is what about the headers with the x-pipe with no cats, cuz the x-pipe equilizes back pressure, when i think should level off for accel dont you think.

You've got it all wrong. The engine needs a certain amount of back pressure to produce more torque at low rpms. It has to do with the vaccuum effect caused by the exhaust, and the lowest point of pressure in the exhaust system. Without enough backpressure, it screws that all up.
An X pipe is only useful on true dual exhaust systems (each bank of the engine has it's own exhaust system that never merges with the other) and does absolutely nothing for a non-true dual exhaust (pipes come together somewhere) vehicle. And all it does is equalize the backpressure for each side so they each flow the same.

So to answer your question:
headers - will hurt your torque by lowering backpressure
no cats - stupidest thing you can do, cuts a huge amount of backpressure and will confuse the O2 sensors located after them resulting in a poor running engine, absolutely no benefit at all from removing the cats
X pipe - useless for your application

 

[410Fortune]

Except in a BOOSTED application then the headers/high flow exhaust will HELP and not hurt......

 

[yob_yeknom]

Yes, that explanation for headers was for a normally aspirated engine. Once you change to a forced induction (supercharger/ turbo) there is a need for more flow, due to the greater volume of air being 'inhaled' into the engine there needs to be more room to 'exhale'.

The part about the removing the cats is still true. The part about the x-pipe is also still true.

 

[Alec]

Thanks John, some people just don't listen to me

 

[Klowns]

Re: Klowns

Originally posted by SteveVB
That manifold looks good. Does that mount on the drivers side? Any more info on your turbo plans.

The manifold looks good- any reason you didnt use a one piece flange? With that material thickness you may need a machine shop to mill one - unless you have a large plasma avail. I think it would be easier to keep the flange flat and aligned with a single piece- any problems you can get it milled to restore flatness- should also take some stress off the welded joints at the log as everything moves around during heating/cooling cycles. I think you are asking for trouble with the seperate flanges.
Looks Good. Im interested in your progress- this posted someplace else?

Hey Doug will the flat top poistons for the sohc fit into the OHV for comp increase? Just curious.

The manifold is made out of 304 stainless not soft steel like most, it'll handle high temperatures and the manifold was built on a +- .005 ground table. Each surface is the same as the next, they've also been reground for any expansion and contraction caused by tig welding.

 

[Klowns]

Originally posted by morrisey0
Aren't headers supposed to have equal lentgh pipes before combining? Those headers in that pic just look like a home made manifold.

Robb

Re posting....


For race applications, "naturally aspirated" and vehicles exceeding 600hp they use an all same length exhuast manifold. But, since this will not be exceeding 600hp, and, this kit is designed for bold on applications, not modified applications to the vehicle to make it fit.

i.e. Cutting out fender walls to make manifold and turbo fit properly.

 

[Jason_25]

Klowns,

so this is designed to literally bolt-up without moving stuff around near the exhaust?

Of course, the intake probably has to be modified but that's a given.

 

[Klowns]

Originally posted by Jason_25
Klowns,

so this is designed to literally bolt-up without moving stuff around near the exhaust?

Of course, the intake probably has to be modified but that's a given.

It's a full kit. It's all that you need to bolt on A turbo from the exhuast to the intake, excluding blowoff valve and heat exchangers, pump, tubing for the intercooler and oil and water lines.

 

[SteveVB]

Re: Re: Klowns

Originally posted by Klowns



The manifold is made out of 304 stainless not soft steel like most, it'll handle high temperatures and the manifold was built on a +- .005 ground table. Each surface is the same as the next, they've also been reground for any expansion and contraction caused by tig welding.

Stainless GOOD , the manifold looks good. I hope you are right about the separate flanges- Ive had really bad luck with them. Really interested in your progress keep us posted.
What is the turbo combo you are planning on running? cartridge,turbine, compressor. Single or dual turbo mounted where?

Thanks

 

[crashwave]

Wow this sounds like an amazing project. Keep us all updated! Pics too =)

 

[X24]

Dead Link Removed

 

[DrAgMaStA]

Well what im going to do is go with the blower, then NOS the *****, should get over 400hp there (90hp 8psi blower tuned) (75hp shot nos) then i'll get the headers, put in the x-pipe cuz like u said it will hurt, not help acell at this point. Dunno if it'll actually get over 400 but when i finish wit everything i'll get it dynoed and let everyone know. Oh BTW n e 1 know where to get saleen parts for a 98 X? Do they make them, cuz i saw pics and i want the skirts, air damn and door scoops that the saleen has 2 offer??? Where can i get em?