I have decided I am going to get a new inlet mani made up, I am running extra injectors so this is going to be the easiest and cheapest way for me to get them installed going with a 8 injector setup.

I have read a few threads and am aware that designing inlet manifold properly is a very complex process, I am not looking for perfection I just am after some pointers.
I will be using the stock flange and keeping the existing injectors where they are. from there back using aliminium. Can someone tell me what the best length runners would be, the best width and what kind of size plenum I should use?? I will get a throttle body off a old ford or something like that.

Any info is appreciated.
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I believe the Edelbrock manifold is set up for 8 injectors and you just have to drill out the four holes on the back side. That's probably going to be your best bet.

 

Nah its to costly for me I am only going to be spending around $200. ANyone got spec's from some of the sohc turbo mani's on the market?? I give you a e-beer

 

Ninjas??

 

I'll measure my STR box style manifold for you tomorrow

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by D-Man &raquo;</TD></TR><TR><TD CLASS="quote">I'll measure my STR box style manifold for you tomorrow </TD></TR></TABLE> As promised

 

OK,I took some measurements..The runner length not counting the injector flange is 4.5" and 2" round in outside diameter.The Box is 13"-14"* x 4" x 4"

*(its tapered back on the other side of the Throttle body,closest part to firewall is 13")

hope this helps

 

Thanks so the top so to speak is slight shorter then the bottom of the plenum ( where there runner come from? If I understand correctly? Is that mani made out of stainless or aliminum any reccomendations? I was goingto use aliminum I guess its easier to weld to the existing alloy flange..

Much appreciated

 

Your mani look like this?

 

Anyone know anything about these ugly looking suckers say's operating range is between 4500- 9000rpms... I am guessing just for all out race applications doesn't say whether its made for N/A or F/I....

 

Checkout the runners on this biznatch

9in long said to make peak power at high high rpm...

 

Yeah,Golden Eagle is the maker of the STR,its the same exact thing and make it in aluminum.That JG one uses a stock d manifold manifold flange and runners with a plenum welded onto the ends of the stock runners.

 

The Edelbrock manifold is going to provide you with a lower RPM powerband (more low torque, less high rpm power) than some of the sheet metal manifolds shown above it. This is due to its longer runners, and what looks like a smaller plenum.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kpt4321 &raquo;</TD></TR><TR><TD CLASS="quote">The Edelbrock manifold is going to provide you with a lower RPM powerband (more low torque, less high rpm power) than some of the sheet metal manifolds shown above it. This is due to its longer runners, and what looks like a smaller plenum.</TD></TR></TABLE>

yeah and your have to remember the Edelbrock is designed for the street and to work with its 200hp turbo kit.The GE is a race piece designed for more like 400hp.

 

Cheers, so I am thinking on going with a very similar design to the STR mani. I am not actually looking for massive power but in the future if I build the engine it may help out then.

 

I the manifold theory holds true for the D series, just like the B series, I would imagine the sheet metal manifolds with just over a 4" runner would still lose power ona 400 hp D series engine, just like the Victor X manifolds have shown to do.

I'd personally stick with one similar to the Edelbrock manifold, its still short runners than stock (3" shorter) and a larger than stock plenum!

 

does anyone have the dyno curve for that victor x?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Marauder &raquo;</TD></TR><TR><TD CLASS="quote">I the manifold theory holds true for the D series, just like the B series, I would imagine the sheet metal manifolds with just over a 4" runner would still lose power ona 400 hp D series engine, just like the Victor X manifolds have shown to do.</TD></TR></TABLE>

Kinda confusing post you got there,let me try to figure this out...are you comparing a B series Victor X vs a B Series sheetmetal,if so that is a bad example cause it's short runner vs short runner.To test the theory correctly you guys should go see if the Victor X loses power vs a longer runner manifold like a skunk2 or Type R then come back and tell me shorter runners lose power on high HP motors.....I bet it wont

 

Hey D-man I am thinking of going 1 3/4in runners the aliminium piping has a fairly thin sidewall, good idea? And I will most likely just use a round 4in tube for the plenum.. Condideringing getting a TB off a ford like 68mm big or should I just get one off a B16a or similar??

I am only looking for around 25owhp at the moment but may go for 350whp later on with rods and pistons

 

Up for more info

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by D-Man &raquo;</TD></TR><TR><TD CLASS="quote">Kinda confusing post you got there,let me try to figure this out...are you comparing a B series Victor X vs a B Series sheetmetal,if so that is a bad example cause it's short runner vs short runner.To test the theory correctly you guys should go see if the Victor X loses power vs a longer runner manifold like a skunk2 or Type R then come back and tell me shorter runners lose power on high HP motors.....I bet it wont
</TD></TR></TABLE>

I am saying that short runners don't work well on a B series. I will look up dyno comparisons, since I have seen a few on H-T. Runner length has more influence on what RPM range you are looking to run in, and the ChampCar engines I used to work on had about a 3" runner and reved to over 16000 rpm.

 

Regular b -series throttle or go bigger cause I can??

 

Come on what are you guys wanting to run??<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbozxi &raquo;</TD></TR><TR><TD CLASS="quote">Regular b -series throttle or go bigger cause I can??</TD></TR></TABLE>

 

I'd either use a Type-R 62mm throttle body, or a Edelbrock 65mm (4798).

 

Cheers