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post #1 of 14 Old 05-24-2009, 10:52 PM Thread Starter
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building a dart 331 need help

i want very low compression what heads should i run ever head i look at is like 60 cc i want a head that is in the 70 or 72 cc and what piston should i buy i want 20 to 25 lbs of boost and what crank is a good one to run i appreciate any advice i can get

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post #2 of 14 Old 05-24-2009, 11:03 PM
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your questions are very vague


i would talk to an experienced engine builder, tell them your plans and goals and go from there.


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post #3 of 14 Old 05-24-2009, 11:33 PM
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Why do you want very low compression? Its just gonna make it a turd before the boost. Personally I'm fine with it around 9:1 ish, but I definately wouldn't be going any lower than 8.5:1.

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post #4 of 14 Old 05-25-2009, 12:24 AM
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8.5:1 je piston's, oliver rods, and callies crank should do the trick, and a set of afr's for heads probably 205's would work nice.
are you looking to go twin turbo'd or single?
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post #5 of 14 Old 05-25-2009, 12:50 AM
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contact brian at AD Performance

if you are going to go Dart go 4.125" bore and get a 347 using 331 rod angle.
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post #6 of 14 Old 05-25-2009, 09:27 AM
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What size turbo is ideal for a 331? Would a 67mm be to small?

Stock block, GT40 heads, Explorer intake, 67mm, 10lbs, 431HP 497TQ on 110 octane. 12.01 @ 123
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post #7 of 14 Old 05-25-2009, 09:51 AM
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I would build a 4.125/3.25 engine with a 70cc chamber. You get good cubes and a strong piston design. I would build it around 8.5 to 1 if it's going to be a pump gas engine.

I think the large chamber with the smaller dish works better for flame propagation. Cars like the EVO/STI are like this and they were developed with OE engineering money.

You need to have a goal in order to works towards it. What do you want?

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post #8 of 14 Old 05-25-2009, 09:55 AM Thread Starter
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going single turbo already installed the turbo with low boost but having a hella time finding someone to tune it for me i removed a supercharger running 8 lbs of boost now it wont run right with the vaccum line hooked where i had them hooked for the supercharger wont idle or and misses
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post #9 of 14 Old 05-25-2009, 12:35 PM
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I would build a 4.125/3.25 engine with a 70cc chamber. You get good cubes and a strong piston design. I would build it around 8.5 to 1 if it's going to be a pump gas engine.

I think the large chamber with the smaller dish works better for flame propagation. Cars like the EVO/STI are like this and they were developed with OE engineering money.

You need to have a goal in order to works towards it. What do you want?

Jay Meagher
Mine is a 8.5:1 Dart 347 based on a 4.125" bore with a set of AFR185s it is a pump gas engine with a T76 turbo on it.

The goal is to run a streetable 650-700rwhp thru a Viper 6 speed and full road race suspension. Streat car of course, got have a/s & p/s.
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post #10 of 14 Old 05-25-2009, 11:18 PM Thread Starter
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my hp goal is 700 to 750 rwhp on pump gas i want 8.5:1 comp. dart block 20 lbs boost daily driver what are the parts i need to start buying pistons crank cam rods heads not rich so need to start buys little at a time thanks guys for any advice

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post #11 of 14 Old 05-26-2009, 12:35 AM
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my hp goal is 700 to 750 rwhp on pump gas i want 8.5:1 comp. dart block 20 lbs boost daily driver what are the parts i need to start buying pistons crank cam rods heads not rich so need to start buys little at a time thanks guys for any advice

You are probably better looking at what kind of funds you have first.
Here is a run down on what it has cost me so far.
Dart 4.125 347 AFR 185 long block assy. = $9500
Cam and valve springs = $700
Fuel system, lines and fittings = $3500
Clutch = $1000
BG Turbo, 76mm kit = $4200
AEM ECM, EPM & Coils = $2500
Misc motor parts (valve covers, oil pan, t/b, crankcase pump, battery relocation, radiator, t/s housing for -16an fittings, oil filter relocation kit, ARP bolts everywhere, etc) = $3000+
That is just $23,500 in motor does not include tranny or suspension and brakes that it takes to handle a 700rwhp car.
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post #12 of 14 Old 05-26-2009, 02:05 AM
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What parts have you already collected? I am not trying to be a jerk, but at that HP and boost level things tend to get expensive. After you drop the coin and time, race fuel is going to be cheap insurance.
700 rwhp on the street is a handful.
I have a 92 LX that in full street trim (a/c, AOD, power everything) runs 138 mph in the 1/4 on 12psi. The only place I can mat the throttle w/o endangering public safety is on a prepped track. I loved the car when it ran low 12's. Now, not so much.
Good luck in your build.
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post #13 of 14 Old 05-26-2009, 03:56 AM
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What parts have you already collected? I am not trying to be a jerk, but at that HP and boost level things tend to get expensive. After you drop the coin and time, race fuel is going to be cheap insurance.
700 rwhp on the street is a handful.
I have a 92 LX that in full street trim (a/c, AOD, power everything) runs 138 mph in the 1/4 on 12psi. The only place I can mat the throttle w/o endangering public safety is on a prepped track. I loved the car when it ran low 12's. Now, not so much.
Good luck in your build.
Funny you say that. I am contemplating buying a rolling chassis 94-2004, preferably one that already has all the cage/suspension work done and drop my motor, turbo, rear end, fuel system and electronics in. All I need is an automatic tranny. A track car with working lights for the street.

If I do I will put the factory Cobra motor back in the car I have now and enjoy it more probably. The Cobra now has T56 and full MM suspension.
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post #14 of 14 Old 05-26-2009, 08:24 AM
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Quote:
Originally Posted by Angry_Man View Post
What parts have you already collected? I am not trying to be a jerk, but at that HP and boost level things tend to get expensive. After you drop the coin and time, race fuel is going to be cheap insurance.
700 rwhp on the street is a handful.
I have a 92 LX that in full street trim (a/c, AOD, power everything) runs 138 mph in the 1/4 on 12psi. The only place I can mat the throttle w/o endangering public safety is on a prepped track. I loved the car when it ran low 12's. Now, not so much.
Good luck in your build.
Yikes! i hope my car don't become like that or i will be disappointed like you.

Dart 347, High Ports, FAST XFI, TH400, Precision 78GTS,E85, 836hp 714tq.
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