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Old 05-08-2014, 05:24 PM
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6-700hp 383 build suggestions

Hey everyone, names Jack and im new to the V8 scene I live in New Zealand and we're quite into our performance cars, most of which are Japa's tho. Im planning on putting a 383 sbc into an RX7 and need some help with the top half of the engine. So far I have a 350 bored 30 thou, forged crank, H beam rods and -22cc forged pistons. It'll be running on 98 octane pump gas. So heres what I need to know:

What cc heads? Will be aluminum but 180cc or 200cc?
What size blower? 6-71 or 8-71?
What Cam? Ive heard you dont need a crazy size with a blower
What size carbs? 650 or 750?
And lastly, why dont people use tunnel rams with blowers?

All help much appreciated! There will be no budget for this, want the best.

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Old 05-08-2014, 05:51 PM
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Quote:
Originally Posted by NZJacksonNZ View Post
Hey everyone, names Jack and im new to the V8 scene I live in New Zealand and we're quite into our performance cars, most of which are Japa's tho. Im planning on putting a 383 sbc into an RX7 and need some help with the top half of the engine. So far I have a 350 bored 30 thou, forged crank, H beam rods and -22cc forged pistons. It'll be running on 98 octane pump gas. So heres what I need to know:

What cc heads? Will be aluminum but 180cc or 200cc?
What size blower? 6-71 or 8-71?
What Cam? Ive heard you dont need a crazy size with a blower
What size carbs? 650 or 750?
And lastly, why dont people use tunnel rams with blowers?

All help much appreciated! There will be no budget for this, want the best.
No Budget?
Here you go
Nelson Racing Engines - Extreme Horsepower Twin Turbo Engines, Supercharged Engines, LSX Engines
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Old 05-08-2014, 07:29 PM
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Jesus that's some intense stuff! Seems like the cheaters way out tho. I want to build the engine myself
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Old 05-08-2014, 07:35 PM
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What year is the RX-7?
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Old 05-08-2014, 07:43 PM
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1998 S7. I've seen the conversion done before, only one in NZ tho.
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Old 05-08-2014, 08:07 PM
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Reason you don't use a tunnel ram with a blower is it doesn't help anything, and just makes things less reliable.

A Tunnel Ram's advantage is to get a small amount of "ram effect" to the air charge on a naturally aspirated engine, at a specific rpm range only....a blower is already supplying a bigger "ram effect" than the small amount the tunnel ram could find on it's own, so the point of it is moot, it doesn't help.

Bad is that you just put a heavy part(the blower) with spinning parts inside, up in the air higher on a weaker tall intake, and increased the length of the belt, which will be more prone to stretching and running off the pulleys the longer it is.

On your build.....with a blower forcing air in, 220cc heads would not be too big, 200 cc is on the small side, and 180cc is definitely too small. The 8-71 blower will make bigger power easier, with less added heat, and not have to be spun as fast to get that power. Two 750 or 850 carbs, not the 650's, you don't want any more restriction on the intake side than is necessary.

I'm assuming you'll be on Alky, like the Aussie's are??
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Old 05-08-2014, 08:17 PM
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Why a roots blower for this? Is this a "thing" where you live?
If that's what your deterimed to use
http://www.summitracing.com/int/part...1050/overview/
http://www.summitracing.com/int/part...04-8/overview/
http://www.summitracing.com/int/part...576s/overview/ (X2)
http://www.summitracing.com/int/part...482p/overview/
Get out the sawzall
1" 3/4 long tube headers minimum.
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Old 05-08-2014, 09:01 PM
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Something like this? (sbc with a smaller Weiand blower)



If you are making unlimited budget power, you might need to install a backhalf like this car...



The stock torsen rear is only good to around 450whp with traction, stronger 4 pinion clutch style '86-'88 T-II diff only gets it up to around 650.
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Old 05-08-2014, 09:06 PM
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Does your car have one of my subframes?...

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Old 05-08-2014, 09:37 PM
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Cheers for that guys, wont be running on alcohol, just 98 pump gas. I thought an 8-71 would be too big for a small block but if it can be spun alright then sweet. The whole car will be braced and i'll just use the factory diff until it blows. Car is wide body and currently has 335/30/18 tyres on the rear

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Old 05-08-2014, 09:40 PM
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Quote:
Originally Posted by aisr View Post
Does your car have one of my subframes?...

No I dont have one yet, there is a place in NZ called Racefab that make them for $900 if you send them the factory frame. How much is yours? Cheers
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Old 05-09-2014, 09:24 AM
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If your budget is good??? build a 472 small block or at least a 434 if you have to use a gen I sbc. Use the 245 cc intake runner AFR heads,2 x 850 holleys (or 950s) large tube headers at least 1 7/8 stepped to 2"(custom made) moderate hydraulic roller cam 230/236 on 112 x .575 lift

If you want serious power build a 440 LSX with "Mast" heads,same sort of parts with extreme head flow numbers. Tune it to 1,000 hp or less as desired.
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Old 05-09-2014, 04:17 PM
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V8s are quite uncommon in NZ, a 2nd hand ls1 is worth about 5-6 grand :/ A 454 block came up for sale but worried it would be too long for the car. 350s seem to fit in nicely so thought upsizing it to a 383 would be best. We have lots of crazy powerful skylines and evos, rotaries etc but yeah.. This'll be different haha
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Old 05-12-2014, 01:41 PM
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With no budget go with an aftermarket Aluminum block. Also go with a modern twin screw supercharger.
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Old 05-13-2014, 12:37 AM
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Quote:
Originally Posted by xxllmm4 View Post
With no budget go with an aftermarket Aluminum block. Also go with a modern twin screw supercharger.
Surly a cast 4 bolt mains would be strong enough?? Wouldnt know where to get an aluminum one unless it was an LS block. The stroker kit I have is also for the older 2 piece seal. Whats a "modern" charger? How do they differ form the old style ones?
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