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Turbo Charged - Precision Turbo & Engine

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Old 08-28-2019, 12:36 PM   #31
TurboII
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Default Re: turbo BBC engine builders

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Originally Posted by nob00st View Post
10sec_rx7 - thanks. good to know the crank I have is good enough for my goals.

Are you running steel rocker arms? I was thinking maybe aluminum intake, steel exhaust T&D or Jesel rockers? I already have a belt drive left over from my old engine.

For head studs, are you using the standard 7/16" or did you upgrade to 1/2"? Standard ARP 2000 or some exotic material?

I plan on running methanol. Looking at the new Aeromotive spur gear pump, what size would I need? 21.5 gpm? Planning on using Billet Atomizers, what size for 2500hp? 750#?

Want a little wiggle room/safety margin for both the pump and injectors.


Thanks guys!
I would just go ahead and run a single 800 or 850PPH and give yourself some room to grow. A 19gpm pump would be plenty but I would go 10gpm @ 4000rpm. This gives you room to grow up to 21-22gpm @ 5000rpm with only a pulley change. I have made ~2200rwhp on a 12.5gpm Waterman Lil' Bertha.

I am a Billet Atomizer dealer and give a YB Member discount. Definitely consider the -ORB style injectors I developed. They are the safest thing on the market and allow a lot of mounting flexibility. I offer in house manifold conversations, fully plumbed systems using premium crimp style line and fittings. Generally I use Earl's Ultraflex but can use any hose/fittings on the market that meet our safety goals.





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Old 09-10-2019, 12:03 AM   #32
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Default Re: turbo BBC engine builders

TurboII - thanks for all the help, i will for sure give you a ring when i am ready for those injectors!
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Old 09-18-2019, 02:27 PM   #33
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Default Re: turbo BBC engine builders

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Originally Posted by 10sec_rx7 View Post
i was running aluminium both intake and exhaust, i just got a set of steel for both intake and exhaust, have not done a pass with them yet, T&D brand,
I'd like your feedback on the steel vs aluminum after some testing, thanks.
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Old 09-18-2019, 08:32 PM   #34
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Default Re: turbo BBC engine builders

Steel is better period. Aluminum has a finite cycle life. Even if they were of adequate strength
when new once they reach their cycle limit you will start having failures. Steel doesn't have this issue. Very similar to steel vs aluminum rods. If you can't afford steel there are a couple options.

Option 1) Steel exhaust rockers are where they're most needed and has the most chance of breaking an aluminum rocker.

Option 2) The aluminum rockers are prone to break on the pushrod side of the fulcrum due to the shorter length and multiplication of spring pressure. You can increase the amount of material there by having them made with male adjusters that don't require the big recess needed to countersink the female adjuster. Then have the pushrods made with a female on that end. You will gain around 20-25% increase in strength in that area.

Hope this helps.
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Old 09-18-2019, 11:42 PM   #35
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Default Re: turbo BBC engine builders

Thanks for the response, TurboII.
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Old 09-19-2019, 07:34 AM   #36
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Default Re: turbo BBC engine builders

How come steel rockers are 3-4 times as much money? I dont understand why as it cant be that much more in material cost
Jesel pro alum 1600-1700. Steel is like 4-5 grand. Ridiculous imo
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